Energy transfer between Ce3+ → Gd3+ or Tb3+ in KNaSO4 microphosphor |
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| Authors: | Urvashi Manik S C Gedam S J Dhoble |
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| Affiliation: | 1. Department of Physics, Sardar Patel Mahavidyalaya, Chandrapur, India;2. Department of Physics, K.Z.S. Science College, Nagpur, India;3. Department of Physics, R.T.M. Nagpur University, Nagpur, India |
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| Abstract: | KNaSO4 microphosphor doped with Ce,Gd and Ce,Tb and prepared by a wet chemical method was studied using X‐ray diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence (PL) characterization. KNaSO4 has a 5‐µm particle size detected by SEM. KNaSO4:Ce3+,Tb3+ showed blue and green emission (at 494 nm, 557 nm, 590 nm) of Tb3+ due to 5D4 → 7FJ (J = 4, 5, 6) transitions. KNaSO4:Ce3+,Gd3+ showed luminescence in the ultraviolet (UV) light region at 314 nm for an excitation at 271 nm wavelength. It was observed that efficient energy transfer took place from Ce3+ → Gd3+ and Ce3+ → Tb3+ sublattices indicating that Ce3+ could effectively sensitize Gd3+ or Tb3+ (green emission). Ce3+ emission weakened and Gd3+ or Tb3+ enhanced the emission significantly in KNaSO4. This paper discusses the development and understanding of photoluminescence and the effect of Tb3+ and Gd3+ on KNaSO4:Ce3+. Copyright © 2015 John Wiley & Sons, Ltd. |
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| Keywords: | luminescence phosphor wet chemical method sensitizer and activator energy transfer spectroscopy |
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