Combustion Synthesis and Luminescence Properties of Li₂Ca_1-x-ySiO₄: xEu³⁺, ySm³⁺ Phosphors

Abstract:

A series of red-emitting phosphors, Eu³⁺-doped and Eu³⁺ with Sm³⁺ co-doped Li₂CaSiO₄, were prepared by the combustion method. The phase composition was investigated by XRD, and photoluminescent properties were characterized by fluorescent spectrophotometer. The results show that the diffraction peaks of samples all match well with that of Li₂CaSiO₄ [JCPDS NO. 27-0290]. The excitation spectra consists of the broadband and the sharp lines, which are assigned to the charge transfer band (CTB) of Eu³⁺→O^2– and the typical intra-4f transitions of the Eu³⁺ ions, respectively. The emission spectrum covers the characteristic f-f transitions of Eu³⁺, namely, ⁵D₀→⁷F₁ (596 nm), ⁵D₀→⁷F₂ (620 nm), ⁵D₀→⁷F₃ (657 nm) and ⁵D₀→⁷F₄ (705 nm). The concentration quenching occurs when Eu³⁺ mol fraction equals to 9%. When Eu³⁺and Sm³⁺ were co-doped, the luminous intensity of the emission spectrum was superior to the Eu³⁺ mono-doped, which explains the Sm³⁺ has a sensitization effect for Eu³⁺.

• Periodical: Materials Science Forum (Volume 814)
• Pages: 384-388
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.814.384
• Online since: March 2015
• Authors: Ce Zhao, Ke Hui Qiu, Xia He, Guo Yin Yan, Si Zhu Chen
• Keywords: Co-Doped, Combustion Method, Energy Transfer, Li₂CaSiO₄

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