Unraveling the ultralow threshold stimulated emission from CdZnS/ZnS quantum dot and enabling high ‐ Q microlasers
Author(s)
Date
2015Source Title
Laser and Photonics Reviews
Print ISSN
1863-8880
Publisher
Wiley-VCH Verlag
Volume
9
Issue
5
Pages
507 - 516
Language
English
Type
ArticleItem Usage Stats
251
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views
315
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Abstract
The newly engineered ternary CdZnS/ZnS colloidal quantum dots (CQDs) are found to exhibit remarkably high photoluminescence quantum yield and excellent optical gain properties. However, the underlying mechanisms, which could offer the guidelines for devising CQDs for optimized photonic devices, remain undisclosed. In this work, through comprehensive steady-state and time-resolved spectroscopy studies on a series of CdZnS-based CQDs, we unambiguously clarify that CdZnS-based CQDs are inherently superior optical gain media in the blue spectral range due to the slow Auger process and that the ultralow threshold stimulated emission is enabled by surface/interface engineering. Furthermore, external cavity-free high-Q quasitoroid microlasers were produced from self-assembly of CdZnS/ZnS CQDs by facile inkjet printing technique. Detailed spectroscopy analysis confirms the whispering gallery mode lasing mechanism of the quasitoroid microlasers. This tempting microlaser fabrication method should be applicable to other solution-processed gain materials, which could trigger broad research interests. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA.
Keywords
Auger recombinationCdZnS/ZnS quantum dots
Multiphoton excitation
Stimulated emission
Toroid laser
Augers
Ink jet printing
Laser excitation
Laser spectroscopy
Multiphoton processes
Nanocrystals
Neodymium lasers
Optical emission spectroscopy
Optical gain
Optical properties
Photonic devices
Self assembly
Semiconductor quantum dots
Stimulated emission
Whispering gallery modes
Auger recombination
Colloidal quantum dots
Multiphoton excitation
Optical gain properties
Photoluminescence quantum yields
Time-resolved spectroscopy
Ultra - low threshold
Whispering - gallery - mode lasing
Quantum dot lasers
Permalink
http://hdl.handle.net/11693/23436Published Version (Please cite this version)
http://dx.doi.org/10.1002/lpor.201500063Collections
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