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Control of Spontaneous Emission from Colloidal Quantum Dots in a Polymer Microcavity

Published online by Cambridge University Press:  01 February 2011

Vinod Menon ,
Nikesh Valappil ,
Iosef Zeylikovich ,
Taposh Gayen ,
Bidyut Das  and
Robert R Alfano
Vinod Menon
Affiliation:
[email protected], Queens College - CUNY, Physics, 65-30 Kissena Blvd, Flushing, NY, 11367, United States, 7189973147, 7189973349
Nikesh Valappil
Affiliation:
[email protected], Queens College - CUNY, Physics, 65-30 Kissena Blvd, Flushing, NY, 11367, United States
Iosef Zeylikovich
Affiliation:
[email protected], City College- CUNY, Physics, 138 St & Convent Avenue, New York, NY, 10031, United States
Taposh Gayen
Affiliation:
[email protected], City College- CUNY, Physics, 138 St & Convent Avenue, New York, NY, 10031, United States
Bidyut Das
Affiliation:
[email protected], City College- CUNY, Physics, 138 St & Convent Avenue, New York, NY, 10031, United States
Robert R Alfano
Affiliation:
[email protected], City College- CUNY, Physics, 138 St & Convent Avenue, New York, NY, 10031, United States
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Abstract

We report the fabrication of a one dimensional microcavity structure embedded with colloidal CdSe/ZnS core/shell quantum dots using solution processing. The microcavity structures were fabricated by spin coating alternating layers of polymers of different refractive indices (poly-vinylcarbazole, and poly-acrylic acid) to form the distributed Bragg reflectors (DBRs). Greater than 90% reflectivity was obtained using ten periods of the structure. The one dimensional microcavity was formed by sandwiching a λ/n thick defect layer between two such DBRs. The microcavity demonstrated directionality in emission and well behaved dispersion characteristics. Room temperature time-resolved photoluminescence measurements carried out on this structure showed six fold enhancement of spontaneous emission rate. The photoluminescence decay time of the quantum dots was found to be ∼ 1 ns while for the quantum dots embedded in the microcavity it was ∼150 ps.

Keywords

optoelectronicsolution depositionnanostructure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 959: Symposium M – Quantum Dots—Growth, Behavior and Applications , 2006 , 0959-M10-01
Copyright
Copyright © Materials Research Society 2007

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References

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