Fabrication and properties of transparent Tb:YAG fluorescent ceramics with different doping concentrations

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• 作者：Jiawei Dai^a ; ^b ; Maoqing Cao^c ; Huamin Kou^a ; Yubai Pan^a ; ^d ; ^{ybpan@shnu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Jingkun Guo^a ; Jiang Li^a ; ^{lijiang@mail.sic.ac.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Tb ; YAG transparent ceramics ; Microstructure ; Fluorescence property ; Solid-state reactive sintering
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：42
• 期：12
• 页码：13812-13818
• 全文大小：2864 K

文摘

Terbium doped yttrium aluminum garnet (Tb:YAG) transparent ceramics with different doping concentrations were fabricated by the solid-state reaction method using commercial Y₂O₃, α-Al₂O₃ and Tb₄O₇ powders as raw materials. Samples sintered at 1750 °C for 20 h were utilized to observe the optical transmittance, microstructure and fluorescence characteristics. It is found that all the Tb: YAG ceramics with different doping concentrations exhibit homogeneous structures with grain size distributions around 22–29 µm. For the 5 at% Tb:YAG transparent ceramics, the grain boundaries are clean with no secondary phases. The photoluminescence spectra show that Tb:YAG ceramics emit predominantly at 544 nm originated from the energy levels transition of ⁵D₄→⁷F₅ of Tb³⁺ ions, and the intensity of the emission peak reaches a maximum value when the Tb³⁺ concentration is 5 at%. The in-line transmittance of the 5 at% Tb:YAG ceramics is 73.4% at the wavelength of 544 nm, which needs to be further enhanced by optimizing the fabrication process. We think that Tb:YAG transparent ceramics may have potential applications in the high-power white LEDs.