Zhou Li-Yai, Xu Ting-Bo, Pang Qi, Gong Fu-Zhong, Wang Wei, Huang Jun-Li, Yi Ling-Hong
School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2009 Nov;29(11):2897-900.
The phosphors Zn(1-x) Mo(1-y)Si(y)O4 : Eu(x)3+ (0.05 < or = x < or = 0.30, 0 < or = y < or = 0.09) were prepared by solid state reaction technique at 800 degrees C. The powder X-ray diffraction patterns of the samples show that the phosphors are of single phase and the doping Eu ion and Si ion have little influence on the host structure. The effects of flux and calcination temperature on the luminescent properties of the phosphors were investigated. The results showed that flux content has effects on the luminescent properties, and the optimized flux content and the best calcination temperature is 4% and 800 degrees C, respectively. The presence of the Na+ ion strengthens the photoluminescence intensity of the phosphors. The addition of Na+ ions balanced the charge in samples, enhanced the luminescence intensity of samples, and the luminescence intensity reached the maximum when the doping concentration of Na2 CO3 was 4 Wt%. The luminescent properties of Zn0.80 Mo(1-y)Si(y)O4 : Eu(0.20)3+ were studied by the excitation and emission spectra, and the influence of Eu3+ and Si4+ concentrations on the luminescent property was discussed. As the calcination temperature rises from 700 to 800 degrees C, the emission intensity increases due to the improvement of crystallinity. The excitation spectra consist of a broad band and a series of narrow lines, and the narrow lines are attributed to the intrinsic transition from 7FJ (J = 1-4) to 5DJ (J = 0, 1) of Eu3+. It was found that the PL emission intensity was enhanced with the increase in the Eu3+ doping ratio and reached a maximum value at x = 0.20. The result indicated that Zn(1-x)Mo(1-y)Si(y)O4 : Eu(x)3+ phosphors can be excited effectively at 393 and 464 nm light. The presence of the Si4+ ion strengthens the photoluminescence intensity of the phosphors and the strong red emission lines at 616 nm correspond to the forced electric dipole 5D0 --> F2 transitions on Eu3+. Compared with Y2O2S : 0.05 Eu3+, the obtained Zn0.80Mo0.97Si0.03O4 : Eu(0.20)3+ phosphor shows an enhanced red emission under 393 nm excitation and the emission intensity of Y2O2S : 0.05Eu3+ is only 50% of that of Zn0.80Mo0.97Si0.03O4 : Eu(0.20)3+. The optical properties suggest that Zn0.80Mo0.97Si0.03O4 : Eu(0.20)3+ is an efficient red emitting phosphor for light emitting diode (LED) applications.
采用固态反应技术在800℃制备了磷光体Zn(1 - x)Mo(1 - y)Si(y)O4 : Eu(x)3+（0.05≤x≤0.30，0≤y≤0.09）。样品的粉末X射线衍射图谱表明，磷光体为单相，掺杂的Eu离子和Si离子对主体结构影响较小。研究了助熔剂和煅烧温度对磷光体发光性能的影响。结果表明，助熔剂含量对发光性能有影响，优化的助熔剂含量和最佳煅烧温度分别为4%和800℃。Na+离子的存在增强了磷光体的光致发光强度。Na+离子的加入平衡了样品中的电荷，提高了样品的发光强度，当Na2CO3的掺杂浓度为4 wt%时发光强度达到最大值。通过激发光谱和发射光谱研究了Zn0.80Mo(1 - y)Si(y)O4 : Eu(0.20)3+的发光性能，并讨论了Eu3+和Si4+浓度对发光性能的影响。随着煅烧温度从700℃升高到800℃，由于结晶度的提高，发射强度增加。激发光谱由一个宽带和一系列窄线组成，窄线归因于Eu3+从7FJ（J = 1 - 4）到5DJ（J = 0, 1）的本征跃迁。发现PL发射强度随着Eu3+掺杂比例的增加而增强，并在x = 0.20时达到最大值。结果表明，Zn(1 - x)Mo(1 - y)Si(y)O4 : Eu(x)3+磷光体在393和464 nm光下能被有效激发。Si4+离子的存在增强了磷光体的光致发光强度，616 nm处的强红色发射线对应于Eu3+上的强制电偶极5D0→F2跃迁。与Y2O2S : 0.05 Eu3+相比，所制备的Zn0.80Mo0.97Si0.03O4 : Eu(0.20)3+磷光体在393 nm激发下显示出增强的红色发射，且Y2O2S : 0.05Eu3+的发射强度仅为Zn0.80Mo0.97Si0.03O4 : Eu(0.20)3+的50%。光学性能表明Zn0.80Mo0.97Si0.03O4 : Eu(0.20)3+是一种用于发光二极管（LED）应用的高效红色发光磷光体。
