Fluorescence lifetime and Judd–Ofelt parameters of Eu3+ doped SrBPO5

• Published in: Physica. B, Condensed matter Vol. 410; pp. 141 - 146
• Main Authors: Kumar, Mithlesh, Seshagiri, T.K., Godbole, S.V.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 01.02.2013; Elsevier
• Subjects: Color coordinates; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Judd–Ofelt intensity parameters; Life time decay; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Other solid inorganic materials; Photoluminescence; Physics; SrBPO5:Eu3+phosphor; Judd–Ofelt intensity parameters; SrBPO5:Eu3+phosphor; Life time decay; Color coordinates; Photoluminescence; SrBPO; Doping; Fluorescence; Judd-Ofelt theory; Strontium borophosphate; phosphor; XRD; Time resolved spectra; Luminescence decay; Covalent bonds; Eu; Europium additions; Energy-level transitions; Judd-Ofelt intensity parameters; Asymmetry; Phosphors; Chromaticity
• ISSN: 0921-4526; 1873-2135
• DOI: 10.1016/j.physb.2012.10.040

Synthesis, X-ray diffraction and photoluminescence investigations of Eu3+-doped SrBPO5 phosphor has been carried out in order to characterize the material. PL emission spectrum of air heated SrBPO5:Eu3+ phosphor exhibits bands at 590, 614, 651 and 702nm under 238nm excitation, assigned to the 5D0→7FJ (J=1, 2, 3, 4) transitions of Eu3+ ions. Of these transitions, the emission centered at 614nm is the most prominent. Photoluminescence decay time and Time-resolved emission spectrometric (TRES) studies of Eu3+ were carried out with λem=614nm and λex=238nm. It suggested that Eu3+ ions are present at two different sites and predominantly occupying Sr2+ sites in the host lattice. Judd–Ofelt intensity parameters and other radiative properties were evaluated from the emission spectrum by adopting standard procedure. The trend observed in the J–O parameters (Ω2>Ω4) confirms the covalency exiting between the Eu3+ ion and ligands as well as the asymmetry around the metal ion site. The color coordinates of the system were evaluated (x=0.558 and y=0.355) and plotted on a standard CIE index diagram. The observations showed that the SrBPO5:Eu3+ phosphor is very close to the red emission material. Photoluminescence intensity was compared with that of a commercial red phosphor for commercial utility purpose. It is observed that, the photoluminescence intensity of the prepared phosphor was 60% as compared to the commercial phosphor Y2O3: Eu.