采用高温固相法合成Eu~(2+)激活的碱土金属氯硅酸盐系荧光粉M_7Mg_2(SiO_4)_4C1_2: 0.08Eu~(2+)(M=Ca,Sr,Ba),研究了它们的荧光光谱.结果表明,3种荧光粉均为宽带激发,激发带位置分别在250～500 nm、250～450 nm、250～430 nm.讨论了Eu~(2+)离子的跃迁发射随基质组成的变化规律,随着Ca、Sr、Ba离子半径的依次增大,发射波长逐渐向短波方向移动,分别产生绿(507 nm)、蓝(458、445 nm)不同颜色的发射光.
The alkaline earth metal magnesium chlorosilicate M_7Mg-2(SiO_4)_4C1_2:0.08Eu~(2+)(M=Ca,Sr,Ba) phosphors activated by Eu~(2+) were synthesized by high-temperature solid-state reaction, and the luminescence properties of the phosphors were studied. Results show that all the three phosphors have broadband excitation spectra with ranges of 250-500 nm, 250-450 nm, 250-430 nm, respectively. The composition dependence of the radiation transitions of Eu~(2+) in the host was discussed. The position of emission peak of Eu~(2+) moved to short-wavelength and the phosphors emit green (507 nm) and blue (458 nm, 445 nm) light with increasing of radius size of Ca, Sr and Ba ions in sequence.
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