White-light emission and chromaticity characterization of Dy3+ doped fluoride glass for standard white light source

摘要

In this paper, we reported the white light emission properties of Dy3+ doped ZrF4-BaF2-AlF3-NaF (ZBAN) glass. Physical properties of the host glass were examined. The intensity parameters were determined from Judd-Ofelt theory based on the absorption spectrum. The chromaticity coordinates calculated using emission spectrum are located in the white area of the CIE chromaticity diagram. Judd-Ofelt theory was used to analyze the relationship between the Dy3+ doping concentration and the yellow/blue ratio of the fluorescence. Furthermore, the change of chromaticity coordinates in the CIE chromaticity diagram was predicted. Anomalous change caused by fluorescence quenching at high concentrations was also discussed. In order to find the fluorescence closest to the equal energy light, the chroma difference between the fluorescence and the equal energy point was calculated. These results demonstrate that Dy3+ doped fluoride glass is a suitable material for use as a standard white light source.