CN110922430A - Green phosphorescent compound and organic electroluminescent device using same - Google Patents
Green phosphorescent compound and organic electroluminescent device using same Download PDFInfo
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- CN110922430A CN110922430A CN201911009542.4A CN201911009542A CN110922430A CN 110922430 A CN110922430 A CN 110922430A CN 201911009542 A CN201911009542 A CN 201911009542A CN 110922430 A CN110922430 A CN 110922430A
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- 125000004191 (C1-C6) alkoxy group Chemical group 0.000 claims description 4
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- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 claims description 2
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 claims description 2
- 125000005956 isoquinolyl group Chemical group 0.000 claims description 2
- 125000000956 methoxy group Chemical group [H]C([H])([H])O* 0.000 claims description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 2
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- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 2
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- 229910052711 selenium Inorganic materials 0.000 claims description 2
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- 230000007423 decrease Effects 0.000 abstract description 3
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- 239000010410 layer Substances 0.000 description 37
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- 238000004895 liquid chromatography mass spectrometry Methods 0.000 description 10
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- 238000010992 reflux Methods 0.000 description 9
- XCJYREBRNVKWGJ-UHFFFAOYSA-N copper(II) phthalocyanine Chemical compound [Cu+2].C12=CC=CC=C2C(N=C2[N-]C(C3=CC=CC=C32)=N2)=NC1=NC([C]1C=CC=CC1=1)=NC=1N=C1[C]3C=CC=CC3=C2[N-]1 XCJYREBRNVKWGJ-UHFFFAOYSA-N 0.000 description 8
- 239000000539 dimer Substances 0.000 description 8
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- 238000010438 heat treatment Methods 0.000 description 6
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- VQGHOUODWALEFC-UHFFFAOYSA-N 2-phenylpyridine Chemical compound C1=CC=CC=C1C1=CC=CC=N1 VQGHOUODWALEFC-UHFFFAOYSA-N 0.000 description 2
- MFELLNQJMHCAKI-UHFFFAOYSA-N 3,7-diethylnonane-4,6-dione Chemical compound CCC(CC)C(=O)CC(=O)C(CC)CC MFELLNQJMHCAKI-UHFFFAOYSA-N 0.000 description 2
- WQDUMFSSJAZKTM-UHFFFAOYSA-N Sodium methoxide Chemical compound [Na+].[O-]C WQDUMFSSJAZKTM-UHFFFAOYSA-N 0.000 description 2
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- 238000000926 separation method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
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- ROEQGIFOWRQYHD-UHFFFAOYSA-N (2-methoxyphenyl)boronic acid Chemical compound COC1=CC=CC=C1B(O)O ROEQGIFOWRQYHD-UHFFFAOYSA-N 0.000 description 1
- DJGHSJBYKIQHIK-UHFFFAOYSA-N (3,5-dimethylphenyl)boronic acid Chemical compound CC1=CC(C)=CC(B(O)O)=C1 DJGHSJBYKIQHIK-UHFFFAOYSA-N 0.000 description 1
- GONULLRFSHKLBS-UHFFFAOYSA-N 2-chloro-3-fluoro-4-iodopyridine Chemical compound FC1=C(I)C=CN=C1Cl GONULLRFSHKLBS-UHFFFAOYSA-N 0.000 description 1
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- 239000007983 Tris buffer Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 229910052802 copper Inorganic materials 0.000 description 1
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- 230000000694 effects Effects 0.000 description 1
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- RBTKNAXYKSUFRK-UHFFFAOYSA-N heliogen blue Chemical compound [Cu].[N-]1C2=C(C=CC=C3)C3=C1N=C([N-]1)C3=CC=CC=C3C1=NC([N-]1)=C(C=CC=C3)C3=C1N=C([N-]1)C3=CC=CC=C3C1=N2 RBTKNAXYKSUFRK-UHFFFAOYSA-N 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
- IBHBKWKFFTZAHE-UHFFFAOYSA-N n-[4-[4-(n-naphthalen-1-ylanilino)phenyl]phenyl]-n-phenylnaphthalen-1-amine Chemical group C1=CC=CC=C1N(C=1C2=CC=CC=C2C=CC=1)C1=CC=C(C=2C=CC(=CC=2)N(C=2C=CC=CC=2)C=2C3=CC=CC=C3C=CC=2)C=C1 IBHBKWKFFTZAHE-UHFFFAOYSA-N 0.000 description 1
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- C07F15/00—Compounds containing elements of Groups 8, 9, 10 or 18 of the Periodic Table
- C07F15/0006—Compounds containing elements of Groups 8, 9, 10 or 18 of the Periodic Table compounds of the platinum group
- C07F15/0033—Iridium compounds
