Young-Jae Cho, Takashi Hirakawa, Kazuo Sakiyama, Hiroaki Okamoto and Yoshihiro Hamakawa, “EL/PL Hybrid Device Enhanced by UV Emission from ZnF2:Gd Thin Film Electroluminescence,” 8th Seoul International Symposium on the Physics of Semiconductors and Applications (ISPSA’96), Seoul, Korea, pp.21–22 (Oct., 1996).