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Deep blue exciplex organic light-emitting diodes with enhanced efficiency ; P-type or E-type triplet conversion to singlet excitons?

Jankus, Vygintas and Chiang, Chien-Jung and Dias, Fernando and Monkman, Andrew P. (2013) 'Deep blue exciplex organic light-emitting diodes with enhanced efficiency ; P-type or E-type triplet conversion to singlet excitons?', Advanced materials., 25 (10). pp. 1455-1459.

Abstract

Simple trilayer, deep blue, fluorescent exciplex organic light-emitting diodes (OLEDs) are reported. These OLEDs emit from an exciplex state formed between the highest occupied molecular orbital (HOMO) of N,N′-bis(1-naphthyl)N,N′-diphenyl-1,1′-biphenyl-4,4′-diamine (NPB) and lowest unoccupied molecular orbital (LUMO) of 1,3,5-tri(1-phenyl-1H-benzo[d]imidazol-2-yl)phenyl (TPBi) and the NPB singlet manifold, yielding 2.7% external quantum efficiency at 450 nm. It is shown that the majority of the delayed emission in electroluminescence arises from P-type triplet fusion at NPB sites not E-type reverse intersystem crossing because of the presence of the NPB triplet state acting as a deep trap.

Item Type:Article
Full text:(AM) Accepted Manuscript
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Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1002/adma.201203615
Publisher statement:This is the peer reviewed version of the following article: ankus, V., Chiang, C.-J., Dias, F. and Monkman, A. P. (2013), Deep Blue Exciplex Organic Light-Emitting Diodes with Enhanced Efficiency; P-type or E-type Triplet Conversion to Singlet Excitons?. Advanced Materials, 25 (10): 1455-1459, which has been published in final form at http://dx.doi.org/10.1002/adma.201203615. This article may be used for non-commercial purposes in accordance With Wiley-VCH Terms and Conditions for self-archiving.
Record Created:25 Jun 2014 17:05
Last Modified:16 May 2016 11:41

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