Abstract
We describe results of optical pumping experiments on gallium nitride (GaN) epilayers grown on sapphire and capped with a layer of aluminum gallium nitride (AlGaN). Our samples show the well-known yellow luminescence (in response to exposure with ultraviolet radiation) that derives from transitions to and from defect-induced gap states. We show that it is possible to enhance this downconversion luminescence by subjecting samples to mechanical stress through ultrasonic wave propagation. When double pumped with both ultraviolet and visible blue radiations, the samples generate broadband visible radiation that appears white to the human eye.
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