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Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 5 — Mar. 1, 2014
  • pp: 1208–1211

Quantum-dot-based white lighting planar source through downconversion by blue electroluminescence

Ki-Heon Lee, Jong-Hoon Kim, Ho Seong Jang, Young Rag Do, and Heesun Yang  »View Author Affiliations


Optics Letters, Vol. 39, Issue 5, pp. 1208-1211 (2014)
http://dx.doi.org/10.1364/OL.39.001208


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Abstract

We report the unprecedented fabrication of a planar white lighting quantum dot light-emitting diode (QD-LED) through integrating a CdZnS QD-based blue electroluminescence (EL) device with a free-standing polymethyl methacrylate (PMMA) composite film embedded with orange-emitting Cu–In–S (CIS) green-greenish yellow-emitting Cu–In–Ga–S (CIGS) QDs. The hybrid device successfully generates bicolored white emission that comprises blue EL and downconverted QD photoluminescence. The hybrid QD-LEDs loaded with the composite film embedded with one type of QDs exhibit a limited white spectral coverage, consequently producing low values (<65) in color rendering index (CRI). Thus, the QD-PMMA film consisting of a blend of green CIGS and orange CIS QD downconverters is applied for obtaining a higher-CRI white light through the spectral extension, resulting in a much improved CRI of 75–77. Various EL performances of the hybrid planar white device versus the reference blue QD-LED are also characterized in details.

© 2014 Optical Society of America

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

ToC Category:
Optoelectronics

History
Original Manuscript: November 26, 2013
Manuscript Accepted: January 19, 2014
Published: February 21, 2014

Citation
Ki-Heon Lee, Jong-Hoon Kim, Ho Seong Jang, Young Rag Do, and Heesun Yang, "Quantum-dot-based white lighting planar source through downconversion by blue electroluminescence," Opt. Lett. 39, 1208-1211 (2014)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-39-5-1208


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