Deep Blue Exciplex Organic Light-Emitting Diodes with Enhanced Efficiency; P-type or E-type Triplet Conversion to Singlet Excitons?

Jankus, Vygintas; Chiang, Chien-Jung; Dias, Fernando; Monkman, Andrew P.

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.

Citation

Jankus, V., Chiang, C., Dias, F., & 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. https://doi.org/10.1002/adma.201203615

• Journal Article Type: Article
• Publication Date: Mar 13, 2013
• Deposit Date: May 31, 2013
• Publicly Available Date: Jun 26, 2014
• Journal: Advanced Materials
• Print ISSN: 0935-9648
• Electronic ISSN: 1521-4095
• Publisher: Wiley
• Peer Reviewed: Peer Reviewed
• Volume: 25
• Issue: 10
• Pages: 1455-1459
• DOI: https://doi.org/10.1002/adma.201203615
• Public URL: https://durham-repository.worktribe.com/output/1451488