Influence of Eu doping content on photoluminescence of Gd2O3:Eu phosphors prepared by liquid-phase reaction method |
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Authors: | Chung-Sik Park Seung-Seok Choi Sung-Jei Hong Deuk Yong Lee |
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Institution: | a Department of Materials Engineering, Hankuk Aviation University, Goyang 412-791, Republic of Korea b Korea Electronics Technology Institute, Pyungtaek 451-860, Republic of Korea c Department of Materials Engineering, Daelim College of Technology, 526-7, Bisan-Dong, Anyang 431-715, Republic of Korea |
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Abstract: | Europium-doped cubic Gd2O3:Eu3+ nanoparticles containing various activator content in the range of 5-15 wt% were synthesized by a liquid-phase reaction method to investigate the influence of Eu3+ loading on the optical properties of phosphors by using XRD, TEM, BET, spectrometer and fluorometer. The size of Gd2O3:Eu3+ powders was in the range 21-41 nm. The phosphors showed an initial increase in luminescence and then a subsequent decrease with further doping (above 10 wt%). The decay time was reduced with increasing Eu loading; however, it decreased significantly above the 10% Eu doping. From spectroscopic studies, the Eu3+ doping ion distribution was uniform and homogeneous up to the 10 wt% loading because no concentration quenching effect was observed. However, further Eu3+ doping above 10 wt% reduced the luminescence due to the concentration quenching effect, as deduced from the shortening of the decay time. |
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Keywords: | Gadolinium oxide Europium Liquid-phase reaction method Luminescence |
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