白光LED用Ba_(6)Gd_(2)Ti_(4)O_(17):Sm^(3+)红色荧光粉的制备及发光性能研究

Study on synthesis and luminescent properties of Ba_(6)Gd_(2)Ti_(4)O_(17):Sm^(3+) red phosphor for white LED

采用传统的高温固相法制备一种新型的红色荧光粉Ba_(6)Gd_(2)Ti_(4)O_(17):Sm^(3+),并通过X射线衍射(X-ray diffraction,XRD)、扫描电子显微镜(scanning electron microscope,SEM)、荧光(photoluminescence,PL)光谱及色坐标表征系列样品的物相、形貌和发光性能.PL光谱表明该荧光粉可以被近紫外光有效激发,在407 nm近紫外光激发下,发射光谱由四个发射峰组成,最强发射峰位于616 nm处,归结为Sm^(3+)的^(4)G_(5/2)→^(6)H_(7/2)跃迁.随着Sm^(3+)掺杂量的增加,荧光粉的发光强度先增大后减小,最佳掺杂比例(物质的量分数)为3%.系列掺杂比例荧光粉的色坐标基本不变,均位于红光区.研究结果表明,该荧光粉是一种具有应用前景的新型白光发光二极管(light-emitting diode,LED)用红色荧光粉.

A novel red phosphor Ba_(6)Gd_(2)Ti_(4)O_(17):Sm^(3+)was synthesized by a traditional high temperature solid-state reaction.The phase,morphology and luminescent properties of the prepared samples were characterized by X-ray diffraction(XRD),scanning electron microscope(SEM),photoluminescence(PL)spectroscopy and color coordinate.The PL spectroscopy indicated that the phosphor could be effectively excited by near-ultraviolet light.Under 407 nm excitation near-ultraviolet light,the emission spectrum consisted of four emission peaks.The strongest emission peak at 616 nm was attributed to^(4)G_(5/2)→^(6)H_(7/2)transition of Sm^(3+).With the increase of Sm^(3+)doping amount,the luminescent intensity of the phosphor firstly increased and then decreased.The optimum doping ratio(mole percentage)of Sm^(3+)ions in Ba_(6)Gd_(2)Ti_(4)O_(17):Sm^(3+)was 3%.The color coordinates of the series doping ratio samples located in the red region were basically unchanged.The results show that the Ba_(6)Gd_(2)Ti_(4)O_(17):Sm^(3+)phosphor exhibits a great potential to be used as red fluorescent material for application in based white light-emitting diode(LED).