Yang, H., Bruckbauer, J., Kanibolotska, L., Kanibolotskyy, A. L., Cameron, J. , Wallis, D. J., Martin, R. W. and Skabara, P. 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. (doi: 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: | Articles |
|---|---|
| Additional Information: | The authors thank EPSRC for funding through grants EP/ P02744X/2 and EP/R03480X/1. DJW acknowledges support from EPSRC fellowship (EP/N01202X/2). |
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Cameron, Dr Joseph and Kanibolotska, Dr Lyudmyla and Yang, Mr Hao and Skabara, Professor Peter and Kanibolotskyy, Dr Oleksandr |
| Authors: | Yang, H., Bruckbauer, J., Kanibolotska, L., Kanibolotskyy, A. L., Cameron, J., Wallis, D. J., Martin, R. W., and Skabara, P. J. |
| College/School: | College of Science and Engineering > School of Chemistry |
| Journal Name: | Journal of Materials Chemistry C: Materials for Optical and Electronic Devices |
| Publisher: | Royal Society of Chemistry |
| ISSN: | 2050-7526 |
| ISSN (Online): | 2050-7534 |
| Published Online: | 07 July 2023 |
| Copyright Holders: | Copyright © The Royal Society of Chemistry 2023 |
| First Published: | First published in Journal of Materials Chemistry C: Materials for Optical and Electronic Devices 11(29): 9984-9995 |
| Publisher Policy: | Reproduced under a Creative Commons licence |
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