ZnS原料及(Zn,Cd)S:Cu ACEL粉的粒度与亮度关系的探讨

用沉降粒度仪测定,并用对数正态分布参数表示法计算了十几种不同ZnS原料及对应的(Zn,Cd)S:Cu ACEL粉的粒度分布,发现ZnS原料对数正态分布的分散程度lnσ及中心粒径d50对(Zn,Cd)S:Cu粉的粒径分布均有影响,其中前者的影响尤为明显.本文还研究了(Zn,Cd)S:Cu的粒度分布对亮度的影响,发现850℃左右在硫气氛中烧得的(Zn,Cd)S:Cu粉,其沉降平均粒径d为10-30μ时,粒径较大的,用交流电致发光盒测得的亮度大体上较高;沉降d为20-30μ(扫描电镜测d约3-6μ)时,其ACEL亮度性能较好.

THE DISCUSSION ON THE RELATIONSHIP BETWEEN THE LUMINANCE OF THE ACEL PHOSPHOR (Zn,Cd)S:Cu AND THE PARTICLE SIZES OF RAW ZnS AND (Zn,Cd)S:Cu

Two problems of particle size have been studied in this paper.1. The relationship between the particle size of raw materials ZnS and that of corresponding ACEL phosphors (Zn,Cd)S:Cu.2. The relationship between the particle size of (Zn,Cd)S:Cu and its ACEL luminance.Twelve types of ZnS raw materials with different particle sizes were used in the experiments. The phosphors were prepared at about 850℃ in sulfur atmosphere. The particle size distribution of raw materials and corresponding ACEL phosphors (Zn,Cd)S:Cu were measured by means of sedimentation method.The central particle size d50, the logarithmic standard deviation Ina and the sediment mean particle size d were calculated. The d50 and Ina indicate the centralization position and the dispersive degree of particle size in logarithmic normal distribution, respectively; q indicates the position of centre of gravity in particle weight, distribution.Using raw materials with almost same impurity content under the same conditions,we have the following results.