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- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/06—Luminescent, e.g. electroluminescent, chemiluminescent materials containing organic luminescent materials
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
- H10K50/12—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers comprising dopants
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- H10K85/30—Coordination compounds
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- C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
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Abstract
The invention discloses a green phosphorescent compound, the structural formula of which is shown as formula (I)
The present invention relates to a green phosphor used as a dopant for a light emitting layer of an organic electroluminescent device formed by sequentially depositing 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. The disadvantage that it is difficult to provide high luminous efficiency as the color purity increases, i.e., the X value of CIE chromaticity coordinates becomes larger, and the visibility decreases when a green phosphorescent material is used is overcome.
Description
Technical Field
The invention relates to the field of phosphorescent compounds, in particular to a green phosphorescent compound and an organic electroluminescent device using the same.
Background
In recent years, as the size of display devices is getting larger, flat display devices occupying less space are more and more required. The flat panel display device includes an organic electroluminescent device, also called an Organic Light Emitting Diode (OLED). The technology of the organic electroluminescent device is developing at a great speed, and many prototypes have been disclosed.
When electric charges are injected into an organic layer formed between an electron injection electrode (cathode) and a hole injection electrode (anode), the organic electroluminescent device emits light. More specifically, when an electron and a hole form a pair, light is emitted, and the newly generated electron-hole pair decays. The organic electroluminescent device may be formed on a flexible transparent substrate such as plastic. The organic electroluminescent device may also be driven at a lower voltage (i.e., a voltage less than or equal to 10V) than that required in a plasma display panel or an inorganic Electroluminescent (EL) display. The organic electroluminescent device is advantageous in that it consumes less power and provides excellent color display compared to other display devices. Also, since the organic electroluminescent device can reproduce pictures using three colors (i.e., green, blue, and red), the organic electroluminescent device is widely recognized as a next-generation color display device that can reproduce clear images.
The process of fabricating an organic Electroluminescent (EL) device is described as follows:
(1) the anode material is coated on a transparent substrate. Generally, Indium Tin Oxide (ITO) is used as an anode material.
(2) A Hole Injection Layer (HIL) is deposited on the anode material. The hole injection layer is formed of a copper phthalocyanine (CuPc) layer having a thickness of 10 to 30 nm.
(3) A void-transporting layer (HTL) is then deposited. The hole transport layer is mainly formed of 4, 4' -bis [ N- (1-naphthyl) -N-phenylamino ] biphenyl (NPB), and is first vacuum-evaporated and then coated to a thickness of 30 to 60 nm.
(4) Thereafter, an organic light emitting layer is formed. At this time, a dopant may be added, if necessary. In the case of green light emission, the organic light emitting layer is generally formed of tris (8-hydroxyquinolinato) aluminum (Alq3) evaporated in vacuum to have a thickness of 30 to 60 nm. And, MQD (N-methyl quinacridone copper) is used as a dopant (or impurity).
(5) An Electron Transport Layer (ETL) and an Electron Injection Layer (EIL) are sequentially formed on the organic light emitting layer, or an electron injection/transport layer is formed on the organic light emitting layer. In the case of green light emission, Alq3 of step (4) has excellent electron transport ability. Therefore, electron injection and transport layers are not necessarily required.
(6) Finally, a cathode layer is coated, and a protective layer is coated on the whole structure.
