期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 29, 页码 26152-26164出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b06749
关键词
deep red; organic light-emitting devices (OLEDs); asymmetric iridium(III) complexes; thianthrene 5,5,10,10-tetraoxide; solution processed
资金
- National Natural Science Foundation of China [51803163, 21572176, 21602170, 21875179]
- China Postdoctoral Science Foundation [2015M580831, 2016M600778]
- Shaanxi Province Postdoctoral Science Foundation [2017BSHYDZZ02, 2017BSHEDZZ03]
- Fundamental Research Funds for the Central Universities [xjj2017099, xjj2016061, cxtd2015003]
- Key Laboratory Construction Program of Xi'an Municipal Bureau of Science and Technology [201805056ZD7CG40]
Highly efficient deep-red organic light-emitting devices (OLEDs) are indispensable for developing high-performance red-green-blue (RGB) displays and white OLEDs (WOLEDs). However, the shortage of deep-red emitters with high photoluminescence quantum yields (PLQYs) and balanced charge injection/transport abilities has severely restricted the performance of deep-red OLEDs. Herein, we design and synthesize four efficient emitters by combining the isoquinoline group with the thianthrene 5,5,10,10-tetraoxide group. Benefited from the introduction of the thianthrene 5,5,10,10-tetraoxide group, these Ir(III) complexes show improved electron-injection/-transport abilities. By enhancing the contribution of the triplet metal-to-ligand charge transfer ((MLCT)-M-3) in emissions, the asymmetric configuration endows the related deep-red Ir(III) complexes with high PLQYs of 0.45-0.50 in solutions. More importantly, PLQYs of these Ir(III) complexes in doped host films increase up to 0.91, which is much higher than PLQYs reported for conventional deep-red Ir(III) complexes with impressive electroluminescent performance. As a result, solution-processed OLEDs based on these Ir(III) complexes exhibit deep-red emissions with Commission Internationale de L'Eclairage (CIE x, y) coordinates very close to the National Television System Committee (NTSC)-recommended standard red CIE coordinates of (0.67, 0.33). Furthermore, a deep-red OLED using the asymmetric Ir(III) complex SOIrOPh as the emitter shows outstanding performance with a peak external quantum efficiency (EQE) of 25.8%, which is the highest EQE reported for solution-processed deep-red OLEDs. This work sheds light on the great potential of utilizing the thianthrene 5,5,10,10-tetraoxide group to develop phosphorescent emitters for highly efficient OLEDs.
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