| 학회 |
한국고분자학회 |
| 학술대회 |
2019년 봄 (04/10 ~ 04/12, 부산컨벤션센터(BEXCO)) |
| 권호 |
44권 1호 |
| 발표분야 |
콜로이드 및 분자조립 부문위원회 |
| 제목 |
Correlating nano black spots and optical stability in mixed halide perovskite quantum dots |
| 초록 |
Inorganic lead trihalide perovskites quantem dots (PQDs) are highly efficient emitting materials with sharp emission profiles. Among inorganic lead trihalide PQDs (CsPbX3 where X= Cl-, Br-, I-) usually show the most breathtaking PL-QY (up to 90%) in the primary observations directly after synthesis, but, also show the lowest optical stability, thereby delaying their commercialization. In fact, it takes only a few days to have totally zero-emission when they are left in air at room temperature due to the chemical degradation. The causes of this degradation potentially include factors such as thermal decomposition, light exposure and phase transitions. Our investigations based on TEM and HAADF-TEM reveal that Nano black spots (NBSs) are areas of high concentration of Pb2+ ions on the QDs. We have futher correlated the apprearance of NBSs with change in optical properties of QDs. Tolerance factor can be used to predict optical stability and appearance of NBSs. |
| 저자 |
김경주1, 최신일1, 고윤혁2, PREM PRABHAKARAN1, 이광섭1
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| 소속 |
1한남대, 2한양대 |
| 키워드 |
perovskite quantum dot; nano black spot
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| E-Mail |
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