Effect of 100 MeV Ni7+ ion irradiation on photoluminescence of α-Al2O3 and γ-Al2O3 phosphor

被引：1
作者：
Nagabhushana, K. R. [1 ]
Lokesha, H. S. [1 ]
Reddy, S. Satyanarayana [2 ]
Thejavathi, N. R. [3 ]
Singh, Fouran [4 ]
机构：
[1] Univ Fed Sao Paulo, Santos Campus, BR-11070100 Santos, SP, Brazil
[2] RV Inst Technol & Management, Dept Phys, Bengaluru 560076, India
[3] Govt Coll Autonomous, Dept Phys, Mandya 571401, India
[4] Inter Univ Accelerator Ctr, POB 10502, New Delhi 110067, India
来源：
MATERIALS LETTERS-X | 2023年 / 18卷
关键词：
Phosphors; Radiation damage; Defects; Luminescence; OPTICAL-PROPERTIES; HEAVY-ION; LUMINESCENCE; DEFECTS;
D O I：
10.1016/j.mlblux.2023.100199
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Aluminum oxide phosphors were synthesized by solution combustion method using urea and glycine as fuel. XRD results show that the sample synthesized with urea as a fuel is & alpha; Al2O3 and glycine as a fuel is & gamma; Al2O3 with rhombohedral (R-3c) and cubic (Fd-3m) structures, respectively. The PL spectra of unirradiated and Ni7+ ions irradiated & alpha; Al2O3 show a broad peak between 1.92 and 3.2 eV with maxima at 2.25 eV. This broad emission is assigned to the combination of F2 and F22+ centers. In addition, two sharp emissions observed at 1.83 eV (678 nm) and 1.78 eV (695) are due to R-lines of Mn4+ and Cr3+ respectively. The PL intensity is enhanced after Ni7+ ion irradiation in & alpha; Al2O3 and the highest intensity is observed for 1 x 1012 Ni7+ cm  2. PL intensity decreases beyond this fluence. Unirradiated & gamma; Al2O3 samples have greater PL intensity, which decreases with Ni7+ ion irradiation. PL emissions of R-lines of Mn4+ and Cr3+ are missing in & gamma; Al2O3 due to a lower crystal field in the gamma phase.
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页数：4
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