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在还原气氛下采用高温固相法合成了钇铝石榴石结构的荧光粉Lu2CaMg2Si3O12∶R(Ce3+,Gd3+),其中Gd3+的浓度变化为1~5 mol%。利用X射线衍射仪对其物相进行分析,结果显示:Ce3+的掺入使晶相结构不稳定,出现了少量杂相,而掺入少量Gd3+时,晶相结构不再变化。利用荧光光谱仪对其光学性能进行研究,结果发现随着Ce的浓度增大,发光强度先增大后减小且同时伴随着少许的发光红移,在2 mol%出现浓度淬灭;Gd的掺入对红移的贡献比较明显,最大波长从561 nm(1%Gd)→568 nm(5%Gd),同时也发现发光强度有明显的下降。这种荧光粉的激发波长在465 nm左右,与蓝光LED芯片的发射中心相吻合,而且发射峰明显比YAG要长,所以这种荧光粉能很好的补充YAG的显色性。
The phosphor Lu2CaMg2Si3O12:R (Ce3 +, Gd3 +) with the structure of Yttrium Aluminum Garnet was synthesized by high temperature solid-state reaction in reduction atmosphere, in which the concentration of Gd3 + varied from 1 to 5 mol%. The phase composition was analyzed by X-ray diffractometer. The results showed that Ce3 + did not stabilize the crystal structure and formed a small amount of heterogeneous phase. When a small amount of Gd3 + was added, the crystal structure did not change. Fluorescence spectroscopy was used to study its optical properties. The results showed that with the increase of Ce concentration, the luminescence intensity firstly increased then decreased and accompanied by a little luminescence red-shift, quenched at 2 mol% The contribution to the redshift is significant, with the maximum wavelength ranging from 561 nm (1% Gd) to 568 nm (5% Gd), with a significant decrease in luminescence intensity. The excitation wavelength of this phosphor is about 465 nm, coinciding with the emission center of the blue LED chip, and the emission peak is obviously longer than YAG, so this phosphor can well complement the color rendering of YAG.