Efficient perovskite LEDs with tailored atomic layer number emission at fixed wavelengths

作者：Ligang Wang, Zher Ying Ooi, Fengyan Jia, Yuqi Sun, Yun Liu, Linjie Dai, Junzhi Ye, Jincan Zhang, Hio‐Ieng Un, Yu‐Hsien Chiang, Sanyang Han, Alessandro J. Mirabelli, Miguel Anaya, Zhilong Zhang, Yang Lu, Chen Zou, Baodan Zhao, Dawei Di, Xiaodong Yang, Dengyang Guo, Tan Yu, Hao Dong, Shaocheng Liu, Tianjun Liu, Huanping Zhou, Samuel D. Stranks, Ling‐Dong Sun, Chun‐Hua Yan, Richard H. Friend · 发表于：Science Advances · 年份：2025 · DOI：10.1126/sciadv.adp9595 · 被引用次数：19 · 研究领域：Perovskite Materials and Applications、Quantum Dots Synthesis And Properties、Organic Light-Emitting Diodes Research

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 T 50 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.