Degradation mechanism of phosphorescent-dye-doped polymer light-emitting diodes

Shun Chi Chang, Gufeng He, Fang Chung Chen, Tzung Fang Guo, Yang Yang

研究成果: Article同行評審

112 引文 斯高帕斯(Scopus)

摘要

The degradation mechanism of phosphorescent-dye-doped polymer light-emitting diodes (PLEDs) is investigated. The active medium of our PLED is a polymer blend comprising poly(vinylcarbazole) (PVK), [2-(4-biphenylyl)-5-(4-tert-butyl-phenyl)-1,3,4-oxadiazole] (t-PBD), and platinum(II)-2,8,12,17-tetraethyl-3,7,13,18-tetramethylporphyrin (PtOX). The cyclic voltammetry result shows that the reductive reversibility of PtOX is poor. This result suggests that PLED doped with PtOX is not stable if PtOXs trap electrons and turn into anionic PtOX species. This was indeed verified by fabricating single-layer PLEDs with various amounts of electron-transporting material, t-PBD. A slower degradation rate was observed from the devices with higher concentration of t-PBD, because of the reduction of the electron accumulation at the PtOX sites. The half decay lifetime of our phosphorescent polymer LED has been improved by a factor of ∼40, from 1.2 to 45 h.

原文English
頁(從 - 到)2088-2090
頁數3
期刊Applied Physics Letters
79
發行號13
DOIs
出版狀態Published - 2001 九月 24

All Science Journal Classification (ASJC) codes

  • 物理與天文學(雜項)

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