Plasmon-Enhanced Fluorescence of Phosphors Using Shell-Isolated Nanoparticles for Display Technologies
ACS APPLIED NANO MATERIALS(2020)
摘要
Plasmonics has attracted considerable interest due to its promising applications in optical technology, with particular attention recently being focused on the plasmon-enhanced emission of phosphors. Phosphor is an important component of phosphor-converted LEDs (pc-LEDs) which are deemed the next-generation display lighting source, but it suffers from low intrinsic efficiencies. Plasmonics can be used to enhance the optical properties of phosphors for LEDs. However, energy-transfer processes from the phosphor to the plasmon-enhancing metal can significantly quench fluorescence signals, limiting the applications of such phosphors. Herein, the fluorescence of a commercial phosphor was enhanced by using shell-isolated Ag nanoparticles (Ag-SHINs) "satellite structures" (phosphor@Ag- SHINs). As a universal strategy, large fluorescence enhancements were achieved by coupling phosphor fluorescence wavelengths with the localized surface plasmon resonance (LSPR) wavelength of structurally optimized Ag-SHINs satellites. Three-dimensional finite difference time domain (3D-FDTD) simulations and lifetime tests showed the enhancement in phosphor fluorescence signals resulted from acceleration of spontaneous emission rates by the local optical density of states (LODS) generated by the Ag-SHINs satellites. This work provides an effective avenue for enhancing phosphor fluorescence signals with potential practical applications in display technologies.
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关键词
plasmon-enhanced fluorescence,shell-isolated nanoparticle,SPR,phosphor,satellite,light-emitting diodes,3D-FDTD
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