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Hybrid photonic crystal light-emitting diode renders 123% color conversion effective quantum yield

Hybrid photonic crystal light-emitting diode renders 123% color conversion effective quantum yield
Hybrid photonic crystal light-emitting diode renders 123% color conversion effective quantum yield
Colloidal quantum dots (QDs) have emerged as promising color conversion light emitters for solid-state lighting applications [Nat. Photonics 7, 13 (2012) [CrossRef] due to their emission tunability and near-unity photoluminescence quantum yields. In the current commercial LEDs, QDs are dispersed into an encapsulation layer in a far-field architecture, where the majority of the light emitted by the LED remains trapped within the epitaxy due to total internal reflection, drastically reducing the out-coupling efficiency. In this paper, we demonstrate a photonic quasi-crystal hybrid LED geometry that allows QD emitters to be placed in close proximity to the multiple quantum wells (MQWs) of the active area. This architecture greatly improves the coupling between MQWs and QDs, simultaneously allowing for a non-radiative resonant energy transfer between the MQWs and the QDs and near-field radiative coupling of trapped (guided) modes in the LED to the emitters. In this configuration, we demonstrate record-breaking effective quantum yields reaching 123% for single-color conversion LEDs and 110% for white light-emitting devices.
503-509
Krishnan, C.
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Brossard, M.
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Lee, K.-Y.
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Huang, J.-K.
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Lin, C.-H.
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Kuo, H.-C.
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Charlton, M.D.B.
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Lagoudakis, P.G.
ea50c228-f006-4edf-8459-60015d961bbf
Krishnan, C.
0d41ebc9-118a-4f89-889e-8ad28a69237e
Brossard, M.
0e36d99c-5900-4386-960b-d2aa88df7322
Lee, K.-Y.
0070a494-a197-4108-b65d-abc3897cac36
Huang, J.-K.
8bc626dc-922d-4c9b-a088-400b691387d8
Lin, C.-H.
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Kuo, H.-C.
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Charlton, M.D.B.
fcf86ab0-8f34-411a-b576-4f684e51e274
Lagoudakis, P.G.
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Krishnan, C., Brossard, M., Lee, K.-Y., Huang, J.-K., Lin, C.-H., Kuo, H.-C., Charlton, M.D.B. and Lagoudakis, P.G. (2016) Hybrid photonic crystal light-emitting diode renders 123% color conversion effective quantum yield. Optica, 3 (5), 503-509. (doi:10.1364/OPTICA.3.000503).

Record type: Article

Abstract

Colloidal quantum dots (QDs) have emerged as promising color conversion light emitters for solid-state lighting applications [Nat. Photonics 7, 13 (2012) [CrossRef] due to their emission tunability and near-unity photoluminescence quantum yields. In the current commercial LEDs, QDs are dispersed into an encapsulation layer in a far-field architecture, where the majority of the light emitted by the LED remains trapped within the epitaxy due to total internal reflection, drastically reducing the out-coupling efficiency. In this paper, we demonstrate a photonic quasi-crystal hybrid LED geometry that allows QD emitters to be placed in close proximity to the multiple quantum wells (MQWs) of the active area. This architecture greatly improves the coupling between MQWs and QDs, simultaneously allowing for a non-radiative resonant energy transfer between the MQWs and the QDs and near-field radiative coupling of trapped (guided) modes in the LED to the emitters. In this configuration, we demonstrate record-breaking effective quantum yields reaching 123% for single-color conversion LEDs and 110% for white light-emitting devices.

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Accepted/In Press date: 20 February 2016
e-pub ahead of print date: 10 May 2016
Published date: 20 May 2016
Organisations: Quantum, Light & Matter Group

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Local EPrints ID: 393167
URI: http://eprints.soton.ac.uk/id/eprint/393167
PURE UUID: 12fcccf3-6c12-4292-baea-75a9e6a92b62

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Date deposited: 22 Apr 2016 08:59
Last modified: 17 Dec 2019 06:51

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