Issue 4, 2023

InP/ZnS quantum dot photoluminescence modulation via in situ H2S interface engineering

Abstract

InP quantum dots (QDs) are attracting significant interest as a potentially less toxic alternative to Cd-based QDs in many research areas. Although InP-based core/shell QDs with excellent photoluminescence properties have been reported so far, sophisticated interface treatment to eliminate defects is often necessary. Herein, using aminophosphine as a seeding source of phosphorus, we find that H2S can be efficiently generated from the reaction between a thiol and an alkylamine at high temperatures. Apart from general comprehension that H2S acts as a S precursor, it is revealed that with core etching by H2S, the interface between InP and ZnS can be reconstructed with S2− incorporation. Such a transition layer can reduce inherent defects at the interface, resulting in significant photoluminescence (PL) enhancement. Meanwhile, the size of the InP core could be further controlled by H2S etching, which offers a feasible process to obtain wide band gap InP-based QDs with blue emission.

Graphical abstract: InP/ZnS quantum dot photoluminescence modulation via in situ H2S interface engineering

Supplementary files

Article information

Article type
Communication
Submitted
22 sep 2022
Accepted
17 jan 2023
First published
18 jan 2023
This article is Open Access
Creative Commons BY license

Nanoscale Horiz., 2023,8, 522-529

InP/ZnS quantum dot photoluminescence modulation via in situ H2S interface engineering

X. Fan, D. Shin, S. Lee, J. Ye, S. Yu, D. J. Morgan, A. Arbab, J. Yang, J. Jo, Y. Kim, S. Jung, P. R. Davies, A. Rao, B. Hou and J. M. Kim, Nanoscale Horiz., 2023, 8, 522 DOI: 10.1039/D2NH00436D

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