Investigating in novel CdZnSe/CdSe/CdZnSe quantum well with 97% PLQY

Thick-shell not only provides colloidal quantum dots (QDs) stability and workability, but also plays a significant role in passivation of QDs surface defects and change of electron transport characteristics of QDs. Here, the dedicated design and synthesis of high luminescence CdZnSe/CdSe/CdZnSe quan...

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Published inModern physics letters. B, Condensed matter physics, statistical physics, applied physics Vol. 34; no. 21; p. 2050222
Main Authors Zou, Shi-Bing, Fan, Hao, Yang, Hao, Feng, Lu-Xin, Duan, Jun-Hong, Liu, Wei-Qing, Wu, Hua-Ming
Format Journal Article
LanguageEnglish
Published Singapore World Scientific Publishing Company 30.07.2020
World Scientific Publishing Co. Pte., Ltd
Subjects
Cadmium selenides
Core-shell structure
Electron transport
Monolayers
Optical properties
Photoluminescence
Quantum dots
Quantum wells
Shells
Surface defects
Thickness
Transport properties
Workability
CdZnSe/CdSe/CdZnSe
photoluminescence quantum yield
quantum wells
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Summary:Thick-shell not only provides colloidal quantum dots (QDs) stability and workability, but also plays a significant role in passivation of QDs surface defects and change of electron transport characteristics of QDs. Here, the dedicated design and synthesis of high luminescence CdZnSe/CdSe/CdZnSe quantum wells are reported by precisely controlled shell growth. By tuning the thicknesses of the CdSe and CdZnSe layers, photoluminescence quantum yields (PLQY) can be attained a maximum of 97% as the CdSe shell thickness is 4 monolayers and the CdZnSe shell thickness is 10 monolayers. These gradient thick shell CdZnSe/CdSe/CdZnSe quantum wells confirm the suppression of surface trap-state emission in gradient core/shell structures. Superior optical properties render CdZnSe/CdSe/CdZnSe quantum wells suitable for use in solid-state lightings.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 14
ISSN:0217-9849
1793-6640
DOI:10.1142/S021798492050222X