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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 24 — Nov. 21, 2011
  • pp: 24314–24319

An intense charge transfer broadband sensitized near-infrared emitting CaLaGa3S6O:Yb3+ phosphor suitable for solar spectral convertor

Gongguo Zhang, Chunmeng Liu, Jing Wang, Xiaojun Kuang, and Qiang Su  »View Author Affiliations

Optics Express, Vol. 19, Issue 24, pp. 24314-24319 (2011)

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A near-infrared (NIR) phosphor, CaLaGa3S6O:Yb3+, is developed as a promising solar spectral convertor for Si solar cells. The structure, photoluminescence excitation and emission spectra, concentration effect are investigated. The results show that CaLaGa3S6O:Yb3+ has an efficient broad absorption band dominating around the 345 nm ascribing to the charge transfer state (CTS) of Yb3+-S2- and exhibits an intense NIR emission of Yb3+ between 920 and 1150 nm, perfectly matching the maximum spectral response of Si solar cells. The NIR emission intensity of CaLaGa3S6O:Yb3+ is 12 times as intense as that of a NIR quantum cutting phosphor Ca2BO3Cl:Ce3+, Tb3+, Yb3+ (CBC) upon 4f-5d excitation of Ce3+. These results demonstrate that the allowed CTS of Yb3+-S2- with high absorption cross-section can be an efficient and direct sensitizer harvesting UV-blue photons and greatly enhancing the NIR emission of Yb3+ ion.

© 2011 OSA

OCIS Codes
(160.2540) Materials : Fluorescent and luminescent materials
(300.6340) Spectroscopy : Spectroscopy, infrared

ToC Category:
Solar Energy

Original Manuscript: July 21, 2011
Revised Manuscript: September 10, 2011
Manuscript Accepted: October 19, 2011
Published: November 14, 2011

Gongguo Zhang, Chunmeng Liu, Jing Wang, Xiaojun Kuang, and Qiang Su, "An intense charge transfer broadband sensitized near-infrared emitting CaLaGa3S6O:Yb3+phosphor suitable for solar spectral convertor," Opt. Express 19, 24314-24319 (2011)

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