INFRARED TO VISIBLE LUMINESCENCE UPCONVERSION BY Yb3+ RE3+ ENERGY TRANSFER IN β' -ALUMINA (RE3+=Er3+, Ho3+, Tm3+) B. VIANA, L. A. MOMODA et B. DUNNJ. Phys. IV France, 01 C7 (1991) C7-411-C7-414DOI: https://doi.org/10.1051/jp4:19917105
