A poly(urethane)-encapsulated benzo[2,3-d:6,7-d']diimidazole organic down-converter for green hybrid LEDs

Alan A. Wiles, Jochen Bruckbauer, Nabeel Mohammed, Michele Cariello, Joseph Cameron, Neil J. Findlay, Elaine Taylor-Shaw, David J. Wallis, Robert W. Martin, Peter J. Skabara, Graeme Cooke

Research output: Contribution to journalArticle

Abstract

The development of organic down-converting materials continues to attract attention in hybrid LED technology by obviating the need for non-sustainable rare-earth elements. In this work, a benzodiimidazole-based system (TPA-BDI) has been employed as a down-converting layer in a hybrid organic-inorganic LED device. A commercially available poly(urethane)-based resin is used as the encapsulating material, providing a dilute layer of TPA-BDI that is deposited on top of the GaN-based LED. Crucially, the solution-state emissive performance is generally maintained when encapsulated at dilute concentrations within this resin. A maximum luminous efficacy of 87 lm/W was demonstrated using a 1.0 mg/ml concentration of TPA-BDI in the resin. The suitability of using organic down-converters to produce green light from hybrid devices was demonstrated by the excellent repeatability of the device characteristics across a series of encapsulated LEDs.
Original languageEnglish
Pages (from-to)1-9
Number of pages9
JournalMaterials Chemistry Frontiers
Early online date6 Feb 2020
DOIs
Publication statusE-pub ahead of print - 6 Feb 2020

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Urethane
Light emitting diodes
Resins
Methyl Green
Rare earth elements

Keywords

  • down-converter
  • LEDs
  • TPA-BDI
  • hybrid LED technology

Cite this

Wiles, Alan A. ; Bruckbauer, Jochen ; Mohammed, Nabeel ; Cariello, Michele ; Cameron, Joseph ; Findlay, Neil J. ; Taylor-Shaw, Elaine ; Wallis, David J. ; Martin, Robert W. ; Skabara, Peter J. ; Cooke, Graeme. / A poly(urethane)-encapsulated benzo[2,3-d:6,7-d']diimidazole organic down-converter for green hybrid LEDs. In: Materials Chemistry Frontiers . 2020 ; pp. 1-9.
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abstract = "The development of organic down-converting materials continues to attract attention in hybrid LED technology by obviating the need for non-sustainable rare-earth elements. In this work, a benzodiimidazole-based system (TPA-BDI) has been employed as a down-converting layer in a hybrid organic-inorganic LED device. A commercially available poly(urethane)-based resin is used as the encapsulating material, providing a dilute layer of TPA-BDI that is deposited on top of the GaN-based LED. Crucially, the solution-state emissive performance is generally maintained when encapsulated at dilute concentrations within this resin. A maximum luminous efficacy of 87 lm/W was demonstrated using a 1.0 mg/ml concentration of TPA-BDI in the resin. The suitability of using organic down-converters to produce green light from hybrid devices was demonstrated by the excellent repeatability of the device characteristics across a series of encapsulated LEDs.",
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Wiles, AA, Bruckbauer, J, Mohammed, N, Cariello, M, Cameron, J, Findlay, NJ, Taylor-Shaw, E, Wallis, DJ, Martin, RW, Skabara, PJ & Cooke, G 2020, 'A poly(urethane)-encapsulated benzo[2,3-d:6,7-d']diimidazole organic down-converter for green hybrid LEDs', Materials Chemistry Frontiers , pp. 1-9. https://doi.org/10.1039/C9QM00771G

A poly(urethane)-encapsulated benzo[2,3-d:6,7-d']diimidazole organic down-converter for green hybrid LEDs. / Wiles, Alan A.; Bruckbauer, Jochen; Mohammed, Nabeel; Cariello, Michele; Cameron, Joseph; Findlay, Neil J.; Taylor-Shaw, Elaine; Wallis, David J.; Martin, Robert W.; Skabara, Peter J.; Cooke, Graeme.

In: Materials Chemistry Frontiers , 06.02.2020, p. 1-9.

Research output: Contribution to journalArticle

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AU - Wiles, Alan A.

AU - Bruckbauer, Jochen

AU - Mohammed, Nabeel

AU - Cariello, Michele

AU - Cameron, Joseph

AU - Findlay, Neil J.

AU - Taylor-Shaw, Elaine

AU - Wallis, David J.

AU - Martin, Robert W.

AU - Skabara, Peter J.

AU - Cooke, Graeme

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AB - The development of organic down-converting materials continues to attract attention in hybrid LED technology by obviating the need for non-sustainable rare-earth elements. In this work, a benzodiimidazole-based system (TPA-BDI) has been employed as a down-converting layer in a hybrid organic-inorganic LED device. A commercially available poly(urethane)-based resin is used as the encapsulating material, providing a dilute layer of TPA-BDI that is deposited on top of the GaN-based LED. Crucially, the solution-state emissive performance is generally maintained when encapsulated at dilute concentrations within this resin. A maximum luminous efficacy of 87 lm/W was demonstrated using a 1.0 mg/ml concentration of TPA-BDI in the resin. The suitability of using organic down-converters to produce green light from hybrid devices was demonstrated by the excellent repeatability of the device characteristics across a series of encapsulated LEDs.

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