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Energy Express

Energy Express

  • Editor: Bernard Kippelen
  • Vol. 20, Iss. S1 — Jan. 2, 2012
  • pp: A69–A74

Brightly photoluminescent phosphor materials based on silicon quantum dots with oxide shell passivation

Chang-Ching Tu, Qifeng Zhang, Lih Y. Lin, and Guozhong Cao  »View Author Affiliations


Optics Express, Vol. 20, Issue S1, pp. A69-A74 (2012)
http://dx.doi.org/10.1364/OE.20.000A69


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Abstract

We demonstrate silicon-based phosphor materials which exhibit bright photoluminescence from near-infra-red to green. The colloidal composites which are composed of silicon quantum dots (SiQDs) attached on micro-size silicon particles are synthesized by electrochemical etching of silicon wafers and then dispersed in ethanol. Subsequently, isotropic etching by HF/HNO3 mixture controls the size so as the emission wavelength of SiQDs, and forms an oxide passivating shell. The phosphors can further react with alkoxysilanes to form a stable suspension in non-polar solvents for solution-processing. The resulting red-light-emitting SiQD-based phosphors in chloroform exhibit photoluminescence external quantum efficiency of 15.9%. Their thin films can be efficiently excited by InGaN light-emitting diodes and are stable in room condition.

© 2011 OSA

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

ToC Category:
Fluorescent and Luminescent Materials

History
Original Manuscript: October 6, 2011
Revised Manuscript: November 16, 2011
Manuscript Accepted: November 18, 2011
Published: December 8, 2011

Citation
Chang-Ching Tu, Qifeng Zhang, Lih Y. Lin, and Guozhong Cao, "Brightly photoluminescent phosphor materials based on silicon quantum dots with oxide shell passivation," Opt. Express 20, A69-A74 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-S1-A69


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