Visible red random lasing in Y2O3:Eu3+/ZnO polycrystalline thin films by energy transfer from ZnO films to Eu3+

Chong, M. K.; Abiyasa, A. P.; Pita, K.; Yu, S. F.
October 2008
Applied Physics Letters;10/13/2008, Vol. 93 Issue 15, p151105
Academic Journal
Visible red random lasing centered at ∼611 nm has been observed in Y2O3:Eu3+/ZnO films at room temperature. Using a 355 nm laser source to excite the ZnO films, ultraviolet (UV) random lasing has been observed. The UV lasing spectrum can be tuned to overlap strongly with the 7F0-5L6 excitation spectrum of Eu3+ ions centered at ∼394 nm by controlling the pump power, leading to very efficient radiative energy transfer from the ZnO films to Eu3+ ions. As a result, a red random lasing centered at ∼611 nm corresponding to the 5D0-7F2 transition of Eu3+ ions was observed.


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