PREPARATION AND PHOTOLUMINESCENCE PROPERTIES OF YAG:Ce~(3+) SPHERICAL PHOSPHOR NANO-POWDERS BY THE MICROEMULSION METHOD

摘要

[中文文摘]采用反相微乳液法,以水/曲拉通X-100/正己醇/(环己烷+正己烷)为微乳体系,铝(Al)、钇(Y)和(Ce)的硝酸盐和氯化物作为起始反应物,氨水作为沉淀剂,成功制备了纳米球形铈掺杂钇铝石榴石(cerium doped yttrium alum inum garnet,YAG:Ce3+)荧光粉。实验表明:单相YAG可以在800℃合成,比固相反应法合成温度(1500℃)大幅度降低。用失重-差热分析仪、Fourier变换红外光谱仪、X射线衍射仪、透射电镜、荧光分光光度计等对粉体特性进行了表征。结果表明:粉体颗粒粒径约为50nm,粒度分布均匀,球形度好,分散性好,粉体的激发光谱为双峰结构,主激发波长为469nm,发射波长为532nm,适用于白光发光二极管。[英文文摘]Spherical nanopowder of cerium doped yttrium aluminum garnet (YAG:Ce3+) was prepared by the microemulsion method in a water/Triton X-100/hexanol/(cyclohexan+n-hexane) system. Aluminum (Al), yttrium (Y) and cerium (Ce) chloride and nitrates were used as starting materials, and ammonia was used as a precipitating agent. The YAG:Ce3+ nanopowder was prepared successfully. Experimental results indicate that the pure YAG phase is synthesized at the temperature of 800 ℃, which is lower than that by solid-state method(over 1500℃).The properties of the YAG:Ce3+ nanopowder was characterized by thermogravimetric-differential scanning calorimetry,Fourier transform infrared spectroscopy,X-ray diffractometer,transmission electron microscope,and photoluminescencespectroscopy.The results show that the YAG:Ce3+ nanopowder consist of fairly uniform,spherical particles.The particlesize is distributed uniformly at 50 nm.The excitation spectra show two peaks,with the major one at 469 nm.The emission spectrapeak is at 532 nm,indicating that phosphor is qualified for use in white light emitting diode.