期刊
ACS NANO
卷 6, 期 10, 页码 9058-9067出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn303217q
关键词
quantum dots; luminescence temperature quenching; LED; core-shell nanostructure; quantum yield
类别
资金
- division of Chemical Sciences (CW) of the Dutch Science Foundation (NWO) [ECHO.06.B.047]
Thermal quenching of quantum dot (QD) luminescence is important for application in luminescent devices. Systematic studies of the quenching behavior above 300 K are, however, lacking. Here, high-temperature (300-500 K) luminescence studies are reported to highly efficient CdSe core-shell quantum dots (QDs), aimed at obtaining insight into temperature quenching of QD emission. Through thermal cycling (yoyo) experiments for QDs in polymer matrices, reversible and irreversible luminescence quenching processes can be distinguished. For a variety of core-shell systems, reversible quenching is observed in a similar temperature range, between 100 and 180 degrees C. The irreversible quenching behavior varies between different systems. Mechanisms for thermal quenching are discussed.
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