Great research starts with great data.

Learn More
More >
Patent Analysis of

Blue phosphorescence compound and organic light emitting diode comprising the same

Updated Time 12 June 2019

Patent Registration Data

Publication Number

US10153440

Application Number

US13/966021

Application Date

13 August 2013

Publication Date

11 December 2018

Current Assignee

LG DISPLAY CO., LTD.

Original Assignee (Applicant)

LG DISPLAY CO., LTD.

International Classification

H01L51/00,C09K11/06,H05B33/14,H01L51/50

Cooperative Classification

H01L51/0085,C09K11/06,H05B33/14,C09K2211/1007,C09K2211/1029

Inventor

LEE, SEUNGJAE,SHIN, INAE,HEO, HYERYOUNG

Patent Images

This patent contains figures and images illustrating the invention and its embodiment.

US10153440 Blue phosphorescence compound organic 1 US10153440 Blue phosphorescence compound organic 2 US10153440 Blue phosphorescence compound organic 3
See all images <>

Abstract

A blue phosphorescence compound is disclosed. The blue phosphorescence compound represented by Chemical Formula 1 below.

Read more

Claims

1. A blue phosphorescence compound represented by any one of Chemical Formulas below:

2. An organic light emitting diode having an organic film formed between an anode and a cathode, the organic light emitting diode comprising the compound of claim 1.

3. The organic light emitting diode of claim 2, wherein the organic film is a light emitting layer.

4. The organic light emitting diode of claim 3, wherein the compound is used as a dopant of the light emitting layer.

5. The organic light emitting diode of claim 3, wherein the dopant is doped at a weight ratio of 0.1 to 50% with respect to the light emitting layer.

6. The organic light emitting diode of claim 5, wherein the dopant is doped at a weight ratio of 1 to 20% with respect to the light emitting layer.

7. The organic light emitting diode of claim 2, further comprising any one selected from a hole injection layer, a hole transport layer, an electron transport layer, and an electron injection layer.

Read more

Claim Tree

  • 1
    1. A blue phosphorescence compound represented by any one of Chemical Formulas below:
  • 2
    2. An organic light emitting diode having
    • an organic film formed between an anode and a cathode, the organic light emitting diode comprising the compound of claim 1.
    • 3. The organic light emitting diode of claim 2, wherein
      • the organic film is a light emitting layer.
    • 7. The organic light emitting diode of claim 2, further comprising
      • any one selected from a hole injection layer, a hole transport layer, an electron transport layer, and an electron injection layer.
See all independent claims <>

Description

This application claims the priority benefit of Korean Patent Application No. 10-2012-0147732 filed on Dec. 17, 2012, which is incorporated herein by reference for all purposes as if fully set forth herein.

BACKGROUND

Field of the Disclosure

Embodiments of the disclosure relate to an organic light emitting diode, and more particularly, to an organic light emitting diode comprising a new blue phosphorescence compound.

Discussion of the Related Art

Recently, flat panel displays (FPDs) have grown in importance together with the development of the multimedia. Correspondingly to this trend, several kinds of displays, such as a liquid crystal display (LCD), a plasma display panel (PDP), a field emission display (FED), an organic light emitting diode, and the like are being commercialized.

The organic light emitting diode has advantages in that and it can have elements formed even on a flexible substrate such as plastic; can be driven at a low voltage of 10V or lower as compared with a plasma display panel or an inorganic light emitting diode; and can have a comparatively low power consumption and excellent feeling of color. Further, since the organic light emitting diode expresses three colors of red, green, and blue, it has attracted the attention of many people as a next generation display expressing full colors.

The organic light emitting diode may be manufactured by sequentially stacking an anode, a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, an electron injection layer, and a cathode. As for the organic light emitting diode, holes injected from the anode and electrons injected from the cathode are recombined with each other to generate excitons, which are stabilized to a ground state to emit light. An exciton blocking layer having superior stability is often used to prevent the generated excitons from being quenched.

