Luminescence properties of Ca₃Si₂O₇: Dy³⁺ phosphor for white light-emitting diodes

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• 作者：Xinghua Zhang ; ^{xinghua146@yahoo.com.cn} ; Zunming Lu ; Fanbin Meng ; Long Hu ; Xuewen Xu ; Jing Lin ; Chengchun Tang ; ^{tangcc@hebut.edu.cn}
• 关键词：Phosphors ; Luminescence ; White LEDs ; Ca3Si2O7 ; Dy3+
• 刊名：Materials Letters
• 出版年：2012
• 期刊代码：59_0167577x
• 类别：ms
• 出版时间：15 July, 2012
• 卷：79
• 期：Complete
• 页码：292-295
• 文件大小：609 K

摘要

A new white Ca_{3 鈭?#xA0;x}Si₂O₇: xDy³⁺ (x = 0.03, 0.05, 0.07, 0.10) phosphor with various Dy³⁺ concentrations was prepared and its photoluminescent properties were investigated. The XRD results show that the Dy³⁺ substitution of Ca²⁺ does not change the structure of Ca₃Si₂O₇ host for x 鈮?#xA0;0.10. The SEM image displays that phosphors aggregate obviously, and the shape of the phosphor particle is irregular. The EDX results reveal that the phosphors consist of Ca, Si, O and Dy elements. Luminescence spectra excited by 350 nm consist of two characteristic blue and yellow bands, which correspond to ⁴F_9/2鈫?sup>6H_15/2 and ⁴F_9/2鈫?sup>6H_13/2 transitions of Dy³⁺, respectively. The yellow-to-blue emission intensity ratio under excitation of 350 nm increases with the elevated Dy³⁺ concentrations, and the evaluated color coordinates of the investigated samples fall in the white light region. The energy transfer style between Dy³⁺ ions is dipole-dipole interaction for higher concentration Dy³⁺ doped Ca₃Si₂O₇ phosphor. The quantum efficiency for x = 0.05 sample excited by 365 nm is 15.16%.