稀土有机聚合物EL进展及其若干问题

Development and Some Problems of Rare Earth Organic Polymer Electroluminescence

描述近年来稀土有机聚合物EL研究进展状况 ,如稀土Dy 和双核稀土配合物的白光发射EL器件的探索 ,高效窄带发射长寿命Eu 的红色EL特性研究以及新型Tm 蓝色EL器件的研究 ,新型Er ,Tm等红外发射EL器件的研究等等。结合国内外的研究 ,提出了有关稀土有机聚合物EL存在的若干问题 ,如大电流下工作易于老化的问题 ,发光亮度仍然不太高和驱动寿命短的问题等。

The developments in rare earth organic/polymer electroluminescence(EL)were described.Since the studies of RE OEL were reported in 1990 by Kido et al,the study in this field has made a progress rapidly.In our group,the studies on organic/polymer EL based on RE complexes,such as white electroluminescence based on Dy complex and Eu Tb double nuclear complexes,Eu red electroluminescence with higher efficiency and long lifetime were carried out,and phenomena of electronic transition from 5D 0 7 F 1 at 596nm of a new EL based on Eu polymer complex were observed.The efficiency and durability of OEL devices based on Eu complex improved intensively,and the efficiency is about 4 6% which exceeded the theoretical limit,and the lifetime(the decaying time from 100cd/m 2 to 50cd/m 2)is the highest so far.Either blue EL or IR EL emissions based on Tm complexes could be observed when the ligand changed.On the other hand,new IR emission and I V characteristics of OEL devices based on Yb,Er and Nb complexes were studied too.Finally some problems existed in RE OEL were discussed in which the luminance and durability should be improved,and new RE complexes with stable structure and good film forming properties must be carried out.The foreground for color displays is prospected.