Progress in next-generation organic electroluminescent materials:material design beyond exciton statistics

作     者：YAO Liang YANG Bing MA YuGuang 

作者机构：State Key Laboratory of Supramolecular Structure and Materials Jilin University State Key Laboratory of Luminescent Materials and Devices South China University of Technology 

出 版 物：《Science China Chemistry》 (中国科学（化学英文版）)

年 卷 期：2014年第57卷第3期

页      面：335-345页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：financially supported by the National Science Foundation of China(51073069,51273078) the National Basic Research Program of China(2013CB834801) 

主　　题：organic light-emitting device(OLED) exciton statistics reverse intersystem crossing(RISC) hybridized local and charge-transfer(HLCT) hot exciton 

摘      要：Exciton(or spin)statistics is a physical principle based on the statistics of spin *** electroluminescence,injected electrons and holes have randomized spin states,and usually form singlet or triplet excitons in the ratio of 1:*** statistics determines that the upper limit of internal quantum efficiency is 25%in fluorescent devices,since only singlet exciton can decay ***,both experimental and theoretical evidence indicate that the actual efficiency can exceed the exciton statistics limit of 25%by utilizing materials with special electronic structure and optimized device *** results bring light to break through the exciton statistics limit and develop new-generation fluorescent materials with low cost and high ***,the exciton statistics,which has attracted great attention in the past decade,is being rejuvenated due to the discovery of some fluorescent materials with abnormally high *** view of their significance in theoretical research of organic semiconductors and developing new-generation OLED materials,such materials are widely investigated in both academic institutions and *** key issues still require further clarification for this kind of materials,such as the molecular design ***,we review the progress of the materials with efficiency exceeding the exciton statistics limit,and the routes to improve exciton utilization *** the end,we present an innovative pathway to fully harvest the excitons in fluorescent devices,namely,hot excitonmodel and relevant fluorescence material with hybridized local and charge-transfer(HLCT)excited state.