Luminescent properties of Ce3+/Tb3+ co-doped glass ceramics containing YPO4 nanocrystals for W-LEDs
来源期刊:Journal of Rare Earths2016年第5期
论文作者:张志雄 张约品 冯治刚 王成 夏海平 张新民
文章页码:464 - 469
摘 要:Ce3+/Tb3+ co-doped transparent glass ceramics containing YPO4 nanocrystals were prepared using high temperature melting method,and their structural and luminous properties were investigated.XRD analysis and TEM images confirmed the existence of YPO4 nanocrystals in glass ceramics.The transmission spectra proved that the glass ceramics specimens still maintained a high transparency.Then the excitation and emission spectra of the Ce3+ and Tb3+ single-doped and co-doped glass and glass ceramics were discussed,which proved that the glass ceramics had better luminescent properties.Under the near ultraviolet(331 nm)excitation,the broadband emission located at 385 nm was observed which was ascribed to 5d→2F5/2 and 2F7/2 transition of Ce3+ ions.Several characteristic sharp peaks centered at 489,543,578 and 620 nm originated from the 5D4 to 7FJ(J=6,5,4,3)of Tb3+ ions.The decay time of Tb3+ ions at 543 nm and the relevant energy levels of Ce3+ ions and Tb3+ ions illustrated the transfer process from Ce3+ ions to Tb3+ ions.The best CIE chromaticity coordinate of the glass ceramics specimen was calculated as(x=0.3201,y=0.3749),which was close to the NTSC standard values for white(x=0.333,y=0.333).All the results suggested that the YPO4-based Ce3+/Tb3+ co-doped glass ceramics could act as potential luminescent materials for white light-emitting diodes.
张志雄,张约品,冯治刚,王成,夏海平,张新民
Key Laboratory of Photo-electronic Materials,Ningbo University
摘 要:Ce3+/Tb3+ co-doped transparent glass ceramics containing YPO4 nanocrystals were prepared using high temperature melting method,and their structural and luminous properties were investigated.XRD analysis and TEM images confirmed the existence of YPO4 nanocrystals in glass ceramics.The transmission spectra proved that the glass ceramics specimens still maintained a high transparency.Then the excitation and emission spectra of the Ce3+ and Tb3+ single-doped and co-doped glass and glass ceramics were discussed,which proved that the glass ceramics had better luminescent properties.Under the near ultraviolet(331 nm)excitation,the broadband emission located at 385 nm was observed which was ascribed to 5d→2F5/2 and 2F7/2 transition of Ce3+ ions.Several characteristic sharp peaks centered at 489,543,578 and 620 nm originated from the 5D4 to 7FJ(J=6,5,4,3)of Tb3+ ions.The decay time of Tb3+ ions at 543 nm and the relevant energy levels of Ce3+ ions and Tb3+ ions illustrated the transfer process from Ce3+ ions to Tb3+ ions.The best CIE chromaticity coordinate of the glass ceramics specimen was calculated as(x=0.3201,y=0.3749),which was close to the NTSC standard values for white(x=0.333,y=0.333).All the results suggested that the YPO4-based Ce3+/Tb3+ co-doped glass ceramics could act as potential luminescent materials for white light-emitting diodes.
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