Investigation of UV-emitting Gd(3+)-doped LiCaBO3 phosphor.
Incorporating the Gd(3+) rare earth ion in the LiCaBO3 host lattice resulted in narrow-band UV-B emission peaking at 315 nm, with excitation at 274 nm. The LiCaBO3:Gd(3+) phosphor was synthesized via the solid-state diffusion method. The structural, morphological and luminescence properties of this phosphor were characterized by X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM) and photoluminescence (PL) spectroscopy. Electron paramagnetic resonance (EPR) characterization of the as-prepared phosphors is also reported here. XRD studies confirmed the crystal formation and phase purity of the prepared phosphors. A series of different dopant concentrations was synthesized and the concentration-quenching effect was studied. Critical energy transfer distance between activator ions was determined and the mechanism governing the concentration quenching is also reported in this paper.
Department of Physics, R.T.M. Nagpur University, Nagpur, -440033, India.
Sumedha
S
Tamboli
Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, 400 085, India.
B
B
Rajeswari
Department of Physics, R.T.M. Nagpur University, Nagpur, -440033, India.
S J
SJ
Dhoble
D001895:Boron / Q000737:chemistry*; D002118:Calcium / Q000737:chemistry*; D005682:Gadolinium / Q000737:chemistry*; D008094:Lithium / Q000737:chemistry*; D049449:Luminescence; D010100:Oxygen / Q000737:chemistry*; D014466:Ultraviolet Rays; D014961:X-Ray Diffraction
D008094:Lithium; D005682:Gadolinium; D001895:Boron; D010100:Oxygen; D002118:Calcium
Gd3+ rare-earth ion; UV-B range; electron paramagnetic resonance; photoluminescence