Doping concentration dependence on VUV luminescence of Tm:CaF₂

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• 作者：Noriaki Kawaguchi ; Takayuki Yanagida ; Yoshisuke Futami ; Yutaka Fujimoto ; Kentaro Fukuda ; Shinji Kajimoto ; Hiroshi Fukumura ; Shunsuke Kurosawa ; Yuui Yokota ; Akira Yoshikawa
• 关键词：Fluorides ; Scintillator ; VUV
• 刊名：Optical Materials
• 出版年：2013
• 出版时间：September, 2013
• 年：2013
• 卷：35
• 期：11
• 页码：1898-1901
• 全文大小：1223 K

文摘

Luminescence and scintillation properties of Tm³⁺ 0.1-15 % doped CaF₂ crystals were systematically investigated. The crystals were grown by a simple solidification method which allowed us to obtain single crystals conveniently. In X-ray induced radio luminescence spectra, the luminosity of the self-trapped-exciton (STE) emission of CaF₂ at 270 nm decreased with increasing of Tm³⁺ concentration. The Tm³⁺ 5d-4f transition based emission lines appeared at 175 nm (4f¹¹5d high spin state (HS) ¡ú ³H₆) and at 165 nm (low spin state (LS) to ³H₆). Pulse height spectra were measured under ¦Á-ray irradiation by using vacuum ultra-violet (VUV) sensitive photomultiplier tube (PMT) R8778 and Tm³⁺ 0.1 % doped specimen exhibited the highest light yield.