喷雾热解法制备红色发光粉LiEu(SiO_2)_(1/6)W_2O_8的研究  

Red Phosphor LiEu(SiO_2)_(1/6)W_2O_8 Particles Prepared by Spray Pyrolysis

作　　者：井艳军[1] 王海波[2] 黄如喜[2] 朱宪忠[2] 沈静飞[1] 

机构地区：[1]南京工业大学 材料科学与工程学院,江苏南京210009 [2]南京工业大学 电光源材料研究所,江苏南京210015

出　　处：《发光学报》2007年第5期715-719,共5页Chinese Journal of Luminescence

基　　金：国家"十五"攻关计划资助项目(2003BA316A01-030-05)

摘　　要：采用喷雾热解法制备红色荧光粉LiEu(SiO_2)_(1/6)W_2O_8。研究了反应温度、前驱体溶液浓度、载气流速对实验结果的影响。通过扫描电镜、X射线衍射、激发和发射光谱对所制样品进行了研究,发现样品颗粒呈实心类球形、结晶度好、表面光滑、发光强度较高、粒径平均1.5μm左右且分布较窄。该类荧光粉激发主峰位于396nm,发射主峰位于615nm。LiEu(SiO_2)_(1/6)W_2O_8发光的色坐标为:x=0.667 9,y=0.3310,与NTSC的红色标准基本一致,该荧光粉色纯度非常高,适用于制造紫光芯片激发的白光LED。用喷雾热解法制备红色荧光粉LiEu(SiO_2)_(1/6)W_2O_8的研究尚未见报道。Red phosphor LiEu （SiO2 ）1/6 W2O8 particles were prepared by ultrasonic spray pyrolysis. The effects of firing temperature, concentration of precursor solution and flow rate of carrier gas on phosphor relative emission intensity were studied. The morphology and luminescence characteristics of the particles were in- vestigated by scanning electron microscope （SEM）, X-ray diffraction, excitation spectra and emission spectra respecti-vely. The particles were like spherical shape, around 1.5 μm in diameter and with narrow size distribution. Aggregation between particles was not observed. Spray pyrolysis makes Eu^3＋ well distributed in the crystal lattice as the luminescent centers. The phosphor LiEu（ SiOz ）l/6W2O8 particles prepared by spray pyrolysis have higher emission intensity than that by solid state reaction. The main excitation peak of the particles is near 396 nm. The main peak of the emission spectra under 396 nm light excitation is a transition ^5D0→^7F2 of Eu^3＋ at 615 nm, while other emission peaks are transitions ^5D0→^7Fl , 5D0→^7F3 and ^5D0→^7F4 of Eu^3＋ at 592 nm, 655 nm, 702 nm respectively. The intensity of other emission peaks is weak, which is advantageous to obtain the good CIE chromaticity coordinates. The CIE chromaticity coordinates are calculated to be x = 0. 667 9, y =0.331 0 for the emission of LiEu（ SiO2 ）1/6W2O8. The particles may be used for white-LED excitated by ultraviolet chip. Compared with traditional solid state reaction, spray pyrolysis have many advantages. For ex- ample, pure phase particles are achieved , flux and pyrolysis can be produced cus of research in recent never been reported. are not needed and phosphor prepared by spray continuously etc. Luminescent materials prepared by spray pyrolysis have become foyears. Yet red phosphor LiEuSi1/6W2O8 particles prepared by spray pyrolysis have never been reported.

关 键 词：喷雾热解 发光粉 LiEu(SiO2)1/6 W2O8 白光LED 

分 类 号：O482.31[理学—固体物理]