Highly efficient solution-processed pure yellow OLEDs based on dinuclear Pt(ii ) complexes
| Autor: | Yue Guo, Guijiang Zhou, Zhao Chen, Xi Chen, Xiaolong Yang, Yuanhui Sun, Bochen Liu, Bo Jiao |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Photoluminescence Doping 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences 0104 chemical sciences Solution processed Excited state Materials Chemistry OLED General Materials Science Quantum efficiency Solubility 0210 nano-technology Phosphorescence |
| Zdroj: | Materials Chemistry Frontiers. 5:5698-5705 |
| ISSN: | 2052-1537 |
| Popis: | Pure yellow light is very important in monochromatic lighting and signal systems. However, there are very few efficient yellow phosphorescent complexes for solution-processed OLEDs. Here, we report two thermally stable dinuclear Pt(II) complexes decorated with diphenylsulfone and arylboron groups. The two functional groups have little contribution to the lowest excited states but are significantly involved in the closely located higher lying excited states. The resultant complexes show pure yellow emissions with impressively high photoluminescence quantum efficiencies close to 0.9 in doped films. Besides, the solubility is improved due to the bulky substituents. Therefore, these dinuclear Pt(II) complexes are employed to fabricate solution-processed OLEDs. All devices display pure yellow emission with Commission Internationale de L’Eclairage (CIE) coordinates around (0.44, 0.55). Furthermore, the 2 wt% doped devices achieve excellent performance with an external quantum efficiency of 21.54% and a current efficiency of 76.64 cd A−1, which are among the highest efficiencies reported for solution-processed yellow phosphorescent OLEDs. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|