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In this investigation, we focused on the synthesis and characterization of CsCaF3 compound doped with europium (Eu3+) ions using a solid-state route. To analyze the crystal structure of the synthesized phosphors, X-ray diffraction analysis was employed. Additionally, the doped sample underwent examination of surface morphology and elemental composition through Field Emission Scanning Electron Microscopy and EDAX mapping. The color of the pure and doped CsCaF3 sample was quantified and fitted using Color coordinate graph by the Commission Internationale de l'Eclairage (CIE). The red emission on the doped CsCaF3 compound was detected at 465 nm, which is the transition from 5D0 to 7Fj (j = 0, 1, 2, and 3). The 0.5 mol. % Eu3+ doped CsCaF3 sample was found to have a color purity of 81% and an associated color temperature of 1660 K, indicating its suitability for aesthetic lighting applications. Furthermore, thermoluminescence study, electron paramagnetic resonance (EPR), and effective atomic number (Zeff) calculations were conducted to provide valuable information for potential radiation dosimetry applications.

A potential photocatalytic activity of MoS2-modified g-C3N4 composite for methylene blue (MB) dye degradation is processed under sunlight radiation. The photocatalyst materials (g-C3N4, MoS2, and g-C3N4/MoS2) were prepared by low-temperature hydrothermal method and the synthesized samples were further characterized through the X-ray diffraction (XRD), UV–vis diffuse reflectance spectrometer (DRS), scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDS) and Photoluminescence (PL) spectroscopy techniques. Initially, the formation of the crystalline structure of (g-C3N4, MoS2, and g-C3N4/MoS2) samples was identified through the XRD technique. Further, the morphology of the MoS2-modified g-C3N4 when observed through SEM was found to be a regular structure with minute pores and voids when compared to the other two samples resulting in better light absorption capacity. The elemental composition of synthesized composite is analyzed by XPS spectra. The energy band gap investigated through the DRS spectra was 2.9 eV, 1.8 eV and 1.82 eV for the g-C3N4, MoS2, and g-C3N4/MoS2 samples respectively. Further BET, TOC and scavenger radical analysis was conducted on the tested sample to analyze the degradation process. Thus, the composite photocatalyst material of MoS2-modified g-C3N4 has an enhanced recombination electron-hole pair rate. Finally, the photocatalytic feature of the composite (g-C3N4/MoS2) tested on MB dye solution under sunlight irradiation for 2 hr was found to be successful.