高硅氧发光玻璃的制备及其荧光性能

石英玻璃具有低膨胀、耐热冲击、高机械强度和高化学隐定性等优点,是稀土和过渡金属发光离子掺杂的优选的基质材料。但发光离子在石英玻璃中容易自发形成团簇,产生浓度淬灭效应,介绍一种用二氧化硅质量分数超过95%的纳米微孔玻璃来抑制发光离子团簇的自发形成的新方法,以制备高发光强度的石英破璃和激光玻璃。该方法是将发光离子浸入微孔玻璃中并在适当气氛中烧结,目前已经制得多种颜色、量子效率接近于1的强发光玻璃,真空紫外光激发发光玻璃,高铒离子掺杂的高硅氧玻璃,还获得了新颖的低膨胀、耐高温的掺钕高硅氧激光玻璃和掺铋红外宽带发光玻璃用这种方法还容易进行多种发光活性离子掺杂,实现不同离子间的能量转换,提高发光强度和改变激发光的波长范围。这种新方法有望扩大石英发光玻璃的应用范围。

PREPARATION AND FLUORESCENCE PROPERTIES OF HIGH SILICA LUMINESCENT GLASSES

Silica glass is an attractive host matrix for the emission ions of rare earth and transition metal ions because it has small thermal expansion coefficient,strong thermal resistance,large fracture strength and good chemical durability and so on.However,a major obstacle to using it as the host matrix is a phenomenon of concentration quenching.In this paper,we introduces a novel method to restrain the concentration quenching by using a porous glass with SiO_2 content>95% (in mass) and prepare intense fluorescence high-SiO_2 glasses and high-SiO_2 laser glass.The porous glass with high-SiO_2 content was impregnated with rare-earth and transition metal ions,and consequently sintered into a compact non-porous glass in reduction or oxidization atmospheres. Various intense fluorescence glasses with high emission yields,a vacuum ultraviolet-excited intensely luminescent glass,high silica glass containing high concentration of Er~(3-) ion,ultrabroad infrared luminescent Bi-doped high silica glass and Nd~(3 )-doped silica microchip laser glass were obtained by this method.The porous glass is also favorable for co-impregnating multi-active-ions.It can bring effective energy transferring between various active ions in the glass and increases luminescent intensity and extend range of excitation spectrum.The luminescent active ions-doped high-SiO_2 glasses are potential host materials for high power solid-state lasers and new transparent fluorescence materials.