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

{"title":"Effect of 100 MeV Ni7+ ion irradiation on photoluminescence of α-Al2O3 and γ-Al2O3 phosphor","authors":"K.R. Nagabhushana , H.S. Lokesha , S. Satyanarayana Reddy , N.R. Thejavathi , Fouran Singh","doi":"10.1016/j.mlblux.2023.100199","DOIUrl":null,"url":null,"abstract":"<div>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 <math><mrow><mi>α</mi><mspace></mspace><mo>-</mo><mi>A</mi><msub><mi>l</mi><mn>2</mn></msub><msub><mi>O</mi><mn>3</mn></msub></mrow></math> and glycine as a fuel is <math><mrow><mi>γ</mi><mspace></mspace><mo>-</mo><mi>A</mi><msub><mi>l</mi><mn>2</mn></msub><msub><mi>O</mi><mn>3</mn></msub></mrow></math> with rhombohedral (R-3c) and cubic (Fd-3m) structures, respectively. The PL spectra of unirradiated and Ni7+ ions irradiated <math><mrow><mi>α</mi><mspace></mspace><mo>-</mo><mi>A</mi><msub><mi>l</mi><mn>2</mn></msub><msub><mi>O</mi><mn>3</mn></msub></mrow></math> 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 <math><mrow><msubsup><mi>F</mi><mrow><mn>2</mn></mrow><mrow><mn>2</mn><mo>+</mo></mrow></msubsup></mrow></math> 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 <math><mrow><mi>α</mi><mspace></mspace><mo>-</mo><mi>A</mi><msub><mi>l</mi><mn>2</mn></msub><msub><mi>O</mi><mn>3</mn></msub></mrow></math> and the highest intensity is observed for 1 × 1012 Ni7+ cm−2. PL intensity decreases beyond this fluence. Unirradiated <math><mrow><mi>γ</mi><mspace></mspace><mo>-</mo><mi>A</mi><msub><mi>l</mi><mn>2</mn></msub><msub><mi>O</mi><mn>3</mn></msub></mrow></math> samples have greater PL intensity, which decreases with Ni7+ ion irradiation. PL emissions of R-lines of Mn4+ and Cr3+ are missing in <math><mrow><mi>γ</mi><mspace></mspace><mo>-</mo><mi>A</mi><msub><mi>l</mi><mn>2</mn></msub><msub><mi>O</mi><mn>3</mn></msub><mspace></mspace></mrow></math> due to a lower crystal field in the gamma phase.</div>","PeriodicalId":18245,"journal":{"name":"Materials Letters: X","volume":null,"pages":null},"PeriodicalIF":2.2000,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Materials Letters: X","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2590150823000194","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}

引用次数: 0

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.

查看原文

微信好友朋友圈 QQ好友复制链接

本刊更多论文

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。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文去求助

来源期刊