Wang Mingzhong, Xu Longxuan, Chen Guowei, Zhao Xiaopeng
Smart Materials Laboratory, Department of Applied Physics , Northwestern Polytechnical University , Xi'an 710129 , P.R. China.
ACS Appl Mater Interfaces. 2019 Jan 16;11(2):2328-2335. doi: 10.1021/acsami.8b20046. Epub 2018 Dec 24.
Improving luminescent intensity is a significant technical requirement and scientific problem for the luminescent performance of fluorophor materials through the ages. The process control and luminescence performance still limit the developments of luminescent intensity even though it can be improved partly by covering or magnetron sputtering of precious metals on the surface of the fluorophore materials. On the basis of the improvement of luminescence center radiative transition rate by surface plasma resonance and YO:Eu microsheet phosphors, a fundamental model for topological luminophor YO:Eu+Ag was designed through referencing the concepts of topological materials to enhance luminescent performance by composite luminescence, which is composed of Eu centric electroluminescence and surface plasma-enhanced photoluminescence by Ag. The topological luminophor YO:Eu+Ag was successfully synthesized with an asymmetric-discrete Ag nanocrystal topological structure on the surface just via illumination. Experimental results suggest that the luminescence performance of topological luminophor YO:Eu+Ag increased by about 300% compared to that of YO:Eu phosphors in the same conditions. The design of a topological luminophor provides a new approach to further improve the luminescent intensity of phosphors.
提高发光强度一直是历代荧光材料发光性能的一项重要技术要求和科学问题。尽管通过在荧光材料表面包覆或磁控溅射贵金属可以部分提高发光强度，但工艺控制和发光性能仍然限制着发光强度的发展。基于表面等离子体共振和YO:Eu微片荧光粉提高发光中心辐射跃迁速率，通过借鉴拓扑材料的概念，设计了一种拓扑荧光体YO:Eu+Ag的基本模型，通过复合发光来提高发光性能，该复合发光由Eu中心电致发光和Ag表面等离子体增强光致发光组成。通过光照成功合成了表面具有不对称离散Ag纳米晶体拓扑结构的拓扑荧光体YO:Eu+Ag。实验结果表明，在相同条件下，拓扑荧光体YO:Eu+Ag的发光性能比YO:Eu荧光粉提高了约300%。拓扑荧光体的设计为进一步提高荧光粉的发光强度提供了一种新方法。
