Optical Properties of Ultraviolet Quantum Dot Light-Emitting Devices Using ZnO-Cores With a MgO-Shell

Author

Wen-Jian Kuang ; Qing Li ; Jiang-Yong Pan ; Xiang Liu ; Dong-Ping Li ; Jing Chen ; Tolner, Harm

Author_Institution

Display R&D Center, Southeast Univ., Nanjing, China

Volume

11

Issue

5

fYear

2015

fDate

May-15

Firstpage

461

Lastpage

465

Abstract

Colloidal quantum dots (QDs) with a ZnO core were synthesized with subsequent surface passivation by MgO. The photo-enhancement effect of the near band-edge photoluminescence (PL) in ZnO nanocrystals, dispersed in ethanol, is investigated by observing changes in the optical properties after ultraviolet (UV) exposure. Finally, the operation as a light-emitting device (LED) was demonstrated experimentally for these ZnO-based quantum dots (QDs). The results indicate that this type of QDs might enable the development of electroluminescent UV sources in the near future.

Keywords

II-VI semiconductors; core-shell nanostructures; light emitting devices; magnesium compounds; passivation; photoluminescence; semiconductor quantum dots; wide band gap semiconductors; zinc compounds; MgO; MgO-shell; ZnO; ZnO-cores; colloidal quantum dots; ethanol; nanocrystals; near band-edge photoluminescence; optical properties; photo-enhancement effect; surface passivation; ultraviolet exposure; ultraviolet quantum dot light-emitting devices; Absorption; Ethanol; Excitons; Photoluminescence; Photonic band gap; Zinc oxide; Electroluminescent; MgO; ZnO; nanocrystals; photoluminescence (PL); quantum dots (QDs); ultraviolet (UV);

fLanguage

English

Journal_Title

Display Technology, Journal of

Publisher

ieee

ISSN

1551-319X

Type

jour

DOI

10.1109/JDT.2015.2397472

Filename

7024908