Up-conversion luminescence of new phosphors of Gd₃Al₅O₁₂:Yb/Er stabilized with Lu³⁺

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• 作者：Jinkai Li^a ; ^b ; Ji-Guang Li^b ; ^c ; ^{LI.Jiguang@nims.go.jp" class="auth_mail" title="E-mail the corresponding author} ; Xiaodong Li^b ; Xudong Sun^b
• 关键词：Gd3Al5O12 garnet ; Yb/Er codoping ; Crystal lattice stabilization ; Up-conversion behavior
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：1 February 2016
• 年：2016
• 卷：42
• 期：2
• 页码：3268-3274
• 全文大小：2310 K

文摘

The metastable garnet lattice of Yb/Er co-doped Gd₃Al₅O₁₂ (GdAG:Yb/Er) has been effectively stabilized by doping with significantly smaller Lu³⁺ to form (Gd,Lu)AG:Yb/Er solid solutions. The phase-pure (Gd,Lu)AG:Yb/Er garnet particles have been successfully achieved by calcining their respective precursors synthesized via carbonate co-precipitation. Partially replacing Gd³⁺ with Lu³⁺ up to 50 at% (x=0.5) not only lowers the temperature of garnet crystallization, but also raises the theoretical density of the material. The resultant [(Gd_1−xLu_x)_0.948Yb_0.05Er_0.002]AG (x=0.1–0.5) powders, with good dispersion and fairly uniform particle morphology, exhibit strong green (~510 to 590 nm, ²H_11/2, ⁴S_3/2→⁴I_15/2 transitions of Er³⁺) and red (~635 to 700 nm, ⁴F_9/2→⁴I_15/2 transition of Er³⁺) emissions under 978 nm laser excitation. The Lu³⁺ incorporation effect on the visible emission color and intensity of Er³⁺, as well as the dependence of emission intensity on pumping power were all discussed in detail. The up-conversion phosphor of Yb/Er codoped (Gd,Lu)AG garnet developed in this work may potentially be used as a new type of luminescent material.