Random Lasing with Systematic Threshold Behavior in Films of CdSe/CdS Core/Thick-Shell Colloidal Quantum Dots

Beitrag in einer Fachzeitschrift
(Online-Publikation)


Details zur Publikation

Autorinnen und Autoren: Gollner C, Ziegler J, Protesescu L, Dirin DN, Lechner RT, Fritz-Popovski G, Sytnyk M, Yakunin S, Rotter S, Amin AAY, Vidal C, Hrelescu C, Klar TA, Kovalenko MV, Heiß W
Zeitschrift: Acs Nano
Verlag: American Chemical Society
Jahr der Veröffentlichung: 2015
Band: 9
Heftnummer: 10
Seitenbereich: 9792-9801
ISSN: 1936-0851
Sprache: Englisch


Abstract


While over the past years the syntheses of colloidal quantum dots (CQDs) with core/shell structures were continuously improved to obtain highly efficient emission, it has remained a challenge to use them as active materials in laser devices. Here, we report random lasing at room temperature in films of CdSe/CdS CQDs with different core/shell band alignments and extra thick shells. Even though the lasing process is based on random scattering, we find systematic dependencies of the laser thresholds on morphology and laser spot size. To minimize laser thresholds, optimizing the film-forming properties of the CQDs, proven by small-angle X-ray scattering, was found to be more important than the optical parameters of the CQDs, such as biexciton lifetime and binding energy or fluorescence decay time. Furthermore, the observed systematic behavior turned out to be highly reproducible after storing the samples in air for more than 1 year. These highly reproducible systematic dependencies suggest that random lasing experiments are a valuable tool for testing nanocrystal materials, providing a direct and simple feedback for further development of colloidal gain materials toward lasing in continuous wave operation. © 2015 American Chemical Society.



FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Heiß, Wolfgang Prof. Dr.
Professur für Werkstoffwissenschaften (lösungsprozessierte Halbleitermaterialien)


Zusätzliche Organisationseinheit(en)
Energie-Campus Nürnberg (EnCN)


Einrichtungen weiterer Autorinnen und Autoren

Eidgenössische Technische Hochschule Zürich (ETHZ) / Swiss Federal Institute of Technology in Zurich
Energie Campus Nürnberg
Johannes Kepler Universität (JKU) Linz
Montanuniversität Leoben
Vienna University of Technology


Zitierweisen

APA:
Gollner, C., Ziegler, J., Protesescu, L., Dirin, D.N., Lechner, R.T., Fritz-Popovski, G.,... Heiß, W. (2015). Random Lasing with Systematic Threshold Behavior in Films of CdSe/CdS Core/Thick-Shell Colloidal Quantum Dots. Acs Nano, 9(10), 9792-9801. https://dx.doi.org/10.1021/acsnano.5b02739

MLA:
Gollner, Claudia, et al. "Random Lasing with Systematic Threshold Behavior in Films of CdSe/CdS Core/Thick-Shell Colloidal Quantum Dots." Acs Nano 9.10 (2015): 9792-9801.

BibTeX: 

Zuletzt aktualisiert 2018-25-10 um 12:04