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Insights into structural and spectroscopic characterization of Sm^(3+)doped orange rich red emitting CsMgPO_(4)phosphors

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Journal of Rare Earths 2022年第12期40卷 1837-1848,I0001页

作者： M.K.Pradhan S.Dash Department of Physics and Astronomy National Institute of Technology RourkelaRourkela769008OdishaIndia

In the present study,Sm^(3+)activated inorganic orthophosphate CsMgPO_(4)(CSMP)phosphors were prepared by adopting a solid-state reaction *** structural phase purity and morphological features were studied by X-ray powder diffraction(XRD)and scanning electron microscopy(SEM),*** molecular structure and vibrational modes were substantiated with the Fourier transform infrared spectroscopy(FTIR)and Raman spectroscopy *** optical bandgap of the host and Sm^(3+)doped phosphors was deduced from the diffused reflectance(DR)spectra with a typical value of 5.72 eV and a small variation is observed with increasing concentrations.A systematic study of photoluminescence(PL)properties of Sm^(3+)doped CSMP phosphors was carried *** the room temperature excitation and emission spectra,it is found that the phosphor emits in the orange rich red light under the suitable excitation of 402 nm in the UV region and concentration quenching occurs at x=0.02 doping *** emission peaks observed at around 562,598 and 644 nm confirm the characteristic Sm^(3+)4 f-4 f *** temperature-dependent photoluminescence(TD-PL)of the x=0.02(optimum doping)is recorded from 30 to 210℃,showing good thermal stability even at 150℃.The thermal quenching mechanisms are discussed based on the configuration coordinate model of excitation and *** prepared phosphors are found to exhibit near thermal stability compared to the commercially available red *** decay time and quantum efficiency were *** colour coordinates are found to lie in the orangish-red region of the colour *** the prepared phosphors CSMP:x Sm^(3+)can be useful as a red component in designing UV excitable chip-based phosphor-converted white LED applications.

关键词： Charge compensation Red phosphors Thermal stability configuration coordinate model Luminescence Rare earths

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