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Proceedings Paper

Layered oxonitrido silicate (SiON) phosphors for high power LEDs
Author(s): Peter Schmidt; Andreas Tuecks; Helmut Bechtel; Detlef Wiechert; Regina Mueller-Mach; Gerd Mueller; Wolfgang Schnick
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Paper 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.

Paper Details

Date Published: 12 September 2008
PDF: 8 pages
Proc. SPIE 7058, Eighth International Conference on Solid State Lighting, 70580L (12 September 2008); doi: 10.1117/12.793000
Show Author Affiliations
Peter Schmidt, Philips Research Europe Aachen (Germany)
Andreas Tuecks, Philips Research Europe Aachen (Germany)
Helmut Bechtel, Philips Research Europe Aachen (Germany)
Detlef Wiechert, Philips Research Europe Aachen (Germany)
Regina Mueller-Mach, Philips Lumileds Lighting Co. (United States)
Gerd Mueller, Philips Lumileds Lighting Co. (United States)
Wolfgang Schnick, Munich Univ. (Germany)


Published in SPIE Proceedings Vol. 7058:
Eighth International Conference on Solid State Lighting
Ian T. Ferguson; Tsunemasa Taguchi; Ian E. Ashdown; Seong-Ju Park, Editor(s)

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