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Energy Express

Energy Express

  • Editor: Bernard Kippelen
  • Vol. 18, Iss. S4 — Nov. 8, 2010
  • pp: A575–A583

Enhanced photoluminescence from mixed-valence Eu-doped nanocrystalline silicate glass ceramics

Guojun Gao, Ning Da, Sindy Reibstein, and Lothar Wondraczek  »View Author Affiliations


Optics Express, Vol. 18, Issue S4, pp. A575-A583 (2010)
http://dx.doi.org/10.1364/OE.18.00A575


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Abstract

Intense photoluminescence was observed from mixed-valence Eu-doped nanocrystalline BaAl2Si2O8/LaBO3 glass ceramics. For preparation in air, the ratio between Eu3+ and Eu2+ luminescence depends on synthesis temperature. XRD, TEM and IR absorption spectra were employed to characterize the crystallization process and structural properties of the precursor glass and corresponding glass ceramics. When annealed at 950 °C, the material exhibited photoluminescence more than ten times stronger than was found in its glassy state. Spectroscopic data indicate that during such a heat treatment, even in air, a significant part of the Eu3+ ions is reduced to Eu2+. Lifetime of the 5D0 state of Eu3+ increases with increasing heat treatment temperature. Eu3+ species are largely incorporated on La3+ sites in LaBO3 crystallites whereas Eu2+ locates on Ba2+ sites in the hexacelsian phase. A mechanism for the internal reduction of Eu3+ to Eu2+ is proposed. Spectroscopic properties of the material suggest application in additive luminescent light generation.

© 2010 OSA

OCIS Codes
(140.3380) Lasers and laser optics : Laser materials
(140.4480) Lasers and laser optics : Optical amplifiers
(160.2540) Materials : Fluorescent and luminescent materials
(160.4670) Materials : Optical materials

ToC Category:
Fluorescent Luminescent Materials

History
Original Manuscript: August 11, 2010
Revised Manuscript: October 6, 2010
Manuscript Accepted: October 8, 2010
Published: October 15, 2010

Citation
Guojun Gao, Ning Da, Sindy Reibstein, and Lothar Wondraczek, "Enhanced photoluminescence from 
mixed-valence Eu-doped nanocrystalline 
silicate glass ceramics," Opt. Express 18, A575-A583 (2010)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-S4-A575


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