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On the stability and reliability of Sr1-xBaxSi2O2N2:Eu2+ phosphors for white LED applicationsopen access
- Authors
- Cho, I. H.; Anoop, G.; Suh, D. W.; Lee, S. J.; Yoo, Jae Soo
- Issue Date
- Sep-2012
- Publisher
- OPTICAL SOC AMER
- Citation
- OPTICAL MATERIALS EXPRESS, v.2, no.9, pp 1292 - 1305
- Pages
- 14
- Journal Title
- OPTICAL MATERIALS EXPRESS
- Volume
- 2
- Number
- 9
- Start Page
- 1292
- End Page
- 1305
- ISSN
- 2159-3930
- Abstract
- 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 degrees 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 assynthesized 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 degrees 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. (c) 2012 Optical Society of America
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