Red, green and blue-violet emission coexistence in white-light-emitting Ca<sub>3sub>SiO<sub>4sub>Cl<sub>2sub>:Bi<sup>3+sup>, Li<sup>+sup>, Eu<sup>2+sup>, Eu<sup>3+sup> phosphor

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• 作者：Xiuzhen Xie ; Minzhen Zhong ; Xiangqi Li<sup> ; sup><sup>lxiangqi@fzu.edu.cnsup> ; Xiao Wu ; Haiting Wei
• 关键词：Bi3+ ; Eun+ ; Sol-gel process ; Ca3SiO4Cl2 ; Sensitization
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：1 February 2017
• 年：2017
• 卷：43
• 期：2
• 页码：1937-1942
• 全文大小：909 K
• 卷排序：43

文摘

A series of emission-tunable Ca3SiO4Cl2:Bi3+, Li+, Eun+(n =2, 3) (CSC:Bi3+, Li+, Eun+) phosphors have been synthesized via sol-gel method. The X-ray diffraction results indicate that the as-synthesized phosphors crystallize in a low temperature phase with the space group of P21/c. Energy transfer from Bi3+ to Eu3+/Eu2+ exists in CSC:Bi3+, Li+, Eun+ phosphors. Under the excitation of 327 or 365 nm, the Ca2.98&minus;ySiO4Cl2:0.01Bi3+, 0.01Li+, yEun+(y=0.0001&ndash;0.002) phosphors show an intense green emission band around 505 nm, while under the excitation of 264 nm, three emission bands centered around 396 nm (Bi3+), 505 nm (Eu2+) and 614 nm (Eu3+) are observed and tunable colors from blue-violet to green or white are achieved in these phosphors by varying the content of Eu. White-light emission with the color coordinate (0.312, 0.328) is obtained in Ca2.978SiO4Cl2:0.01Bi3+, 0.01Li+, 0.002Eun+(n =2, 3). Based on these results, the as-prepared CSC:Bi3+, Li+, Eu2+, Eu3+ phosphors can act as color-tunable and single-phase white emission phosphors for potential applications in UV-excited white LEDs.