title: Near-infrared polymer light-emitting diodes based on low-energy gap oligomers copolymerized into a high-gap polymer host.
abstract: Near-infrared (NIR) polymer light-emitting diodes (PLEDs) based on a fluorene-dioctyloxyphenylene wide-gap host material copolymerized with a low-gap emitter are presented. Various loadings (1, 2.5, 10, 20 mol%) of the low-gap emitter are studied, with higher loadings leading to decreased efficiencies likely due to aggregation effects. While the 10 mol% loading resulted in almost pure NIR emission (>99.6%), the 1 mol% loading yielded optimum device performance, which is among the best reported to date for a unblended single-layer pure polymer emitter, with an external quantum efficiencies of 0.04% emitting at 909 nm. The high spectral purity of the PLEDs combined with their performance support the methodology of copolymerization as an effective strategy for developing NIR PLEDs.
authors.affiliation: Department of Chemical and Biological Engineering, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden.
authors.forename: Timothy T
authors.initials: TT
authors.lastname: Steckler
authors.forename: Oliver
authors.initials: O
authors.lastname: Fenwick
authors.forename: Toby
authors.initials: T
authors.lastname: Lockwood
authors.forename: Mats R
authors.initials: MR
authors.lastname: Andersson
authors.forename: Franco
authors.initials: F
authors.lastname: Cacialli
mesh_terms: D007259:Infrared Rays; D058105:Polymerization / Q000528:radiation effects; D011108:Polymers / Q000138:chemical synthesis / Q000737:chemistry*
chemical_list: D011108:Polymers; C530353:glycidyl azide polymer