Exciton related stimulated emission in ZnO polycrystalline thin film deposited by filtered cathodic vacuum arc technique
- Institute of Materials Research and Engineering, 3 Research Link, Singapore 117602 (Singapore)
Random lasing was observed from ZnO polycrystalline thin film deposited by filtered cathodic vacuum arc technique. It is found that the random lasing action results from exciton-exciton scattering process when the excitation intensity is low. However, with increasing excitation intensity, the well-resolved discrete lasing modes evolve into broad stimulated emission band due to electron-hole plasma formation when the photogenerated exciton density exceeds the Mott density. The short spontaneous emission decay time measured at low temperature suggests that the radiative recombination rate is enhanced by the nanosized ZnO grains in the polycrystalline film through exciton-light coupling.
- OSTI ID:
- 20779287
- Journal Information:
- Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 19 Vol. 88; ISSN APPLAB; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
Similar Records
Surface-emitting stimulated emission in high-quality ZnO thin films
Laser-Like Emission From Highly Scattering ZnO Nanoparticle Films
Surface excitons on a ZnO (000-1) thin film
Journal Article
·
Fri Oct 01 00:00:00 EDT 2004
· Journal of Applied Physics
·
OSTI ID:20662078
Laser-Like Emission From Highly Scattering ZnO Nanoparticle Films
Journal Article
·
Sun Sep 27 00:00:00 EDT 2009
· AIP Conference Proceedings
·
OSTI ID:21322929
Surface excitons on a ZnO (000-1) thin film
Journal Article
·
Sun Nov 03 23:00:00 EST 2013
· Applied Physics Letters
·
OSTI ID:22254104