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

IF 2.2 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Letters: X Pub Date : 2023-06-01 DOI:10.1016/j.mlblux.2023.100199

K.R. Nagabhushana , H.S. Lokesha , S. Satyanarayana Reddy , N.R. Thejavathi , Fouran Singh

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Abstract

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 $α - A l_{2} O_{3}$ and glycine as a fuel is $γ - A l_{2} O_{3}$ with rhombohedral (R-3c) and cubic (Fd-3m) structures, respectively. The PL spectra of unirradiated and Ni⁷⁺ ions irradiated $α - A l_{2} O_{3}$ 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 $F_{2}^{2 +}$ 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 $α - A l_{2} O_{3}$ and the highest intensity is observed for 1 × 10¹² Ni⁷⁺ cm⁻². PL intensity decreases beyond this fluence. Unirradiated $γ - A l_{2} O_{3}$ samples have greater PL intensity, which decreases with Ni⁷⁺ ion irradiation. PL emissions of R-lines of Mn⁴⁺ and Cr³⁺ are missing in $γ - A l_{2} O_{3}$ due to a lower crystal field in the gamma phase.

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100mev Ni7+离子辐照对α-Al2O3和γ-Al2O3荧光粉光致发光的影响

以尿素和甘氨酸为燃料，采用溶液燃烧法合成了氧化铝荧光粉。XRD结果表明，以尿素为燃料合成的样品为α-Al2O3，以甘氨酸为燃料的样品为γ-Al2O3，分别具有菱形（R-3c）和立方（Fd-3m）结构。未辐照和Ni7+离子辐照的α-Al2O3的PL光谱在1.92和3.2eV之间显示出宽峰，最大值在2.25eV。这种宽发射被认为是F2和F22+中心的组合。此外，在1.83eV（678nm）和1.78eV（695）处观察到的两个尖锐发射分别是由于Mn4+和Cr3+的R线。Ni7+离子在α-Al2O3中辐照后PL强度增强，1×1012 Ni7+cm−2的PL强度最高。PL强度降低超过该注量。未辐照的γ-Al2O3样品具有较大的PL强度，随着Ni7+离子的辐照，PL强度降低。γ-Al2O3中Mn4+和Cr3+的R线的PL发射由于γ相中较低的晶体场而缺失。

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