کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5402913 | 1392745 | 2009 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Luminescence properties of SrSi2AlO2N3 doped with divalent rare-earth ions
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
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چکیده انگلیسی
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 500Â 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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 129, Issue 11, November 2009, Pages 1341-1346
Journal: Journal of Luminescence - Volume 129, Issue 11, November 2009, Pages 1341-1346
نویسندگان
Volker Bachmann, Andries Meijerink, Cees Ronda,