UV Emission of ZnO Structures with Whispering Gallery Modes Synthesized by Different Methods

abstract-ZnO laser microstructures with whispering gallery modes synthesized by different methods were studied. The main contribution to room-temperature optical gain was shown to be from scattering processes of electron-hole pairs rather than direct recombination in an inverted electron-hole plasma. It was found that the bandgap energy and the nature of luminescence do not depend significantly on the specific synthesis method.