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Controlled Preparation of Red-Light-Emitting (Y_0.95Eu_0.05)₂O₃ Phosphors and Vacuum Sintering of Transparent (Y_0.95Eu_0.05)₂O₃ Ceramics

B. Lu, B. Lu, B. Lu, H.M. Cheng, H.M. Cheng, H.M. Cheng, Z.G. Sun, L. Wang, J.G. Pan, J.G. Pan, J.G. Pan, H.B. Chen, H.B. Chen, H.B. Chen

Journal of Ceramic Science and Technology, Vol. 9, No. 1 (2018), pp. 53-60

DOI: 10.4416/JCST2017-00066

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Abstract

A facile co-precipitation technique was employed for preparing well-dispersed (Y0.95Eu0.05)2O3 phosphors using ammonium hydrogen carbonate (AHC) as the precipitant, followed by vacuum sintering at the relatively low temperature of 1700 °C for 4 h to produce transparent (Y0.95Eu0.05)2O3 ceramics. The transparent (Y0.95Eu0.05)2O3 ceramic, with fine grain sizes of 12 – 14 μm, has a substantially smaller bandgap (∼ 4.45 eV) than the corresponding phosphor. Both the oxide powder and the transparent ceramic exhibit the typical 5D0→7F2 transition at ∼ 613 nm, corresponding to the Eu3+ emission upon UV excitation into the charge transfer (CT) band arising from the electronic transition from the 2p orbital of O2- to the 4f orbital of Eu3+. The light output of the sintered bodies can be significantly improved with heat treatment, which results in much higher outputs compared with commercial single-crystal CdWO4. High-temperature densification and post-annealing processes significantly improved the photoluminescence/photoluminescence excitation (PL/PLE) intensities and external quantum efficiencies, and also led to shorter fluorescence lifetimes of the samples.

Keywords

Transparent ceramics, phosphor, yttria, optical property, Eu3+ doping

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