Jeong JY, Kim JH.  Structure and Photoluminescence of Optically Transparent Y₂O₃:Eu Thin Films Prepared on Sapphire Substrates by RF Magnetron Sputtering.  Applied Science and Convergence Technology 2021;30:34-37.  
https://doi.org/10.5757/ASCT.2021.30.1.34