Color-converting bilayered composite plate of quantum-dot-polymer for high-color rendering white light-emitting diode
- Authors
- Kim, Jong-Hoon; Song, Woo-Seuk; Yang, Heesun
- Issue Date
- 1-Aug-2013
- Publisher
- OPTICAL SOC AMER
- Citation
- OPTICS LETTERS, v.38, no.15, pp.2885 - 2888
- Journal Title
- OPTICS LETTERS
- Volume
- 38
- Number
- 15
- Start Page
- 2885
- End Page
- 2888
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/17076
- DOI
- 10.1364/OL.38.002885
- ISSN
- 0146-9592
- Abstract
- Highly bright CuInS2 quantum dots (QDs), whose emission is easily tuned in orange and greenish-yellow colors through manipulating the ZnS shelling procedure, are integrated with polymethyl methacrylate (PMMA) to obtain a free-standing composite plate of QD-polymer. The composite plate embedded with orange or greenish-yellow QDs is combined in a remote type with a blue light-emitting diode (LED). No color rendering index (CRI) value results when orange QDs are applied, whereas use of greenish-yellow QDs leads to a limited CRI of 72. A higher-color rendering QD-LED is demonstrated through a spectral extension by devising a unique bilayer-structured QD plate, where two types of QD are separately incorporated into each PMMA matrix, with a buffer layer of polymer blend inserted between them. The bilayered QD plate LED exhibits an improved CRI of 81, a high luminous efficacy of 71.2 lm/W at an input current of 20 mA, and exceptional high-stability luminescent characteristics against the variation of applied current. (C) 2013 Optical Society of America
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Collections - Graduate School > Materials Science and Engineering > 1. Journal Articles
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