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Optical Materials Express

Optical Materials Express

  • Editor: David J. Hagan
  • Vol. 4, Iss. 2 — Feb. 1, 2014
  • pp: 213–219

Effect of UV irradiation on photoluminescence of carbon dots

Dezhi Tan, Shifeng Zhou, Yasuhiko Shimotsuma, Kiyotaka Miura, and Jianrong Qiu  »View Author Affiliations

Optical Materials Express, Vol. 4, Issue 2, pp. 213-219 (2014)

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Effect of ultraviolet light irradiation on the photoluminescence of carbon dots (CDs) is investigated. After the ultraviolet light irradiation, CDs exhibit red shifted and enhanced green emission, and significantly enhanced emission in the wavelength region from green-yellow to red. Carbonyl groups increase remarkably originated from photochemical oxidation, resulting in more defect energy trapping (DET) states, higher electron density, and stronger n(OH)→π*(CO) interactions. Consequently, a decrease in band gap and more contribution from the DET states related radiative recombination result in an enhancement of green emission and beyond, while ultraviolet emission is reduced and blue shifted due to the decrease of sp2 carbons.

© 2014 Optical Society of America

OCIS Codes
(160.2540) Materials : Fluorescent and luminescent materials
(240.6670) Optics at surfaces : Surface photochemistry
(260.3800) Physical optics : Luminescence
(260.5130) Physical optics : Photochemistry
(160.4236) Materials : Nanomaterials

ToC Category:
Fluorescent and Luminescent Materials

Original Manuscript: August 29, 2013
Revised Manuscript: October 14, 2013
Manuscript Accepted: October 17, 2013
Published: January 7, 2014

Dezhi Tan, Shifeng Zhou, Yasuhiko Shimotsuma, Kiyotaka Miura, and Jianrong Qiu, "Effect of UV irradiation on photoluminescence of carbon dots," Opt. Mater. Express 4, 213-219 (2014)

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