Light emitting devices that emit (or display) blue, green, and red colors, respectively, are determined according to the method of forming the light emitting layer in the above structure. As the light emitting material, excitons are formed by recombination of electrons and holes injected from each electrode. Singlet excitons emit fluorescence and triplet excitons emit phosphorescence. Singlet excitons that emit fluorescence have a 25% formation probability, whereas triplet excitons that emit phosphorescence have a 75% formation probability. Thus, triplet excitons provide greater luminous efficiency than singlet excitons. In such a phosphorescent material, the green phosphorescent material may have greater luminous efficiency than the fluorescent material. Accordingly, as an important factor for improving the efficiency of the organic electroluminescent device, a green phosphorescent material is being widely studied.
When such a phosphorescent material is used, high luminous efficiency, high color purity and prolonged durability are required. Most particularly, when a green phosphorescent material is used, visibility is reduced as color purity increases (i.e., X value of CIE chromaticity coordinates becomes larger), thereby causing difficulty in providing high luminous efficiency. Accordingly, there is a need to develop a green phosphorescent material that can provide excellent chromaticity coordinates, improved luminous efficiency, and extended durability.
Disclosure of Invention
The invention aims to provide a green phosphorescent compound, the structural formula of which is represented by formula (I)
Preferably, R1, R2, R3, R4, R5, R6 and R7 are respectively and independently one of substituted or unsubstituted C1-C6 alkyl, C1-C6 alkoxy and halogen; wherein X is selected from O, S and Se.
Preferably, wherein the C1-C6 alkyl group is selected from methyl, methyl-d 3, ethyl, n-propyl, isopropyl, n-butyl, isobutyl and tert-butyl; wherein the C1-C6 alkoxy is selected from methoxy and ethoxy; halogen is selected from bromine, chlorine, iodine, fluorine.
Preferably, wherein formula (i) is any one of the following formulae:
the present invention also provides an organic electroluminescent device using a green phosphorescent compound, comprising an anode layer, a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, an electron injection layer and a cathode layer deposited in sequence with one another, the organic electroluminescent device using the compound as a material of the light emitting layer.
Preferably, the mass percentage of the dopant in the light-emitting layer is 0.1% to 50%.
Preferably, any one of an Al metal complex, a Zn metal complex, and a carbazole derivative is used as the host material of the light-emitting layer.
Preferably, the ligands of the Al metal complex and the Zn metal complex include quinolyl, biphenyl, isoquinolyl, phenyl, methylquinolyl, dimethylquinolyl, dimethylisoquinolyl; carbazole derivatives include CBP.
Compared with the prior art, the invention has the beneficial effects that: the present invention relates to a green phosphor used as a dopant for a light emitting layer of an organic electroluminescent device formed by sequentially depositing 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. The disadvantage that it is difficult to provide high luminous efficiency as the color purity increases, i.e., the X value of CIE chromaticity coordinates becomes larger, and the visibility decreases when a green phosphorescent material is used is overcome.
Drawings
Fig. 1 shows a graph in which the visibility decreases as the color purity of the organic electroluminescent device increases (i.e., as the X value of the chromaticity coordinate becomes larger).
FIG. 2 is a structural formula of compounds copper (II) phthalocyanine (CuPc), NPB, Ir (ppy)3, BCP, Alq3 and CBP used in the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
The synthesis method of the green phosphorescent compounds GD-001, GD-271, GD-004 and GD-274 and the test result of the organic electroluminescent device are taken as examples to prove the technical scheme and the achieved technical effect provided by the invention.
Synthesis example of green phosphorescent compound:
1. synthesis of intermediate I-1:
2-chloro-3-fluoro-4-iodopyridine (30g,116.5mmol), 2-methoxyphenylboronic acid was added to a three-necked flask under nitrogen.
