High efficiency yellow organic light-emitting diodes with a solution-processed molecular host-based emissive layer
| Autor: | Cheng-I. Chiang, Sun-Zen Chen, Jung-Yu Li, Yu-Lin Chen, Chieh-Ju Li, Shiang-Hau Peng, Ming-Chung Liu, Shih-Ming Shen, Yung-Cheng Jou, Yi-Ping Lin, Jwo-Huei Jou, Hsiao-Wen Hung, Young-Shan Sun, Ching-Wu Wang, Cheng-Hua Chen, You-Xing Lin, Wei-Ben Wang, Mao-Kuo Wei |
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| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | Journal of Materials Chemistry C. 1:1680 |
| ISSN: | 2050-7534 2050-7526 |
| DOI: | 10.1039/c2tc00249c |
| Popis: | Highly efficient yellow organic light-emitting diodes (OLEDs) with a solution-process feasible emissive layer were fabricated by simply using molecular hosts doped with an iridium-complex based yellow emitter. The best yellow OLED device studied here showed for example, at 100 cd m−2, a power efficiency of 32 lm W−1, a 113% improvement compared with the prior record of 15 lm W−1 based on the same emitter with a polymeric host. The marked efficiency improvement may be attributed to the device being composed of an electron-injection-barrier free architecture, a device structure that led the excitons to generate preferably on the host to enable the efficiency-effective host-to-guest energy transfer to occur and the employed molecular host that exhibited a good host-to-guest energy transfer. The efficiencies were further improved to 53, 39 and 14 lm W−1 at 100, 1000 and 10 000 cd m−2, respectively, with the use of a micro-lens. This study also demonstrates the possibility of achieving relatively high device efficiency for wet-processed OLED devices via balancing the injection of carriers with commercially available OLED materials and limited designs in device structure. |
| Databáze: | OpenAIRE |
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