Highly efficient, spatially coherent distributed feedback lasers from dense colloidal quantum dot films

Highly efficient, spatially coherent distributed feedback lasers from dense colloidal quantum dot films

Colloidal quantum dots (CQD) are now making their entry to full-color displays, endowed by their brightness and single-material base. By contrast, many obstacles have been encountered in their use towards lasers. We demonstrate here optically pumped distributed feedback (DFB) lasers, based on close-...

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Bibliographic Details
Main Authors: Dang, Cuong, Lee, Joonhee, Roh, Kwangdong, Kim, Hanbit, Ahn, Sungmo, Jeon, Heonsu, Breen, Craig, Steekel, Jonathan S., Coe-Sullivan, Seth, Nurmikko, Arto
Other Authors: School of Electrical and Electronic Engineering
Format: Article
Language:English
Published: 2014
Subjects:
DRNTU::Engineering::Electrical and electronic engineering
Online Access:https://hdl.handle.net/10356/79635
http://hdl.handle.net/10220/19581
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Institution: Nanyang Technological University
Language: English
Description
Summary:Colloidal quantum dots (CQD) are now making their entry to full-color displays, endowed by their brightness and single-material base. By contrast, many obstacles have been encountered in their use towards lasers. We demonstrate here optically pumped distributed feedback (DFB) lasers, based on close-packed, solid films self-assembled from type-I CQDs. Notably, the single mode CQD-DFB lasers could reach such a low threshold as to be pumpable with a compact pulsed source in a quasi-continuous wave regime. Our results show the spatially and temporally coherent laser beam outputs with power of 400 μW and a quantum efficiency of 32%.

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