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Size- and Composition-Dependent Energy Transfer from Charge Transporting Materials to ZnCuInS Quantum Dots

Authors :
Jialong Zhao
Pengtao Jing
Yasuaki Masumoto
Xi Yuan
Wenjin Zhang
Ligong Zhang
Xinhua Zhong
Haibo Li
Source :
The Journal of Physical Chemistry C. 116:11973-11979
Publication Year :
2012
Publisher :
American Chemical Society (ACS), 2012.

Abstract

We studied the energy transfer processes from organic charge transporting materials (CTMs) to ZnCuInS (ZCIS) quantum dots (QDs) with different emission wavelength by steady-state and time-resolved photoluminescence (PL) spectroscopy. The change in the PL excitation intensity of the ZCIS QDs and the PL decay time of the CTMs clearly demonstrated an efficient energy transfer process in the ZCIS/CTM blend films. It was found that the efficiency of Forster resonance energy transfer significantly increases with increasing the particle size and decreasing the Zn content in the QDs, which is well consistent with the estimated Forster radii (R0) varying from 3 to 5 nm. In addition, the PL quenching of the QDs related to the charge separation process was also observed in some of the samples. The energy transfer and charge separation processes in the films were well explained based on the band alignment between the ZCIS QDs and CTMs.

Details

ISSN :
19327455 and 19327447
Volume :
116
Database :
OpenAIRE
Journal :
The Journal of Physical Chemistry C
Accession number :
edsair.doi...........8f3675525cabb58501a8a614ba1e41e9
Full Text :
https://doi.org/10.1021/jp3037236