Singlet and triplet excitons exist at a ratio of 1:3. Only singlet excitons are used for fluorescence and both singlet and triplet excitons are used for phosphorescence, thereby obtaining superior luminous efficiency. As such, a phosphorescence material may have very high quantum efficiency as compared with a fluorescence material, and thus a lot of researches thereof are being conducted for methods of improving efficiency and lowering consumption power of the organic light emitting diode.

SUMMARY

Embodiments of the invention provide a blue phosphorescence compound and an organic light emitting diode comprising the same.

In one aspect, there is a blue phosphorescence compound represented by the following Chemical Formula 1,

wherein, in Chemical Formula 1, X1, X2, and X3 each are a nitrogen atom or a carbon atom; A is a 5- to 6-membered nitrogen-containing heteroaromatic group consisting of X1—X2—N; B is a 5- to 6-membered aromatic or heteroaromatic group consisting of X3—C; X4-L1-X5 is a bidentate ligand; X4 and X5 each are independently a carbon atom, a nitrogen atom, or an oxygen atom; L1 is an atom group forming the bidentate ligand; n is an integer of 1 to 3; a is an integer of 0 to 3; b is an integer of 0 to 3; Ra and Rb each are independently one selected from hydrogen, D, halogens of F, Cl, and Br, CF3, cyano groups, C1˜C18 alkyl groups, C1˜C18 alkoxy groups, C6 or more substituted or unsubstituted aromatic groups, C5 or more substituted or unsubstituted heteroaromatic groups, C1˜C18 amine groups, amine groups substituted with C6 or more aromatic groups, amine groups substituted with C5 or more heteroaromatic groups, silyl groups substituted with C1˜C18 alkyl groups or C6 or more aromatic groups, and silyl groups substituted with C5 or more heteroaromatic groups; and Rc is one selected from C3˜C18 alkyl groups, C3˜C18 alkoxy groups, C6 or more substituted or unsubstituted aromatic groups, C5 or more substituted or unsubstituted heteroaromatic groups, C3˜C18 amine groups, amine groups substituted with C6 or more aromatic groups, amine groups substituted with C5 or more heteroaromatic groups, silyl groups substituted with C3˜C18 alkyl or C6 or more aromatic groups, and silyl groups substituted with C5 or more heteroaromatic groups.

In one aspect, there is an organic light emitting diode comprising an organic film formed between an anode and a cathode, the organic light emitting diode comprising the blue phosphorescence compound.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. In the drawings:

FIG. 1 is a view showing an organic light emitting diode according to an exemplary embodiment of the invention;

FIG. 2 is a graph showing UV-vis/PL spectra of Compounds B-7 prepared according to one synthetic example of the invention;

FIG. 3 is a graph showing UV-vis/PL spectra of Compounds B-13 prepared according to another synthetic example of the invention; and

FIG. 4 is a graph showing UV-vis/PL spectra of Compounds B-17 prepared according to still another synthetic example of the invention;

DETAILED DESCRIPTION OF THE EMBODIMENTS

Reference will now be made in detail to embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. It will be paid attention that detailed description of known arts will be omitted if it is determined that the arts can mislead the embodiments of the invention.

FIG. 1 is a view showing an organic light emitting diode according to an exemplary embodiment of the invention.

As shown in FIG. 1, an organic light emitting diode 100 according to an exemplary embodiment of the invention include an anode 110, a hole injection layer 120, a hole transport layer 130, a light emitting layer 140, an electron transport layer 150, an electron injection layer 160, and a cathode 170.

The anode 110, into which holes are injected, is formed of any one of indium tin oxide (ITO), indium zinc oxide (IZO), and zinc oxide (ZnO), which have a high work function. In addition, when the anode 110 is a reflective electrode, the anode 110 may further include a reflective layer of any one of aluminum (Al), silver (Ag), and nickel (Ni), below a layer of any one of ITO, IZO, and ZnO.

