Amplified Spontaneous Emission and Lasing in Colloidal Nanoplatelets
Author
Guzelturk, B.
Kelestemur, Y.
Olutas, M.
Delikanli, S.
Demir, Hilmi Volkan
Date
2014-07Source Title
ACS Nano
Print ISSN
1936-0851
Publisher
American Chemical Society
Volume
8
Issue
7
Pages
6599 - 6605
Language
English
Type
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Abstract
Colloidal nanoplatelets (NPLs) have recently emerged as favorable light-emitting materials,
which also show great potential as optical gain media due to their remarkable optical properties. In this work,
we systematically investigate the optical gain performance of CdSe core and CdSe/CdS core/crown NPLs having
different CdS crown size with one- and two-photon absorption pumping. The core/crown NPLs exhibit enhanced
gain performance as compared to the core-only NPLs due to increased absorption cross section and the efficient
interexciton funneling, which is from the CdS crown to the CdSe core. One- and two-photon absorption pumped
amplified spontaneous emission thresholds are found as low as 41 μJ/cm2 and 4.48 mJ/cm2 , respectively. These
thresholds surpass the best reported optical gain performance of the state-of-the-art colloidal nanocrystals
(i.e., quantum dots, nanorods,etc.) emitting in the same spectral range as the NPLs. Moreover, gain coefficient of
the NPLs is measured as high as 650 cm 1 , which is 4-fold larger than the best reported gain coefficient of the
colloidal quantum dots. Finally, we demonstrate a two-photon absorption pumped vertical cavity surface
emitting laser of the NPLs with a lasing threshold as low as 2.49 mJ/cm2 . These excellent results are attributed to the superior properties of the NPLs as optical gain media.
Keywords
Amplified Spontaneous EmissionColloidal nanoplatelets
Vertical cavity surface-emitting Laser
Optical gain