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

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Yang, Hao and Bruckbauer, Jochen and Kanibolotskaya, Lyudmila and Kanibolotsky, Alexander L. and Cameron, Joseph and Wallis, David J. and 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, 11 (29). pp. 9984-9995. ISSN 2050-7526 (https://doi.org/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.

ORCID iDs

Yang, Hao, Bruckbauer, Jochen ORCID logoORCID: https://orcid.org/0000-0001-9236-9320, Kanibolotskaya, Lyudmila, Kanibolotsky, Alexander L., Cameron, Joseph, Wallis, David J., Martin, Robert W. ORCID logoORCID: https://orcid.org/0000-0002-6119-764X and Skabara, Peter J.;
  • Item type:Article
    ID code:86094
    Dates:
    Date
    Event
    7 August 2023
    Published
    7 July 2023
    Published Online
    24 April 2023
    Accepted
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:11 Jul 2023 07:47
    Last modified:27 Nov 2024 14:11
    URI:https://strathprints.strath.ac.uk/id/eprint/86094
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