玻璃基质中ZnS纳米晶Mn2+的EPR谱

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.

EPR SPECTRA OF Mn2+ IN PYREX GLASSES WITH DISPERSED ZnS:Mn2+ NANOCRYSTALLITES

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.