光谱学与光谱分析 |
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Investigation of Spectroscopy of ZnCuInS/ZnSe/ZnS Quantum Dots |
LIN Yi-jun1,3, LIU Wen-yan1, ZHANG Yu1, 2*, BI Ke2, ZHANG Tie-qiang2, FENG Yi2, WANG Yi-ding1* |
1. State Key Laboratory on Integrated Optoelectronics, and College of Electronic Science and Engineering, Jilin University, Changchun 130012, China 2. State Key Laboratory of Superhard Materials, and College of Physics, Jilin University, Changchun 130012, China 3. Military Simulation Technology Research Institute, Aviation University of Airforce, Changchun 130022, China |
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Abstract ZnCuInS/ZnSe/ZnS quantum dots were non-toxic and heavy-metal free semiconductor nanocrystals. In the present paper, ZnCuInS/ZnSe/ZnS core/shell/shell quantum dots were prepared with the particle size of 3.3, 2.7 and 2.3 nm. The photoluminescence of ZnCuInS/ZnSe/ZnS quantum dots with different size were measured, and the wavelength of peak was blue-shifted with decreasing the diameter. The wavelength of absorption peaks and photoluminescence peaks were 510 nm,611 nm (3.3 nm), 483 nm, 583 nm (2.7 nm) and 447 nm and 545 nm(2.3 nm). The obvious size-dependence of ZnCuInS/ZnSe/ZnS quantum dots was shown. The Stokes shifts of ZnCuInS/ZnSe/ZnS quantum dots were 398 meV (3.3 nm), 436 meV (2.7 nm) and 498 meV (2.3 nm). Such large Stokes shifts indicate that the emission should be ascribed to the defect-related recombination. The temperature-dependent photoluminescence of ZnCuInS/ZnSe/ZnS quantum dots with the particle size of 3.3 nm were measured. The wavelength of peaks was red-shifted with increasing temperature and the intensity of photoluminescence spectra was decreased with increasing temperature. Therefore, the emission was concluded to be the transition from the conduction band to defect state.
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Received: 2013-03-31
Accepted: 2013-07-12
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Corresponding Authors:
ZHANG Yu,WANG Yi-ding
E-mail: yuzhang@jlu.edu.cn;wangyiding48@yahoo.com.cn
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