SPR-Enhanced Fluorescence of Solid Organic Dye Films

Qing Fu,Jianguo Tang,Peipei Yan,Linjun Huang,Haiyan Liu,Xiaolin Zhang,Yanxin Wang,Yao Wang,Laurence A Belfiore,Shichao Wang,Xinzhi Wang

doi:10.1155/2018/5268458

Abstract

This paper presents strong fluorescence of spin-coated fluorescent solid organic dye films (SODF) enhanced by surface plasmonic resonance (SPR). In order to manifest the influence of SPR effect on enhancement of organic dye (OD) fluorescence, the organic dye embedded Ag@SiO2 fluorescent films were developed on the glass sheet substrate, in which Ag@SiO2 nanoparticles were embedded in the middle and organic dye was as upper layer. The morphology of the SODFs with and without Ag@SiO2 particles was studied by SEM and EDX, and the tests revealed that the Ag@SiO2 nanoparticles distributed evenly between glass sheet and OD layer. Optical properties were characterized by UV absorption and fluorescence spectroscopy; the lifetime of SODF was tested to discuss the mechanism of SPR enhancement of fluorescence. The results proved that the existence of Ag@SiO2 particles enhanced the fluorescence intensity for 7 times and thus proved the SPR effect for organic dye, especially when the organic dye is the solid films. Therefore, the most important is the creation that the SPR effect of Ag@SiO2 particles works very well under solid organic dye coverage.

Highlights

In recent decades, organic fluorescent dyes have been widely used in many fields due to their superior properties including good optical property like high luminescence efficiency, rich variety of derivatives and relatively complete spectrum [1]
The size of Ag and Ag@SiO2 particles used in the work was kept in the range showed in Figure 1 to avoid the influence of size on the surface plasmonic resonance (SPR)-enhanced fluorescence
This paper mainly discussed SPR-enhanced fluorescence in solid organic dye films (SODF) which were prepared by means of spin coating

Summary

Introduction

Organic fluorescent dyes have been widely used in many fields due to their superior properties including good optical property like high luminescence efficiency, rich variety of derivatives and relatively complete spectrum [1]. The good optical properties of rhodamine only appear in dilute solvents, when it is in high concentration or solid state, fluorescence quenching occurs because of the aggregate of rhodamine molecules This phenomenon appeared in rhodamine and in other fluorescent dyes. SPR was performed by combining the amplification of the incident electric field at or near the surface of nanoparticles and the coupling of excited organic dyes (ODs) with the electrons in the particles [14, 15] It can increase the fluorescence intensity of the organic dye, reduce its fluorescence lifetime, and improve the photochemical stability at the same time [16,17,18]. With the optimized Ag@SiO2 distribution and concentration under spin-coated SODF, the fluorescent intensity has enhanced by 7 times comparing with non-SPR-. SODFs, it can be applied in practical utilization like transportation safety and security, optoelectronic devices, energy transform in the films become possible

Experimental Section

Results and Discussion

Conclusion