Issue 3, 2020

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

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 GaN-based LED. Crucially, the solution-state emissive performance is generally maintained when encapsulated at low concentrations within this resin. A maximum luminous efficacy of 87 lm W−1 was demonstrated using a 1.0 mg ml−1 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.

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

Supplementary files

Article information

Article type
Research Article
Submitted
20 Dez 2019
Accepted
05 Feb 2020
First published
06 Feb 2020
This article is Open Access
Creative Commons BY license

Mater. Chem. Front., 2020,4, 1006-1012

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

A. A. Wiles, J. Bruckbauer, N. Mohammed, M. Cariello, J. Cameron, N. J. Findlay, E. Taylor-Shaw, D. J. Wallis, R. W. Martin, P. J. Skabara and G. Cooke, Mater. Chem. Front., 2020, 4, 1006 DOI: 10.1039/C9QM00771G

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