Upconversion and energy transfer modeling in Er, Yb : CaYAlO4 B. ZANDI, L.D. MERKLE, J.A. HUTCHINSON, H.R. VERDUN et B.H.T. CHAI J. Phys. IV France, 04 C4 (1994) C4-587-C4-590 DOI: 10.1051/jp4:19944141