Luminescent properties of Eu³⁺-doped glass ceramics containing BaGdF₅ nanocrystals under NUV-excitation for W-LEDs

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• 作者：Weihuan Zhang ; Shaoye Ouyang ; Zhixiong Zhang ; Yuepin Zhang ; ^{zhangyuepin@nbu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Haiping Xia
• 关键词：D. Glass ceramics ; BaGdF5 nanocrystals ; Luminescent properties ; Chromaticity coordinates
• 刊名：Ceramics International
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：41
• 期：10
• 页码：14035-14040
• 全文大小：1519 K

文摘

Eu³⁺ doped transparent glass ceramics containing BaGdF₅ nanocrystals were successfully fabricated by melt-quenching technique, and their structural and luminous properties were investigated. X-ray diffraction (XRD) and transmission electron microscopy(TEM) proved the existence of BaGdF₅ nanocrystals in the transparent glass ceramics, which plays an important role in improvement the luminescent properties. The excitation spectra showed that the glass and glass ceramics could be effectively excited by near ultraviolet (NUV) light. Intense red emission located at 611 nm and longer lifetimes observed in glass ceramics are attributed to the incorporation of Eu³⁺ ions into BaGdF₅ nanocrystals with lower phonon energy. The CIE chromaticity coordinates of glass ceramics (GC610) were calculated as (x=0.625, y=0.374), which was close to the NTSC standard values for red (x=0.67, y=0.33). The results suggest that the glass ceramics may be used as potential red phosphors under near ultraviolet (NUV) light excitation for white light-emitting diodes (W-LEDs).