Spectral and luminescent properties of trivalent samarium ions in KLu(WO₄)₂ crystals

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• 作者：Kunpeng Wang ; Jianxiu Zhang ; Jiyang Wang ; Wentao Yu ; Huaijin Zhang ; Zhengping Wang and Zongshu Shao
• 关键词：A. Optical materials ; B. Crystal growth ; D. Optical properties
• 刊名：Materials Research Bulletin
• 出版年：2006
• 出版时间：14 September 2006
• 年：2006
• 卷：41
• 期：9
• 页码：1695-1700
• 全文大小：194 K

文摘

The crystals of Sm³⁺-doped KLu(WO₄)₂ with large dimensions up to 40 mm × 33 mm × 13 mm have been grown by the top-seeded solution growth (TSSG) method. The spectral and luminescent properties have been investigated. Based on the Judd–Ofelt theory, the following spectral parameters have been obtained: the phenomenological intensity parameters Ω_t, Ω₂ = 15.728 × 10⁻²⁰ cm², Ω₄ = 4.223 × 10⁻²⁰ cm² and Ω₆ = 2.839 × 10⁻²⁰ cm², radiative transition probabilities e=""mml3"">e=""text-decoration:none; color:black"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6TXC-4JFGCRC-3&_mathId=mml3&_user=10&_cdi=5587&_rdoc=15&_handle=V-WA-A-W-WC-MsSAYWW-UUW-U-AAZCWBBVUU-AAZWYAVWUU-VWWZCEBC-WC-U&_acct=C000050221&_version=1&_userid=10&md5=a26069927b7c038480d045df20cdf033"" title=""Click to view the MathML source"">A_J,J^′ and oscillator strengths e=""mml4"">e=""text-decoration:none; color:black"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6TXC-4JFGCRC-3&_mathId=mml4&_user=10&_cdi=5587&_rdoc=15&_handle=V-WA-A-W-WC-MsSAYWW-UUW-U-AAZCWBBVUU-AAZWYAVWUU-VWWZCEBC-WC-U&_acct=C000050221&_version=1&_userid=10&md5=ce7af685f8f88611b319149fbfd84d45"" title=""Click to view the MathML source"">P_J,J^′. The radiative lifetime of levels ⁴G_5/2 is 748 μs. However, the measured emission lifetime is τ_em = 569 μs. The quantum efficiency is very low because of the excited state absorption. In addition, the values of integrated emission cross-sections are also calculated.