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http://dx.doi.org/10.4191/kcers.2018.55.5.09

Aerosol Synthesis of Gd2O3:Eu/Bi Nanophosphor for Preparation of Photofunctional Pearl Pigment as Security Material  

Jung, Kyeong Youl (Department of Chemical Engineering, Kongju National University)
Han, Jang Hoon (Department of Chemical Engineering, Kongju National University)
Kim, Dae Sung (Eco-composite Materials Center, Korea Institute of Ceramic Engineering and Technology (KICET))
Choi, Byung-Ki (CQV Co., Ltd)
Kang, Wkang-Jung (CQV Co., Ltd)
Publication Information
Journal of the Korean Ceramic Society / v.55, no.5, 2018 , pp. 461-472 More about this Journal
Abstract
$Gd_2O_3:Eu/Bi$ nanoparticles were synthesized via spray pyrolysis and applied for the preparation of a luminescent pearl pigment as an anti-counterfeiting material. The luminescence properties were optimized by changing the $Eu^{3+}$ and $Bi^{3+}$ concentration. Ethylene glycol was used as an organic additive to prepare the $Gd_2O_3:Eu/Bi$ nanoparticles. The highest emission intensity was achieved when the total dopant content was 10.0 at.% and the mole fraction of Bi was 0.1. The concentration quenching was mainly due to dipole-dipole interactions between the same activators, and the critical distances were 9.0 and $19.6{\AA}$ for $Eu^{3+}$ and $Bi^{3+}$, respectively. The prepared $Gd_2O_3:Eu/Bi$ powder exhibited an average size of approximately 82.5 nm and a narrow size distribution. Finally, the $Gd_2O_3:Eu/Bi$ nanophosphor coated on the surface of the pearl pigment was confirmed to have good red emission under irradiation from a portable ultraviolet light-emitting diode lamp (365 nm).
Keywords
Spray pyrolysis; Nanophosphor; Pearl pigment; Anti-counterfeiting;
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