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

DOI: 10.5185/amlett.2015.SMS3

Publication Date (Web): Jul 12, 2015

Copyright © IAAM-VBRI Press

E-mail: drns.kokode@gmail.com

Abstract

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.

Keywords

Wet chemical method, solid state lighting, photoluminescence, XRD, SEM.