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Language: English

Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received November 27, 2014
Accepted January 6, 2015

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Enhancing performance of quantum dot-based light emitting diodes by using poly(methyl methacrylate)@quantum dot hybrid particles

Hyun Chang Kim Cheolsang Yoon Young-Geon Song Young-Joo Kim¹ Kangtaek Lee^†

Department of Chemical and Biomolecular Engineering, Yonsei University, Seoul 120-749, Korea ¹Department of Mechanical Engineering, Yonsei University, Seoul 120-749, Korea

Korean Journal of Chemical Engineering, March 2015, 32(3), 563-566(4), 10.1007/s11814-015-0008-z

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Abstract

Quantum dots (QDs) are attractive alternatives for organic phosphors in light emitting diodes (LEDs) due to their high quantum yield and photostability. Various methods have been developed for fabrication of LEDs using QDs, yet the reduction in quantum yield during film formation still limits their practical applications. We prepared hybrid particles by coating spherical poly(methyl methacrylate) (PMMA) particles with the CdSe/ZnS QDs, and dispersed them in the PMMA matrix. The PMMA particles were derived from the same material as the PMMA matrix, so that they could not only act as a spacer but also match the refractive index between the polymer particles and matrix. The PMMA@QD hybrid particles exhibited higher quantum yield in both suspension and film states than the pristine QDs. In addition, the dispersion state of QDs in PMMA matrix was significantly improved by using the hybrid particles. Finally, it was demonstrated that the QD-based LED device containing the PMMA@QD hybrid particles exhibited_x000D_ enhancement in both color conversion and luminous efficiencies.

Keywords

Quantum Dot Light Emitting Diode Poly(methyl methacrylate) Hybrid Particles Dispersion

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