Nanostructured Metal-Enhanced Photoluminescence of Micro-Sr2Si5N8:Eu2+ Phosphors

The enhancement of the photoluminescence of micro-Sr2Si5N8:Eu2+ phosphors on the surface of Ag and Au nanoparticles is studied. Ag nanoparticles cause a considerable enhancement in the photoluminescence intensity of microsized Sr2Si5N8:Eu2+ phosphors. We further investigate the enhanced emission of self-assembled wormlike Au nanoparticles from Sr2Si5N8:Eu2+ phosphors. A brightness photoluminescence intensity enhanced by about six times is observed, and is due to the stronger scattering and higher numbers of hot spots in the Au worms. The luminescence efficiency of the microparticles is higher than the nanoparticles, and it is very difficult to enhance light emission. Therefore, the realization of microphosphor photoluminescence enhancement is a great breakthrough.