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Bhupendra Joshi,KSHETRI YUWARAJ KHATRI,Gobinda Gyawali,이수원 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.3
The novel Er3+ and Yb3+ doped transparent Sialon ceramics were fabricated by hot pressing sintering method as a nearinfrared (NIR) as well as visible luminescent material. The optical transmittance, down-conversion luminescence and NIRluminescence were investigated. The samples show around 30% transmittance in visible region whereas 70% in IR regionaround 3000 nm. The samples were excited within the range of 350-400 nm wavelength, the highest emission was in greenregion (~ 550 nm). Also, the upconversion luminescence depending upon the thicknesses of the samples in the green and redregion have been investigated. The NIR luminescence was observed around 1524 nm wavelength under 980 nm wavelengthirradiation. The decay time profiles have been investigated for higher Er3+ concentration and higher Yb3+ co-doped with Er3+α-Sialon samples. In this study, the addition of Yb3+ has poor sensitizing effect on Er3+ ion to enhance the luminescence.