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Since the seminal observation of room-temperature laser emission from ZnOthin films and nanowires, numerous attempts have been carried out for detailedunderstanding of the lasing mechanism in ZnO. In spite of the extensive effortsperformed over the last decades, the origin of optical gain at room temperatureis still a matter of considerable discussion,. We show that ZnO microcrystalswith a size of a few micrometers exhibit purely excitonic lasing at roomtemperature without showing any symptoms of electron-hole plasma emission. Wethen present the distinct experimental evidence that the room-temperatureexcitonic lasing is achieved not by exciton-exciton scattering, as has beengenerally believed, but by exciton-electron scattering. As the temperature islowered below ~150 K, the lasing mechanism is shifted from the exciton-electronscattering to the exciton-exciton scattering. We also argue that the ease ofcarrier diffusion plays a significant role in showing room-temperatureexcitonic lasing.

physical review. b./physical review. b

Experimental realization of purely excitonic lasing in ZnO microcrystals  at room temperature: transition from exciton-exciton to exciton-electron  scattering