The hole injection layer 120 serves to facilitate the injection of holes into the light emitting layer 140 from the anode 110, and is formed of any one selected from the group consisting of cupper phthalocyanine (CuPc), poly(3,4)-ethylenedioxythiophene (PEDOT), polyaniline (PANI), and N,N-dinaphthyl-N,N′-diphenyl benzidine (NPD), but is not limited thereto.

The hole injection layer 120 has a thickness of 1 to 150 nm. Here, the hole injection layer 120 with a thickness of 1 nm or greater has an advantage of preventing the deterioration of hole injection characteristics, and the hole injection layer 120 with a thickness of 150 nm or smaller has an advantage of preventing the increase of driving voltage, which may be caused in order to improve the movement of holes when the hole injection layer 120 is too thick.

The hole transport layer 130 serves to facilitate the transport of holes, and is formed of any one selected from the group consisting of N,N-dinaphthyl-N,N′-diphenyl benzidine (NPD), N,N′-bis-(3-methylphenyl)-N,N′-bis-(phenyl)-benzidine (TDN), s-TAD, and 4,4′,4″-tris(N-3-methylphenyl-N-phenyl-amino)-triphenylamine (MTDATA), but is not limited thereto.

The hole transport layer 130 has a thickness of 1 to 150 nm. Here, the hole transport layer 130 with a thickness of 5 nm or greater has an advantage of preventing the deterioration of hole transport characteristics, and the hole transport layer 130 with a thickness of 150 nm or smaller has an advantage of preventing the increase of driving voltage, which may be caused in order to improve the movement of holes when the hole transport layer 120 is too thick.

The light emitting layer 140 is formed of a material emitting blue light, and may be formed by using a phosphorescence material. In the present exemplary embodiment, the material emitting blue light will be described.

The light emitting layer 140 of the invention is formed of a blue phosphorescence compound represented by Chemical Formula 1 below:

wherein, in Chemical Formula 1, X1, X2, and X3 each are a nitrogen atom or a carbon atom; A is a 5- to 6-membered nitrogen-containing heteroaromatic group consisting of X1—X2—N; and B is a 5- to 6-membered aromatic or heteroaromatic group consisting of X3—C; X4-L1-X5 is a bidentate ligand; X4 and X5 each are independently a carbon atom, a nitrogen atom, or an oxygen atom; L1 is an atom group forming the bidentate ligand; n is an integer of 1 to 3; a is an integer of 0 to 3; and b is an integer of 0 to 3; Ra and Rb each are independently one selected from hydrogen, D, halogens of F, Cl, and Br, CF3, cyano groups, C1˜C18 alkyl groups, C1˜C18 alkoxy groups, C6 or more substituted or unsubstituted aromatic groups, C5 or more substituted or unsubstituted heteroaromatic groups, C1˜C18 amine groups, amine groups substituted with C6 or more aromatic groups, amine groups substituted with C5 or more heteroaromatic groups, silyl groups substituted with C1˜C18 alkyl groups or C6 or more aromatic groups, and silyl groups substituted with C5 or more heteroaromatic groups; and Rc is one selected from C3˜C18 alkyl groups, C3˜C18 alkoxy groups, C6 or more substituted or unsubstituted aromatic groups, C5 or more substituted or unsubstituted heteroaromatic groups, C3˜C18 amine groups, amine groups substituted with C6 or more aromatic groups, amine groups substituted with C5 or more heteroaromatic groups, silyl groups substituted with C3˜C18 alkyl or 06 or more aromatic groups, and silyl groups substituted with C5 or more heteroaromatic groups.

The blue phosphorescence compound is represented by any one of Chemical Formulas below.

