Eu3＋掺杂生物多孔硅酸钙发光材料性能

Enhancement of light harvesting,luminescence and afterglow of Eu^(3+) doped calcium silicate through biogenic pore hierarchy

自然界天然存在的微结构可以有效提高材料的性能,特别是分级纳米孔结构被证明可以有效增加材料的光吸收效率。为了提高硅酸钙材料的发光性能,以树叶为模板所制备了Eu3+掺杂硅酸钙发光材料,并进行了光吸收、发光和余辉发光性能的测试。研究结果表明,以树叶为模板所制备的Eu3+掺杂硅酸钙发光材料具有2.5nm、3.0nm、10.0～20.0nm孔径的生物分级孔结构,可以有效增加发光材料的表面积和孔容,使材料有更多的光接触面积来增加光子的吸收,从而增加发光材料被激发活性的比例和Eu3+离子被激发发光的概率并使材料有较高的载流子陷阱密度和较深的陷阱深度,从而有更高的荧光和余辉发光的强度。

Natural microstructures in plants and animals can effectively enhance the performance of the materials,espe-cially the hierarchical nano-porous structure,which is demonstrated to have significant positive effect on light harvesting ef-ficiency.In order to improve the performance of calcium silicate phosphor,a leaf-templated Eu3 ＋ doped calcium silicate phosphor was investigated with light-harvesting,luminescence and afterglow performance experiments.The results showed that the leaf-templated Eu3 ＋ doped calcium silicate phosphor possessed a biogenic hierarchical porous structure,which is comprised of nano-pores with diameters ranging from 2.5 nm,3.0 nm and 10.0 ～ 20.0 nm.This structure allows a much larger surface area to interact with incident light and a higher proportion of excited Eu3 ＋ ,therefore leading to enhanced light-harvesting capability in the UV-Vis range and higher light-utilization efficiency to produce stronger luminescence and prolonged afterglow.