Photoluminescent properties of the promising red-emitting phosphor LiGd_{1∿span style='font-style: italic'>x}Eu_x(MoO₄)₂ for WLEDs

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• 作者：Juan Li ; ^{juanli@zjut.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Cheng Lu ; He Lu ; Xiumei Yang ; Bo Zhu ; Hongyou Yu ; Jiawei Sheng ; Shenglei Che
• 关键词：Eu3+ doped molybdates ; White light-emitting diodes ; Red phosphor ; Luminescence ; Solid-state reaction method
• 刊名：Ceramics International
• 出版年：2015
• 出版时间：July 2015
• 年：2015
• 卷：41
• 期：supp_S1
• 页码：S725-S728
• 全文大小：783 K

文摘

A series of LiGd_1−xEu_x(MoO₄)₂ (x=0.01–1) red-emitting phosphors were synthesized by the conventional solid-state reaction method. XRD was used to determine the structure of the samples, showing that the products are single phased with sheelite-like structure. The photoluminescent properties were characterized by a fluorescence spectrophotometer and the effects of the calcination temperature, the holding time as well as the doping concentration, especially the low doping concentration of Eu³⁺, were discussed. Upon excitation with 395 nm, the LiGd(MoO₄)₂:Eu³⁺ phosphors show strong red emission lines at 617 nm which are ascribed to the forced electric dipole transition ⁵D₀–⁷F₂ of Eu³⁺. The appropriate calcination temperature and holding time are 900 °C and 5 h, respectively. With increasing Eu³⁺ doping concentration, the emission intensity of the samples is enhanced and no obvious concentration quenching occurs. The prepared samples are potential red phosphors for near UV White LEDs application.