physica status solidi (a) · 1976 · 26 citations · 0 references
Natural SciencesMaterials EngineeringMaterials ScienceCrystal StructureElectronic MaterialsOptical MaterialsCrystal ChemistryElectronic Excited StatesFluorescence SpectroscopyLuminescent MaterialsOptical Properties Of SolidsRare-earth-doped MaterialsCrystal Host MaterialsLanthanide LuminescenceLanthanide-doped Upconversion PhosphorsLuminescence MechanismsRare-earth-doped CrystalsRare-earth-doped Luminescent MaterialsStimulated Emission