Development of luminescence center co-doped ceramic phosphor for two-dimensional temperature distribution measurement

2020 Fiscal Year Final Research Report

• Project/Area Number: 19K15296
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 26020:Inorganic materials and properties-related
• Research Institution: National Institute of Advanced Industrial Science and Technology
• Principal Investigator: Shimizu Yuhei 国立研究開発法人産業技術総合研究所, 計量標準総合センター, 研究員 (90828005)
• Project Period (FY): 2019-04-01 – 2021-03-31
• Keywords: 蛍光式温度センサ / 蛍光体 / 応用光計測

Outline of Final Research Achievements

We investigated and evaluated phosphors to be used as temperature sensors for two-dimensional temperature distribution measurement, focusing on the measurement method using the temperature dependence of the luminescence intensity ratio of two wavelength bands. A ceramic phosphor, Y3Al5O12 co-doped with Ce3+ and Yb3+ as luminescence centers, was selected as a candidate material. The luminescence spectra of the phosphor were measured at various temperatures and the intensities of the luminescence from Ce3+ and Yb3+ were evaluated at each temperature. The change in the luminescence intensity ratio as a function of temperature change, which corresponds to the sensitivity of a temperature sensor, varied greatly between 100 ℃ and 200 ℃. The relative sensitivity was found to be approximately 1.4 % K-1 around 150 ℃.

Free Research Field

黒体材料、蛍光体、応用光計測

Academic Significance and Societal Importance of the Research Achievements

Ce3+とYb3+を共添加したY3Al5O12(YAG:Ce-Yb)蛍光体は、利用しやすい身近な光源(波長約450 nmの青色LED光)を用いて励起・発光させることができ、室内光環境下でも十分に視認可能な強度の発光を示す。また、Ce3+とYb3+の発光波長は互いに離れているため、分光器を用いず光学フィルタで容易に各々の発光を分離でき、発光強度比を求めやすい。本研究においてYAG:Ce-Yb蛍光体の発光強度比や感度の情報が得られたことは、今後、蛍光式二次元温度分布測定をより簡易に実現するうえで、重要で意義ある成果である。