[10p-E202-1~14] 15.1 Bulk crystal growth

2:00 PM - 2:15 PM JST(5:00 AM - 5:15 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation Award

[10p-E202-3] Growth and Optical Properties of Tm³⁺-Doped (Lu,Y,Sc)₂O₃ and (Lu,Gd,Sc)₂O₃ Single Crystals

〇(M1)Ryosuke Takahashi^1,2, Satoshi Ishizawa², Yuka Abe⁵, Takahiko Horiai⁶, Masao Yoshino², Rikito Murakami⁴, Kei Kamada^3,4, Yuui Yokota⁷, Yoshikawa Akira^2,3,4 (1.Grad. Sch. of Eng., Tohoku Univ., 2.IMR, 3.C&A corporation, 4.NICHe, 5.Inst. of Low Temp. and Struct. Res., 6.AIST, 7.IMCE)

Keywords:

Optical thermometry,sesquioxide,micro-pulling-down method using a W crucible

Optical thermometry is promising for non-contact temperature measurement in extreme environments. To avoid blackbody radiation interference at high temperatures, short-wavelength emission is required. In this study, we focused on Tm³⁺ and successfully grew Tm-doped (Lu,Y,Sc)₂O₃ and (Lu,Gd,Sc)₂O₃ single crystals using the micro-pulling-down method with a W crucible. Photoluminescence measurements under 361 nm excitation revealed multiple emission peaks derived from the 4f-4f transitions of Tm³⁺. Specifically, strong blue emissions around 457 nm and 462 nm corresponding to the ¹D₂→³F₄ transition, and red emissions around 650 nm corresponding to the ¹G₄→³F₄ transition were observed. By evaluating the temperature-dependent changes in emission intensity and spectral shape, this study discusses their utility as highly sensitive optical thermometer materials.