Red, green, and blue laser action in solid colloidal quantum dot films

Author

Dang, Cuong ; Roh, Kwangdong ; Lee, Joonhee ; Breen, Craig ; Steckel, J.S. ; Coe-Sullivan, Seth ; Nurmikko, Arto

Author_Institution

Sch. of Eng., Brown Univ., Providence, RI, USA

fYear

2012

Firstpage

1

Lastpage

2

Abstract

We report on wavelength-variable lasing from optical gain media composed of colloidal quantum-dots (CQD) thin films across the visible spectrum. Exploiting single exciton gain enables amplified spontaneous emission (ASE) and vertical cavity lasing at very low optical pump thresholds. The average number of exciton per CQD at the ASE threshold is <;N>;~ 0.8, which significantly reduces losses from enhanced nonradiative multiexciton Auger recombination in nanometer sized semiconductor particle, enabling quasi-continuous-wave CQD laser performance in densely packed nanocomposites.

Keywords

Auger effect; cadmium compounds; colloidal crystals; electron-hole recombination; excitons; nanocomposites; optical pumping; quantum dot lasers; quantum dots; spontaneous emission; thin films; visible spectra; zinc compounds; CdSe-ZnCdS; blue laser action; colloidal quantum dot thin film; densely packed nanocomposite; green laser action; nanometer sized semiconductor particle; nonradiative multiexciton Auger recombination; optical gain media; optical pump threshold; quasi-continuous-wave CQD laser performance; red laser action; single exciton gain; vertical cavity lasing; visible spectrum; wavelength-variable lasing; Epitaxial growth; Optical films; Optical pumping; Radiative recombination; Stimulated emission; Quantum dot; Red green blue laser; Single exciton gain; Vertical cavity laser;

fLanguage

English

Publisher

ieee

Conference_Titel

Nanotechnology (IEEE-NANO), 2012 12th IEEE Conference on

Conference_Location

Birmingham

ISSN

1944-9399

Print_ISBN

978-1-4673-2198-3

Type

conf

DOI

10.1109/NANO.2012.6322195

Filename

6322195