The occurrence of energy-transfer upconversion (ETU) between two neighboring rare-earth ions depends on their excitation to the starting energy levels of the ETU process [1]. If both ions are of the same type and the two starting levels of the ETU process are the same, one expects the rate of ETU to be a quadratic function of the population density of this starting level. This quadratic dependency can be tested experimentally by measuring, upon the same pump conditions, the luminescence-decay curves of direct emission from the metastable electronic state, in which ETU originates, and of upconversion luminescence emitted from a higher-energy electronic state that is populated by the ETU process [2].

© 2019 IEEE

PDF Article


You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
Login to access OSA Member Subscription