Cold white light generation through the simultaneous emission from Ce³⁺, Dy³⁺ and Mn²⁺ in 90Al₂O₃路2CeCl₃路3DyCl₃路5MnCl₂ thin film

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• 作者：W. Gonzá ; lez^a ; E. Á ; lvarez^b ; R. Mart&iacute ; nez-Mart&iacute ; nez^c ; E. Yescas-Mendoza^c ; I. Camarillo^a ; U. Caldi&ntilde ; o^a ; ^{cald@xanum.uam.mx}
• 关键词：Ce3+ ; Dy3+ ; Mn2+ ; Thin film ; Energy transfer ; White light
• 刊名：Journal of Luminescence
• 出版年：2012
• 期刊代码：54_00222313
• 类别：ch
• 出版时间：August, 2012
• 卷：132
• 期：8
• 页码：2130-2134
• 文件大小：574 K

摘要

The photoluminescence of a CeCl₃, DyCl₃ and MnCl₂ doped aluminum oxide film deposited by ultrasonic spray pyrolysis was characterized by excitation, emission and decay time spectroscopy. A nonradiative energy transfer from Ce³⁺ to Dy³⁺ and Mn²⁺ is observed upon UV excitation at 278 nm (peak emission wavelength of AlGaN-based LEDs). Such energy transfer leads to a simultaneous emission of these ions in the blue, green, yellow and red regions, resulting in white light emission with CIE1931 chromaticity coordinates, x=0.34 and y=0.23, which correspond to cold white light with a color temperature of 4900 K.