Open AccessTemperature dependence of photoluminescence properties of water-soluble CdS quantum dots
Author(s) -
Kunio Shimura,
TaeGi Lee,
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 - 10.1088/1742-6596/1220/1/012029
Subject(s) - photoluminescence , quantum dot , exciton , condensed matter physics , materials science , enhanced data rates for gsm evolution , molecular physics , chemistry , optoelectronics , physics , telecommunications , computer science
We investigated the size dependence of band-edge photoluminescence (PL) dynamics for CdS quantum dots (QDs). The temperature dependence of the PL-decay profiles of CdS QDs with an average diameter of 3.7–6.0 nm was measured. The PL-decay profiles became longer as the temperature increased. Further, it was found that the temperature dependence of the PL-decay profiles depends greatly on the QD size. These experimental results can be understood by considering that the magnitude of the splitting energy between the bright-and dark-exciton states depends on the QD size and becomes larger as the QD size becomes smaller.