Structural and spectroscopic characterizations in Pb²⁺-doped calcium hydroxyapatites

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• 作者：M. Mehnaoui ; G. Panczer ; R. Ternane ; M. Trabelsi-Ayedi ; G. Boulon
• 关键词：Calcium hydroxyapatite ; Pb²⁺ ion ; photoluminescence
• 刊名：Optical Materials
• 出版年：2008
• 期刊代码：81_09253467
• 类别：ch
• 出版时间：July 2008
• 卷：30
• 期：11
• 页码：1672-1676
• 文件大小：207 K

摘要

The luminescence properties of the Pb²⁺ ion in hydroxyapatites compounds Ca_10−xPb_x(PO₄)₆(OH)₂ (0 < x < 10) are studied in a large range of temperature between 20 and 300 K. Calcium–lead apatite system shows a common apatitic structure and occurs as a continuous solid solution. Decay times of Pb²⁺ in this matrix have been measured and analyzed. According to the emission spectrum of Pb²⁺ two different cation sites have been identified in this apatite structure. As a consequence of the two different sites, two emission bands due to the ³P₁ → ¹S₀ transition of the Pb²⁺ ion are observed within this structure. At room temperature and at low lead content x = 0.2 (2%), a blue emission has been observed and at low temperature an ultraviolet band appears, both originating from the same ³P₁ level. For a higher lead content x > 5.0 (50%), concentration quenching occurs and these compounds do not present luminescence. To explain the strong dependence of the decay time τ on temperature, the assumption is made of the presence of the ³P₀ metastable level. Correlations between luminescence and structure are discussed.