Alcohol‐Soluble Electron‐Transport Materials for Fully Solution‐Processed Green PhOLEDs |
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| Authors: | Fudong Chen Prof Shirong Wang Prof Yin Xiao Feng Peng Nonglin Zhou Dr Lei Ying Prof Xianggao Li |
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| Institution: | 1. School of Chemical Engineering and Technology, Tianjin University, Tianjin, P.?R. China;2. Collaborative Innovation Center of Chemical Science and Engineering, Tianjin, P.?R. China;3. Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, P.?R. China |
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| Abstract: | Two alcohol‐soluble electron‐transport materials (ETMs), diphenyl(4‐(1‐phenyl‐1H‐benzod]imidazol‐2‐yl)phenyl)phosphine oxide (pPBIPO) and (3,5‐bis(1‐phenyl‐1H‐benzod]imidazol‐2‐yl)phenyl)diphenylphosphine oxide (mBPBIPO), have been synthesized. The physical properties of these ETMs were investigated and they both exhibited high electron‐transport mobilities (1.67×10?4 and 2.15×10?4 cm2 V?1 s?1), high glass‐transition temperatures (81 and 110 °C), and low LUMO energy levels (?2.87 and ?2.82 eV, respectively). The solubility of PBIPO in n‐butyl alcohol was more than 20 mg mL?1, which meets the requirement for fully solution‐processed organic light‐emitting diodes (OLEDs). Fully solution‐processed green‐phosphorescent OLEDs were fabricated by using alcohol‐soluble PBIPO as electron‐transport layers (ETLs), and they exhibited high current efficiencies, power efficiencies, and external quantum efficiencies of up to 38.43 cd A?1, 26.64 lm W?1, and 10.87 %, respectively. Compared with devices that did not contain PBIPO as an ETM, the performance of these devices was much improved, which indicated the excellent electron‐transport properties of PBIPO. |
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| Keywords: | electron-transport materials light-emitting diodes materials science nitrogen heterocycles phosphorescence |
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