조운조 김명욱 김상혁 조재철 최상삼 2024-01-21T18:37:22Z 2024-01-21T18:37:22Z 2022-01-10 1997-03 https://pubs.kist.re.kr/handle/201004/143917 Bi-directional energy transfer process in Er3+-Tm3+-codoped fluorozirconate glasses Article 3 Journal of the optical society of Korea, v.1, no.1, pp.5 - 9 Journal of the optical society of Korea 1 1 5 9 fluorozironate glass green emission intensity energy transfer direction