Here, a is an integer of 0 to 3; b is an integer of 0 to 3; Ra and Rb each are independently one selected from hydrogen, D, halogens of F, Cl, and Br, CF3, cyano groups, C1˜C18 alkyl groups, C1˜C18 alkoxy groups, C6 or more substituted or unsubstituted aromatic groups, C5 or more substituted or unsubstituted heteroaromatic groups, C1˜C18 amine groups, amine groups substituted with C6 or more aromatic groups, amine groups substituted with C5 or more heteroaromatic groups, silyl groups substituted with C1˜C18 alkyl groups or C6 or more aromatic groups, and silyl groups substituted with C5 or more heteroaromatic groups; and Rc is one selected from C3˜C18 alkyl groups, C3˜C18 alkoxy groups, C6 or more substituted or unsubstituted aromatic groups, C5 or more substituted or unsubstituted heteroaromatic groups, C3˜C18 amine groups, amine groups substituted with C6 or more aromatic groups, amine groups substituted with C5 or more heteroaromatic groups, silyl groups substituted with C3˜C18 alkyl or C6 or more aromatic groups, and silyl groups substituted with C5 or more heteroaromatic groups.

Therefore, the blue phosphorescence compound is represented by any one of Chemical Formulas below.

The blue phosphorescence compound is used as a dopant of the light emitting layer 140. When the blue phosphorescence compound is used as a dopant, it may be doped in the light emitting layer at a weight ratio of 0.1 to 50% or may be doped at a weight ratio of 1 to 20%.

The electron transport layer 150 serves to facilitate the transport of electrons, and is formed of any one selected from the group consisting of Alq3 (tris(8-hydroxyquinolino)aluminum), PBD, TAZ, spiro-PBD, BAlq, and SAlq, but is not limited thereto.

The electron transport layer 150 has a thickness of 1 to 50 nm. Here, the electron transport layer 150 with a thickness of 1 nm or greater has an advantage of preventing the deterioration of electron transport characteristics, and the electron transport layer 160 with a thickness of 150 nm or smaller has an advantage of preventing the increase of driving voltage, which may be caused in order to improve the movement of electrons when the electron transport layer 150 is too thick.

The electron injection layer 160 serves to facilitate the injection of electrons, and is formed of any one selected from the group consisting of Alq3 (tris(8-hydroxyquinolino)aluminum), PBD, TAZ, Spiro-PBD, BAlq, and SAlq, but is not limited thereto.

The electron injection layer 160 has a thickness of 1 to 50 nm. Here, the electron injection layer 160 with a thickness of 1 nm or greater has an advantage of preventing the deterioration of electron injection characteristics, and the electron injection layer 160 with a thickness of 150 nm or smaller has an advantage of preventing the increase of driving voltage, which may be caused in order to improve the movement of electrons when the electron injection layer 160 is too thick.

The cathode 170 is an electron injection electrode, and is formed of magnesium (Mg), calcium (Ca), aluminum (Al), silver (Ag), or an alloy thereof, having a low work function. Here, the cathode 170 may be thin enough to transmit light therethrough when the organic light emitting diode has a top emission type or a double emission type, and may be thick enough to reflect light therefrom when the organic light emitting diode has a back emission type.

Hereinafter, the blue phosphorescence compound and the organic light emitting diode including the same of the present invention will be described with reference to synthetic examples and examples below. However, the examples below are for merely exemplifying the invention, and therefore, the scope of the invention is not limited thereto.

SYNTHETIC EXAMPLE 1

Synthesis of Blue Phosphorescence Compound Represented by B-7

1) Synthesis of Compound A1

In a 500 ml round bottom flask, 2-bromo-4-fluorobenzaldehyde (10.00 g, 49.26 mmol), 2,6-dimethylphenylboronic acid (8.87 g, 59.11 mmol), tetrakis(triphenylphosphine)palladium(0) (2.85 g, 2.46 mmol), and potassium carbonate (29.96 g, 216.74 mmol) were added to a mixture liquid of tetrahydrofuran (THF, 150 ml) and water (50 ml), followed by reflux for 24 hours. The temperature was lowered to room temperature, followed by removal of tetrahydrofuran (THF), extraction with dichloromethane and water, concentration of the solution, and then column chromatography using methylene chloride and hexane, thereby obtaining Compound A1 (7.12 g, 31.19 mmol).

