发光学报2025，Vol.46Issue(5)：743-752,10.DOI:10.37188/CJL.20240344
ZnO量子点多重混合自陷域激子发光与应用
ZnO QDs with Multiple Hybrid Self-trapping Excitons Emission and Application
摘要
Abstract
The emission of ZnO in the visible light region has a long and complicated history.In previous studies,researchers have attributed the emissions in the visible light region to the existence of impurities or structural defects(such as oxygen vacancies,zinc vacancies,zinc interstitials,surface states).However,there are still certain differ-ences.For quantum dots(QDs)with good crystallinity and high luminous efficiency,it is contradictory to attribute their emission mechanism in the visible light region to the defect model.This paper proposes a multiple bright singlet/triplet hybrid self-trapped exciton emission model for ZnO QDs,whose luminescence range covers from 400 nm to 700 nm.The Photoluminescence quantum yield(PLQY)of singlet exciton and triplet exciton emission are 45.56％and 22.44％,respectively.Thanks to their good transparency and bright triplet excitons,we have explored the X-ray detection imaging by ZnO QDs as scintillator.The lowest detection limit of the ZnO QD scintillator for X-ray is as low as 64.89 nGy/s,which is lower than the dose required for X-ray medical imaging.This work puts forward a new mod-el for visible emission in ZnO QDs,demonstrating a new type of transparent scintillator and their potential applica-tion in X-ray imaging.关键词
ZnO量子点/自陷域激子/单重态/三重态/X射线成像Key words
ZnO QDs/self-trapped excitons/singlet/triplet/X-ray imaging分类
物理学引用本文复制引用
郜梦迪,曹庆,宋世玉,刘凯凯,单崇新..ZnO量子点多重混合自陷域激子发光与应用[J].发光学报,2025,46(5):743-752,10.基金项目
国家自然科学基金面上项目(12474413) Supported by National Natural Science Foundation of China(12474413) （12474413）
