Eu²⁺/Dy³⁺ co-doped white light emission glass ceramics under UV light excitation

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• 作者：Renguang Ye^a ; ^{yerenguang@163.com"" rel=""nofollow} ; Zhiguang Cui^a ; Youjie Hua^a ; Degang Deng^a ; Shilong Zhao^a ; Chenxia Li^a ; Shiqing Xu ; ^a ; ^{sxucjlu@hotmail.com"" rel=""nofollow}
• 关键词：White light ; Glass ceramics ; Energy transfer ; Luminescence
• 刊名：Journal of Non-Crystalline Solids
• 出版年：2011
• 出版时间：June 2011
• 年：2011
• 卷：357
• 期：11-13
• 页码：2282-2285
• 全文大小：611 K

文摘

In the present work, transparent Eu²⁺/Dy³⁺ co-doped white light-emitting glass ceramics containing CaF₂ were successfully prepared under reducing atmosphere. Their luminescence properties have been studied by excitation and emission spectra. A combination of blue, yellow and red emissions has emerged in Eu²⁺/Dy³⁺ co-doped glass and glass ceramics, which allows the observation of bright white light when the samples are excited by the ultraviolet light. Energy transfer (ET) from Eu²⁺ to Dy³⁺ is discovered by directly observing the luminescence intensity of Dy³⁺ in the Eu²⁺/Dy³⁺ co-doped glass which is much stronger than that in the Dy³⁺-doped glass. ET from Eu²⁺ to Dy³⁺ in glass is further confirmed by fluorescence studies performed on the samples with various activator (Dy³⁺) concentrations. The color of luminescence could be adjusted by varying the proportions of europium and dysprosium. The optimal composition generates white light with chromaticity coordinates (0.296, 0.311). The results indicate that Eu²⁺/Dy³⁺ co-doped glass ceramics containing CaF₂ nano-crystals is a potential material for white LED.