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Proceedings Article

Layered oxonitrido silicate (SiON) phosphors for high power LEDs

[+] Author Affiliations
Peter Schmidt, Andreas Tuecks, Helmut Bechtel, Detlef Wiechert

Philips Research Europe Aachen (Germany)

Regina Mueller-Mach, Gerd Mueller

Philips Lumileds Lighting Co. (USA)

Wolfgang Schnick

Munich Univ. (Germany)

Proc. SPIE 7058, Eighth International Conference on Solid State Lighting, 70580L (September 12, 2008); doi:10.1117/12.793000
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From Conference Volume 7058

  • Eighth International Conference on Solid State Lighting
  • Ian T. Ferguson; Tsunemasa Taguchi; Ian E. Ashdown; Seong-Ju Park
  • San Diego, California, USA | August 10, 2008

abstract

In our contribution we discuss structure-luminescence property relations of MSi2O2N2:Eu (M = Ba, Sr, Ca) phosphors to explain the differences in excitability, emission band position and width. The differences in Eu2+ site coordination, number and size of sites lead to a shift of emission from M = Ba over M = Sr to M = Ca from cyan to yellow accompanied by an increased Stokes shift. Because of its favourable emission properties with a peak at ~ 538 nm SrSi2O2N2:Eu was selected and optimized as down-conversion material for green pcLEDs. pcLEDs built with LUXEONR thin-film flip chip (TFFC) LEDs show stable color points under a wide range of drive conditions (I ≤ 1A, T ≤ 150°C) as a consequence of the very high conversion efficiency of optimized SrSi2O2N2:Eu color converters. Although cutbacks in color purity have to be made because of the broad band phosphor emission spectrum, efficacies of the discussed green pcLEDs are significantly higher compared to direct green emitting InGaN LEDs.

© (2008) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Peter Schmidt ; Andreas Tuecks ; Helmut Bechtel ; Detlef Wiechert ; Regina Mueller-Mach, et al.
"Layered oxonitrido silicate (SiON) phosphors for high power LEDs", Proc. SPIE 7058, Eighth International Conference on Solid State Lighting, 70580L (September 12, 2008); doi:10.1117/12.793000; http://dx.doi.org/10.1117/12.793000


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