采用高温固相法制备了一系列Dy 3+,Sm 3+共掺杂的KAlSiO4荧光粉材料。实验结果表明,少量Dy 3+,Sm 3+的掺入没有改变KAlSiO4的晶体结构。当用Dy 3+的特征激发波长激发KAlSiO4∶1%Dy 3+,w% Sm 3+时,发射光谱显示,样品中存在从Dy 3+到Sm 3+的共振非辐射能量传递,同时色坐标移动很小,并发生了528 nm处的红移和713 nm处的蓝移现象;当用Sm 3+的特征激发波长激发KAlSiO4∶1.5% Sm 3+,v% Dy 3+时,发射光谱与KAlSiO4∶1.5% Sm 3+发射光谱相似,没有出现Dy 3+的特征发射峰,但Sm 3+在651 nm处的发光强度提高了6.5倍。这说明没有发生从Sm 3+到Dy 3+的能量回传,Dy 3+的引入促进了晶格的匹配,使得Sm 3+的发光强度得到大幅增强。通过理论计算得出从Dy 3+到Sm 3+的能量传递效率最高可达52%,能量传递相互作用是电四级-电四级相互作用。荧光粉的色坐标均在(0.41,0.51)附近,位于黄绿色区域。386 nm激发下的内量子产率从25.8%逐渐提高到42.6%。

A series of Dy 3+, Sm 3+ co-doped KAlSiO4 phosphor materials were prepared by the high temperature solid phase method. The experimental results show that the doping of a small amount of Dy 3+ and Sm 3+ does not change the crystal structure of KAlSiO4. When KAlSiO4∶1% Dy 3+, w% Sm 3+ is excited at the characteristic excitation wavelength of Dy 3+, there occurs a resonant non-radiative energy transfer from Dy 3+ to Sm 3+ in samples. Meanwhile, the color coordinate shift is very small and there exists a red shift at 528 nm and a blue shift at 713 nm. In contrast, when KAlSiO4∶1.5% Sm 3+, v% Dy 3+ is excited at the characteristic excitation wavelength of Sm 3+, the emission spectrum is very similar to that of KAlSiO4∶1.5% Sm 3+ and there are no characteristic emission peaks of Dy 3+. However, the luminous intensity of Sm 3+ at 651 nm is increased by 6.5 times, which indicates that there does not exist energy return from Sm 3+ to Dy 3+ and the doping of Dy 3+ promotes crystal lattice matching and greatly enhances the luminous intensity of Sm 3+. Theoretical calculations show that the maximum energy transfer efficiency from Dy 3+ to Sm 3+ reaches up to 52% and the energy transfer interaction is electric quadrupole-quadrupole interaction. The color coordinates of phosphors are all around (0.41, 0.51) and located in the yellow-green area. The internal quantum yield under 386 nm excitation gradually increases from 25.8% to 42.6%.