空心上转换纳米结构的可控制备、荧光增强效应与应用  

The controlled fabrication of upconverting hollow structures,enhanced effect on photoluminescence and applications

作　　者：宗玲博 Lingbo Zong(Taishan Scholar Advantage and Characteristic Discipline Team of Eco Chemical Process and Techmblogy,College of Chemistry and Molecular Engineering,Qingdao University of Science and Technology,Qingdao 266042,China)

机构地区：[1]青岛科技大学化学与分子工程学院泰山学者优势特色学科生态化工过程与技术团队

出　　处：《科学通报》2019年第34期3594-3606,共13页Chinese Science Bulletin

基　　金：国家自然科学基金(51702180);泰山学者优势特色学科和青岛市源头创新计划-人才发展专项(18-2-2-52-jch)资助

摘　　要：上转换发光材料具有光稳定性好、荧光寿命长、斯托克斯位移大、发射带宽窄等优点,其广泛地应用在激光、显示、防伪、生物医学等领域.空心结构具有有效密度低、担载量大、壳层数目与壳层间距可调等特点,同时空心结构能够对光进行多级反射、提高光的利用率、实现电场密度再分布等.因此,制备镧系离子掺杂的空心结构上转换发光材料,探究制备机理、空心结构与发光增强的构效关系以及应用具有重要意义.空心结构的制备方法包括:硬模板、软模板、自模板等.鉴于碳球硬模板法的普适性以及可控性,因此碳球硬模板法是比较常用的方法.对近年来碳球硬模板法等在制备镧系离子掺杂的空心结构方面取得的成果进行介绍,讨论了空心结构与上转换发光性能增强的机制.上转换发光性能增强源于激发光的多级反射导致的高的激发光的捕获率,反射与散射共同作用诱导的强化电场密度以及等离子体共振作用导致的辐射效率增强.最后就空心结构的上转换发光材料的应用、挑战与未来的发展方向进行了分析与展望.Lanthanide-doped upconverting photoluminescence nanomaterials which exhibit excellent photostability,long luminescent lifetimes,large anti-Stokes shifts and sharp-band emissions have attracted considerable attention in various research domains,including lasing,displays,anti-counterfeiting,biological systems.Hollow structures possess attractive physicochemical characteristics such as low density,high loading capacity.More importantly,they also possess multiple adjustable shells numbers,shell thickness and inter-shell spaces.Hollow structures can also generate multiple reflection and scattering of incident light by the adjustable inner structures,which is beneficial to the enhancement of light harvesting efficiency and modulation of electric field density.Therefore,it is of great importance to do intense research on developing lanthanide-doped photoluminescence hollow structures(LPHS).Hollow structures with various morphologies and compositions have been fabricated by many approach,such as hardtemplate method,soft-template strategy,self-template tactics and other techniques.However,the controllabl esynthesis of hollow structures remained a great challenge by using soft-template strategy,which impede the synthesis of hollow structures.With the good repeatability and generality,carbonaceous spheres hard-template method has been demonstrated a straightforward and versatile technique to prepare uniform LPHS.By using carbonaceous spheres hard-template method,the diversity of LPHS has been flourished in both geometrical morphology and composition.Benefiting from the enrichment of synthetic method,various LPHS have been prepared and employed in many domains.However,enhanced effect on photoluminescence remained indistinct,which impede the design of excellent LPHS.Herein,we focus on efforts on synthesis,enhanced effect on photoluminescence and application of LPHS.We first review efforts in geometrical and compositional manipulation based on carbonaceous spheres hard templates approach.After reviewing the compositional and g

关 键 词：上转换发光 空心结构 荧光增强 应用 

分 类 号：G63[文化科学—教育学]