Synthesis and luminescence properties of novel Y₂Si₄N₆C:Sm³⁺ carbonitride phosphor

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• 作者：Jiayue Sun ; ^{jiayue_sun@126.com} ; Junhui Zeng ; Yining Sun ; Jicheng Zhu ; Haiyan Du
• 关键词：Luminescence ; Red phosphors ; W-LEDs ; Optical materials
• 刊名：Ceramics International
• 出版年：2013
• 出版时间：March, 2013
• 年：2013
• 卷：39
• 期：2
• 页码：1097-1102
• 全文大小：523 K

文摘

Novel Y₂Si₄N₆C:Sm³⁺ phosphors for white light-emitting diodes (w-LEDs) were prepared by a carbothermal reduction and nitridation method. X-ray diffraction (XRD) and photoluminescence spectra were utilized to characterize the structure and luminescence properties of the as-synthesized phosphors. The emission spectrum obtained by excitation into 291 nm contains exclusively the characteristic emission of Sm³⁺ at 568, 607 and 654 nm which correspond to the transitions from ⁴G_5/2 to ⁶H_5/2, ⁶H_7/2, and ⁶H_9/2 of Sm³⁺, respectively. The strongest one is located at 607 nm due to ⁴G_5/2-⁶H_7/2 transition of Sm³⁺. It was found that concentration quenching occurred as a result of dipole-dipole interaction according to Dexter's theory. The temperature dependence of photoluminescence properties was investigated from 25 to 300 ¡ãC and the prepared Y₂Si₄N₆C:Sm³⁺ phosphors showed superior thermal quenching properties.