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Proceedings Paper

Materials design and properties of nitride phosphors for LEDs
Author(s): Peter Schmidt; Andreas Tuecks; Joerg Meyer; Helmut Bechtel; Detlef Wiechert; Regina Mueller-Mach; Gerd Mueller; Wolfgang Schnick
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Paper Abstract

We have studied structure-property relations of Eu(II) doped nitridosilicates M2Si5N8 and MSi7N10 (M = Sr, Ba). For both systems that are described as being efficient LED phosphors, we show that a detailed examination of the local activator environment in combination with net positive charge calculations for Eu with the EHTB-MO method allows a qualitative prediction of the luminescence properties of nitridosilicate LED phosphors. The non-linear shift of the amber to red emission of solid solutions Ba2-xSrxSi5N8:Eu is explained by a non-statistical distribution of Eu over the available lattice sites. The Stokes shift differences between the two available Eu sites are significantly larger for Ba2Si5N8:Eu than for Sr2Si5N8:Eu. In contradiction to literature data, BaSi7N10:Eu shows emission in the cyan spectral region and a large Stokes shift, in accordance with the host lattice geometry and the electronic structure calculations that were carried out. SiAlON formation as an additional design tool to tune nitridosilicate phosphor emission properties is demonstrated for Sr2Si5-xAlxOxN8-x:Eu. (Al,O) incorporation leads to anisotropic changes of lattice constants and a red shift and broadening of the Eu emission.

Paper Details

Date Published: 14 September 2007
PDF: 9 pages
Proc. SPIE 6669, Seventh International Conference on Solid State Lighting, 66690P (14 September 2007); doi: 10.1117/12.734227
Show Author Affiliations
Peter Schmidt, Philips Research Europe Aachen (Germany)
Andreas Tuecks, Philips Research Europe Aachen (Germany)
Joerg Meyer, 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. 6669:
Seventh International Conference on Solid State Lighting
Ian T. Ferguson; Nadarajah Narendran; Tsunemasa Taguchi; Ian E. Ashdown, Editor(s)

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