| 학회 |
한국공업화학회 |
| 학술대회 |
2022년 봄 (05/11 ~ 05/13, 제주국제컨벤션센터(ICC JEJU)) |
| 권호 |
26권 1호 |
| 발표분야 |
포스터-디스플레이 |
| 제목 |
In situ cadmium surface passivation of perovskite nanocrystals for blue LEDs |
| 초록 |
Perovskite light emitting diodes (PeLEDs) are attracting attention as next-generation displays. However the low efficiencies and poor stability of blue PeLEDs are the major hurdles. We report an in situ surface engineering strategy incorporating hot injection method with one pot synthesis for surface passivation of cadmium ions(Cd2+) into blue-emissive all-inorganic perovskite nanocrystals(PNCs). The optimized PNCs containing 0.2% Cd show improved photoluminescence quantum yield(66.8%) and ambient stability compared to the neat PNCs (25.5%) at an emission wavelength of 475nm. PeLEDs with the PNCs show a luminance of 51cd m-2 and external quamtum efficiency of 3.71%. We show that Cd incorporation with reduced dimensionality likely takes place via surface inclusion in the perovskite B-site, which effectively suppresses the formation of halide defects and yields enhanced device efficiencies. |
| 저자 |
석경은1, Woo Hyeon Jeong2, Zhongkai Yu1, Sangwook Wu1, Sung Heum Park1, Jeongjae Lee3, Hyosung Choi2, Bo Ram Lee1
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| 소속 |
1부경대, 2한양대, 3서울대 |
| 키워드 |
blue PeLEDs; PNCs; cadmium; surface passivation
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| E-Mail |
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