光谱学与光谱分析, 2015, 35 (8): 2189, 网络出版: 2015-08-25  

新型Sr3Y(PO4)3:Ce3+,Tb3+绿光荧光粉的制备与发光机理的研究

Study on Synthesis and Luminescence Mechanism of Novel Green Sr3Y(PO4)3:Ce3+,Tb3+ Phosphors
作者单位
广东工业大学物理与光电工程学院, 广东 广州 510006
摘要
采用传统的高温固相法合成了一种新型的绿色荧光粉Sr3Y(PO4)3∶Ce3+,Tb3+,利用X射线衍射(XRD)和荧光光谱(PL)对该材料的晶体结构和光学性能进行表征.结果分析表明,制得样品的XRD图谱不含Sr3Y(PO4)3以外的杂峰,稀土掺杂并未改变基质的晶体结构,得到的样品为纯相的磷酸钇锶.从本文实验中明显观察到Sr3Y(PO4)3∶Tb3+的激发光谱和Ce3+的发射光谱在320~390 nm有重叠,表明在Sr3Y(PO4)3基质中可存在从Ce3+到Tb3+的能量传递.在紫外光(315 nm)激发下该荧光粉发射出了Ce3+的蓝光(320~420 nm)和Tb3+的黄绿光(480~500 nm)和(530~560 nm),当Ce3+的浓度为7%,Tb3+的浓度由1%增大到50%时,通过Ce3+的4f→5d电子跃迁将能量传递到Tb3+,然后发生5D4→7Fj电子跃迁,该荧光粉发射光谱可由蓝光逐渐调节为黄绿光.本文绘制了Ce3+,Tb3+的能级和Sr3Y(PO4)3∶Ce3+,Tb3+荧光粉中的能量转移过程示意图,并详细阐述了由Ce3+到Tb3+的能量传递过程.通过对比Ce3+和Tb3+的发光强度以及由Ce3+到Tb3+能量转移效率的相对变化,可以得出,随着掺入的Tb3+浓度不断增加,Tb3+的发射强度(5D4→7Fj)和能量转移效率(Ce3+到Tb3+)也在增大,而Ce3+的发射强度却有了明显的下降.当Tb3+的浓度为50% 时能量转移效率可高达80%.通过CIE色度图也可以看出,当Tb3+浓度不断增大,样品的色坐标从图中的蓝色区域移动到绿色区域.所以在紫外光激发下,Ce3+和Tb3+共掺Sr3Y(PO4)3可作为一种绿光荧光粉应用在白光LED或LCD背光源上.
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.

董国帅, 刘海波, 罗莉, 王银海. 新型Sr3Y(PO4)3:Ce3+,Tb3+绿光荧光粉的制备与发光机理的研究[J]. 光谱学与光谱分析, 2015, 35(8): 2189. DONG Guo-shuai, LIU Hai-bo, LUO Li, WANG Yin-hai. Study on Synthesis and Luminescence Mechanism of Novel Green Sr3Y(PO4)3:Ce3+,Tb3+ Phosphors[J]. Spectroscopy and Spectral Analysis, 2015, 35(8): 2189.

关于本站 Cookie 的使用提示

中国光学期刊网使用基于 cookie 的技术来更好地为您提供各项服务,点击此处了解我们的隐私策略。 如您需继续使用本网站,请您授权我们使用本地 cookie 来保存部分信息。
全站搜索
您最值得信赖的光电行业旗舰网络服务平台!