Multi-channel transition emissions of Sm³⁺ in lithium yttrium aluminum silicate glasses and derived opalescent glass ceramics

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• 作者：Fangfang Fu ; Baojie Chen ; Lifan Shen ; Edwin Yue Bun Pun ; Hai Lin
• 关键词：Radiative parameters ; Samarium ions ; External quantum yield ; Orientational crystallization
• 刊名：Journal of Alloys and Compounds
• 出版年：2014
• 出版时间：5 January, 2014
• 年：2014
• 卷：582
• 期：Complete
• 页码：265-272
• 全文大小：1434 K

文摘

Sm³⁺-doped lithium-yttrium-aluminum-silicate (LYAS) glasses have been fabricated and effective visible and near-infrared (NIR) emissions are exhibited. The predicated spontaneous emission probabilities (A_rad) are derived to be 29.1, 149.2, 150.1 and 39.0 s^?1 for conventional visible emissions assigned to ⁴G_5/2 ¡ú ⁶H_J (J = 5/2, 7/2, 9/2 and 11/2) transitions, and A_rad are obtained to be 24.8, 4.6 and 2.7 s^?1 for the optical transitions ⁴G_5/2 ¡ú ⁶F_J (J = 5/2, 7/2 and 9/2) corresponding to the NIR emissions, respectively. The maximum stimulated emission cross-sections (¦Ò_em) are obtained to be 7.45 ¡Á 10^?22 and 0.48 ¡Á 10^?22 cm² for visible (⁴G_5/2 ¡ú ⁶H_9/2) and NIR (⁴G_5/2 ¡ú ⁶F_9/2) emissions, respectively. Internal quantum efficiency for the ⁴G_5/2 level and external quantum yield for visible emissions of Sm³⁺ are determined to be 44.9 % and 11.58 % , respectively. High temperature heat treatment testing was carried out on the LYAS glasses and orientational crystallization was observed. Visible transition emissions of Sm³⁺ with obvious Stark splitting indicate Sm³⁺ ions have been introduced into the YAG micro-crystal formed in the glass ceramics. Investigations on multi-channel radiative transition emissions of Sm³⁺ in LYAS glasses provide a new clue to develop tunable lasers, compact light sources and optoelectronic devices.