壳层生长速率调控实现高效率蓝光量子点

打开文本图片集

关键词：CdZnS/ZnS量子点；前驱体注人速率；壳层生长动力学；发光性能中图分类号：0482.31 文献标识码：ADOI：10.37188/CJL.20250037 CSTR：32170.14.CJL.20250037

High-efficiency Blue Quantum Dots Achieved Through Shell Growth Rate Regulation

SHEN Zhaoze 1 ，HUANG Feil*，LI Jiawei¹，YUBinbin1，WANGJunfeng'，NING Jiajia²，TIANJianjun 1∗ （1.InstituteforAdvancedMaterialsTechnology，UniversityofScienceandTechnologyBeijing，BeijingOoo83hina; 2.CollegeofPhysics，JilinUniversity，Changchun130o15，China） * Corresponding Authors，E-mail：huangfei@ustb.edu.cn；tianjianjun@mater.ustb.edu.cn

Abstract：Quantumdots（QDs）exhibit high photoluminescence quantum yield（PLQY），high color purity，and solutionprocessability，makingthemwidelyappliedinthefieldof lightinganddisplays.However，achieving high-efciency andstable blueQDsand theirdevicesremains asignificant chalenge.Inthis work，CdZnS/ZnScore-shellstructure blue QDs were investigated，withoctanethiol（OT）as thesulfur precursorforshel growth.Theshellgrowth rate was tuned by controlingthe injectionrateofOT，enabling controlldepitaxial growth.The impactofshell growthrateonshellquality andthe photoluminescence performance of CdZnS/ZnS QDs was systematicallanalyzed through testing methods such as transmission electron microscopyandtransient/steady-statefluorescencespectroscopy.Theresultsshow thatmoderatelyreducing the growth rate effectively promotes uniform shell growth，achieving a high PLQY of 98 % and a narrow full width at half maximum（FWHM）of 22nm.However，excessively slowgrowth rates result inanisotropic shellgrowth，accompaniedbytheKirkendall efect，resulting inalarge numberof lattce defects thatreduce the photoluminescence performance.This work deepens the understanding of how growth rate affects the quality of QDs shell growth.

Keywords：CdZnS/ZnS quantumdots;precursor injectionrate；shellgrowthdynamic;photoluminescence performance

1引言

量子点（QDs）具有发光波长可调、荧光量子产率（PLQY）高、色纯度高等优异的光学性能，在发光显示领域具有广阔的应用前景14]。（剩余14719字）