Fabrication and properties of transparent Tb:YAG fluorescent ceramics with different doping concentrations. Issue 12 (September 2016)

• Record Type: Journal Article
• Authors: Dai, Jiawei; Cao, Maoqing; Kou, Huamin; Pan, Yubai; Guo, Jingkun; Li, Jiang
• Is Part Of: Ceramics international. Volume 42:Issue 12(2016)
• Page Start: 13812
• Page End: 13818
• Publication Date: 2016-09
• Subjects: Tb:YAG transparent ceramics -- Microstructure -- Fluorescence property -- Solid-state reactive sintering; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2016.05.183
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Terbium doped yttrium aluminum garnet (Tb:YAG) transparent ceramics with different doping concentrations were fabricated by the solid-state reaction method using commercial Y2 O3, α-Al2 O3 and Tb4 O7 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 5 D4 → 7 F5 of Tb 3+ ions, and the intensity of the emission peak reaches a maximum value when the Tb 3+ 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.