Cool to warm white light emission from hybrid inorganic/organic light-emitting diodes
Taylor-Shaw, Elaine and Angioni, Enrico and Findlay, Neil J. and Breig, Benjamin and Inigo, Anto R. and Bruckbauer, Jochen and Wallis, David J. and Skabara, Peter J. and Martin, Robert W. (2016) Cool to warm white light emission from hybrid inorganic/organic light-emitting diodes. Journal of Materials Chemistry. C, 4 (48). pp. 11499-11507. ISSN 2050-7526 (https://doi.org/10.1039/C6TC03585J)
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Abstract
The synthesis and characterisation of two novel organic down-converting molecules is disclosed, together with their performance as functional colour-converters in combination with inorganic blue light-emitting diodes (LEDs). Each molecule contains two fluorene-triphenylamine arms, connected to either a benzothiadiazole or bisbenzothiadiazole core. These molecules have been selected on the basis that they are free from absorption bands in the green region of the visible spectrum to maximise their performance and offer improvements compared with previous BODIPY-containing analogues. The inorganic InGaN/GaN LED emits at 444 nm, overlying the absorption of each of the organic molecules. The combination of the blue (inorganic) and yellow (organic) emission is shown to produce reasonable quality, white light-emitting hybrid devices for both down-converter molecules. Cool to warm white light is achieved for both molecules by increasing the concentration. An optimum colour rendering index (CRI) value of 66 is obtained for the mono-benzothiadiazole molecule. Also a high blue-to-white efficacy (defined as white luminous flux (lm)/blue radiant flux (W)) of 368 lm/W is achieved, superseding the current phosphor converters of 200-300 lm/W. A comparison of these down-converting molecules to the older generation BODIPY-containing molecules is also provided.
ORCID iDs
Taylor-Shaw, Elaine ORCID: https://orcid.org/0000-0002-8262-5762, Angioni, Enrico ORCID: https://orcid.org/0000-0003-2413-4452, Findlay, Neil J. ORCID: https://orcid.org/0000-0002-1417-3311, Breig, Benjamin ORCID: https://orcid.org/0000-0001-6290-2673, Inigo, Anto R., Bruckbauer, Jochen ORCID: https://orcid.org/0000-0001-9236-9320, Wallis, David J., Skabara, Peter J. and Martin, Robert W. ORCID: https://orcid.org/0000-0002-6119-764X;-
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Item type: Article ID code: 58749 Dates: DateEvent28 November 2016Published28 November 2016Published Online18 November 2016AcceptedSubjects: Science > Chemistry Department: Faculty of Science > Pure and Applied Chemistry
Faculty of Science > Physics
Technology and Innovation Centre > Photonics
Technology and Innovation Centre > BionanotechnologyDepositing user: Pure Administrator Date deposited: 18 Nov 2016 16:54 Last modified: 13 Sep 2024 00:31 Related URLs: URI: https://strathprints.strath.ac.uk/id/eprint/58749