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Energy Express

Energy Express

  • Editor: Christian Seassal
  • Vol. 22, Iss. S2 — Mar. 10, 2014
  • pp: A276–A281

Red-emitting silicon quantum dot phosphors in warm white LEDs with excellent color rendering

Chang-Ching Tu, Ji H. Hoo, Karl F. Böhringer, Lih Y. Lin, and Guozhong Cao  »View Author Affiliations


Optics Express, Vol. 22, Issue S2, pp. A276-A281 (2014)
http://dx.doi.org/10.1364/OE.22.00A276


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Abstract

We demonstrate red-emitting silicon quantum dot (SiQD) phosphors as a low-cost and environment-friendly alternative to rare-earth element phosphors or CdSe quantum dots. After surface passivation, the SiQD-phosphors achieve high photoluminescence quantum yield = 51% with 365-nm excitation. The phosphors also have a peak photoluminescence wavelength at 630 nm and a full-width-at-half-maximum of 145 nm. The relatively broadband red emission is ideal for forming the basis of a warm white spectrum. With 365-nm or 405-nm LED pumping and the addition of green- and/or blue-emitting rare-earth element phosphors, warm white LEDs with color rendering index ~95 have been achieved.

© 2014 Optical Society of America

OCIS Codes
(160.2540) Materials : Fluorescent and luminescent materials
(250.5230) Optoelectronics : Photoluminescence
(160.4236) Materials : Nanomaterials

ToC Category:
Light-Emitting Diodes

History
Original Manuscript: December 9, 2013
Revised Manuscript: January 17, 2014
Manuscript Accepted: January 18, 2014
Published: January 28, 2014

Citation
Chang-Ching Tu, Ji H. Hoo, Karl F. Böhringer, Lih Y. Lin, and Guozhong Cao, "Red-emitting silicon quantum dot phosphors in warm white LEDs with excellent color rendering," Opt. Express 22, A276-A281 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-S2-A276


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