Thermal quenching and luminescence lifetime of saturated green Sr_1?xEu_xGa₂S₄ phosphors

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• 作者：Jonas J. Joos ; Katrien W. Meert ; Anthony B. Parmentier ; Dirk Poelman ; Philippe F. Smet
• 关键词：Conversion phosphor ; LED ; Displays ; Europium ; Thermal quenching ; Thiogallate
• 刊名：Optical Materials
• 出版年：2012
• 出版时间：September, 2012
• 年：2012
• 卷：34
• 期：11
• 页码：1902-1907
• 全文大小：680 K

文摘

Due to the lack of efficient green emitting solid state light sources, conversion phosphors emitting saturated green emission are highly interesting, both for display and signalling applications. In this work, we study the luminescence properties of Sr_1?xEu_xGa₂S₄ phosphors over a wide dopant concentration range (x = 0.01-0.3), as function of temperature. The phosphors show a saturated green emission over the entire studied range, with a typical peak wavelength around 536 nm and a FWHM of 50 nm. The internal quantum efficiency is 71 % for x = 0.04. For this concentration, the emission intensity at 400 K is still 90 % of the intensity at room temperature. By measuring both decay and thermal quenching profiles as a function of europium concentration, we were able to explain the emission properties on the basis of the local environment of the europium ions in the lattice.