2) Synthesis of Compound A2

Compound A1 (7.00 g, 30.67 mmol) and ethylenediamine (2.03 g, 33.73 mmol) were put into a 250 ml round bottom flask, and then dissolved in tert-butanol (150 ml), followed by heating at 70□ for 30 minutes. After that, potassium carbonate (12.72 g, 92.00 mmol) and iodine (9.73 g, 38.33 mmol) were added thereto, followed by reflux for further 3 hours. The temperature was lowered to room temperature, followed by quenching with sodium carbonate, extraction with ethylene acetate and water, and then concentration of the solution. The concentrated compound was dissolved in methylene chloride, and then the pH value was adjusted to 12˜14 by using an aqueous solution of sodium hydroxide, followed by re-extraction, concentration of the solution, precipitation using methylene chloride and petroleum ether, and reduced pressure filtration, thereby obtaining Compound A2 (4.05 g, 15.09 mmol).

3) Synthesis of Compound A3

In a 250 ml round bottom flask, Compound A2 (4.05 g, 15.09 mmol) was dissolved in acetonitrile (150 ml), and then a mixture of potassium permanganate (5.96 g, 37.73 mmol) and montmorillonite K-10 (11.93 g) was slowly added thereto at room temperature. The resultant solution was stirred for 10 minutes at room temperature, and then the reaction was completed by adding ethanol thereto. Filtration was carried out by using ethyl acetate through cellite, followed by concentration of the solution and then column chromatography using ethyl acetate and hexane, thereby obtaining Compound A3 (2.05 g, 7.70 mmol).

4) Synthesis of Compound A4

In a 250 ml round bottom flask, Compound A3 (2.05 g, 7.70 mmol) was dissolved in tetrahydrofuran (THF, 40 ml), and then sodium hydride (0.51 g, 21.25 mmol) was added thereto, followed by reflux for 1 hour. After that, methylene iodide (1.31 g, 9.23 mmol) was added thereto, followed by reflux for further 3 hours. The reaction was completed by adding water thereto, followed by extraction with ethyl acetate, concentration of the solution, and column chromatography using ethyl acetate and hexane, thereby obtaining Compound A4 (1.51 g, 5.39 mmol).

5) Synthesis of Compound B-7

After Compound A4 (1.51 g, 5.39 mmol) and iridium (III) acetylacetonate (0.53 g, 1.08 mmol) were put into a 25 ml round bottom flask, the reaction mixture was vacuum-dried for 30 minutes, and the reaction flask was filled with a nitrogen gas (repeated three times). The reaction mixture was reacted at 240□ for 48 hours, and then the temperature was lowered to room temperature, followed by filtration using methanol. The filtered precipitate was dissolved in methylene chloride, followed by column chromatography using hexane. After that, precipitation was carried out by using methylene chloride and methanol, followed by reduced pressure filtration, thereby synthesizing Compound B-7 (0.27 g, 0.26 mmol)

SYNTHETIC EXAMPLE 2

Synthesis of Blue Phosphorescence Compound Represented by B-13

1) Synthesis of Compound A11

In a 250 ml round bottom flask, Compound A3 (4.00 g, 15.02 mmol) was dissolved in tetrahydrofuran (THF, 70 ml), and then sodium hydride (0.99 g, 41.46 mmol) was added thereto, followed by reflux for 1 hour. After that, ethylene iodide (2.81 g, 18.02 mmol) was added thereto, followed by reflux for further 3 hours. The reaction was completed by adding water thereto, followed by extraction with ethyl acetate, concentration of the solution, and column chromatography using ethyl acetate and hexane, thereby obtaining Compound A11 (2.02 g, 6.86 mmol).

2) Synthesis of Compound B-13

After compound A11 (2.02 g, 6.86 mmol) and iridium (III) acetylacetonate (0.67 g, 1.37 mmol) were put into a 25 ml round bottom flask, the reaction mixture was vacuum-dried for 30 minutes, and the reaction flask was filled with a nitrogen gas (repeated three times). The reaction mixture was reacted at 240□ for 48 hours, and then the temperature was lowered to room temperature, followed by filtration using methanol. The filtered precipitate was dissolved in methylene chloride, followed by column chromatography using hexane. After that, precipitation was carried out by using methylene chloride and methanol, followed by reduced pressure filtration, thereby synthesizing Compound B-13 (0.31 g, 0.29 mmol).

