玻璃基质中ZnS纳米晶Mn^(2+)的EPR谱

EPR SPECTRA OF Mn 2+ IN PYREX GLASSES WITH DISPERSED ZnS:Mn 2+ NANOCRYSTALLITES

用融熔法制备分散有ＺｎＳ：Ｍｎ２＋纳米晶的纳硼硅（Ｎａ２Ｏ－Ｂ２Ｏ３－ＳｉＯ２）玻璃在不同温度、时间对样品进行退火处理，得到不同尺寸的纳米晶．研究了玻璃基质中ＺｎＳ：Ｍｎ２＋纳米晶的ＥＰＲ谱、微波功率饱和ＥＰＲ谱及发射光谱，发现Ｍｎ２＋有二种组态，即替位组态和间隙位组态．分析结果表明替位组态Ｍｎ２＋及周围立方晶场的畸变程度直接影响光学发光特性．

Na 2O-B 2O 3-SiO 2 pyrex glasses with ZnS:Mn 2+ nanocrystals were prepared by melt method. The characteristics of EPR spectra and emission spectra of Mn 2+ ions in pyrex glasses with dispersed ZnS:Mn 2+ nanocrystals were studied. Sample e (ZnS:Mn 2+ /glasses 10%) were detected under 6.5mW and 200mW microwave power. It was found that there are two configurations of Mn 2+ ions in the samples, or (Mn 2+ ) substitution and (Mn 2+ ) interstitial configurations. The research results show that the substitution state Mn 2+ ions and distortion degree of cubic crystal fields directly effects luminous characteristic. The other of configuretions for the effects of luminous characteristic also were discussed. These results can be used to address the question of the physical origin of the high efficiency transfer and shortened radiative lifetime seen in photoluminescence.