Excitation band extended in CaYAl₃O₇: Tb³⁺ phosphor by Ce³⁺ co-doped for NUV light-emitting diodes

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• 作者：Hongling Yu ; Xue Yu ; Xuhui Xu ; Tingming Jiang ; Penghui Yang ; Qing Jiao ; Dacheng Zhou ; Jianbei Qiu
• 关键词：CaYAl3O7 ; Combustion method ; Excitation extended ; Energy transfer ; Ce3+ ; Tb3+
• 刊名：Optics Communications
• 出版年：15 April, 2014
• 年：2014
• 卷：317
• 期：Complete
• 页码：78-82
• 全文大小：852 K

文摘

A series of CaYAl₃O₇: Ce³⁺, Tb³⁺ phosphors has been synthesized by combustion method for the first time. XRD measurements demonstrated the phosphor hosts keep pure tetragonal crystalline structure at 850 掳C. The photoluminescence properties of Tb³⁺, Ce³⁺ singly and co-doped CaYAl₃O₇ have been discussed. Under the Ce³⁺ excitation at 360 nm, enhanced green emission was obtained in Ce³⁺ co-doping CaYAl₃O₇: Tb³⁺ sample. And combining the photoluminescence properties and fluorescence decay curves, energy transfer from Ce³⁺ to Tb³⁺ was investigated and a possible mechanism was proposed. The results indicate that CaYAl₃O₇: Ce³⁺, Tb³⁺ phosphors have potential applications as a kind of near ultraviolet-convertible green phosphor for white light-emitting diodes by Ce³⁺ co-doped which perfectly makes excitation band of Tb³⁺ extend from 243 to 360 nm.