SYNTHETIC EXAMPLE 3

Synthesis of Blue Phosphorescence Compound Represented by B-17

1) Synthesis of Compound A21

In a 500 ml round bottom flask, 2-bromo-4-fluorobenzaldehyde (10.00 g, 49.26 mmol), 2,4,6-triisopropylphenylboronic acid (14.67 g, 59.11 mmol), tetrakis(triphenylphosphine)palladium(0) (2.85 g, 2.46 mmol), and potassium carbonate (29.96 g, 216.74 mmol) were added to a mixture liquid of tetrahydrofuran (THF, 150 ml) and water (50 ml), followed by reflux for 24 hours. After the temperature was lowered to room temperature, tetrahydrofuran was removed, followed by extraction with dichloromethane and water, concentration of the solution, and column chromatography using methylene chloride and hexane, thereby obtaining Compound A21 (11.50, 35.23 mmol).

2) Synthesis of Compound A22

Compound A21 (11.50 g, 35.23 mmol) and ethylenediamine (2.33 g, 38.75 mmol) were put into a 250 ml round bottom flask, and then melted in tert-butanol (170 ml), followed by heating at 70□ for 30 minutes. After that, potassium carbonate (14.61 g, 105.68 mmol) and iodine (11.18 g, 44.03 mmol) were added thereto, followed by reflux for further 3 hours. The temperature is lowered to room temperature, followed by quenching with sodium carbonate, extraction with ethylene acetate and water, and concentration of the solution. The concentrated compound was dissolved in methylene chloride, and then the pH value was adjusted to 12˜14 by using an aqueous solution of sodium hydroxide, followed by re-extraction, concentration of the solution, precipitation using methylene chloride and petroleum ether, and then reduced pressure filtration, thereby obtaining Compound A22 (7.01 g, 19.13 mmol).

3) Compound A23

In a 250 ml round bottom flask, Compound A22 (7.01 g, 19.13 mmol) was dissolved in acetonitrile (180 ml), and then a mixture of potassium permanganate (7.56 g, 47.82 mmol) and montmorillonite K-10 (15.11 g) was slowly added thereto at room temperature. The resultant solution was stirred for 10 minutes at room temperature, and then the reaction was completed by adding ethanol thereto. Filtration was carried out by using ethyl acetate through cellite, followed by concentration of the solution and then column chromatography using ethyl acetate and hexane, thereby obtaining Compound A23 (3.65 g, 10.01 mmol).

4) Synthesis of Compound A24

In a 250 ml round bottom flask, Compound A23 (3.65 g, 10.01 mmol) was dissolved in tetrahydrofuran (60 ml), and then sodium hyride (0.66 g, 27.64 mmol) was added thereto, followed by reflux for 1 hour. After that, methylene iodide (1.71 g, 12.02 mmol) was added thereto, followed by reflux for further 3 hours. The reaction was completed by adding water thereto, followed by extraction with ethyl acetate, concentration of the solution, and column chromatography using ethyl acetate and hexane, thereby obtaining Compound A24 (2.50 g, 6.60 mmol).

5) Synthesis of Compound B-17

After compound A24 (2.50 g, 6.60 mmol) and iridium (III) acetylacetonate (0.65 g, 1.33 mmol) were put into a 25 ml round bottom flask, the reaction mixture was vacuum-dried for 30 minutes, and the reaction flask was filled with a nitrogen gas (repeated three times). The reaction mixture was reacted at 240□ for 48 hours, and then the temperature was lowered to room temperature, followed by filtration using methanol. The filtered precipitate was dissolved in methylene chloride, followed by column chromatography using hexane. After that, precipitation was carried out by using methylene chloride and methanol, followed by reduced pressure filtration, thereby synthesizing Compound B-17 (0.31 g, 0.23 mmol).

