A cross-linkable, organic down-converting material for white light emission from hybrid LEDs

Yang, Hao, Bruckbauer, Jochen, Kanibolotska, Lyudmyla, Kanibolotsky, Alexander L., Cameron, Joseph, Wallis, David J. ORCID: https://orcid.org/0000-0002-0475-7583, Martin, Robert W. and Skabara, Peter J. 2023. A cross-linkable, organic down-converting material for white light emission from hybrid LEDs. Journal of Materials Chemistry C Materials for optical and electronic devices 11 (29) , pp. 9984-9995. 10.1039/D2TC05139G

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Abstract

The use of organic materials and the replacement of rare-earth elements in the making of light-emitting devices has been increasingly popular over the last decades. Herein, the synthesis and characterisation of a novel organic green-emitting material (GreenCin), based on a fluorene-benzothiadiazole-fluorene (Flu-BT-Flu) core structure, and its performance as a down-converting layer in tandem with commercial blue light-emitting diodes (LEDs) for white light emission are reported. This material has been functionalised with cinnamate-groups to enable the emissive material to react with the cross-linker tetra(cinnamoyloxymethyl)methane (TCM), to produce stable films with high performance in hybrid LEDs. The hybrid devices can generate white light with a good colour rendering index (CRI) of 69. The hybrid devices also have ×2.6 increased luminous efficacy (107 lm W−1) and ×2.4 increased radiant flux (24 mW) when compared with hybrid devices using non-cross-linked analogues of GreenCin. Additionally, the hybrid devices containing GreenCin have a high blue-to-white efficacy value (defined by dividing the luminous flux of a hybrid device by the radiant flux of the underlying blue LED), of 213 lm W−1, for which inorganic phosphors have values in the range of 200–300 lm W−1

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Publisher:	Royal Society of Chemistry
ISSN:	2050-7526
Date of First Compliant Deposit:	25 April 2023
Date of Acceptance:	24 April 2023
Last Modified:	07 Sep 2023 22:01
URI:	https://orca.cardiff.ac.uk/id/eprint/159040

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