Phosphates are inorganic complex compositions which finds applications in the field of light emitting devices , charge storage devices etc, due to their high thermal stability, relatively low sintering temperature, strong optical absorption, flexible compositions and less hygroscopic nature[1,2]. Yavapaiite structured SrTi(PO4)2 belongs to the double monophosphate family having general formula AIIBIV(PO4)2 ( A= Cd, Ca and Sr; B= Zr, Sn, Mo and Ti) get extensively studied for their applications in dielectric materials, catalysts and ionic conductors [3,4]. &Bull; Here we select Eu3+ as an activator ion to produce orange-red emission owing to its 5D0→ 7FJ (0, 1, 2, 3 and 4) transitions. &Bull; Eu3+ incorporated red phosphors are widely used in white LED, display devices, forensic applications etc.
The structural and photoluminescence studies of a series of Sr2Ca(1-x)TeO6:xEu3+ phosphors synthesized through solid state reaction method were investigated in this work. The phosphor exhibits needle-like morphology which is advantageous for its use in photovoltaic cells and lighting applications. On exciting Sr2CaTeO6: Eu3+ phosphors with blue light (λ= 464 nm), the phosphors exhibit bright red emission at 615 nm, which corresponds to the transition of Eu3+ in Sr2CaTeO6 host, originating from 5D0→7F2 electric dipole transition. The optimum concentration of Eu3+ in this host is found to be 0.04 mol and the concentration quenching phenomenon is attributed due to dipole-dipole interaction of neighbouring Eu3+ ions. The calculated CIE coordinates of the prepared phosphors are similar to the NTSC red phosphor and commercial red phosphors. These results suggest that the Sr2CaTeO6:Eu3+ phosphors are potential candidate to incorporate in WLEDs as an excellent red emitting phosphor.
Self-luminescent BaMg2V2O8 and Sm3+ doped BaMg2V2O8 phosphors have been obtained by high temperature solid state reaction method. Detailed Structural and optical analysis were carried out and compare the result of pure and Sm doped samples for checking the suitability in various photonic applications. Broad emission band centered at 516 nm of BaMg2V2O8 , under near UV excitation arises due to 3T1→1A1 and 3T2→2A1 transition of (VO4) 3- and gives blue- green emission. Incorporation Sm3+ in to the luminescent host lattice leads to the enhancement of the emission intensity and color tuning ability of the host. The CIE chromaticity coordinates for BaMg2V2O8 gives a blue green emission following the coordinates (x, y) as (0.29, 0.43) and for Sm3+ doped BaMg2V2O8 show the yellow emission following the coordinates (x, y) as (0.36, 0.41).
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