| 학회 |
한국재료학회 |
| 학술대회 |
2021년 가을 (11/24 ~ 11/26, 경주 라한호텔) |
| 권호 |
27권 2호 |
| 발표분야 |
F. 광기능/디스플레이 재료 분과 |
| 제목 |
Thermally-deposited all inorganic perovskite light emitting diodes with performance enhancing PEO layer |
| 초록 |
Halide perovskite has been reported as the next generation materials for light-emitting diodes (LEDs) due to having narrow emission with a small full width at half maxima (FWHM) and tunable bandgap by adjusting the halide components. Although most perovskite LEDs are manufactured by a solution process, the vacuum deposition process is suitable for large-scale mass production. Here we show a high-performance thermally-deposited perovskite LEDs by introducing a separate polymer passivation layer. The perovskite film deposited on the poly(ethylene oxide)(PEO) layer shows a significant improvement in photoluminescence (PL) intensity compared to the reference sample without the PEO layer, which is due to the passivation of interfacial defects in perovskite. However, it was difficult to apply the polymer layer directly to LED devices because of the electrical insulation of PEO. We solved this charge transport issue by doping the PEO with an alkali salt. This strategy resulted in an increased luminance and external quantum efficiency (EQE) up to 7486 cd/m2 and 6.6%, respectively. Details of the materials characterization and device analysis will be discussed. |
| 저자 |
김나경, 신민규, 김준연, 박진우, 전성문, 조용훈, 신병하
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| 소속 |
KAIST |
| 키워드 |
CsPbBr<SUB>3</SUB>; vacuum deposition; perovskite LED
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| E-Mail |
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