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

doi:10.1039/C9QM00771G

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 journal › Article › peer-review

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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 low concentrations within this resin. A maximum luminous efficacy of 87 lm W ^-1 was demonstrated using a 1.0 mg ml ^-1 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 language	English
Pages (from-to)	1006-1012
Number of pages	7
Journal	Materials Chemistry Frontiers
Volume	4
Issue number	3
Early online date	6 Feb 2020
DOIs	https://doi.org/10.1039/C9QM00771G
Publication status	Published - 1 Mar 2020

Keywords

down-converter
LEDs
TPA-BDI
hybrid LED technology

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10.1039/C9QM00771GLicence: CC BY 4.0

Wiles-etal-MCF2020-A-poly(urethane)-encapsulated benzo-diimidazole-organic-down-converterFinal published version, 2.61 MBLicence: CC BY 4.0

Cite this

@article{6e72194069834b8fb36b9271494b3519,

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

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 low concentrations within this resin. A maximum luminous efficacy of 87 lm W -1 was demonstrated using a 1.0 mg ml -1 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. ",

keywords = "down-converter, LEDs, TPA-BDI, hybrid LED technology",

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

year = "2020",

month = mar,

day = "1",

doi = "10.1039/C9QM00771G",

language = "English",

volume = "4",

pages = "1006--1012",

journal = "Materials Chemistry Frontiers ",

publisher = "Royal Society of Chemistry",

number = "3",

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TY - JOUR

T1 - A poly(urethane)-encapsulated benzo[2,3-d:6,7-d']diimidazole organic down-converter for green hybrid LEDs

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

PY - 2020/3/1

Y1 - 2020/3/1

N2 - 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 low concentrations within this resin. A maximum luminous efficacy of 87 lm W -1 was demonstrated using a 1.0 mg ml -1 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.

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 low concentrations within this resin. A maximum luminous efficacy of 87 lm W -1 was demonstrated using a 1.0 mg ml -1 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.

KW - down-converter

KW - LEDs

KW - TPA-BDI

KW - hybrid LED technology

UR - https://pubs.rsc.org/en/journals/journalissues/qm

U2 - 10.1039/C9QM00771G

DO - 10.1039/C9QM00771G

M3 - Article

VL - 4

SP - 1006

EP - 1012

JO - Materials Chemistry Frontiers

JF - Materials Chemistry Frontiers

IS - 3

ER -

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

Abstract

Keywords

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'Hetero-print': A holistic approach to transfer-printing for heterogeneous integration in manufacturing

Light-controlled manufacturing of semiconductor structures: a platform for next generation processing of photonic devices

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

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Projects

'Hetero-print': A holistic approach to transfer-printing for heterogeneous integration in manufacturing

Light-controlled manufacturing of semiconductor structures: a platform for next generation processing of photonic devices

Cite this