共沉淀法制备不球磨稀土磷酸盐绿色荧光粉研究  

Synthesis of Non-grinding Green-emitting Rare Earth Phosphate Phosphors by Coprecipitation

作　　者：刘南生[1] 孙曰圣[2] 彭宏博[2] 熊瑛[2] 张小林[2] 邹建国[2] 

机构地区：[1]南昌大学物理系,江西南昌330047 [2]南昌大学化工系,江西南昌330029

出　　处：《发光学报》2001年第4期412-416,共5页Chinese Journal of Luminescence

摘　　要：报道了共沉淀法制备ＬａＰＯ４：Ｃｅ，Ｔｂ绿色荧光粉的工艺。运用热分析仪，Ｘ射线衍射仪，光谱仪和激光粒度仪对其差热、结构、发射光谱和粒度进行了研究。结果表明：该法制得的ＬａＰＯ４：Ｃｅ，Ｔｂ绿色荧光粉灼烧温度低，无杂相，颗粒适中，不需球磨可直接用于涂管。LaPO4 :Ce, Tb was an important green luminescence material used in tricolour fluorescent lamp. It could replace the (Ce, Tb) MgAl11 O19 phosphor used in the China. The main synthesis method of the phosphor was the high temperature solid state method. The phosphor had a great particle size. It must be milled when it was used. This way not only increased production cost, but also influenced on luminescence intensity. (La, Ca, Tb)PO4 was prepared by coprecipitation of a rare earth nitrate solution with diammonium hydrogen phosphate as precipitation agent while adding little surfactant and controlling the conditions of the reaction. The green-emitting phosphor LaPO4 : Ce, Tb used in fluorescent lamps was prepared by it as the precursors. The most suitable technological conditions were obtained. RE(NO3)3 and (NH4)2HPO4 were si multaneously added at the same rate in the experiment. The concentrations of RE(NO3)3 and (NH4)2HPO4 should be the same in order to ensure a uniform precipitation. The suitable concentration of the feed liquid is 0. 2mol/L. The suitable reaction temperature was controlled to be 30~40℃ in the experiment. The crystal size of (La, Ce, Tb) PO4 in precipitation and its property of filtre were improved by adding a little surface- tant. The precipitation and mother liquid were aged for a period with a pH value of 7 usually. The suitable aging time is 1 -2h, and the suitable aging temperature was determined to be 50-60℃. The most suitable calcination temperature of the phosphor is 900℃ and calcination time is 1h under the carbon-reducing atmo- sphere. The partical size of the LaPO4 : Ce, Tb fluorescent powder prepared in present experiment was mea- sured by a laser granularity meter: D50 = 4. 34μm. The particle is fine and the granularity displays a narrow normal distribution which can meet the needs of fluorescent lamp fabrication. The X-ray diffraction spec- trum clearly shows that the fluorescent powder has a phosphatic monoclinic monazete structure without any impurity phase and t

关 键 词：共沉淀 不球磨 磷酸镧 荧光粉 制备 绿色发光材料 LaPO4:Ce Tb 铈掺杂 铽 

分 类 号：TN104.3[电子电信—物理电子学]