热激活延迟荧光材料的分子设计与性能研究
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- 英文论文题名：Molecular Engineering of Thermally Activated Delayed Fluorescence Emitters for OLEDs with High Efficiency and Slow Efficiency Roll-Off
- 论文作者：龚少龙 ; 詹丽思 ; 吴凯龙 ; 江楠 ; 吕正红 ; 杨楚罗
- 英文论文作者：Shaolong Gong ; Lisi Zhan ; Kailong Wu ; Nan Jiang ; Zheng-Hong Lu ; Chuluo Yang ; Hubei Key Lab on Organic and Polymeric Optoelectronic Materials ; Department of Chemistry ; Wuhan University ; Department of Physics ; Yunnan University
- 年：2016
- 作者机构：武汉大学化学与分子科学学院湖北省有机/高分子光电功能材料重点实验室;云南大学物理学院;
- 论文关键词：有机电致发光器件 ; 热激活延迟荧光 ; 光电特性的优化
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第二十一分会：π-共轭材料
- 语种：中文
- 分类号：TQ422;TN383.1
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：63k
- 原文格式：O
- 会议级别：全国
摘要
最近,热激活延迟荧光材料由于其高的激子利用率获得了众多研究者的广泛关注。这类材料通过吸热的反向系间穿越将占激子总量75%的三重态激子转变为单重态激子,发出延迟荧光,使得理论上激子利用率可高达100%~([1])。尽管基于这类材料的电致发光器件获得了与重金属磷光材料相近的器件性能,但是其器件性能和稳定性有待于进一步提升,并且其分子结构与性能的关系需要更加深入地探讨。基于一些新型的电子给体单元,我们构筑了一系列热激活延迟荧光客体材料。这些材料都具有小的单-三重态分裂能,显著的热激活延迟荧光特性,高的光致发光量子产率和合适的延迟荧光寿命。通过对分子结构的调节,我们可以调控这些材料的发光特性、热力学性能和能级,最终优化其光电特性。基于这些发光材料,我们构筑了一系列高效率、低衰减的荧光电致发光器件。其中,光电特性最优化的热激活延迟荧光客体分子获得的最大外量子效率接近25%,是目前报道的荧光电致发光器件的最高值之一。
Recently thermally activated delayed fluorescence(TADF) emitters have emerged as the most promising emissive materials following the great success of phosphorescent heavy-metal complexes.Although promising results have been achieved on TADF emitters with state-of-art external quantum efficiencies(EQEs) close to those of phosphorescent OLEDs,further improvement in the device efficiency and stability is still in demand,and the insight into the relationship between the TADF molecular structures and properties is to be deepened.Herein,we present a series of novel TADF emitters based on some electron-acceptor units.The resulting emitters exhibit small singlet-triplet energy splitting,obvious TADF feature,high PLQYs and suitable DF lifetimes.Changing substituent can finely tune their emissive characteristics,thermal properties and energy levels,and thereby optimize their optoelectronic properties.Employing these TADF emitters results in a green fluorescent OLEDs that exhibits a peak EQE close to 25%and a slow efficiency roll-off characteristic at high luminance.
Recently thermally activated delayed fluorescence(TADF) emitters have emerged as the most promising emissive materials following the great success of phosphorescent heavy-metal complexes.Although promising results have been achieved on TADF emitters with state-of-art external quantum efficiencies(EQEs) close to those of phosphorescent OLEDs,further improvement in the device efficiency and stability is still in demand,and the insight into the relationship between the TADF molecular structures and properties is to be deepened.Herein,we present a series of novel TADF emitters based on some electron-acceptor units.The resulting emitters exhibit small singlet-triplet energy splitting,obvious TADF feature,high PLQYs and suitable DF lifetimes.Changing substituent can finely tune their emissive characteristics,thermal properties and energy levels,and thereby optimize their optoelectronic properties.Employing these TADF emitters results in a green fluorescent OLEDs that exhibits a peak EQE close to 25%and a slow efficiency roll-off characteristic at high luminance.
引文
[1]a)Uoyama,H.;Goushi,K.;Shizu,K.;Nomura H.;Adachi,C.Nature 2012,492:234;b)Hirata,S.;Sakai,Y;Masui,K.;Tanaka,H.;Lee,S.Y;Nomura,H.;Nakamura,N.;Yasumatsu,M.;Nakanotani,H.;Zhang,Q.;Shizu,K.;Miyazaki,H.;Adachi,C.Nature Mater.2015,14:685;c)Tao,Y.;Yuan,K.;Chen,T.;Xu,P.;Li,H.;Chen,R.;Zheng,C;Zhang,L.;Huang,W.Adv.Mater.2014,26:7931.