| Project/Area Number |
20F40051
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| Research Category |
Grant-in-Aid for JSPS Fellows
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| Allocation Type | Single-year Grants |
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| Section | 外国 |
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| Review Section |
Basic Section 26020:Inorganic materials and properties-related
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| Research Institution | Kyoto University |
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Principal Investigator |
田部 勢津久 京都大学, 人間・環境学研究科, 教授 (20222119)
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| Co-Investigator(Kenkyū-buntansha) |
ZHENG RUILIN 京都大学, 人間・環境学研究科(研究院), 外国人特別研究員
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| Project Period (FY) |
2020-11-13 – 2023-03-31
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| Project Status |
Completed (Fiscal Year 2022)
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| Budget Amount *help |
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 2022: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2021: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2020: ¥200,000 (Direct Cost: ¥200,000)
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| Keywords | ペロブスカイト / 結晶化ガラス / 量子ドット / ハロゲン化物 / 波長シフト / 相転移 / 蛍光 |
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| Outline of Research at the Start |
近年，ペロブスカイト構造のCsPbX3組成（Xはハロゲン）の蛍光体が，高い量子効率とその発光線幅の狭さからカラーディスプレイバックライト用蛍光体として注目を集めている．しかし耐熱性や化学的耐久性では酸化物材料に比べ劣るのが現状である．ダイオードからの発熱で蛍光体温度が200℃近くにまで上がると，蛍光体量子効率の温度消光，効率低下が問題となる．本研究では高熱伝導率酸化物ガラス中に複数のペロブスカイト蛍光体結晶を分散させることにより，複合材部分の放熱性を向上させ，発光デバイスの温度安定性と化学的耐久性を高める事を目指す．
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| Outline of Annual Research Achievements |
Mixed-halide perovskites have attracted great attention in applications of lighting and photovoltaic devices due to their excellent properties. Understanding the phase segregation mechanism of mixed-halide perovskite has significance for suppressing the performance degradation of optoelectronic devices. Herein, we investigate the mixed-halide perovskite nanocrystals (NCs) in isolation from the external factors (oxygen, moisture, and pressure) using glass encapsulation, which shows excellent photostability against phase segregation. By monitoring the structural evolution of the NCs in glass matrices, the coexisting phase segregation and amorphization of mixed-halide perovskites are observed in real-time. The results show that thermal-induced local temperature increase plays a dominant role in the phase segregation of mixed-halide perovskite NCs. The recovery process is driven by the spontaneous crystallization of the amorphous mixed-halide phase. The clarified dynamic equilibrium process between the compositional segregation (mixing) and structural disorder (order) gives us a better insight into the reversible phase segregation mechanism of mixed-halide perovskite.
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| Research Progress Status |
令和4年度が最終年度であるため、記入しない。
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| Strategy for Future Research Activity |
令和4年度が最終年度であるため、記入しない。
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