| Budget Amount *help |
¥17,810,000 (Direct Cost: ¥13,700,000、Indirect Cost: ¥4,110,000)
Fiscal Year 2023: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2022: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2021: ¥5,980,000 (Direct Cost: ¥4,600,000、Indirect Cost: ¥1,380,000)
Fiscal Year 2020: ¥7,020,000 (Direct Cost: ¥5,400,000、Indirect Cost: ¥1,620,000)
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| Outline of Final Research Achievements |
Mn4+-doped and Eu3+-doped red phosphors have attracted much attention as white LED phosphors because of the sharp red line luminescence. However, the temperature quenching in these red phosphors is still not elucidated in detail. In this study, we try to demonstrate the existence of hole transfer quenching. In the prepared Y2O2S:Eu3+, the thermoluminescence excitation (TLE) spectra at different charging temperatures were investigated. As a result, the hole transfer from the excited state of Eu3+ was observed. From the relationship between the temperature dependence of the luminescence intensity and TLE spectra, we successfully demonstrate the hole thermal ionization quenching process.
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