Title :
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
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;
Conference_Titel :
Nanotechnology (IEEE-NANO), 2012 12th IEEE Conference on
Conference_Location :
Birmingham
Print_ISBN :
978-1-4673-2198-3
DOI :
10.1109/NANO.2012.6322195
