Effects of crystal field on photoluminescence properties of Ca₂Al₂SiO₇:Eu²⁺ phosphors

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• 作者：Penghui YANG^a ; Xue YU^a ; ^b ; Hongling YU^a ; Tingming JIANG^a ; Dacheng ZHOU^a ; ^b ; Jianbei QIU^a ; ^b ; ^{qiu@kmust.edu.cn}
• 关键词：luminescence ; Ca2Al2SiO7 ; Eu2+ ; crystal field splitting ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2012
• 出版时间：December, 2012
• 年：2012
• 卷：30
• 期：12
• 页码：1208-1212
• 全文大小：816 K

文摘

A series of single-phased Ca₂Al₂SiO₇:Eu²⁺ phosphors were synthesized by the solid-state reaction. Their structure and photoluminescence properties were investigated by the X-ray powder diffraction (XRD) and excitation and emission spectra in detail. The emission spectra of Ca₂Al₂SiO₇:Eu²⁺ phosphors consisted of blue and green band located at 419 and 542 nm, respectively. The relative intensities of the blue and green emission changed with Eu²⁺ concentration and were sensitive to the excitation wavelength. The unique photoluminescence property originated from the 4f⁷¡ú4f⁶5d transition of Eu²⁺ at different energy levels, on which the effect of the crystal field strength was considered to be tailed by adjusting the host composition.