高效红色荧光粉Li1–xAlSiO4+x:x Eu^3+的制备与发光性能

Preparation and luminescence properties of highly efficient red phosphor Li1–xAlSiO4+x:x Eu^3+

以碳酸锂、氧化铝、二氧化硅、Eu2O3为原料,采用传统高温固相法在1150℃制备系列Eu3+掺杂LiAlSiO4红色荧光粉Li1–xAlSiO4+x:xEu3+(x=0.05~0.18)。利用XRD、SEM和光致发光光谱分别对其晶体结构,粉体形貌和发光性能进行了表征。考察了Eu3+掺杂量对所制红色荧光粉发光强度、色温、色调的影响。结果表明:Eu3+掺杂摩尔分数低于15.0%时,样品为单一基质;样品可以被近紫外350~420 nm波段高效激发,最强激发发射峰位于394 nm。发射光谱呈现出Eu3+的特征峰,谱带峰值在593、616 nm处,分别对应于Eu3+的5D0→7F1、5D0→7F2特征跃迁。最强发射对应Eu3+掺杂摩尔分数为12.0%,浓度猝灭主要是因为四极-四极(q-q)相互作用,CIE坐标为(0.6464,0.3526),可应用于近紫外芯片激发LED用红色荧光粉。

Lithium carbonate,aluminium oxide,silicon dioxide,europium(III)oxide were used as raw materials to prepare a series of Eu3+ion-doped LiAlSiO4 red phosphor Li1–xAlSiO4+x:x Eu3+(x=0.05~0.18)by a conventional high-temperature solid-phase method at 1150℃.The crystal structure,particle morphology and luminescence properties of Li1–xAlSiO4+x:x Eu3+were characterized by XRD,SEM and photoluminescence spectrum.The influence of amount of Eu3+doping on the luminescence intensity,color temperature and hue of the red phosphors was investigated.The results indicated that the sample was single host when the Eu3+doping molar fraction was below 15.0%.The sample could be excited by the near-ultraviolet band of 350~420 nm,and the strongest excitation peak was located at 394 nm.The emission spectrum showed characteristic peaks of Eu3+,at 593 nm and 616 nm,corresponding to 5D0→7F1,5D0→7F2 transitions,respectively.The optimal doping molar fraction of Eu3+corresponding to the strongest emission of sample was 12.0%.The occurrence of concentration quenching was mainly due to the quadrupole-quadrupole(q-q)interaction.The CIE coordinate of this sample is(0.6464,0.3526),thus,it can be a candidate of red phosphor for NUV excited LEDs.