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

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

Science Advances

10.1126/sciadv.adp9595

https://doi.org/10.1126/sciadv.adp9595

Ligang Wang, Zher Ying Ooi, Feng-Yan Jia, Yuqi Sun, Yun Liu, Linjie Dai, Junzhi Ye, Jincan Zhang, Hio-Ieng Un, Yu-Hsien Chiang, Sanyang Han, Alessandro James Mirabelli, Miguel Anaya, Zhilong Zhang, Yang Lu, Chen Zou, Baodan Zhao, Dawei Di, Xiaodong Yang, Dengyang Guo, Yu Tan, Hao Dong, Shaocheng Liu, Tianjun Liu, Huanping Zhou, Samuel D. Stranks, Ling-Dong Sun, Chun-Hua Yan, Richard H. Friend

General Materials Science

14 February 2025

Wang, L., Ooi, Z. Y., Jia, F.-Y., Sun, Y., Liu, Y., Dai, L., Ye, J., Zhang, J., Un, H.-I., Chiang, Y.-H., Han, S., Mirabelli, A. J., Anaya, M., Zhang, Z., Lu, Y., Zou, C., Zhao, B., Di, D., Yang, X., et al. (2025). Efficient perovskite LEDs with tailored atomic layer number emission at fixed wavelengths. Science Advances, 11(7). https://doi.org/10.1126/sciadv.adp9595

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.

Attribution 4.0 International (CC BY 4.0)

This research / project is supported by the A*STAR - A*STAR Young Achiever Award
Grant Reference no. : NA

https://oar.a-star.edu.sg/communities-collections/articles/23274

2375-2548

Institute of High Performance Computing 

https://doi.org/10.1126/sciadv.adp9595