Highly efficient phosphorescent organic light-emitting diodes using a beryllium metal–chelate complex as electron-transporting host material |
| |
Authors: | Tai Peng Guofang Li Yu Liu Yu Yang Ling Wang Ying Wu Yue Wang |
| |
Affiliation: | State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun 130012, PR China |
| |
Abstract: | A classical fluorescent metal–chelate complex bis(2-(2-hydroxyphenyl)-pyridine)beryllium (Bepp2) has been used as an efficient electron-transporting host material to construct highly efficient phosphorescent organic light-emitting diodes (PHOLEDs) with an orange-emitting phosphorescent guest bis(7,8-benzoquinolinato) iridium (III) (N,N′-diisopropyl-benzamidine) ((bzq)2Ir(dipba)). Due to the well-matched energy levels of Bepp2 with the corresponding hole-/electron- transporting (HT/ET) materials and the high-efficiency and complete energy transfer of this host–guest system, the Bepp2-based PHOLEDs exhibit rather low driving voltage (2.8 V) and high peak EL efficiencies of over 70 cd A−1 for luminous efficiency, 55 lm W−1 for power efficiency, and 23% for external quantum efficiency, a performance significantly better than that using CBP as the host. |
| |
Keywords: | Phosphorescent organic light-emitting diodes Beryllium complex Electron-transporting host material |
本文献已被 ScienceDirect 等数据库收录! |