Abstract

Infrared-to-visible upconverted luminescent spectra of Er³⁺ and La³⁺ codoped Y₂O₃ powders are investigated. By introducing La³⁺ ions, the upconversion green radiation is found to be greatly enhanced when compared with the powders with La³⁺ absent. Such enhancement can be attributed to the modification of the local symmetry surrounding the Er³⁺ ion, which benefits the intra-4f transitions of Er³⁺ ion, and the decreasing interaction between Er³⁺ ions, which suppresses the energy transfer process F_7/24+I4_11/2→F4_9/2+F4_9/2.

© 2015 Chinese Laser Press

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