Preparation and Luminescence Properties of CaWO4:Eu3+ Red Emitting Phosphor for White LEDs
Abstract:A series of Ca1-xWO4:xEu3+ (i.e., x = 0.10, 0.15, 0.20, 0.25 and 0.30) and Ca0.5WO4:0.25Eu3+,0.25Mx (i.e., M = Li, Na and K) red phosphor samples were synthesized for white LEDs via a high temperature solid state reaction. The crystal structure of the samples was characterized by X-ray diffraction, and the effect of Eu3+ and M+ doping quantity on the luminescence properties of phosphors was investigated by fluorescence spectrophotometry. The results show that Ca1-xWO4:xEu3+ and Ca0.5WO4:0.25Eu3+,0.25M+ crystallines synthesized are a tetragonal scheelite structure. The phosphors can be effectively excited by near-UV (393 nm) and blue light (464 nm), and the major peak is located at 615 nm due to the 5D0→7F2 transition of Eu3+. Also, the optimum doping quantity of Eu3+ in Ca1-xWO4:xEu3+ phosphors is 25% in mole fraction, and the introduction of alkalis ion M+ as a charge compensator can improve the luminous intensity of Ca0.75WO4:0.25Eu3+:M+. The optimal doping ion in phosphor is Li+.
Document Type: Research Article
Affiliations: School of Advanced Materials and Nano Technology, Xidian University, Xi’an 710071, China
Publication date: December 1, 2013
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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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