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Temperature dependence of the photoluminescence of MnS/ZnS core–shell quantum dots |
| Fang Dai-Feng (房岱峰)a, Ding Xing (丁星)b, Dai Ru-Cheng (代如成)c, Zhao Zhi (赵智)a, Wang Zhong-Ping (王中平)c, Zhang Zeng-Ming (张增明)c |
a Hefei National Laboratory for Physical Sciences at Microscale and Department of Physics, University of Science and Technology of China, Hefei 230026, China;
b Physics Department, Anhui University, Hefei 230601, China;
c Center of Physical Experiments, University of Science and Technology of China, Hefei 230026, China |
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Abstract The temperature dependence of the photoluminescence (PL) from MnS/ZnS core–shell quantum dots is investigated in a temperature range of 8 K–300 K. The orange emission from the 4T1 → 6A1 transition of Mn2+ ions and the blue emission related to the trapped surface state are observed in the MnS/ZnS core–shell quantum dots. As the temperature increases, the orange emission is shifted toward a shorter wavelength while the blue emission is shifted towards the longer wavelength. Both the orange and blue emissions reduce their intensities with the increase of temperature but the blue emission is quenched faster. The temperature-dependent luminescence intensities of the two emissions are well explained by the thermal quenching theory.
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Received: 03 June 2014
Revised: 07 August 2014
Accepted manuscript online:
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PACS:
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78.67.-n
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(Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)
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78.55.Et
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(II-VI semiconductors)
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78.67.Hc
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(Quantum dots)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11304300, 21002097, 11074232, and 11274288), the National Basic Research Program of China (Grant Nos. 2011CB932801 and 2012CB933702), the Fund from the Ministry of Education of China (Grant No. 20123402110034), the Fundamental Research Funds for the Central Universities (Grant No. WK2030420002), and the Anhui Provincial Natural Science Foundation, China (Grant No. 1308085QA06). |
Corresponding Authors:
Dai Ru-Cheng
E-mail: dairc@ustc.edu.cn
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Cite this article:
Fang Dai-Feng (房岱峰), Ding Xing (丁星), Dai Ru-Cheng (代如成), Zhao Zhi (赵智), Wang Zhong-Ping (王中平), Zhang Zeng-Ming (张增明) Temperature dependence of the photoluminescence of MnS/ZnS core–shell quantum dots 2014 Chin. Phys. B 23 127804
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