(17.7g,116.5mmol), 2M-potassium carbonate (250mL) was dissolved in tetrahydrofuran (250 mL). The nitrogen was purged for 30 minutes, and palladium tetrakistriphenylphosphine (3 mol%) as a catalyst was added. The reaction was warmed to 80 ℃ and stirred under reflux for 12 hours. After cooling to room temperature, the reaction mixture was quenched with water, and the reaction mixture was extracted with ethyl acetate and saturated brine. The mixture was washed with saturated brine two to three times, and the organic phase was taken out. The organic phase was dried over anhydrous magnesium sulfate and concentrated. Purification by silica gel column chromatography gave intermediate I-1(20.8g, yield: 75%). LC-MS M/Z238.7 (M + H)+。
2. Synthesis of intermediate I-2:
me3SiSNa was prepared by adding Me3SiSSiMe3(30.0g,168.3mmol) and NaOMe (5.0g,92.6mmol) to dry 1, 3-dimethyl-Z-imidazolidinone (100mL) at room temperature. To this solution was then added intermediate I-1(20g,84.2 mmol). Heating to 120-After the treatment, purification was performed by column chromatography to obtain intermediate I-2(8.9g, yield: 52%). LC-MS: M/Z204.6 (M + H)+。
3. Synthesis of ligand L-1:
intermediate I-2(8g,39.3mmol), phenylboronic acid (5.3g,43.2mmol), 2M-potassium carbonate (80mL) was dissolved in tetrahydrofuran (80mL) in a three-necked flask under nitrogen. The nitrogen was purged for 30 minutes, and palladium tetrakistriphenylphosphine (3 mol%) as a catalyst was added. The reaction was warmed to 80 ℃ and stirred under reflux for 12 hours. After cooling to room temperature, the reaction mixture was quenched with water, and the reaction mixture was extracted with ethyl acetate and saturated brine. The mixture was washed with saturated brine two to three times, and the organic phase was taken out. The organic phase was dried over anhydrous magnesium sulfate and concentrated. The ligand L-1(8.2g, yield: 85%) was obtained by separation and purification through a silica gel column. LC-MS M/Z246.3 (M + H)+。
4. Synthesis of dichloro-crosslinked dimer complex:
a mixed solution of iridium trichloride monohydrate (3g, 10mmol), ligand L-1(5.4g, 22.1mmol) and diethanolamoether in a ratio of 3/1(120mL/40mL) to distilled water was charged into a dry two-necked round-bottomed flask, heated under reflux for 24 hours, followed by addition of an appropriate amount of distilled water, and the precipitated solid was filtered and washed with methanol and petroleum ether to obtain a dichloro-crosslinked dimer complex (4.0g, yield: 55%). LC-MS: M/Z1433.4(M + H)+。
Synthesis of GD-001:
dichloro-crosslinked dimer complex (4g, 2.8mmol), pentane-2, 4-dione (0.9g, 8.4mmol), anhydrous sodium carbonate (1.8g, 16.8mmol) and 2-ethoxyethanol (80mL) were charged to a two-necked round-bottomed flask,then heating and refluxing for 6 hours, stopping heating, cooling to room temperature, adding a proper amount of distilled water, and filtering out a solid. The solid was dissolved in dichloromethane and passed through a short column of silica gel. The solvent was removed under reduced pressure, and the resulting solid was concentrated and washed with methanol and petroleum ether, respectively, to give GD-001(2.6g, yield: 60%). LC-MS: M/Z780.9(M + H)+。
Synthesis of GD-271:
dichloro-crosslinked dimer complex (4g, 2.8mmol), 3, 7-diethyl-4, 6-nonanedione (1.8g, 8.4mmol), anhydrous sodium carbonate (1.8g, 16.8mmol) and 2-ethoxyethanol (80mL) were added to a two-necked round-bottomed flask, and then heated under reflux for 6 hours, the heating was stopped, the temperature was reduced to room temperature, an appropriate amount of distilled water was added, and a solid was filtered off. The solid was dissolved in dichloromethane and passed through a short column of silica gel. The solvent was removed under reduced pressure, and the resulting solid was concentrated and washed with methanol and petroleum ether, respectively, to give GD-271(3.1g, yield: 62%). LC-MS: M/Z893.1(M + H)+。
