| 학회 |
한국공업화학회 |
| 학술대회 |
2022년 봄 (05/11 ~ 05/13, 제주국제컨벤션센터(ICC JEJU)) |
| 권호 |
26권 1호 |
| 발표분야 |
포스터-무기재료 |
| 제목 |
Highly Emissive Blue Quantum Dots with Superior Thermal Stability via In Situ Surface Reconstruction of Mixed CsPbBr3-Cs4PbBr6 Nanocrystals |
| 초록 |
Although metal halide perovskites are candidate high-performance light-emitting diode (LED) materials, blue perovskite LEDs are problematic: phase segregation of mixed-halide materials and low stability of Br-based perovskite quantum dots (QDs). Herein, we report a strategy for highly efficient, stable CsPbBr3 QDs via in situ surface reconstruction of CsPbBr3-Cs4PbBr6 nanocrystals (NCs). By controlling precursor reactivity, a high photoluminescence quantum yield (PLQY) of >90% at 470 nm was obtained because CsPbBr3 QD surface defects were removed by the Cs4PbBr6 NCs. The defect-engineered QDs exhibited high colloidal stability and thermal stability at 120 °C. Blue LEDs fabricated from CsPbBr3 QDs with reconstructed surfaces exhibit a maximum external quantum efficiency of 4.65% at 480 nm and excellent spectral stability. |
| 저자 |
김현중1, 박종현2, 김강용2, 이동렬2, 장양필2, 박정식2, 송명훈2, 박종남3
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| 소속 |
1(주)UNIQDOT / 울산과학기술원, 2울산과학기술원, 3울산과학기술원 / (주)UNIQDOT |
| 키워드 |
perovskites; blue quantum dots; surface reconstruction; thermal stability; light-emitting diodes
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| E-Mail |
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