Tunable luminescence properties and energy transfer in LaAl11O18:Eu,Tb phosphor |
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| Authors: | M S Mendhe S P Puppalwar S J Dhoble |
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| Affiliation: | 1. Department of Physics, Kamla Nehru Mahavidyalaya, Nagpur, India;2. Department of Physics, RTM Nagpur University, Nagpur, India |
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| Abstract: | Eu2+ and Tb3+ singly doped and co‐doped LaAl11O18 phosphors were prepared by a combustion method using urea as a fuel. The phase structure and photoluminescence (PL) properties of the prepared phosphors were characterized by powder X‐ray diffraction (XRD), scanning electron microscopy (SEM), and photoluminescence excitation and emission spectra. When the content of Eu2+ was fixed at 0.01, the emission chromaticity coordinates could be adjusted from blue to green region by tuning the contents of Tb3+ ions from 0.01 to 0.03 through an energy transfer (ET) process. The fluorescence data collected from the samples with different contents of Tb3+ into LaAl11O18: Eu, show the enhanced green emission at 545 nm associated with 5D4 –7F5 transitions of Tb3+. The enhancement was attributed to ET from Eu2+ to Tb3+, and therefore Eu2+ ion acts as a sensitizer (an energy donor) while Tb3+ ion as an activator. The ET from Eu2+ to Tb3+ is performed through dipole–dipole interaction. The ET efficiency and critical distance were also calculated. The present Eu2+–Tb3+ co‐doped LaAl11O18 phosphor will have potential application for UV convertible white light‐emitting diodes. Copyright © 2015 John Wiley & Sons, Ltd. |
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| Keywords: | LaAl11O18: Eu2+ Tb3+ XRD SEM photoluminescence energy transfer |
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