抄録
The photoluminescence of trivalent europium (Eu3+) ions in the vicinity of nanometer-sized gold (Au) particles in glasses has been investigated. Au colloids synthesized in liquid phase are introduced into a borosilicate glass matrix together with Eu3+ ions via a sol-gel route. In order to control in size and protect Au colloids, polyvinylpyrrolidone (PVP) was utilized. It is revealed that a heat treatment of the gel at 400 OC leads to a great enhancement of Eu3+ fluorescence under along ultraviolet excitation, six times higher than without Au nanoparticles. We will discuss on effects of broad photoluminescence due to carbonyl moieties (>C=O) coming from the protective polymer and energy transfer from >C=O to Eu3+ ions in enhanced local fields around Au nanoparticles.
