[19a-131-1~11] 15.7 Crystal characterization, impurities and crystal defects

[19a-131-2] Optical Property of Compound Fluoride Materials Ca_xSr_1-xF₂ at Room/Low Temperature

〇Kentaro Suzuki¹, Jun Otani¹, Shingo Ono¹, Masahiko Kase² (1.NITech, 2.USHIO INC.)

Keywords:compound fluoride materials, VUV detector

In this presentation, we report on the evaluation of optical properties of Ca_xSr_1-xF₂ from room temperature to cryogenic temperature. We also fabricated a sensor using this material and controlled response sensitivity. I measured the transmittance of Ca_xSr_1-xF₂ crystal from room temperature to cryogenic temperature, and calculated the band gap from it. As a result, we confirmed that the band gap increases as the proportion of Ca in the crystal increases at both room temperature and cryogenic temperature. Therefore, we succeeded in band gap control using complex fluoride Ca_xSr_1-xF₂.