Abstract
Noble metal embedded glasses have been studied as promising candidates for a variety of technological applications, mainly due to their ability to enhance rare earth luminescence properties. In this work, Ag:Eu-co-doped calcium boroaluminate glasses were prepared and submitted to further heat treatment to form different Ag species. The optical and luminescence properties were investigated in terms of heat treatment times. Absorption spectra showed a successful Eu and Ag ion incorporation in the host, as well as Ag nanoparticle precipitation induced by heat treatment. Upon UV-light excitation, the co-doped glasses exhibited an intense wide emission band centered at about 500 nm, attributed to molecule-like silver species, which combined with the Eu3+ characteristic emission reaches a white light resultant emission. A new excitation band for Eu3+ at 335 nm and a silver luminescence lifetime decrease suggest an energy transfer process from molecule-like Ag to Eu3+ as being responsible for the enhanced PL properties in these glasses. An appropriate combination of a violet LED with the sample emission provides a route to achieve the ideal white light CIE color parameters. The relevant quality color results qualify these glasses as phosphors with high potential for white light emitting devices.
Highlights
Arti cial lighting is present in all segments of society, making it crucial to develop new more efficient and more economical light emitting devices
Special attention has been given to silver co-doped glass due to the fact that several Ag species can be formed during the Ag NPs precipitation processes
Jimenez et al.[15] concluded that Eu3+ luminescence enhancement is a result of energy transfer processes from molecule-like Ag species to Eu3+ ions whereas Ag NPs provide a path for the non-radiative loss of excitation energy leading to a PL quenching effect
Summary
Arti cial lighting is present in all segments of society, making it crucial to develop new more efficient and more economical light emitting devices. The Ag NC emission band covers approximately all the visible range (350 to 750 nm) and it is more efficient when excited in the range of 325 to 430 nm.[8,9,20,21] When combined with the RE luminescence properties, the Ag NC emission band may provide a broad band white light with higher quality parameters, such as high color rendering index (CRI) and low correlated color temperature (CCT) In this context, with the aim of contributing to further understanding of the interaction between noble metals and RE ions in glass hosts, and developing new materials for arti cial light emitting devices, we have studied the spectroscopic properties of calcium boroaluminate (CaBAl) glass co-doped with silver and europium. The lifetime instrumental measurement error was estimated to be 1%
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