Abstract
We have studied a wide-bandgap oxide semiconductor, , which possesses high crystal field strength and develops deep traps. These traps efficiently store electric charges after excitation with ultraviolet light. Stimulation of trap charges using infrared radiation (both coherent and incoherent) gives wideband emission of in the red–infrared region, which is similar to the photon upconversion process in lanthanides. Under laser excitation, high photon density and local heating pronounce the coupling of and states and causes an excited state crossover of the population from the to state. This expands the emission band-width of up to 900 nm.
© 2016 Optical Society of America
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