Photoluminescence properties of LiTi_{2 − x}Eu_x(PO₄)₃ phosphor

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• 作者：R. Ramaraghavulu ; V. Naresh and V. Eswaraiah
• 刊名：Luminescence
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：32
• 期：1
• 页码：11-16
• 全文大小：464K
• ISSN：1522-7243

文摘

A solid-state reaction route-based LiTi_{2 − x}Eu_x(PO₄)₃ was phosphor synthesized for the first time to evaluate its luminescence performance by excitation, emission and lifetime (τ) measurements. The LiTi_{2 − x}Eu_x(PO₄)₃ phosphor was excited at λ_exci. = 397 nm to give an intense orange–red (597 nm) emission attributed to the ⁵D₀ → ⁷F₁ magnetic dipole (ΔJ = ±1) transition and red (616 nm) emission (⁵D₀ → ⁷F₂), which is an electric dipole (ΔJ = ±2) transition of the Eu³⁺ ion. Beside this, excitation and emission spectra of host LiTi₂(PO₄)₃ powder were also reported. The effect of Eu³⁺ concentration on luminescence characteristics was explained from emission and lifetime profiles. Concentration quenching in the LiTi_{2 − x}Eu_x(PO₄)₃ phosphor was studied from the Dexter's model. Dipole–quadrupole interaction is found to be responsible for energy transfer among Eu³⁺ ions in the host lattice. The LiTi_{2 − x}Eu_x(PO₄)₃ phosphor displayed a reddish-orange colour realized from a CIE chromaticity diagram. We therefore suggest that this new phosphor could be used as an optical material of technological importance in the field of display devices. Copyright