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Spacer Cation Alloying in Ruddlesden–Popper Perovskites for Efficient Red Light-Emitting Diodes with Precisely Tunable Wavelengths

Qing, Jian ; Ramesh, Sankaran LU orcid ; Xu, Qiang ; Liu, Xiao-Ke ; Wang, Heyong ; Yuan, Zhongcheng ; Chen, Zhan ; Hou, Lintao ; Sum, Tze Chien and Gao, Feng (2021) In Advanced Materials 33(49).
Abstract

Perovskite light-emitting diodes (PeLEDs) have recently shown significant progress with external quantum efficiencies (EQEs) exceeding 20%. However, PeLEDs with pure-red (620−660 nm) light emission, an essential part for full-color displays, remain a great challenge. Herein, a general approach of spacer cation alloying is employed in Ruddlesden–Popper perovskites (RPPs) for efficient red PeLEDs with precisely tunable wavelengths. By simply tuning the alloying ratio of dual spacer cations, the thickness distribution of quantum wells in the RPP films can be precisely modulated without deteriorating their charge-transport ability and energy funneling processes. Consequently, efficient PeLEDs with tunable emissions between pure red (626 nm)... (More)

Perovskite light-emitting diodes (PeLEDs) have recently shown significant progress with external quantum efficiencies (EQEs) exceeding 20%. However, PeLEDs with pure-red (620−660 nm) light emission, an essential part for full-color displays, remain a great challenge. Herein, a general approach of spacer cation alloying is employed in Ruddlesden–Popper perovskites (RPPs) for efficient red PeLEDs with precisely tunable wavelengths. By simply tuning the alloying ratio of dual spacer cations, the thickness distribution of quantum wells in the RPP films can be precisely modulated without deteriorating their charge-transport ability and energy funneling processes. Consequently, efficient PeLEDs with tunable emissions between pure red (626 nm) and deep red (671 nm) are achieved with peak EQEs up to 11.5%, representing the highest values among RPP-based pure-red PeLEDs. This work opens a new route for color tuning, which will spur future developments of pure-red or even pure-blue PeLEDs with high performance.

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author
; ; ; ; ; ; ; ; and
publishing date
type
Contribution to journal
publication status
published
subject
keywords
electroluminescence, light-emitting diodes, pure red, Ruddlesden–Popper perovskites, spacer cation
in
Advanced Materials
volume
33
issue
49
article number
2104381
publisher
John Wiley & Sons Inc.
external identifiers
  • scopus:85116807717
ISSN
0935-9648
DOI
10.1002/adma.202104381
language
English
LU publication?
no
additional info
Publisher Copyright: © 2021 The Authors. Advanced Materials published by Wiley-VCH GmbH
id
aa8e72f0-742a-4926-8bcd-17dc1c352ba8
date added to LUP
2023-02-15 22:04:40
date last changed
2023-03-02 12:33:03
@article{aa8e72f0-742a-4926-8bcd-17dc1c352ba8,
  abstract     = {{<p>Perovskite light-emitting diodes (PeLEDs) have recently shown significant progress with external quantum efficiencies (EQEs) exceeding 20%. However, PeLEDs with pure-red (620−660 nm) light emission, an essential part for full-color displays, remain a great challenge. Herein, a general approach of spacer cation alloying is employed in Ruddlesden–Popper perovskites (RPPs) for efficient red PeLEDs with precisely tunable wavelengths. By simply tuning the alloying ratio of dual spacer cations, the thickness distribution of quantum wells in the RPP films can be precisely modulated without deteriorating their charge-transport ability and energy funneling processes. Consequently, efficient PeLEDs with tunable emissions between pure red (626 nm) and deep red (671 nm) are achieved with peak EQEs up to 11.5%, representing the highest values among RPP-based pure-red PeLEDs. This work opens a new route for color tuning, which will spur future developments of pure-red or even pure-blue PeLEDs with high performance.</p>}},
  author       = {{Qing, Jian and Ramesh, Sankaran and Xu, Qiang and Liu, Xiao-Ke and Wang, Heyong and Yuan, Zhongcheng and Chen, Zhan and Hou, Lintao and Sum, Tze Chien and Gao, Feng}},
  issn         = {{0935-9648}},
  keywords     = {{electroluminescence; light-emitting diodes; pure red; Ruddlesden–Popper perovskites; spacer cation}},
  language     = {{eng}},
  month        = {{12}},
  number       = {{49}},
  publisher    = {{John Wiley & Sons Inc.}},
  series       = {{Advanced Materials}},
  title        = {{Spacer Cation Alloying in Ruddlesden–Popper Perovskites for Efficient Red Light-Emitting Diodes with Precisely Tunable Wavelengths}},
  url          = {{http://dx.doi.org/10.1002/adma.202104381}},
  doi          = {{10.1002/adma.202104381}},
  volume       = {{33}},
  year         = {{2021}},
}