材料期刊网

将具有20～30 nm 尺寸微孔的氧化硅玻璃投入共掺Yb3+/Er3+氟锆酸盐玻璃熔体中约10 s制作复合玻璃材料样品.在980 nm LD 激发下观察到样品的 525 nm、540 nm和660 nm 上转换荧光谱.真空油淬火样品 660 nm 峰强度比空气中自然冷却样品的约大 2 倍, 而比体材料共掺Yb3+/Er3+氟锆酸盐玻璃样品的约大 4 倍. 660 nm 峰强度与激发光强度约成 2 次方关系(1.94).上转换起因于双光子吸收.微孔收缩所致内压强及结晶导致化学键缩短, 可能是 660 nm 峰强度变化的原因.

The composite samples were made by sinking nanoscale porous silica glass with the pore sizes of 20～30 nm in the Yb3+/Er3+ co-doped fluorozirconate glass melt to irrigate the pores of the silica glass within a few seconds. The samples were pumped by a LD at 980 nm and the up-conversion peaks at 525 nm, 540 nm, 660 nm were observed. The intensity of the band at 660 nm of the composite samples quenched in vacuum pump oil is about twice of that of the composite samples cooled in air, and four times of that of the bulk Yb3+/Er3+ co-doped fluorozirconate glass. The dependence of the fluorescence intensity at 660 nm on the pumping intensity was found to obey approximately a square power law with the exponent of 1.94. Two-photon absorption effect is considered to be responsible for the up-conversion effect of the samples. Chemical bonds'length shortening of the nanoscale fluorozirconate due to high pressure caused by the shrinkage of the silica skeleton is considered to raise phonon energy, which in turn promotes radiative efficiencies of the 660 nm fluorescence in the composite samples.