Broadband infrared luminescence of Ni²⁺-doped silicate glass–ceramics containing lithium aluminate spinel nanocrystals

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• 作者：Degang Deng^a ; ^{dengdegang@cjlu.edu.cn} ; Hongping Ma^b ; ^c ; Shiqing Xu^a ; ^{sxucjlu@hotmail.com} ; Qian Wang^a ; Lihui Huang^a ; Shilong Zhao^a ; Huanping Wang^a ; Chenxia Li^a
• 关键词：Ni²⁺ ions ; Glass– ; ceramics ; Broadband infrared luminescence
• 刊名：Journal of Non-Crystalline Solids
• 出版年：2011
• 出版时间：1 March 2011
• 年：2011
• 卷：357
• 期：5
• 页码：1426-1429
• 全文大小：490 K

文摘

Transparent Ni²⁺-doped SiO₂-Al₂O₃-Ga₂O₃-Li₂O (LGAS) glass–ceramics embedding lithium aluminate spinel nanocrystals was prepared. After heat treatment, LiAl₅O₈ crystallite was precipitated in the glasses, and its size was about 3 nm. It was confirmed from the absorption spectra that the ligand environment of Ni²⁺ ions changed from the trigonal bi-pyramid fivefold sites in the as-made glass to the octahedral sites in the glass–ceramics. Upon excitation at 980 nm, broadband infrared luminescence centered at around 1250 nm with full width at half maximum (FWHM) more than 250 nm was observed originating from the ³T₂(³F) → ³A₂(³F) transition of Ni²⁺ in octahedral sites. The broadband near-infrared (NIR) emission from Ni²⁺-doped glass–ceramics can be as host materials for broadband optical amplifier.