7. Synthesis of ligand L-2:
intermediate I-2(8g,39.3mmol),3, 5-dimethylbenzeneboronic acid (6.5g,43.2mmol), and 2M-potassium carbonate (80mL) were dissolved in tetrahydrofuran (80mL) in a three-necked flask under nitrogen. The nitrogen was purged for 30 minutes, and palladium tetrakistriphenylphosphine (3 mol%) as a catalyst was added. The reaction was warmed to 80 ℃ and stirred under reflux for 12 hours. After cooling to room temperature, the reaction mixture was quenched with water, and the reaction mixture was extracted with ethyl acetate and saturated brine. The mixture was washed with saturated brine two to three times, and the organic phase was taken out. The organic phase was dried over anhydrous magnesium sulfate and concentrated. The ligand L-2(8.6g, yield: 80%) was obtained by separation and purification through a silica gel column. LC-MS M/Z274.3 (M + H)+。
8. Synthesis of dichloro-crosslinked dimer complex:
a mixed solution of iridium trichloride monohydrate (3g, 10mmol), ligand L-2(6.0g, 22.1mmol) and diethanolamoether in a ratio of 3/1(120mL/40mL) to distilled water was charged into a dry two-necked round-bottomed flask, and heated under reflux for 24 hours, then an appropriate amount of distilled water was added, and the precipitated solid was filtered and washed with methanol and petroleum ether to obtain a dichloro-crosslinked dimer complex (4.3g, yield: 56%). LC-MS: M/Z1545.6(M + H)+。
Synthesis of GD-004:
dichloro-crosslinked dimer complex (4g, 2.6mmol), pentane-2, 4-dione (0.8g, 7.8mmol), anhydrous sodium carbonate (1.6g, 15.5mmol) and 2-ethoxyethanol (80mL) were added to a two-necked round-bottomed flask, and then heated under reflux for 6 hours, the heating was stopped, the temperature was reduced to room temperature, an appropriate amount of distilled water was added, and the solid was filtered off. The solid was dissolved in dichloromethane and passed through a short column of silica gel. The solvent was removed under reduced pressure, and the resulting solid was concentrated and washed with methanol and petroleum ether, respectively, to give GD-004(2.6g, yield: 61%). LC-MS: M/Z837.0 (M + H)+。
Synthesis of GD-274:
dichloro-crosslinked dimer complex (4g, 2.6mmol), 3, 7-diethyl-4, 6-nonanedione (1.6g, 7.8mmol), anhydrous sodium carbonate (1.6g, 15.5mmol) and 2-ethoxyethanol (80mL) were added to a two-necked round-bottomed flask, and then heated under reflux for 6 hours, the heating was stopped, the temperature was reduced to room temperature, an appropriate amount of distilled water was added, and a solid was filtered off. The solid was dissolved in dichloromethane and passed through a short column of silica gel. Removing solvent under reduced pressure, concentrating to obtain solid, washing with methanol and petroleum ether sequentially to obtainGD-274(2.9g, yield: 60%). LC-MS: M/Z949.2(M + H)+。
Preparation and testing of organic electroluminescent devices:
example 1
The ITO glass substrate was patterned to have a light-emitting area of 3mm × 3 mm. Then, the patterned ITO glass substrate was washed. The substrate is then placed in a vacuum chamber. The standard pressure was set to 1X 10-6And (4) supporting. Thereafter, CuPc was applied onto the ITO substrate
NPB
CBP+GD-001(8％)
BCP
Alq3 
LiF
And Al
The sequence of (a) and (b) forming layers of organic material. At 0.9mA, the luminance is equal to 6890cd/m2(3.5V). In this case, CIEx is 0.47 and y is 0.53.
Example 2
The ITO glass substrate was patterned to have a light-emitting area of 3mm × 3 mm. Then, the patterned ITO glass substrate was washed. The substrate is then placed in a vacuum chamber. The standard pressure was set to 1X 10-6And (4) supporting. Thereafter, CuPc was applied onto the ITO substrate
NPB
CBP+GD-271(8％)
BCP
Alq3 
LiF
And Al
The sequence of (a) and (b) forming layers of organic material. At 0.9mA, the luminance was equal to 7140cd/m2(3.6V). In this case, CIEx is 0.47 and y is 0.54.
