Highly luminescent and stable white light-emitting diodes created by direct incorporation of Cd-free quantum dots in silicone resins using the thiol group

Cheolsang Yoon; Taewoo Kim; Min-Ho Shin; Young-Geon Song; Kyusoon Shin; Young-Joo Kim; Kangtaek Lee

doi:10.1039/C5TC00660K

Highly luminescent and stable white light-emitting diodes created by direct incorporation of Cd-free quantum dots in silicone resins using the thiol group†

Cheolsang Yoon,^a Taewoo Kim,^a Min-Ho Shin,^b Young-Geon Song,^a Kyusoon Shin,^c Young-Joo Kim*^b and Kangtaek Lee*^a

* Corresponding authors

^a Department of Chemical and Biomolecular Engineering, Yonsei University, Seoul 120-749, Republic of Korea
E-mail: ktlee@yonsei.ac.kr
Fax: +82 2 3126401
Tel: +82 2 21232760

^b Department of Mechanical Engineering, Yonsei University, Seoul 120-749, Republic of Korea
E-mail: yjkim40@yonsei.ac.kr
Fax: +82 2 3658460
Tel: +82 2 3658460

^c Advanced Institute of Research, Dongjin Semichem Co., Gyeonggido 463-400, Republic of Korea

Abstract

We have fabricated highly luminescent and stable white light-emitting diodes (WLEDs) by directly incorporating CIS/ZnS quantum dots (QDs) into silicone resins using the thiol group. First, QD-containing phenyl-vinyl-oligosiloxane base resins were prepared by an in situ condensation reaction of sol–gel precursors and QDs with and without 3-(mercaptopropyl)trimethoxysilane. Next, base resins were cured with the crosslinker resin through hydrosilylation to fabricate QD-containing phenyl hybrimer (QDPH) resins. We found that the QDPH resin containing a thiol group exhibited higher transmittance and quantum efficiency than that without the thiol group because of more uniform dispersion of QDs. Finally, fabrication of WLEDs with the thiol-containing resin exhibited enhancements over that without the thiol group with regard to photo and thermal stabilities, color conversion and luminous efficiencies, and color accuracy. These enhancements were attributed to the stronger interaction between QDs and the polymer network through the thiol-anchoring group.

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DOI: https://doi.org/10.1039/C5TC00660K
Article type: Paper
Submitted: 09 Mar 2015
Accepted: 19 May 2015
First published: 21 May 2015

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J. Mater. Chem. C, 2015,3, 6908-6915

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Highly luminescent and stable white light-emitting diodes created by direct incorporation of Cd-free quantum dots in silicone resins using the thiol group

C. Yoon, T. Kim, M. Shin, Y. Song, K. Shin, Y. Kim and K. Lee, J. Mater. Chem. C, 2015, 3, 6908 DOI: 10.1039/C5TC00660K

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Journal of Materials Chemistry C

Highly luminescent and stable white light-emitting diodes created by direct incorporation of Cd-free quantum dots in silicone resins using the thiol group†

Abstract

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Highly luminescent and stable white light-emitting diodes created by direct incorporation of Cd-free quantum dots in silicone resins using the thiol group

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