Abstract
The Ag/Eu singly-doped and co-doped glasses were prepared with a melt-quenching method. Silver species are identified as Ag+, molecule-like Ag nano-clusters (Ag NCs) and Ag nano-particles (Ag NPs) with surface plasmonic resonance (SPR) behaviors in the Ag-doped glasses (GAg and GAgEu) by absorption and photoluminescence spectra. Europium ions, including Eu2+ and Eu3+, also existed in the Eu-doped glasses (GEu and GAgEu). The formation of Ag NCs was found to be effectively promoted by an accompanied oxidation of Eu2+. This significantly enhances the super-broad visible emission of the Ag/Eu co-doped glass (GAgEu) by about 8 times than the Ag-doped glass (GAg). Owing to energy transfer from silver species (Ag+ and Ag NCs) to Eu3+, the UV excitation of the Eu3+ red emission was enhanced and extended in 240nm– 400nm region. Combining the bluish white emission of Ag NCs and the red emission of Eu3+, the Ag/Eu co-doped glass (GAgEu) emits pure white light with a low color temperature (CCT) and a high color rendering index (CRI), thus can be a candidate for LED illumination.
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