Infrared to blue upconversion fluorescence in heavy metal fluoride glass codoped with Tm3 and Yb3 ions
Journal of Physics and Chemistry of Solids, Vol. 55, No. 8, Ağustos 1994, s. 677-682, ISSN: 00223697
KERMAOUI A,ÖZEN GÖNÜL,GOLDNER PH,DENİS JP,PELLE F