| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Luminescence properties of ZnS：Cu, Eu semiconductor nanocrystals synthesized by a hydrothermal process |
| Xin Mei (新梅)a, Hu Li-Zhong (胡礼中)b |
a School of Physics and Materials Engineering, Dalian Nationalities University, Dalian 116600, China;
b School of Physics and Optoelectronic Engineering, Dalian University of Technology, Dalian 116024, China |
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Abstract ZnS:Cu, Eu nanocrystals with an average diameter of ～ 80 nm are synthesized using a hydrothermal approach at 200 ℃. The photoluminescence (PL) properties of the ZnS:Cu, Eu nanocrystals before and after annealing, as well as the doping form of Eu, are studied. The as-synthesized samples are characterized by X-ray diffraction, scanning electron microscopy, inductively coupled plasma-atomic emission spectrometry, and the excitation and emission spectra (PL). The results show that both Cu and Eu are indeed incorporated into the ZnS matrix. Compared with the PL spectrum of the Cu mono-doped sample, the PL emission intensity of the Cu and Eu-codoped sample increases and a peak appears at 516 nm, indicating that Eu3+ ions, which act as an impurity compensator and activator, are incorporated into the ZnS matrix, forming a donor level. Compared with the unannealed sample, the annealed one has an increased PL emission intensity and the peak position has a blue shift of 56 nm from 516 nm to 460 nm, which means that Eu3+ ions reduce to Eu2+ ions, thereby leading to the appearance of Eu2+ characteristic emission and generating effective host-to-Eu2+ energy transfer. The results indicate the potential applications of ZnS:Cu, Eu nanoparticles in optoelectronic devices.
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Received: 24 October 2012
Revised: 12 January 2013
Accepted manuscript online:
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PACS:
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78.55.Et
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(II-VI semiconductors)
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78.56.Cd
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(Photocarrier radiometry)
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78.67.Bf
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(Nanocrystals, nanoparticles, and nanoclusters)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 10374011) and the Doctoral Fund of Dalian Nationalities University, China (Grant No. 20116201). |
Corresponding Authors:
Hu Li-Zhong
E-mail: lizhongh@dlut.edu.cn
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Cite this article:
Xin Mei (新梅), Hu Li-Zhong (胡礼中) Luminescence properties of ZnS：Cu, Eu semiconductor nanocrystals synthesized by a hydrothermal process 2013 Chin. Phys. B 22 087804
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