摘要
有机电致发光材料与器件的研究已取得了重要进展,但要实现高信息含量的应用,器件的稳定性和效率仍须进一步提高。基于量子统计理论的研究结果表明,只有25％的电子空穴复合能量生成单线态激子,对于一个纯荧光的发光材料,在理论上,其器件效率的上限是先致发光效率的25％。三线态发光材料的应用,理论上可有效利用所有的复合能量,从而大幅度提高器件效率,目前已成为有机电致发光领域的研究热点。综述了有机三线态电致发光材料与器件的进展。
Organic electroluminescent devices have been greatly improved in the past several years. Although device stability and efficiency need to be further improved for high-end applications,these obstacles can be solved by developing new materials. There exists a generally accepted observation that the efficiency is limited to 25% of that of photoluminescence, based simply on the statistics of spin multiplicity, for recombination of pair of electron and hole (both spin 1/2) .there are four micro-states,including,three triplet states and one singlet state. Thus using the materials with triplet excited state as emitting layer could increase the theoretical upper limit on the internal quantum efficiency from 25% to 100%. In this paper we present an overview of the materials and device properties of triplet excited states for electroluminescence.
出处
《材料导报》
EI
CAS
CSCD
2001年第1期8-10,共3页
Materials Reports
基金
国家自然科学基金 批准号:597905006
