inorganics Article Influence of Ga Substitution on the Local Structure and Luminescent Properties of Eu-Doped CaYAlO4 Phosphors Ju Hyun Oh 1, Hyunwoo Kim 1, Mijeong Kang 2 and Seunghun Lee 1,* 1 Department of Physics, Pukyong National University, Busan 48513, Republic of Korea; juhyun@pknu...