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Luminescence properties of SrSi2AlO2N3 doped with divalent rare-earth ions

Name: Luminescence properties of SrSi2AlO2N3 doped with divalent rare-earth ions
Keywords: 7. Clean energy

descriptionPublicationkeyboard_double_arrow_right Article 01 Nov 2009 Netherlands English Publisher:Elsevier BVJournal:Journal of Luminescence, volume 129, pages 1,341-1,346 (issn: 0022-2313,

Authors: Bachmann, V.M.; Meijerink, A.; Ronda, R.C.;

doi: 10.1016/j.jlumin.2009.06.023

Luminescence properties of SrSi2AlO2N3 doped with divalent rare-earth ions

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Abstract

The optical properties of SrSi2AlO2N3 doped with Eu2+ and Yb2+ are investigated towards their applicability in LEDs. The Eu2+-doped material shows emission in the green, peaking around 500 nm. The emission is ascribed to the 4f65d1–4f7 transition on Eu2+. In view of the too low quantum efficiency and the considerable thermal quenching of the emission at the operation temperature of high power LED (>1W/mm2) this phosphor is only suitable for application in low power LEDs. The Yb2+ emission shows an anomalously red-shifted emission compared to Eu2+, which is characterized by a larger FWHM, a larger Stokes shift and lower thermal quenching temperature. The emission is ascribed to self-trapped exciton emission. The Yb2+ activated phosphor is found to be unsuitable for the use in any phosphor-converted LEDs.

Country

Netherlands

Related Organizations

Utrecht University
Netherlands
Zhejiang Ocean University
China (People's Republic of)

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