期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 4, 期 21, 页码 4709-4718出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6tc00856a
关键词
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资金
- National Key Basic Research Program of China (973 Program) [2014CB648300]
- National Natural Science Foundation of China [21422402, 20904024, 51173081, 61136003]
- Natural Science Foundation of Jiangsu Province [BK20140060, BK20130037, BM2012010]
- Program for Jiangsu Specially-Appointed Professors [RK030STP 15001]
- Program for New Century Excellent Talents in University [NCET-13-0872]
- Specialized Research Fund for the Doctoral Program of Higher Education [20133223110008, 20113223110005]
- Synergetic Innovation Center for Organic Electronics and Information Displays
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- NUPT 1311 Project''
- Six Talent Plan [2012XCL035]
- 333 Project [BRA2015374]
- Qing Lan Project of Jiangsu Province
A new highly efficient red-emitting Ir(III) complex, bis [9-(4-(2-ethylhexyloxy) phenyl)-3-(4-phenylquinolin-2-yl)-9H-carbazole] [3-(pyridin-2-yl) benzaldehyde] iridium(III) (Ir-CHO), has been synthesized and characterized to investigate the impact of the electron-withdrawing formyl group on the optoelectronic properties of the resulting Ir(III) complexes. For comparison, bis [9-(4-(2-ethylhexyloxy) phenyl)-3-(4-phenylquinolin-2-yl)-9H-carbazole] [(3-(pyridin-2-yl) phenyl) methanol] iridium(III) (Ir-OH) and fac-tris[9-(4-(2-ethylhexyloxy) phenyl)-3-(4-phenylquinolin-2-yl)-9H-carbazole] iridium(III) (Ir-PQCz) were also prepared. Remarkably, Ir-CHO-doped red organic light-emitting diodes (OLEDs) exhibited the highest performance, achieving a maximum luminance efficiency (LE) of 14.3 cd A(-1) and an external quantum efficiency (EQE) of 8.4%, which were better than those of Ir-OH-doped and Ir-PQCz-doped red OLEDs. The results can be attributed to the introduction of the electron-withdrawing formyl group, which improved the electron affinity in Ir-CHO and lowered the electron-injection barrier in OLEDs based on Ir-CHO. Similarly, white OLEDs (WOLEDs) with Ir-CHO as their red emitter demonstrated an excellent high LE of 26.1 cd A(-1) and an EQE of 10.9%. A combination of the thermal, photophysical, electrochemical and electroluminescence (EL) properties of these Ir(III) complexes can thus lead to a conclusion that the incorporation of the electron-withdrawing formyl-substituted phenylpyridine (ppy-CHO) can apparently improve the phosphorescence of the resulting red-emitting iridium complexes and thus the OLED performance. The results suggest a simple methodology for the rational design of efficient phosphorescent complexes for light-emitting applications.
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