| Title | Construction of High-Quality Cu(I) Complex-Based WOLEDs with Dual Emissive Layers Achieved by an "On-and-Off" Deposition Strategy |
| Authors | Li, Jiayi Li, Xiaoyue Tan, Yu Yu, Xiao Yuan, Fanglong Liu, Zhiwei Bian, Zugiang Jin, Qionghua Lu, Zhenghong Huang, Chunhui |
| Affiliation | Peking Univ, Coll Chem & Mol Engn, State Key Lab Rare Earth Mat Chem & Applicat, Beijing Engn Technol Res Ctr Act Display,BNLMS, Beijing 100871, Peoples R China Capital Normal Univ, Dept Chem, Beijing 100048, Peoples R China Univ Toronto, Dept Mat Sci & Engn, Toronto, ON M5G 3E4, Canada |
| Keywords | copper(I) complexes codeposition exciplex thermally activated delayed fluorescence WOLEDs |
| Issue Date | 2019 |
| Publisher | ADVANCED OPTICAL MATERIALS |
| Abstract | Inexpensive and highly luminescent Cu(I) complexes exhibit great potential as emitters in organic light-emitting diodes (OLEDs), especially in white OLEDs (WOLEDs). In this work, two compounds 9-(3-(quinolin-4-yl)phenyl)-9H-carbazole (CzPQ) and 9,9-(quinoline-4,6-diylbis(3,1-phenylene))bis(9H-carbazole) (2CzPQ) are designed and synthesized to form Cu(I) complexes in situ by codeposition with copper iodide (CuI). The corresponding OLEDs show an orange red emission with a maximum external quantum efficiency (EQE) of 6.7%. Based on this result, an on-and-off strategy is proposed to achieve WOLEDs with the combination of Cu(I) complex layer and the pure ligand layer by controlling the shutter of CuI source on and off. The optimized WOLEDs give a maximum EQE of 2.4% with excellent Commission Internationale de L'Eclairage (CIE) coordinates of (0.32, 0.33) and a remarkable color-rendering index (CRI) of 94. It can be forecasted that the device efficiency would be improved by tuning the chemical structure of the ligand. |
| URI | http://hdl.handle.net/20.500.11897/548533 |
| ISSN | 2195-1071 |
| DOI | 10.1002/adom.201801612 |
| Indexed | SCI(E) EI |
| Appears in Collections: | å å¦ä¸ å å å·¥ç¨ å¦é ¢ 稀土材料化学与应用国家重点实验室 |
