白光LED用Ca_2SiO_3Cl_2:Tb^(3+)单一基质荧光粉的制备及性能研究

Study on preparation and luminance properties of the single phosphor Tb^(3+) doped Ca_2SiO_3Cl_2 for WLED

采用溶胶-凝胶法在较低温度下合成了不同浓度Tb3+掺杂的Ca2SiO3Cl2∶mTb3+单一基质白光荧光粉,并对其发光性质进行了研究。近紫外光激发下,发射光谱出现了明显的多色谱(415、440、460、486、544、595、619和700 nm)混合后发射白光。随着Tb3+浓度的增加,蓝光强度先增强后减弱,绿光不断增强,红光不断减弱,当m=0.003时荧光粉的色坐标为x=0.3174,y=0.3485,非常接近标准白光(x=0.33,y=0.33),样品呈现色温TC=6161K的正白色发光。Ca2SiO3Cl2∶Tb3+是一种具有良好白光发射的LED用单一基质荧光粉。

Ca2SiO3Cl2∶mTb3＋ single white phosphors were synthesized by sol-gel at lower temperature studied.The phosphor shows some major emission peaks locating at 415,440,460,486,544,595,619 and 700nm by the near ultraviolet excitation which were mixed to white emitting.The blue emission increased firstly and then decreased with Tb3＋ increased,whereas the green emission increased and the red emission decreased.When m=0.003,the chromaticity coordinates of the phosphor was x=0.317,y=0.3485,very closed to the standard white light（x=0.33,y=0.33）,and it also shows middle-white emission（TC=6161K）.Ca2SiO3Cl2∶Tb3＋ is a kind of single phosphor with well white emitting properties used for WLED.