High luminescent brightness and thermal stability of red emitting Li₃Ba₂Y₃(WO₄)₈:Eu³⁺ phosphor

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• 作者：Lei Wang^a ; ^b ; Wenlei Guo^a ; ^b ; Yue Tian^a ; ^b ; ^{tianyue@tyut.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Ping Huang^a ; ^b ; Qiufeng Shi^a ; ^b ; Cai&rsquo ; e Cui^a ; ^b ; ^{tytgcejy@sina.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Li3Ba2Y3(WO4)8 ; Concentration quenching ; Optical transition ; Thermal stability
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：42
• 期：12
• 页码：13648-13653
• 全文大小：1746 K

文摘

A series of Li₃Ba₂Y_3−x(WO₄)₈:xEu³⁺ (x=0.1, 1, 1.5, 2 and 2.8) phosphors were synthesized by a high temperature solid-state reaction method. Under the excitation of near ultraviolet (NUV) light, the as-prepared phosphor exhibits intense red luminescence originating from the characteristic transitions of Eu³⁺ ions, which is 1.8 times as strong as the commercial Y₂O₂S:Eu³⁺ phosphor. The optimal doping concentration of Eu³⁺ ions here is confirmed as x=1.5. The electric dipole-quadrupole (D-Q) interaction is deduced to be responsible for concentration quenching of Eu³⁺ ions in the Li₃Ba₂Y₃(WO₄)₈ phosphor. The analysis of optical transition and Huang-Rhys factor reveals a weak electron-phonon coupling interaction. The temperature-dependent emission spectra also indicate that the as-prepared Li₃Ba₂Y₃(WO₄)₈:Eu³⁺ phosphor has better thermal stability than that of the commercial Y₂O₂S:Eu³⁺ phosphor. Therefore, our results show that the as-prepared Li₃Ba₂Y₃(WO₄)₈:Eu³⁺ phosphor is a promising candidate as red emitting component for white light emitting diodes (LEDs).