title: Luminescence properties of barium--gadolinium-titanate ceramics doped with rare-earth ions (Eu3+ and Tb3+).
abstract: Barium-gadolinium-titanate (BaGd2 Ti4 O12) powder ceramics doped with rare-earth ions (Eu(3+) and Tb(3+)) were synthesized by a solid-state reaction method. From the X-ray diffraction spectrum, it was observed that Eu(3+) and Tb(3+):BaGd2 Ti4 O12 powder ceramics are crystallized in the form of an orthorhombic structure. Scanning electron microscopy image shows that the particles are agglomerated and the particle size is about 200 nm. Eu(3+) - and Tb(3+) -doped BaGd2 Ti4 O12 powder ceramics were examined by energy dispersive X-ray analysis, Fourier transform infrared spectroscopy, photoluminescence and thermoluminescence (TL) spectra. Emission spectra of Eu(3+)-doped BaGd2 Ti4 O12 powder ceramics showed bright red emission at 613 nm ((5)D0 →(7)F2) with an excitation wavelength λ(exci)  = 408 nm ((7)F0 → (5)D3) and Tb(3+):BaGd2 Ti4 O12 ceramic powder has shown green emission at 534 nm ((5)D4 → (7)F5) with an excitation wavelength λ(exci)  = 331 nm (((7)F6 → (5)D1). TL spectra show that Eu(3+) and Tb(3+) ions affect TL sensitivity.
authors.affiliation: Department of Physics, Sri Venkateswara Degree College, Kadapa, 516003, India.
authors.forename: S
authors.initials: S
authors.lastname: Hemasundara Raju
authors.forename: B
authors.initials: B
authors.lastname: Muni Sudhakar
authors.forename: B
authors.initials: B
authors.lastname: Sudhakar Reddy
authors.forename: S J
authors.initials: SJ
authors.lastname: Dhoble
authors.forename: K
authors.initials: K
authors.lastname: Thyagarajan
authors.forename: C
authors.initials: C
authors.lastname: Nageswara Raju
mesh_terms: D001464:Barium / Q000737:chemistry; D002516:Ceramics / Q000737:chemistry*; D005063:Europium / Q000737:chemistry*; D005682:Gadolinium / Q000737:chemistry; D007477:Ions / Q000737:chemistry; D049449:Luminescence; D049408:Luminescent Agents / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry; D010316:Particle Size; D013499:Surface Properties; D013725:Terbium / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry
chemical_list: D007477:Ions; D049408:Luminescent Agents; D013725:Terbium; D001464:Barium; D005063:Europium; D005682:Gadolinium; D014025:Titanium; D010100:Oxygen
keywords: FTIR; emission; excitation; grain size; optical properties