SYNTHESIS, MORPHOLOGY AND LUMINESCENT PROPERTIES OF RARE EARTH IONS DOPED TUNGSTATE PHOSPHORS FOR PHOTONIC APPLICATIONS

Abstract

In the realm of phosphor materials, the quest for highly efficient luminescent materials continues to drive research efforts. This work report gives a comparative analysis of the influence of different rare earth ions (Dy3+, Sm3+, and Eu3+) on the luminescence properties of tungstate (CaGdSbWO8:CGSW) phosphor material. The rare earth ion doped tungstate phosphors were synthesized by a high-temperature solid-state reaction method and were systematically investigated and compared to understand their crystal structure, band gap, photoluminescence (PL) properties, and Commission International del’Eclairage (CIE).The X-ray diffraction (XRD) data well matched with the JCPDS (PDF#00-064-0231), and confirms the pure phase and crystallinity of the prepared phosphors. The band gap was calculated for the tungstate host doped with Dy3+, Eu3+, and Sm3+ ions using diffuse reflectance spectra (DRS).The PL result shows that Dy3+ can be excited over a broad range from 240to 480nm. Whereas, Eu3+ has an excitation range of 230to 545nm and Sm3+ has a range of 240 to 500nm. Under the 277nm excitation, Dy3+ shows the emission characteristic in the nearly pure white region whereas, Sm3+ shows the emission in the orange-red region when excited by using 273nm wavelength and finally Eu3+ shows the emission in deep-red region after exciting by 275nm wavelength. The CIE chromaticity coordinates of Dy3+, Sm3+ , and Eu3+ ions confirm their emission in individual colour regions. The results obtained from the present study indicate the suitability of tungstate phosphors doped with Dy3+ , Sm3+ , and Eu3+for various visible photonic applications.