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Highly efficient phosphorescent iridium (III) diazine complexes for OLEDs: Different photophysical property between iridium (III) pyrazine complex and iridium (III) pyrimidine complex |
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| Authors: | Guoping Ge Haiqing Guo Fuzhi Wang |
| Affiliation: | a Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, 5 Yiheyuan Road, Haidian District, Beijing 100871, China b College of Materials Science and Technology, Beijing Forestry University, Beijing 100083, China c Key Laboratory of Polymer Chemistry and Physics of Education Ministry, Department of Polymer Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, 5 Yiheyuan Road, Haidian District, Beijing 100871, China |
| Abstract: | The synthesis and luminescence of four new iridium (III) diazine complexes (1-4) were investigated. HOMO and LUMO energy levels of the complexes were estimated according to the electrochemical performance and the UV-Vis absorption spectra, showing the pyrimidine complexes have a larger increase for the LUMO than the HOMO orbital in comparison with the pyrazine complexes. Several high-efficiency yellow and green OLEDs based on phosphorescent iridium (III) diazine complexes were obtained. The devices emitting yellow light based on 1 with turn-on voltage of 4.1 V exhibited an external quantum efficiency of 13.2% (power efficiency 20.3 lm/W), a maximum current efficiency of 37.3 cd/A. The electroluminescent performance for the green iridium pyrimidine complex of 3 is comparable to that of the iridium pyridine complex (PPY)2Ir(acac) (PPY = 2-phenylpyridine), which is among the best reported. |
| Keywords: | Phosphorescence Iridium diazine complex 3MLCT OLED |
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