Science advances · 2025
Efficient perovskite LEDs with tailored atomic layer number emission at fixed wavelengths.
СтатьяНазвание и аннотация: Перевод в очереди
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Wang Ligang, Ooi Zher Ying, Jia Feng-Yan, Sun Yuqi, Liu Yun, Dai Linjie, Ye Junzhi, Zhang Jincan, Un Hio-Ieng, Chiang Yu-Hsien, Han Sanyang, Mirabelli Alessandro James, Anaya Miguel, Zhang Zhilong, Lu Yang, Zou Chen, Zhao Baodan, Di Dawei, Yang Xiaodong, Guo Dengyang, Tan Yu, Dong Hao, Liu Shaocheng, Liu Tianjun, Zhou Huanping, Stranks Samuel D, Sun Ling-Dong, Yan Chun-Hua, Friend Richard H
Аннотация
Colloidal quantum dots (QDs) have illuminated computer monitors and television screens due to their fascinating color-tunable properties depending on the size. Here, the electroluminescence (EL) wavelength of perovskite LEDs was tuned via the atomic layer number (ALN) of nanoplates (NPs) instead of the "size" in conventional QDs. We demonstrated efficient LEDs with controllably tailored emission from n = 3, 4, 5, and ≥7 ALN perovskite NPs with specific and discrete major peaks at 607, 638, 669, and 728 nanometers. These LEDs demonstrated peak external quantum efficiency (EQE) of 26.8% and high wavelength reproducibility with less than 1 to 2 nm difference between batches. High color stability without observable EL spectral change and operating stability with the best T50 of 267 minutes at 1.0 milliampere per square centimeter was also achieved. This work demonstrates a concept of tailoring specific ALN emission with fixed wavelengths, shedding light on efficient, emission-discrete, and color-stable LEDs for next-generation display.