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

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.

  • 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:15 Apr 2024 05:47
    URI:https://strathprints.strath.ac.uk/id/eprint/86094
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