| 光谱学与光谱分析 |
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| Study on Synthesis and Luminescence Mechanism of Novel Green Sr3Y(PO4)3∶Ce3+, Tb3+ Phosphors |
| DONG Guo-shuai, LIU Hai-bo, LUO Li*, WANG Yin-hai |
| School of Physics & Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, China |
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Abstract A novel green light-emitting phosphor Sr3Y(PO4)3Ce3+, Tb3+ was synthesized by the traditional high temperature solid state reaction method. Luminescence mechanism and crystal structure were investigated by X-Ray Diffraction (XRD) and photoluminescence spectra (PL). The XRD patterns demonstrate that the samples belong to the single phase of Sr3Y(PO4)3 in experimental doping concentrations range. Obviously,the excitation band of Sr3Y(PO4)3∶Tb3+ and the emission of Sr3Y(PO4)3∶Ce3+ have a significant spectral overlap in the wavelength range of 330～380 nm, which implies the great possibility of an efficient ET from Ce3+ to Tb3+. Under the 315 nm ultraviolet excitation, a blue emission（320～420 nm）from Ce3+ and a yellowish-green emission（480～500, 530～560 nm）from Tb3+ were obtained from Sr3Y(PO4)3∶Ce3+, Tb3+. When the Ce3+ concentration was 7%, the emission could be adjusted from blue to green region by tuning the Tb3+ doping concentrations from 1% to 50% through an energy transfer process. This text plot the schematic energy levels of Ce3+, and Tb3+ with electronic transitions and energy transfer processes in Sr3Y(PO4)3∶Ce3+, Tb3+, which disclose the electron motion processes of Sr3Y(PO4)3∶Ce3+, Tb3+. From the dependence of relative emission intensity of Ce3+, Tb3+ （5D4→7Fj）and ET efficiency from Ce3+ to Tb3+ on the concentrations of Tb3+, It can be seen that the relative intensity of Tb3+ and the values of ηET increase gradually with the increasing of Tb3+ as well as the relative intensity of Ce3+ decreases remarkably. The largest energy transfer efficiency reaches as high as 80% when the concentration of Tb3+ was 50%, demonstrating the efficient energy transfer from Ce3+ to Tb3+. The CIE chromaticity coordinate positions are plotted, as can be seen the emitting color of Ce3+ and Tb3+ singly doped Sr3Y(PO4)3∶Ce3+, Tb3+ phosphor are blue and yellowish green, respectively.The emitting color of samples Sr3Y(PO4)3∶Ce3+, Tb3+ changes from blue region to green region with the rising doping contents of Tb3+. Sr3Y(PO4)3∶Ce3+ and Tb3+ phosphor can be used as a green light-emitting phosphor in white LED devices and LCD backlights.
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Received: 2014-03-08
Accepted: 2014-07-14
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Corresponding Authors:
LUO Li
E-mail: luoli@gdut.edu.cn
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