制备了具有多彩上转换荧光Tm3+/Yb3+,Ho3+/Yb3+和Tm3+/Ho3+/Yb3+掺杂铋碲酸盐玻璃,并研究了974 nm激光激发下的上转换荧光光谱。在Tm3+/Ho3+/Yb3+三掺杂体系中,由于Tm3+的上转换蓝光发射属三光子过程,蓝光发光强度随激发功率增加而增长的速率大于绿光和红光。计算了Tm3+/Ho3+/Yb3+三掺样品上转换荧光的色坐标,定性阐述了荧光色坐标与激发功率的关系,揭示出随着激发功率的增大,色坐标在1931-CIE色品图中向左下方移动趋势。研究结果表明,在Tm3+/Ho3+/Yb3+三掺铋碲酸盐玻璃中,通过功率调谐可以调整样品的上转换蓝光、绿光和红光强度比例,实现上转换白光发射,证实了Tm3+/Ho3+/Yb3+三掺铋碲酸盐玻璃是一种高效上转换材料,在多彩显示和白光照明领域具有潜在的应用前景。

Tm3+/Yb3+,Ho3+/Yb3+ and Tm3+/Ho3+/Yb3+ doped bismuth tellurite glasses exhibiting multicolor upconversion fluorescences are fabricated,and the upconversion fluorescence spectrum is investigated under 974 nm laser excitation. Because the blue upconversion luminescence of Tm3+ is a three-photon process,the increasing rate of blue emission is higher than the green and red ones in the Tm3+/Ho3+/Yb3+ triply doped bismuth tellurite glasses. The color coordinates of the sample are calculated,and the dependence of color coordinates on the pumping power is described. With the pumping power increasing,the color coordinate marks move along the down-left direction in 1931-CIE chromaticity diagram. The results indicate that the relative ratios of green,red and blue emission intensities can be tuned by adjusting pumping power,and white lighting could be realized in Tm3+/Ho3+/Yb3+ triply doped bismuth tellurite glasses. It confirms that Tm3+/Ho3+/Yb3+ doped bismuth tellurite glasses are effective upconversion materials and will be potentially employed in the application field of multicolor display and white light illumination.