Ultra violet-Photo luminescence (UV-vis/PL) spectra of the prepared compounds B-7, -13, and -17 were measured, and characteristics thereof are shown in FIGS. 2, 3, and 4.

Hereinafter, examples will be set forth in which light emitting diodes are manufactured by using, as a blue dopant, the foregoing compounds B-7, -13, and -17, and a blue phosphorescence compound, which is represented for a comparative example.

EXAMPLE 1

An ITO substrate was patterned to have a light emitting area of 3 mm×3 mm, and then washed. After the substrate was installed in a vacuum chamber, the base pressure was made to be 1×10-6 torr. Then, on the anode ITO, HAT-CN was formed with a thickness of 50 Å for a hole injection layer, NPD was formed with a thickness of 550 Å for a hole transport layer, TAPC was formed with a thickness of 100 Å for an electron blocking layer, and mCP having a thickness of 300□ as a host and Compound B-7 having a doping concentration of 15% as a dopant were formed for a light emitting layer. Then, TmPyPb was formed with a thickness of 400 Å for an electron transport layer, LiF was formed with a thickness of 5 Å for an electron injection layer, and then Al was formed with a thickness of 1000 Å for a cathode, resulting in manufacturing an organic light emitting diode.

EXAMPLE 2

An organic electroluminescent display was manufactured under the same process conditions as the foregoing Example 1, only except that Compound B-13 was used as a dopant of a light emitting layer.

EXAMPLE 3

An organic electroluminescent display was manufactured under the same process conditions as the foregoing Example 1, only except that Compound B-17 was used as a dopant of a light emitting layer.

COMPARATIVE EXAMPLE

An organic electroluminescent display was manufactured under the same process conditions as the foregoing Example 1, only except that a compound represented by Chemical Formula below was used as a dopant of a light emitting layer.

COMPARATIVE EXAMPLE

Voltages, currents, current efficiencies, power efficiencies, quantum efficiencies, and color coordinates of the organic light emitting diodes manufactured according to Examples 1 to 3 and the comparative example above were measured, and then tabulated in Table 1 below.


TABLE 1
Current
Power
Quantum
Voltage
Current
Efficiency
Efficiency
Efficiency
Color Coordinate
(V)
(mA/cm2)
(cd/A)
(lm/W)
(%)
CIE_x
CIE_y
Example 1
7.76
10
23.80
9.64
11.75
0.183
0.342
Example 2
7.72
10
20.70
8.42
10.02
0.171
0.354
Example 3
7.84
10
23.62
9.46
11.60
0.180
0.341
Comparative
7.86
10
12.75
5.10
6.7
0.195
0.333
Example

Referring to Table 1, it can be confirmed that Examples 1 to 3, which respectively employ Compounds B-7, B-13, and B-17, showed significantly improved current efficiencies, power efficiencies, and quantum efficiencies while showing the same level of color coordinates, as compared with the comparative example.

As described above, according to the present invention, power efficiencies, current efficiencies, and quantum efficiencies of the organic light emitting diode can be improved by preparing a new blue phosphorescence compound and then using it as a dopant of the light emitting layer of the organic light emitting diode.

Although embodiments have been described with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the scope of the principles of this disclosure. More particularly, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, alternative uses will also be apparent to those skilled in the art.

Read more
PatSnap Solutions

Great research starts with great data.

Use the most comprehensive innovation intelligence platform to maximise ROI on research.

