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Efficient blue light-emitting diodes based on quantum-confined bromide perovskite nanostructures

Efficient blue light-emitting diodes based on quantum-confined bromide perovskite nanostructures The emergence of inorganic–organic hybrid perovskites, a unique class of solution-processable crystalline semiconductors, provides new opportunities for large-area, low-cost and colour-saturated light-emitting diodes (LEDs) ideal for display and solid-state lighting applications 1 . However, the performance of blue perovskite LEDs (PeLEDs) 2–11 is far inferior to that of their near-infrared, red and green counterparts 12–19 , strongly limiting the practicality of the PeLED technology. Here, we demonstrate blue PeLEDs emitting at 483 nm with colour coordinates of (0.094, 0.184) and operating with a peak external quantum efficiency of up to 9.5% at a luminance of 54 cd m–2. The devices have a T 50 lifetime of 250 s for an initial brightness of 100 cd m–2. The efficient blue electroluminescence originates from a structure of quantum-confined perovskite nanoparticles embedded within quasi-two-dimensional phases with higher bandgaps, prepared by an antisolvent processing scheme. Our work paves the way towards high-performance PeLEDs in the blue region. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Nature Photonics Springer Journals

Efficient blue light-emitting diodes based on quantum-confined bromide perovskite nanostructures

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References (38)

Publisher
Springer Journals
Copyright
Copyright © 2019 by The Author(s), under exclusive licence to Springer Nature Limited
Subject
Physics; Physics, general; Applied and Technical Physics; Quantum Physics
ISSN
1749-4885
eISSN
1749-4893
DOI
10.1038/s41566-019-0505-4
Publisher site
See Article on Publisher Site

Abstract

The emergence of inorganic–organic hybrid perovskites, a unique class of solution-processable crystalline semiconductors, provides new opportunities for large-area, low-cost and colour-saturated light-emitting diodes (LEDs) ideal for display and solid-state lighting applications 1 . However, the performance of blue perovskite LEDs (PeLEDs) 2–11 is far inferior to that of their near-infrared, red and green counterparts 12–19 , strongly limiting the practicality of the PeLED technology. Here, we demonstrate blue PeLEDs emitting at 483 nm with colour coordinates of (0.094, 0.184) and operating with a peak external quantum efficiency of up to 9.5% at a luminance of 54 cd m–2. The devices have a T 50 lifetime of 250 s for an initial brightness of 100 cd m–2. The efficient blue electroluminescence originates from a structure of quantum-confined perovskite nanoparticles embedded within quasi-two-dimensional phases with higher bandgaps, prepared by an antisolvent processing scheme. Our work paves the way towards high-performance PeLEDs in the blue region.

Journal

Nature Photonics – Springer Journals

Published: Aug 19, 2019

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