Fischer, StefanStefanFischerSteinkemper, HeikoHeikoSteinkemperLöper, PhilippPhilippLöperHermle, MartinMartinHermleGoldschmidt, Jan ChristophJan ChristophGoldschmidt2022-03-042022-03-042012https://publica.fraunhofer.de/handle/publica/22930910.1063/1.4711126en621530Publisher's Note: "Modeling upconversion of erbium doped microcrystals based on experimentally determined Einstein coefficients" [J. Appl. Phys. 111, 013109 (2012)]journal article