Example 3
The ITO glass substrate was patterned to have a light-emitting area of 3mm × 3 mm. Then, the patterned ITO glass substrate was washed. The substrate is then placed in a vacuum chamber. The standard pressure was set to 1X 10-6And (4) supporting. Thereafter, CuPc was applied onto the ITO substrate
NPB
CBP+GD-004(8％)
BCP
Alq3 
LiF
And Al
The sequence of (a) and (b) forming layers of organic material. At 0.9mA, the luminance was equal to 7030cd/m2(3.5V). In this case, CIEx is 0.46 and y is 0.53.
Example 4
The ITO glass substrate was patterned to have a light-emitting area of 3mm × 3 mm. Then, the patterned ITO glass substrate was washed. The substrate is then placed in a vacuum chamber. The standard pressure was set to 1X 10-6And (4) supporting. Thereafter, CuPc was applied onto the ITO substrate
NPB
CBP+GD-274(8％)
BCP
Alq3 
LiF
And Al
The sequence of (a) and (b) forming layers of organic material. At 0.9mA, the luminance was equal to 7380cd/m2(3.4V). In this case, CIEx is 0.46 and y is 0.54.
Comparative example
The ITO glass substrate was patterned to have a light-emitting area of 3mm × 3 mm. Then, the patterned ITO glass substrate was washed. The substrate is then placed in a vacuum chamber. The standard pressure was set to 1X 10-6And (4) supporting. Using CuPc on ITO substrate
NPB
CPB+Ir(ppy)3(6％)
BCP
Alq3 
LiF
And Al
The sequence of (a) and (b) forming layers of organic material. When a hole-carrying layer was formed using BALq, luminance was equal to 5020cd/m at 0.9mA2(3.7V). In this case, CIEx is 0.32 and y is 0.61.
The characteristics of efficiency, chromaticity coordinates and luminance according to the above examples and comparative examples are shown in table 1 below.
TABLE 1
As shown in table 1, the device operates at high efficiency at low voltage even when the color purity is high. Also, the current efficiency of example 2 increased by 20% or more compared to the comparative example.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. A green phosphorescent compound characterized in that: the structural formula is shown as formula (I)
2. A green phosphorescent compound according to claim 1, wherein: wherein R1, R2, R3, R4, R5, R6 and R7 are respectively and independently one of substituted or unsubstituted C1-C6 alkyl, C1-C6 alkoxy and halogen; wherein X is selected from O, S and Se.
3. A green phosphorescent compound according to claim 2, wherein: wherein the C1-C6 alkyl is selected from methyl, methyl-d 3, ethyl, n-propyl, isopropyl, n-butyl, isobutyl and tert-butyl; wherein the C1-C6 alkoxy is selected from methoxy and ethoxy; halogen is selected from bromine, chlorine, iodine, fluorine.
4. A green phosphorescent compound according to claim 1, wherein: wherein formula (I) is any one of the following formulae:
5. an organic electroluminescent device using a green phosphorescent compound according to claim 1, comprising an anode layer, a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, an electron injection layer and a cathode layer deposited in this order from each other, wherein: the organic electroluminescent device uses the compound according to any one of claims 1 to 4 as a dopant of an emission layer.
6. An organic electroluminescent device using a green phosphorescent compound according to claim 5, wherein: the mass percentage of the dopant in the luminescent layer is 0.1-50%.
7. An organic electroluminescent device using a green phosphorescent compound according to claim 5, wherein: wherein any one of an Al metal complex, a Zn metal complex, and a carbazole derivative is used as a host material of the light-emitting layer.
8. An organic electroluminescent device using a green phosphorescent compound according to claim 7, wherein: the ligands of the Al metal complex and the Zn metal complex comprise quinolyl, biphenyl, isoquinolyl, phenyl, methylquinolyl, dimethylquinolyl and dimethylisoquinolyl; carbazole derivatives include CBP.
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