Learn More

Citation

Patents Cited in This Cited by
Title Current Assignee Application Date Publication Date
Phosphorescent emitters and host materials with improved stability UNIVERSAL DISPLAY CORPORATION 26 August 2010 10 March 2011
White light emission organic electroluminescent element, illuminating device and display KONICA MINOLTA HOLDINGS, INC. 26 June 2009 14 April 2011
White Light Emitting Organic Electroluminescence Element, Display and Illuminator KONICA MINOLTA HOLDINGS, INC. 07 July 2005 14 February 2008
新規なピリミジニル基含有イリジウム錯体、それよりなる発光材料およびそれを用いた有機EL素子 ケミプロ化成株式会社 26 April 2007 03 April 2008
有機エレクトロルミネッセンス素子材料、有機エレクトロルミネッセンス素子、表示装置及び照明装置 コニカミノルタホールディングス株式会社 19 August 2005 01 March 2007
See full citation <>

More like this

Title Current Assignee Application Date Publication Date
Organic electroluminescent compounds and organic electroluminescent device comprising the same ROHM AND HAAS ELECTRONIC MATERIALS KOREA LTD. 04 October 2016 27 April 2017
Pt- or pd-carbene complexes for use in organic light emitting diodes BASF SE 18 November 2015 26 May 2016
Formulation of an organic functional material MERCK PATENT GMBH 17 January 2017 24 August 2017
Organic electroluminescent compound and organic electroluminescent device comprising the same ROHM & HAAS ELECTRONIC MATERIALS KOREA LTD. 06 November 2015 12 May 2016
Materials for organic electroluminescent devices MERCK PATENT GMBH 26 February 2016 29 September 2016
Organic electroluminescent compounds and organic electroluminescent device comprising the same ROHM AND HAAS ELECTRONIC MATERIALS KOREA LTD. 02 August 2016 16 March 2017
Benzimidazolo[1,2-a]benzimidazole carrying benzimidazolo[1,2-a]benzimidazolyl groups, carbazolyl groups, benzofurane groups or benzothiophene groups for organic light emitting diodes IDEMITSU KOSAN CO., LTD. 30 September 2016 06 April 2017
Phosphorous host material and organic electroluminescent device comprising the same ROHM AND HAAS ELECTRONIC MATERIALS KOREA LTD. 08 April 2016 24 November 2016
Materials for organic electroluminescent devices MERCK PATENT GMBH 06 October 2016 04 May 2017
Compound, composition and organic light-emitting device CAMBRIDGE DISPLAY TECHNOLOGY LIMITED,SUMITOMO CHEMICAL CO., LTD 20 February 2017 31 August 2017
Materials for organic electroluminescent devices MERCK PATENT GMBH 13 July 2016 16 February 2017
Compound, composition, organic electroluminescence element, and electronic device IDEMITSU KOSAN CO.,LTD. 12 February 2016 18 August 2016
Nitrogen-containing heterocyclic compounds and organic electroluminescence devices containing them IDEMITSU KOSAN CO., LTD. 21 December 2016 29 June 2017
Organic electroluminescent element HODOGAYA CHEMICAL CO., LTD.,SFC CO., LTD 05 January 2016 14 July 2016
Organic electroluminescent compound and organic electroluminescent device comprising the same ROHM AND HAAS ELECTRONIC MATERIALS KOREA LTD. 27 July 2017 01 February 2018
発光素子及び発光装置 株式会社半導体エネルギー研究所 15 February 2010 17 June 2010
Materials for organic electroluminescent devices MERCK PATENT GMBH 19 May 2016 15 December 2016
Organic electroluminescent element NIPPON STEEL & SUMIKIN CHEMICAL CO., LTD. 03 March 2016 06 October 2016
See all similar patents <>

More Patents & Intellectual Property

PatSnap Solutions

PatSnap solutions are used by R&D teams, legal and IP professionals, those in business intelligence and strategic planning roles and by research staff at academic institutions globally.

PatSnap Solutions
Search & Analyze
The widest range of IP search tools makes getting the right answers and asking the right questions easier than ever. One click analysis extracts meaningful information on competitors and technology trends from IP data.
Business Intelligence
Gain powerful insights into future technology changes, market shifts and competitor strategies.
Workflow
Manage IP-related processes across multiple teams and departments with integrated collaboration and workflow tools.
Contact Sales
Clsoe
US10153440 Blue phosphorescence compound organic 1 US10153440 Blue phosphorescence compound organic 2 US10153440 Blue phosphorescence compound organic 3