Overcoming side reaction effects in the colloidal synthesis of ZnSe/ZnS core/shell quantum dots with an etching strategy  

作　　者：Jinhua He Chenhui Wang Mingrui Liu Muhammad Ramzan Zhiwei Long Xian-gang Wu Yu Chen Haizheng Zhong 

机构地区：[1]MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices,School of Materials Science and Engineering,Beijing Institute of Technology,Beijing 100081,China [2]Beijing Engineering Research Center for Mixed Reality and Advanced Display Technology,School of Optics and Photonics,Beijing Institute of Technology,Beijing 100081,China

出　　处：《Nano Research》2024年第8期7020-7026,共7页纳米研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.U23A20683);the Beijing Natural Science Foundation(No.Z210018).

摘　　要：The potential use of large-size ZnSe quantum dots as blue emitters for display applications has greatly inspired the colloidal synthesis.Herein,we report the negative effects of side reactions of large-size ZnSe quantum dots.The side reactions between oleic acid and oleylamine generated amidation products and H_(2)O,which led to the hydrolysis of Zn(OA)2 to Zn(OH)2 and the subsequent formation of zinc oxide(ZnO)and zinc bis[diphenylphosphinate](Zn(DPPA)2)precipitates.These side reactions resulted in the formation of a defective surface including a Se-rich surface and oxygen-related defects.Such negative effects can be overcome by adopting an etching strategy using potassium fluoride and myristic acid in combination.By overcoating a ZnS shell,blue emissive ZnSe/ZnS quantum dots with a maximum photoluminescence quantum yield of up to 91%were obtained.We further fabricated ZnSe quantum dots-based blue light-emitting diodes with an emission peak at 456 nm.The device showed a turn-on voltage of 2.7 V with a maximum external quantum efficiency of 4.2%and a maximum luminance of 1223 cd·m^(−2).

关 键 词：quantum dots ZNSE side reactions surface etching light-emitting diodes 

分 类 号：O62[理学—有机化学]