Open AccessPreparation of ZnSe-ZnS alloy quantum dots by a hydrothermal method and their optical properties
Author(s) -
Hisaaki Nishimura,
Yuxin Lin,
Yuki Kunimasa,
DaeGwi Kim
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1220/1/012027
Subject(s) - photoluminescence , quantum dot , alloy , hydrothermal circulation , absorption edge , materials science , absorption (acoustics) , band gap , enhanced data rates for gsm evolution , optoelectronics , chemical engineering , metallurgy , composite material , telecommunications , engineering , computer science
We prepared colloidal ZnSe x S 1− x alloy quantum dots (QDs) and investigated their optical properties. ZnSe x S 1− x QDs were successfully prepared by a hydrothermal method, which was confirmed by the results of X-ray structural analysis. When the alloy composition was decreased from x = 1 to 0, the absorption energy continuously shifted to the high energy side. Band-edge photoluminescence (PL) was the main PL band in ZnSe QDs, whereas only defect - related PL band was observed in ZnS QDs. The band-edge PL was clearly observed as the main PL band for x = 0.52 to 1, which shifted to the high energy side by decreasing x .