Spectroscopic behavior, thermal stability and temperature sensitivity of Ca2SiO4: Eu3+ red emitting phosphor for solid state lighting application

This paper reports the spectroscopic behavior, thermal stability and temperature sensitivity of Ca2SiO4: Eu3+ phosphors. A series of Ca2SiO4: Eu3+ phosphors were synthesized by using an efficient combustion method. The X-ray diffraction (XRD) results showed that the prepared phosphors consist of a single phase orthorhombic structure. The field emission scanning electron microscope (FESEM) results showed irregular and agglomeration of particles. Under the excitation wavelength 255 nm, the PL emission showed five peaks at the wavelengths 574, 594, 612, 656 and 707 nm corresponds to the transitions D-5(0) -> F-7(0), D-5(0) -> F-7(1), D-5(0) -> F-7(2), D-5(0) -> F-7(3), and D-5(0) -> F-7(4) respectively. The concentration quenching phenomenon was ascribed to dipole-dipole interaction. The intensity and spectral parameters for different J levels were estimated using the Judd-Ofelt theory. The prepared phosphor has retained the emission intensity about 70% at 475 K. The CIE chromaticity coordinates (x, y) were calculated from emission spectra and found to be in the red region. (C) 2018 Elsevier B.V. All rights reserved.