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

Hao Yang, Jochen Bruckbauer, Lyudmila Kanibolotskaya, Alexander L. Kanibolotsky, Joseph Cameron, David J. Wallis, Robert W. Martin, Peter J. Skabara

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)
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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.
Original languageEnglish
Pages (from-to)9984-9995
Number of pages12
JournalJournal of Materials Chemistry. C
Issue number29
Early online date7 Jul 2023
Publication statusPublished - 7 Aug 2023


  • blue light-emitting diodes
  • white light-emitting diode
  • hybrid LEDs


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