Materials design and properties of nitride phosphors for LEDs

Peter Schmidt; Andreas Tuecks; Joerg Meyer; Helmut Bechtel; Detlef Wiechert; Regina Mueller-Mach; Gerd Mueller; Wolfgang Schnick

doi:10.1117/12.734227

14 September 2007 Materials design and properties of nitride phosphors for LEDs

Peter Schmidt, Andreas Tuecks, Joerg Meyer, Helmut Bechtel, Detlef Wiechert, Regina Mueller-Mach, Gerd Mueller, Wolfgang Schnick

Author Affiliations +

Proceedings Volume 6669, Seventh International Conference on Solid State Lighting; 66690P (2007) https://doi.org/10.1117/12.734227
Event: Optical Engineering + Applications, 2007, San Diego, California, United States

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 Ba_2-xSr_xSi₅N₈: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_-xAl_xO_xN_8-x:Eu. (Al,O) incorporation leads to anisotropic changes of lattice constants and a red shift and broadening of the Eu emission.

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Peter Schmidt, Andreas Tuecks, Joerg Meyer, Helmut Bechtel, Detlef Wiechert, Regina Mueller-Mach, Gerd Mueller, and Wolfgang Schnick "Materials design and properties of nitride phosphors for LEDs", Proc. SPIE 6669, Seventh International Conference on Solid State Lighting, 66690P (14 September 2007); https://doi.org/10.1117/12.734227

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