新型白光LED荧光粉Y_2O_3:Ti^(3+)的光谱性能

Spectroscopic properties of new phosphor Y_2O_3:Ti^(3+) for white LEDs

采用共沉淀法,在不同的烧结气氛下制备了Y_2O_3:Ti^(3+)粉体,测量了它们的激发、发射光谱以及XRD光谱,观测了形貌。在紫外光激发下,微晶Y_2O_3:Ti^(3+)在439 nm附近有较强的发射带,而纳米Y_2O_3:Ti^(3+)在400～500 nm范围内出现了强的发射带。随纳米粉体的晶粒尺寸减小,它的发光明显增强,覆盖了整个可见光区。结果表明Y_2O_2:Ti^(3+)纳米粉体有望成为新一代白光LED或汞灯的光转换荧光粉。

Y2O3：Ti^3＋ powders were prepared by coprecipitation method at different temperatures in different sintering atmospheres. XRD spectra, excitation and emission spectra of Y2O3：Ti^3＋ powders were measured, and their morphologies were observed. Under the excitation of UV light, Y2O3：Ti^3＋ microcrystalline has a strong emission band near 439nm, and Y2O3：Ti^3＋nanocrystalline has a more stronger emission band in the range of 400 - 500 nm. The fluorescence of Y2O3：Ti^3＋ nanopowder becomes strong observably as the grain size reduces, and the fluorescence covers whole visible light region. This indicates that Y2O3：Ti^3＋ nanopowder is expected to become a new generation light conversion phosphor for white LED or mercury lamp.