Energy transfer in co-and tri-doped Y₃Al₅O₁₂ phosphors

K.Santhosh Kumar¹，娄朝刚¹，谢宇飞¹，胡琳¹，A.Gowri Manohari²，肖东³，叶慧琪³，唐靓³，Didier Pribat¹

1. School of Electronic Science and Engineering,Southeast University2. School of Biological Sciences and Medical Engineering,Southeast University3. Nanjing Institute of Astronomical Optics & Technology

摘 要：Single-doped(Ce³⁺,Tb³⁺), co-doped(Ce³⁺-Tb³⁺, Ce³⁺-Yb³⁺, Tb³⁺-Yb³⁺) and tri-doped(Ce³⁺-Tb³⁺-Yb³⁺) Y₃Al₅O₁₂ phosphors were synthesized by a solid-state reaction method. The XRD, excitation and emission spectra and the fluorescence lifetime of the samples were measured. The energy transfer mechanism was also investigated. The results showed that the energy transfer efficiency from Tb³⁺ to Ce³⁺ was 51% and the energy transfer efficiency from Ce³⁺ to Yb³⁺ was 63.1%. Concomitantly, both were more efficient than that from Ce³⁺ to Tb³⁺（7%） and from Tb³⁺ to Yb³⁺（10.2%）. Also, the Yb³⁺ ions received energy mainly from Ce³⁺ ions in Ce³⁺-Tb³⁺-Yb³⁺ tri-doped Y₃Al₅O₁₂ phosphors. Among these materials, Ce³⁺-Yb³⁺ co-doped YAG phosphors are a better choice than others as a down-conversion material due to their higher energy transfer efficiency.

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