Efficient and Spectrally Stable Blue Perovskite Light-Emitting Diodes Employing a Cationic π-Conjugated Polymer.
blue emissions
high efficiencies
ion migrations
perovskite light-emitting diodes
stabilities
Journal
Advanced materials (Deerfield Beach, Fla.)
ISSN: 1521-4095
Titre abrégé: Adv Mater
Pays: Germany
ID NLM: 9885358
Informations de publication
Date de publication:
Nov 2021
Nov 2021
Historique:
revised:
22
08
2021
received:
13
05
2021
pubmed:
25
9
2021
medline:
25
9
2021
entrez:
24
9
2021
Statut:
ppublish
Résumé
Metal halide perovskite semiconductors have demonstrated remarkable potentials in solution-processed blue light-emitting diodes (LEDs). However, the unsatisfied efficiency and spectral stability responsible for trap-mediated non-radiative losses and halide phase segregation remain the primary unsolved challenges for blue perovskite LEDs. In this study, it is reported that a fluorene-based π-conjugated cationic polymer can be blended with the perovskite semiconductor to control film formation and optoelectronic properties. As a result, sky-blue and true-blue perovskite LEDs with Commission Internationale de l'Eclairage coordinates of (0.08, 0.22) and (0.12, 0.13) at the record external quantum efficiencies of 11.2% and 8.0% were achieved. In addition, the mixed halide perovskites with the conjugated cationic polymer exhibit excellent spectral stability under external bias. This result illustrates that π-conjugated cationic polymers have a great potential to realize efficient blue mixed-halide perovskite LEDs with stable electroluminescence.
Identifiants
pubmed: 34558117
doi: 10.1002/adma.202103640
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
e2103640Subventions
Organisme : Chinese Academy of Sciences
ID : KY2060000185
Organisme : National Natural Science Foundation of China
ID : 52103242
Organisme : Natural Science Foundation of China
ID : 91733301
Organisme : Natural Science Foundation of China
ID : 61674109
Organisme : Natural Science Foundation of China
ID : 11675252
Organisme : Natural Science Foundation of China
ID : 11605278
Organisme : National Key R&D Program of China
ID : 2016YFA0202400
Organisme : Engineering and Physical Sciences Research Council
ID : EP/M01083X/1
Organisme : Engineering and Physical Sciences Research Council
ID : EP/M005143/1
Organisme : Simons Foundation
Organisme : European Union's Horizon 2020
ID : 841386
Organisme : European Union's Horizon 2020
ID : 670405
Organisme : European Union's Horizon 2020
ID : 756962 [HYPERION]
Informations de copyright
© 2021 The Authors. Advanced Materials published by Wiley-VCH GmbH.
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