Dimensional, Interface and Optical Engineering for Efficient Blue and White Perovskite Light-Emitting Devices
Hin-Lap Yip a
a State Key Laboratory of Luminescent Materials and Devices, School of Materials Science and Engineering, South China University of Technology, Guangzhou, China
nanoGe Perovskite Conferences
Proceedings of International online conference on Hybrid materials and optoelectronic devices (HYBRIDOE)
Online, Spain, 2020 December 15th - 17th
Organizers: Xueqing Xu, Baomin Xu, Hin-Lap (Angus) Yip and Xinhua Zhong
Invited Speaker, Hin-Lap Yip, presentation 015
DOI: https://doi.org/10.29363/nanoge.hybridoe.2020.015
Publication date: 4th December 2020

Metal halide perovskite light-emitting diodes (PeLEDs) show great potentials to be the next-generation lighting technology, with external quantum efficiencies (EQEs) exceeding 20% for infrared, red and green LEDs. However, the efficiencies of blue and white devices severely lag behind. To improve the performance of blue PeLEDs, we employed an integrated strategy combining dimensional engineering of perovskite film and recombination zone modulation in the LED device to obtain an EQE up to 5 %.[1] While further incorporating the strategy of interfacial engineering, highly efficient blue PeLEDs with EQEs over 10% have been successfully realized in our group, establishing an excellent platform for white-light emission. In our latest work, we demonstrated  efficient white PeLEDs by optically coupling a blue PeLED with a red emitting perovskite nanocrystal layer in an advanced device structure, which allows to extract the trapped optical modes (waveguide and SPP modes) of blue photons in the device to the red perovskite layer via near-field effects. As a result, a white PeLEDs with EQE over 10% is achieved, which represents the state-of-the-art performance for white PeLEDs.

 

References:

[1] Z. Li, Z. Chen, H.-L. Yip* et al. Nat. Commun. 2019, 10, 1027; Z. Chen, H.-L. Yip* et al. Adv. Mater. 2017, 29, 1603157.

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