CAJ | 학술논문

采用传统的高温固相法合成了一种新型的绿色荧光粉Sr3 Y（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Sr3 Y（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T b3＋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T b3＋的黄绿光（480～500 nm ）和（530～560 nm ），当Ce3＋的浓度为7％，T b3＋的浓度由1％增大到50％时，通过Ce3＋的4 f→5 d电子跃迁将能量传递到T b3＋，然后发生5 D4→7 Fj 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C e3＋到T b3＋的能量传递过程。通过对比C e3＋和T b3＋的发光强度以及由C e3＋到T b3＋能量转移效率的相对变化，可以得出，随着掺入的 T b3＋浓度不断增加， T b3＋的发射强度（5 D4→7 Fj ）和能量转移效率（Ce3＋到T b3＋）也在增大，而Ce3＋的发射强度却有了明显的下降。当T b3＋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。
채용전통적고온고상법합성료일충신형적록색형광분Sr3 Y（PO4）3∶Ce3＋，Tb3＋，이용X사선연사（XRD ）화형광광보（PL ）대해재료적정체결구화광학성능진행표정。결과분석표명，제득양품적XRD도보불함Sr3 Y（PO4）3이외적잡봉，희토참잡병미개변기질적정체결구，득도적양품위순상적린산을송。종본문실험중명현관찰도Sr3Y（PO4）3∶ Tb3＋적격발광보화Ce3＋적발사광보재320～390 nm유중첩，표명재Sr3Y （PO4）3기질중가존재종Ce3＋도T b3＋적능량전체。재자외광（315 nm ）격발하해형광분발사출료Ce3＋적람광（320～420 nm ）화T b3＋적황록광（480～500 nm ）화（530～560 nm ），당Ce3＋적농도위7％，T b3＋적농도유1％증대도50％시，통과Ce3＋적4 f→5 d전자약천장능량전체도T b3＋，연후발생5 D4→7 Fj 전자약천，해형광분발사광보가유람광축점조절위황록광。본문회제료Ce3＋，Tb3＋적능급화Sr3Y（PO4）3∶Ce3＋，Tb3＋형광분중적능량전이과정시의도，병상세천술료유C e3＋도T b3＋적능량전체과정。통과대비C e3＋화T b3＋적발광강도이급유C e3＋도T b3＋능량전이효솔적상대변화，가이득출，수착참입적 T b3＋농도불단증가， T b3＋적발사강도（5 D4→7 Fj ）화능량전이효솔（Ce3＋도T b3＋）야재증대，이Ce3＋적발사강도각유료명현적하강。당T b3＋적농도위50％시능량전이효솔가고체80％。통과CIE색도도야가이간출，당Tb3＋농도불단증대，양품적색좌표종도중적람색구역이동도록색구역。소이재자외광격발하，Ce3＋화 Tb3＋공참Sr3Y（PO4）3가작위일충록광형광분응용재백광LED혹LCD배광원상。
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 Sr3 Y(PO4 )3 ∶Tb3+ and the emission of Sr3 Y(PO4 )3∶Ce3+ have a significant spectral overlap in the wavelength range of 330~380 nm ,which implies the great possibility of an effi‐cient 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 Sr3 Y(PO4 )3 ∶Ce3+ ,Tb3+ .When the Ce3+ concentra‐tion 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 Sr3 Y (PO4 )3 ∶Ce3+ ,Tb3+ ,which disclose the electron motion processes of Sr3 Y (PO4 )3 ∶Ce3+ ,Tb3+ .From the dependence of relative emission intensity of Ce3+ ,Tb3+ (5 D4 → 7 Fj )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 Sr3 Y(PO4 )3 ∶Ce3+ ,Tb3+ chan‐ges 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 .