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Optical Materials Express

Optical Materials Express

  • Editor: David J. Hagan
  • Vol. 2, Iss. 9 — Sep. 1, 2012
  • pp: 1292–1305

On the stability and reliability of Sr1-xBaxSi2O2N2:Eu2+ phosphors for white LED applications

I. H. Cho, G. Anoop, D. W. Suh, S. J. Lee, and J. S. Yoo  »View Author Affiliations

Optical Materials Express, Vol. 2, Issue 9, pp. 1292-1305 (2012)

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Sr1-xBaxSi2O2N2:Eu2+ phosphors were synthesized using high temperature solid state reactions and the reliability of the as-synthesized phosphors for White LED applications was investigated. The oxidation resistance of the phosphors was investigated by baking the phosphors at various temperatures in air for 2 hours and also at 85 °C, 85% relative humidity for 150 hours. The photo stability of the phosphor was studied by illuminating the phosphor using a high power laser diode (450 nm) at various laser fluxes. Phosphor converted LEDs were fabricated using the as-synthesized Sr1-xBaxSi2O2N2:Eu2+ (x = 0 and 0.40) phosphors. The long term stability of the fabricated LEDs was tested by keeping the LEDs at 85 °C and 85% relative humidity for 800 hrs. Even though phosphors show high thermal and chemical stability, the electroluminescent (EL) intensity of the fabricated LEDs drops by 15% after 800 hrs of operation. The degradation of EL intensity of the device might be the result of thermally assisted photo-ionization of Eu2+ ions in the phosphor.

© 2012 OSA

OCIS Codes
(160.2540) Materials : Fluorescent and luminescent materials
(160.5690) Materials : Rare-earth-doped materials
(250.5230) Optoelectronics : Photoluminescence

ToC Category:
Fluorescent and Luminescent Materials

Original Manuscript: August 7, 2012
Revised Manuscript: August 16, 2012
Manuscript Accepted: August 16, 2012
Published: August 24, 2012

I. H. Cho, G. Anoop, D. W. Suh, S. J. Lee, and J. S. Yoo, "On the stability and reliability of Sr1-xBaxSi2O2N2:Eu2+ phosphors for white LED applications," Opt. Mater. Express 2, 1292-1305 (2012)

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