Efficient and Saturated Red Light-Emitting Electrochemical Cells Based on Cationic Iridium(III) Complexes with EQE up to 9.4 .
electroluminescence
external quantum efficiency
iridium complexes
light-emitting electrochemical cells
red light emission
Journal
Chemistry (Weinheim an der Bergstrasse, Germany)
ISSN: 1521-3765
Titre abrégé: Chemistry
Pays: Germany
ID NLM: 9513783
Informations de publication
Date de publication:
28 Oct 2019
28 Oct 2019
Historique:
received:
24
06
2019
revised:
06
08
2019
pubmed:
11
8
2019
medline:
11
8
2019
entrez:
11
8
2019
Statut:
ppublish
Résumé
Solid-state light-emitting electrochemical cells (LECs) have several advantages, such as low-voltage operation, compatibility with inert metal electrodes, large-area flexible substrates, and simple solution-processable device architectures. However, most of the studies on saturated red LECs show low or moderate device efficiencies (external quantum efficiency (EQE) <3.3 %). In this work, we demonstrate a series of five red-emitting cationic iridium complexes (RED1--RED5) with 2,2'-biquinoline ligands and test their electroluminescence (EL) characteristics in LECs. The Commission Internationale de l'Eclairage (CIE) 1931 coordinates for the LECs based on these complexes are all beyond the National Television System Committee (NTSC) red standard point (0.67, 0.33). The maximal EQE of the neat-film RED1-based LECs reaches 7.4 %. The reddest complex, RED3, is doped in the blue-emitting host complex, BG, to fabricate host-guest LECs. The maximal EQE of the host-guest LECs (1 wt % complex RED3) reaches 9.4 %, which is among the highest reported for the saturated red LECs.
Identifiants
pubmed: 31400031
doi: 10.1002/chem.201902887
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
13748-13758Subventions
Organisme : Ministry of Science and Technology, Taiwan
ID : 107-2113-M-126-004-MY2
Organisme : Ministry of Science and Technology, Taiwan
ID : 107-2221-E-009-112-MY3
Informations de copyright
© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.
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