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A poly(urethane)-encapsulated benzo[2,3-d:6,7-d’]diimidazole organic down-converter for green hybrid LEDs

Wiles, Alan A., Bruckbauer, Jochen, Mohammed, Nabeel, Cariello, Michele, Camero, Joseph, Findlay, Neil J., Taylor-Shaw, Elaine, Wallis, David J., Martin, Robert W., Skabara, Peter J. and Cooke, Graeme 2020. A poly(urethane)-encapsulated benzo[2,3-d:6,7-d’]diimidazole organic down-converter for green hybrid LEDs. Materials Chemistry Frontiers 4 (3) , pp. 1006-1012. 10.1039/C9QM00771G

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Abstract

The development of organic down-converting materials continues to attract attention in hybrid LED technology by obviating the need for non-sustainable rare-earth elements. In this work, a benzodiimidazole-based system (TPA-BDI) has been employed as a down-converting layer in a hybrid organic-inorganic LED device. A commercially available poly(urethane)-based resin is used as the encapsulating material, providing a dilute layer of TPA-BDI that is deposited on top of the GaNbased LED. Crucially, the solution-state emissive performance is generally maintained when encapsulated at dilute concentrations within this resin. A maximum luminous efficacy of 87 lm/W was demonstrated using a 1.0 mg/ml concentration of TPA-BDI in the resin. The suitability of using organic down-converters to produce green light from hybrid devices was demonstrated by the excellent repeatability of the device characteristics across a series of encapsulated LEDs.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Publisher: Royal Society of Chemistry
ISSN: 2052-1529
Date of First Compliant Deposit: 26 March 2020
Date of Acceptance: 7 February 2020
Last Modified: 07 Apr 2020 13:06
URI: http://orca.cf.ac.uk/id/eprint/130606

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