蓝绿色荧光粉Ba_(1.3)Ca_(0.7--x--y)Zn_xSiO_4∶yEu^(2+)的晶体结构和光谱性能

Crystal Structure and Luminescent Properties of Blue-Green Phosphors Ba_(1.3)Ca_(0.7--x--y)Zn_xSiO_4∶yEu^(2+)

采用高温固相法在还原气氛中合成蓝绿色Ba1.3Ca0.7--x--yZnxSiO4∶yEu2+荧光材料。研究Zn2+/Ca2+的摩尔比对基质骨架晶体结构及不同Eu2+掺量对荧光粉光谱性质的影响。结果表明:Zn2+的含量x为0.10~0.40时,Zn2+取代Ca2+能够形成固溶体,样品的晶体结构为Ba1.3Ca0.7SiO4。在277~368nm紫外光激发下,发射光谱为430~560nm的连续谱带,具有峰值波长为460、504nm的2个发射峰。利用Van Uitert经验公式计算了Eu2+取代Ba2+(Ca2+)时所占晶体学格位。

The blue-green light-emitting Ba1.3Ca0.7-x-yZnxSi04：yEu2＋ phosphors were synthesized via high-temperature solid- state reaction in the reducing atmosphere. The effects of Zn2＋/Ca2＋ mole ratio and Eu2＋-doped amount on the matrix crystal structure and spectra properties of the phosphors were investigated. The results show that the content range of Zn2＋ is from 0. 10 to 0. 40, Zn2＋ replaces Ca2＋ to form the solid solution, and the crystal structure of sample is Bal. 3 Ca0. 7 SiO4. Under the UV-light excitation at 277-368 nm, the emission spectrum is a continuous hand of 430-560 nm, and two different emission peaks of wavelengths 460 and 504 nm appear. The empirical formula of the Van Uitert was used to calculate the crystallography sites of Ba2＋ （Caz＋ ） replaced by Eu2＋.