项目名称： 表面配体选择对量子点电致发光器件中的电荷注入及发光效率影响研究

项目编号： No.61504040

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 无线电电子学、电信技术

项目作者： 王洪哲

作者单位： 河南大学

项目金额： 20万元

中文摘要： 电荷注入效率的提高是改善荧光量子点的薄膜电致发光器件性能的关键因素之一。而发光层的电荷注入效率无疑是影响发光效率的重中之重。目前，荧光量子点合成过程中所广泛采用的长链有机表面配体构成了发光层电荷注入的主要障碍。本研究拟采用导电性能优异的新型无机及短链有机配体对核壳结构的CdSe/ZnS及ZnxCd1-xSe/ZnS量子点开展可控的表面配体取代并进行相应的器件制备测试，在亮度及效率等关键参数上开展与使用长链有机配体的量子点发光器件的对比测试及分析；在此基础上，通过引入开尔文探针系统来进一步探究配体交换所引起的界面势垒变化及其与器件性能之间的相互关系。该课题的开展将有助于我们更好的理解不同类型表面配体对电荷注入过程及器件性能的影响，从而更加清晰地理解其内在发光机制，为下一步的器件设计及应用研究提供有益的理论和实验参考。

中文关键词： 表面配体；量子点；电致发光；亮度；发光效率

英文摘要： The carrier injection efficiency is one of the key factors of performance improvement of quantum dot light-emitting devices (QD-LEDs). Meanwhile,the injection efficiency of carriers into emissive layer is of the highest priority. For now, long-chain organic surface capping ligands, which were widely used during the synthesis of luminescent quantum dots (QDs), form major barriers for the efficient injection of carriers into the emissive layer. This study comprises researches of controllable replacement of long-chain organic surface capping ligand of core-shell structured QDs with excellent conductive new type of ligands including inorganic complexes and short-chain organic ligands. Comparison and analysis of differences in performances of luminance and efficiency of QD-LEDs using CdSe/ZnS and ZnxCd1-xSe/ZnS QDs with different type of capping ligands would be conducted extensively. Furthermore, Kelvin probe technique will be introduced to study the relationship between the performance of QD-LEDs and the variation in interface barriers aroused by the ligand exchange. Such researches can help us to get a better understanding of the effects of different kinds of surface ligands on the charge injection process and device performance and to know more clearly about the mechanism for such QD-based electroluminescence, which will offer useful theoretical and technical references for further optimization of device structures and applied researches.

英文关键词： Capping ligand;Quantum dot;Electroluminescence;Luminance;Luminous efficiency