Chin. Phys. Lett.  2017, Vol. 34 Issue (8): 087801    DOI: 10.1088/0256-307X/34/8/087801
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
Ionoluminescence Spectra of a ZnO Single Crystal Irradiated with 2.5MeV H$^{+}$ Ions
Li Zheng1, Guang-Fu Wang1,2**, Meng-Lin Qiu1, Ying-Jie Chu1, Mi Xu1, Peng Yin1
1College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875
2Beijing Radiation Center, Beijing 100875
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Abstract The ionoluminescence (IL) spectra of a ZnO single crystal irradiated with 2.5 MeV H$^{+}$ ions reveal that its intensity decreases with increasing the ion fluence, which indicates that the concentration of luminescence centers decreases with irradiation. The Gaussian decomposition results of the ZnO IL spectrum with a fluence of 1.77$\times$10$^{11}$ ions/cm$^{2}$ show that the spectrum is a superposition of energy levels centered at 1.75 eV, 2.10 eV, 3.12 eV and 3.20 eV. The four peaks are associated with electronic transitions from CB to V$_{\rm Zn}$, CB to O$_{\rm i}$, Zn$_{\rm i}$ to VB and the decay of self-trapped excitons, respectively. The results of single-exponential fitting demonstrate that different luminescent centers have different radiation resistance, which may explain why the emission decreases more slowly in the NBE band than in the DBE band. The agglomeration of larger point clusters accounts for the decrease in the concentration of luminescence centers and the increase in the concentration of non-luminescence centers, which indicates that the defect clusters induced by ion implantation act as nonradiative recombination centers and suppress light emission. The results of the photoluminescence spectra of a virgin ZnO single crystal and a ZnO single crystal irradiated with a fluence of 3.4$\times$10$^{14}$ ions/cm$^{2}$ show that compared with the virgin ZnO, the emission intensity of irradiated ZnO decreases by nearly two orders of magnitude, which demonstrates that the irradiation effect reduces radiative recombination and enhances nonradiative recombination. The conclusions of photoluminescence are consistent with the IL results.
Received: 10 May 2017      Published: 22 July 2017
PACS:  78.60.Hk (Cathodoluminescence, ionoluminescence)  
  61.80.Jh (Ion radiation effects)  
  61.72.J- (Point defects and defect clusters)  
  61.72.uj (III-V and II-VI semiconductors)  
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Li Zheng, Guang-Fu Wang, Meng-Lin Qiu et al  2017 Chin. Phys. Lett. 34 087801
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http://cpl.iphy.ac.cn/10.1088/0256-307X/34/8/087801       OR      http://cpl.iphy.ac.cn/Y2017/V34/I8/087801
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Li Zheng
Guang-Fu Wang
Meng-Lin Qiu
Ying-Jie Chu
Mi Xu
Peng Yin
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