Hole-transporting small molecules as a mixed host for efficient solution processed green phosphorescent organic light emitting diodes
| Autor: | Lu Lian, Dongxu Feng, Bingwu Wei, Jing-Cheng Xia, Xinkai Wu, You-Xuan Zheng, Dan Dong, Shuai Yang, Gufeng He |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
business.industry Exciton 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Small molecule Luminance 0104 chemical sciences Electronic Optical and Magnetic Materials Biomaterials Materials Chemistry OLED Optoelectronics Charge carrier Electrical and Electronic Engineering 0210 nano-technology business Phosphorescence Host (network) Voltage |
| Zdroj: | Organic Electronics. 38:29-34 |
| ISSN: | 1566-1199 |
| DOI: | 10.1016/j.orgel.2016.07.031 |
| Popis: | We have demonstrated highly efficient and reduced efficiency roll-off solution processed green phosphorescent organic light emitting diodes (OLEDs) utilizing two hole-transporting small molecular materials of 1,3-bis(carbazol-9-yl)benzene (mCP) and 4,4′,4″-tris( N -carbazolyl)-triphenylamine (TCTA) as a mixed host. Compared with the corresponding two single host devices, the mixed host one shows a superior overall performance. A low driving voltage of 5.5 V at 1000 cd/m 2 with a current efficiency of 39.5 cd/A is achieved in the mCP:TCTA (3:1) mixed host device. Even at the luminance of 10000 cd/m 2 , the efficiency still reaches 28.6 cd/A. The enhanced charge carrier balance and broadened exciton recombination zone due to the mixed host contribute to the improvement of efficiency and efficiency roll-off. |
| Databáze: | OpenAIRE |
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