- Iridium complex with picolinic acid as auxiliary ligand and application
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The invention belongs to the technical field of electroluminescent materials, and relates to a novel iridium complex. A main ligand of the iridium complex contains dibenzoheterocycle or aza-dibenzoheterocycle and an auxiliary ligand of the iridium complex is picolinic acid or a derivative thereof. The dibenzoheterocycle or aza-dibenzoheterocycle in the iridium complex molecule is helpful for regulating and controlling the luminescent color of the material, and is helpful for improving the stability of the material. The iridium complex disclosed by the invention is high in preparation yield, high in purity, easy to sublimate and purify and relatively high in luminous efficiency, and a device prepared by using the iridium complex as a luminous material is excellent in performance.
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Paragraph 0050-0052
(2021/07/17)
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- Synthesis, characterization, and photoelectric properties of iridium(iii) complexes containing an N hetero-dibenzofuran C^N ligand
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In this study, three high-efficient green light iridium(iii) complexes were designed and synthesized, wherein 2-methyl-8-(2-pyridine) benzofuran [2,3-B] pyridine (MPBFP) is the main ligand and three β-diketone derivatives, namely 3,7-diethyl-4,6-nondiazone (detd), 2,2,6,6-tetramethyl-3,5-heptyldione (tmd) and acetylacetone (acac), are ancillary ligands. The thermal stabilities, electrochemical properties, and electroluminescence (EL) performance of these three complexes, namely (MPBFP)2Ir(detd), (MPBFP)2Ir(tmd) and (MPBFP)2Ir(acac), were investigated. The results show that the absorption peaks of the three complexes range from 260 to 340 nm, and the maximum emission wavelengths are 537 nm, 544 nm and 540 nm, respectively. The LUMO level is ?2.18 eV, ?2.20 eV, ?2.21 eV, and the HOMO level is ?5.30 eV, ?5.25 eV, and ?5.25 eV, respectively. The thermal decomposition temperatures of each of the three compounds are 359 °C, 389 °C and 410 °C respectively, with a weight loss of 5%. Green phosphorescent electroluminescent devices were prepared with the structure of ITO/HAT-CN/TAPC/TCTA/TCTA:X/Bepp2/LiF/Al, and the three complexes were dispersed in the organic light-emitting layer as the guest material X. The maximum external quantum efficiency of the devices is 17.2%, 16.7%, and 16.5%, respectively. The maximum brightness is 57?328 cd m?2, 69?267 cd m?2and 69?267 cd m?2, respectively. With respect to the EL properties, (MPBFP)2Ir(detd) is the best performer among the three complexes. The different performances exhibited by these complexes were discussed from the view point of substituent effect on the β-diketone ligands.
- Ma, Zequn,Jing, Chaojun,Hang, Deyu,Fan, Hongtao,Duan, Lumeng,Fang, Shuqing,Yan, Li
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p. 11004 - 11010
(2021/03/23)
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- Iridium complex with main ligand containing dibenzoheterocycle or aza-dibenzoheterocycle and application
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The invention belongs to the technical field of electroluminescent materials, and relates to a novel iridium complex with a main ligand containing dibenzoheterocycle or aza-dibenzoheterocycle and thiobis(diaryl)/heteroaryl phosphor imide as an auxiliary ligand. The dibenzoheterocycle or aza-dibenzoheterocycle and thiobis(diaryl)/heteroaryl phosphor imide in the iridium complex molecule are beneficial to regulation and control of the luminescent color of the material, increase of the stability of the material, improvement of the efficiency of the device and reduction of the roll-off of the efficiency. The iridium complex disclosed by the invention is easy to sublimate and purify, high in yield and high in color purity, and a prepared device is excellent in performance and has potential application value in the field of OLED illumination and display.
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Paragraph 0054-0056
(2021/07/17)
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- Green phosphorescent compound and organic electroluminescence device using green phosphorescent compound
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The invention discloses a green phosphorescent compound and an organic electroluminescence device using the green phosphorescent compound. The organic electroluminescence device comprises a positive electrode, a hole injection layer, a hole transmission layer, a luminescent layer, an electron transmission layer, an electron injection layer and a negative electrode in mutually and sequentially deposition; the organic electroluminescence device can use the green phosphorescent compound shown as a formula (I) shown in specification as a doping agent of a luminescent layer; n is 1 or 2. The greenphosphorescent material has the effects of high efficiency, high color purity and narrow optical spectrum.
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Paragraph 0086-0088
(2019/06/11)
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- Iridium complexes with aza-benzo fused ligands
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Novel iridium complexes containing phenylpyridine and pyridyl aza-benzo fused ligands are described. These complexes are useful as light emitters when incorporated into OLEDs.
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Paragraph 0157; 0158
(2014/05/24)
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