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Optics Letters

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  • Editor: Alan E. Willner
  • Vol. 38, Iss. 15 — Aug. 1, 2013
  • pp: 2885–2888

Color-converting bilayered composite plate of quantum-dot–polymer for high-color rendering white light-emitting diode

Jong-Hoon Kim, Woo-Seuk Song, and Heesun Yang  »View Author Affiliations


Optics Letters, Vol. 38, Issue 15, pp. 2885-2888 (2013)
http://dx.doi.org/10.1364/OL.38.002885


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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 71.2lm/W at an input current of 20 mA, and exceptional high-stability luminescent characteristics against the variation of applied current.

© 2013 Optical Society of America

OCIS Codes
(230.3670) Optical devices : Light-emitting diodes
(250.5230) Optoelectronics : Photoluminescence
(160.4236) Materials : Nanomaterials

ToC Category:
Optical Devices

History
Original Manuscript: June 7, 2013
Revised Manuscript: July 5, 2013
Manuscript Accepted: July 5, 2013
Published: July 30, 2013

Citation
Jong-Hoon Kim, Woo-Seuk Song, and Heesun Yang, "Color-converting bilayered composite plate of quantum-dot–polymer for high-color rendering white light-emitting diode," Opt. Lett. 38, 2885-2888 (2013)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-38-15-2885


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