"Nomura, K.,Umezawa, M.,Tezuka, K.,Tasaki, T.,Okubo, K,Soga, K.","Effect of polarization of surrounding organic molecules on upconversion emission of ƒÀ-NaYF4 Co-Doped with Er3+ and Yb3+",,"Journal of Luminescence",,"Vol. 239",,"pp. 118394",2021,Aug.