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• With the introduction of Tm3+, Dy3+ can achieve broadband emission between 2600 and 3400 nm. • The mid-infrared fluorescence intensity enhanced with the increase of Tm3+ due to the energy transfer process between Dy3+ and Tm3+. • Larger absorption and emission cross-sections the glass owned, the gain coefficient was also greatly improved. • The fluorescence lifetime at 2.9 μm were prolonged with the addition of Tm3+. We report the 2600–3400 nm strong mid-infrared (MIR) fluorescence emission with the full width at half maximum (FWHM) of 355 nm in the zirconium fluoride glass incorporated with Dy3+, Tm3+ ions. In this paper, Dy3+, Tm3+ ions co-doped ZrF 4 -BaF 2 -LaF 3 -AlF 3 -YF 3 zirconium fluoride glasses are synthesized by high temperature melting method. Structure information is obtained by raman spectroscopy, and the maximum phonon energy of the synthesized glass is 575 cm−1. Optical performance is mainly characterized by transmission spectrum, absorption spectrum and emission spectrum, theoretical analysis is described by Judd-Ofelt (J-O) theory, cross sections and gain coefficient. Under the 808 nm Laser Diode (LD), the 2.9 μm mid-infrared emission intensity is significantly enhanced with the introduction of Tm3+, and the fluorescence lifetime is prolonged 1.85 ms, the relevant energy transfer mechanism has been further analyzed. All results show that the new glass material may be a potential medium for mid-infrared broadband fiber amplifiers and lasers. [ABSTRACT FROM AUTHOR]

Our recent study was focused on the emission from Laser Induced Plasma (LIP) at the delay times of tenths of microseconds after the laser pulse. At these long delays, the spectrum is dominated by the broadband molecular emission and plasma induced luminescence (PIL) produced by a luminescent matrix; only solitary atomic emission lines can be seen. Barium fluoride BaF 2 activated by thulium (Tm) is a famous scintillator that presents the promising object for LIP in terms of both the potential for BaF molecular emission and Tm3+ PIL. The detection of molecular and PIL bands presents a new opportunity for analysis of halogens and rare-earth elements, which are the difficult objects for LIBS. In this paper, we show that the UV, Green, Extreme Red, and Infrared molecular bands from BaF and blue luminescence from Tm3+ are present in the LIP emission spectra while the detection of atomic emission from F I and Tm I was impossible with the same experimental setup. Thus, the detection of molecular emission and PIL can be more sensitive than the traditional detection of emission from atoms and ions. Unlabelled Image • We studied LIBS of BaF 2 activated by Tm3+. • Emission and temporal behavior of BaF molecules were determined. • Plasma Induced Luminescence of Tm3+ was found. [ABSTRACT FROM AUTHOR]

• Dy3+: ZBAN glass was synthesized and satisfactory white fluorescence was obtained. • The trend of fluorescence color coordinate is estimated by J–O parameters. • Chroma difference in CIELAB coordinates was used to evaluate fluorescence. • Energy of Dy3+: ZBAN glass fluorescence is close to that of white light. In this paper, we reported the white light emission properties of Dy3+ doped ZrF 4 -BaF 2 -AlF 3 -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. [ABSTRACT FROM AUTHOR]