Highly efficient, spatially coherent distributed feedback lasers from dense colloidal quantum dot films
Steekel, Jonathan S.
Date of Issue2013
School of Electrical and Electronic Engineering
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%.
DRNTU::Engineering::Electrical and electronic engineering
Applied physics letters
© 2013 AIP Publishing LLC. This is the author created version of a work that has been peer reviewed and accepted for publication by Applied Physics Letters, AIP Publishing LLC. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1063/1.4826147].