Tunable full color emission from single-phase LiSr_3.99?xDy_0.01(BO₃)₃:xEu³⁺ phosphors

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• 作者：Zhi-Wei Zhang^a ; ^{zhangzhiweia@163.com} ; Xin-Yuan Sun^b ; Dan-Dan Jia^a ; Shi-Tao Song^a ; Jian-Ping Zhang^a ; Shao-Fei Wang^a
• 关键词：Solid-state reaction ; LiSr3.99&minus ; xDy0.01(BO3)3 ; xEu3+ phosphors ; Photoluminescence ; White LEDs
• 刊名：Ceramics International
• 出版年：2013
• 出版时间：May, 2013
• 年：2013
• 卷：39
• 期：4
• 页码：3965-3970
• 全文大小：546 K

文摘

Tunable full color emissive LiSr_3.99?xDy_0.01(BO₃)₃:xEu³⁺ (0¡Üx¡Ü0.09) phosphors peaked at 481 nm (blue), 574 nm (yellow), 592 nm (orange), and 617 nm (red) were synthesized in air by high temperature solid-state reaction route. The as-synthesized phosphors were characterized by X-ray powder diffraction (XRD), photoluminescence excitation (PLE) and photoluminescence (PL) spectra. The PLE spectra in the range from 200 to 500 nm include an Eu-O charge transfer band (CTB) and several 4f-4f transition peaks of Dy³⁺ and Eu³⁺, indicating its potential application in white light emitting diodes (LEDs). The effect of Eu³⁺ concentration on the emission intensity of LiSr_3.99?xDy_0.01(BO₃)₃:xEu³⁺ phosphors was investigated in detail and the optical concentration is found to be x=0.005. The CIE chromaticity coordinates for LiSr_3.99?xDy_0.01(BO₃)₃:xEu³⁺ phosphors are simulated. With an increase in Eu³⁺ ion concentration, the chromaticity color coordinates can be tuned efficiently from the border of greenish white region to its equal-energy white light point, and eventually to red region. All the results imply that the studied LiSr_3.99?xDy_0.01(BO₃)₃:xEu³⁺ phosphors could be potentially used as white LEDs.