利用碳热还原法制备了LaSi_3N_5∶Ce~(3+)蓝色荧光粉,重点研究了原料中掺C量和退火对样品纯度及发光性能的影响。通过X射线衍射仪和荧光; 光谱仪分别表征样品的晶体结构和发光性能。研究结果表明: 1; 600℃时能够合成主相为LaSi_3N_5∶Ce~(3+)的荧光粉。在360nm紫外光激发下样品可获得波段范围在380~; 600nm的单峰宽带发射谱,归结于Ce~(3+)的5d-4f的能级跃迁。当nC/n_(La)=4/1时样品发光强度达到最大,并且光谱出现先红移后; 蓝移的现象。经过退火的样品的发光强度与退火前相比提高了60%~345%。将热处理后的nC/n_(La)=4/1的样品与商用YAG混合涂覆在UV芯; 片上(lambda_(em)=365nm)封装成WLED,证实了 LaSi_3N_5∶Ce~(3+)在白光LED领域潜在的应用价值。LaSi_3N_5∶Ce~(3+)blue phosphors were prepared by carbothermal reduction; method.The influence of C content and heatdealing on purity and; luminescence of samples were investigated.The phosphors were; characterized by X-ray diffraction(XRD) and fluorescence; spectrophotometer(PL).XRD patterns revealed that LaSi_3N_5∶Ce~(3+)could; be combusted at 1 600℃.There was a single-peak broadwide emission; spectrum between 380~600nm due to the electron transfer of Ce~(3+)from; 5d-4 fexcited by 360nm.The luminescence intensity reached the maximum; value atnC/n_(La)=4/1 followed by a continuous decline with a red shift; and then a blue shift appeared in the spectrum.The luminescence; intensity of samples improved 60%~345%after heat-dealing. WLED were; fabricated by applying a blend mixture of the sample and commercial YAG; on a UV chip(lambdablend m),which indicated that LaSi_3N_5∶Ce~(3+)blue; phosphor had a potential application value in WLED.国家重点研发计划项
