1. Laser-Like Emission From Highly Scattering ZnO Nanoparticle Films.
- Author
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Stassinopoulos, A., Tsagarakis, E. D., Das, R. N., Giannelis, E. P., Anastasiadis, S. H., and Anglos, D.
- Subjects
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NANOPARTICLES , *ZINC oxide , *POLYETHYLENE terephthalate , *ANNEALING of metals , *PHOTOLUMINESCENCE - Abstract
A convenient and straightforward way to fabricate random lasing films based on ZnO is proposed. Highly scattering films consisting of ZnO nanoparticles are fabricated following a two-stage process that involves a) spin-coating of aqueous ZnO nanoparticle dispersions on rigid (glass) or flexible (polyethylene terephthalate) substrates and b) subsequent surface modification by means of a controlled UV laser annealing processing. Upon excitation with 150 picosecond pulses at 355 nm, the films exhibit intense photoluminescence emission, which upon crossing a threshold pump energy density, develops laser-like characteristics, namely, gain amplification, spectral narrowing and, under optimum pump conditions and sample structure, distinct lasing modes. [ABSTRACT FROM AUTHOR]
- Published
- 2009
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