Abstract
Sputter-deposited thin-film amorphous () emits at 554 and as a result of and transitions. () gives a weak emission peak at as a result of . The codoping of Er and Yb in AlN results in energy transfer from to and enhances the emissions by an order of magnitude. Transfer of electrons occurs from the state of to the state of . The weak emission from , when excited by a laser in the absence of , confirms that the luminescence enhancement in ytterbium is due to energy transfer and not to direct green light excitation by the erbium emission. A possibility of population inversion and a four-level laser cavity formation exists in the system.
© 2010 Optical Society of America
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