Synthesis and optical characterization of Ca2PO4Cl:Tb3+ and Mn2+ phosphor for solid state lighting
1N.H.College, Bramhapuri, Gondwana University, Gadchiroli 441205, India
2Department of Applied Physics, Namdeorao Poreddiwar College of Engineering & Technology, Gadchiroli 442605, India
3Department of Physics, RTM Nagpur University, Nagpur 440033, India
Adv. Mater. Lett., 2015, 6 (7), pp 616-619
Publication Date (Web): Jul 12, 2015
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In present work we studied the luminescence properties of Tb3+ and Mn2+ doped Ca2PO4Cl phosphor synthesized by wet chemical method were studied with extra heat treatment, to understand the mechanism of excitation and the corresponding emission of prepared phosphor. For the green emission, Tb3+ ion is used as an activator, the excitation and emission spectra indicate that this phosphor can be effectively excited by 380 nm, to exhibit bright green emission centered at 545 nm corresponding to the f→f transition of Tb3+ ions. The emission spectrum of Mn2+ ion at 405 nm excitation 4T1(4G) - 6A1(6S) gives an emission band at 591 nm (orange-red). The observed photoluminescence (PL) measurements of Tb3+ and Mn2+ activated prepared phosphor indicates that these are the outstanding green and orange-red emitting potential phosphor , suitable application for the solid state lighting. The synthesized phosphors were analyzed by X-ray diffraction (XRD) for confirmation of phase and purity. The morphology and structure were characterized by scanning electron microscopy. Thus the phosphors in this system may be chosen as the green component for the tri-color lamp and certainly applied in w-UV LEDs. In the view of the excitation band and excellent luminescent properties, Ca2PO4Cl:Tb3+ and Mn2+ phosphor is expected to be a potential candidate for application in n-UV white LEDs and solid-state lighting because of its cost-efficient manufacturing, mercury-free excitation and eco-friendly characteristics.
Wet chemical method, solid state lighting, photoluminescence, XRD, SEM.