Calcium-tributylphosphine oxide passivation enables the efficiency of pure-blue perovskite light-emitting diode up to 3.3%  

纯蓝光钙钛矿发光二极管外量子效率达3.3%:三丁基氧膦-钙离子复合配体钝化新策略

作　　者：Jisong Yao Li Wang Kunhua Wang Yichen Yin Junnan Yang Qun Zhang Hongbin Yao 姚纪松;王俐;王坤华;殷逸臣;杨俊楠;张群;姚宏斌(Hefei National Laboratory for Physical Sciences at the Microscale,University of Science and Technology of China,Hefei 230026,China;Department of Applied Chemistry,Hefei Science Center of Chinese Academy of Sciences,University of Science and Technology of China,Hefei 230026,China;Department of Chemical Physics,Synergetic Innovation Center of Quantum Information and Quantum Physics,University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]Hefei National Laboratory for Physical Sciences at the Microscale,University of Science and Technology of China,Hefei 230026,China [2]Department of Applied Chemistry,Hefei Science Center of Chinese Academy of Sciences,University of Science and Technology of China,Hefei 230026,China [3]Department of Chemical Physics,Synergetic Innovation Center of Quantum Information and Quantum Physics,University of Science and Technology of China,Hefei 230026,China

出　　处：《Science Bulletin》2020年第14期1150-1153,M0003,共5页科学通报（英文版）

基　　金：We acknowledge the financial support from the National Natural Science Foundation of China(51571184,21501165,21875236,21573211,21633007);the National Key R&D Program on Nano Science and Technology(2016YFA0200602,2018YFA0208702);the Fundamental Research Funds for the Central Universities(WK2060190085);the Joint Funds from Hefei National Synchrotron Radiation Laboratory(KY2060000111);the Anhui Initiative in Quantum Information Technologies(AHY090200);We also thank the support from the USTC Center for Micro and Nanoscale Research and Fabrication.

摘　　要：Metal halide perovskites are attractive for light-emitting diodes due to their superior optoelectronic properties such as tunable bandgaps,high photoluminescence quantum yields(PLQYs),high color purities and solution processability[1–6].In the past several years,impressive progress has been made in perovskite light-emitting diodes(PeLEDs)via microstructure engineering[7],charge balancing[8],surface defect passivation[9,10],metal ion doping[11,12]and dimensional engineering[13].As such,the green,red and near-infrared PeLEDs have achieved impressive external quantum efficiencies(EQEs)exceeding 20%[7,8,14,15].However,the performances of pure-blue PeLEDs,i.e.,brightness and EQEs,still lag largely behind those of the green and red counterparts,which severely impedes the PeLED application in full-color display and solid-state lighting.金属卤素钙钛矿材料因其高荧光效率、高色纯度、光谱易调节以及低制备成本等优点在发光二极管器件应用中受到极大关注.近年来,绿光、红光、近红外光发射的金属卤素钙钛矿发光二极管器件的外量子效率均已超过20%,然而纯蓝光金属卤素钙钛矿二极管器件的效率仍很低(2%左右),这是由于纯蓝光金属卤素钙钛矿纳米晶中深的空位缺陷和表面绝缘的长链有机配体阻碍了其在发光器件中的效率提升.本文报道一种新型的三丁基氧膦-钙离子复合物配体表面处理策略来减少纯蓝光钙钛矿纳米晶表面固有的卤素空位缺陷,同时取代原有的长链有机配体(油酸、油胺等),使得纳米晶的荧光效率超过90%,同时提升了薄膜中的载流子传输能力.基于三丁基氧膦-钙离子复合物对纯蓝光钙钛矿纳米晶表面钝化的优化工程,制备得到的纯蓝光钙钛矿发光二极管器件的外量子效率达到了3.3%.

关 键 词：发光二极管 外量子效率 发光器件 载流子传输 表面钝化 荧光效率 空位缺陷 钙钛矿 

分 类 号：TN312.8[电子电信—物理电子学]