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Open Access Near-infrared Broadband Luminescence Properties of Bi and Nd Co-doped CsI Crystals

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Bi and Nd co-doped CsI (Bi,Nd:CsI) crystals were grown by a vertical Bridgman method. The result by X-ray diffraction shows that the as-grown Bi,Nd:CsI crystal exhibits a single-phase (Pm3m) CsI, and the doping of Bi and Nd ions into the Bi,Nd:CsI crystal lattice does not affect its basic crystal structure. It was found that the co-doping could lead to the decrease of Bi doping concentration. The co-doped crystal was annealed, and the absorption and emission spectra of the crystal were determined. The results show that Bi and Nd co-doping can increase the concentration of V′cs. A high temperature annealing can obtain a lower valence state of the Bi ions luminous clusters, which improves the near-infrared broadband luminescence properties of the crystal. The Bi,Nd:CsI crystal has two Raman characteristic peaks of near-infrared broadband luminescence centers, which are located at 164 and 176 cm-1, respectively. In addition, the formation of Bi+ and Bi2+ bound up with the aggregation of high-valence Bi ions was also discussed.
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Keywords: bismuth; cesium iodide crystal; co-doping; near-infrared luminescence; neodymium

Document Type: Research Article

Affiliations: Key Laboratory of Transparent and Opto-functional Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201800, China

Publication date: 2013-06-01

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  • Journal of the Chinese Ceramic Society (JCCS), published in Chinese and in English, is a comprehensive monthly periodical focused on the fields of inorganic and non-metallic materials. The main purpose of the JCCS is to report the latest creative achievements in research, production and design for ceramics, glass, cementing materials, refractory, artificial crystals and other non-metallic materials. JCCS is regarded as an important journal in inorganic and non-metallic materials sciences in China and has been awarded by China Association for Science and Technology. The full-text of papers in JCCS is also published by CNKI (China National Knowledge Infrastructure). JCCS is indexed in EI Compendex, CA( Chemical Abstracts) ,SA and Ж and more than 20 databases.
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