Blue, green, and red upconversion emission from lanthanide-doped LuPO4 and YbPO4 nanocrystals in a transparent colloidal solution

Angewandte Chemie International Edition (2003) - Comments
pubmed: 12866112 doi: 10.1002/anie.200351091 issn: 1433-7851 issn: 1521-3773

Stephan Heer, Olaf Lehmann, Markus Haase, Hans-Ulrich Güdel