title: Room-temperature amplified spontaneous emission at 1300 nm in solution-processed PbS quantum-dot films.
abstract: We report room-temperature amplified spontaneous emission and spectral narrowing at infrared wavelengths in solution-processed films made up of PbS quantum-dot nanocrystals. The results are relevant to optical amplification and lasing integrated upon a variety of substrates. The active optical medium operates at room temperature without any additional matrix material, providing an optical gain of 260 cm(-1) and a pump threshold of 1 mJ/cm(-2). Nanocrystals synthesized in an aqueous solution and stabilized by use of short ligands result in high quantum-dot volume fractions in solid films and in a redshift emission relative to absorption.
authors.affiliation: Department of Electrical and Computer Engineering, University of Toronto, Toronto M5S 1A4, Canada.
authors.forename: V
authors.initials: V
authors.lastname: Sukhovatkin
authors.forename: S
authors.initials: S
authors.lastname: Musikhin
authors.forename: I
authors.initials: I
authors.lastname: Gorelikov
authors.forename: S
authors.initials: S
authors.lastname: Cauchi
authors.forename: L
authors.initials: L
authors.lastname: Bakueva
authors.forename: E
authors.initials: E
authors.lastname: Kumacheva
authors.forename: E H
authors.initials: EH
authors.lastname: Sargent
mesh_terms: D045424:Complex Mixtures / Q000032:analysis* / Q000737:chemistry*; D007854:Lead / Q000737:chemistry* / Q000528:radiation effects*; D008567:Membranes, Artificial; D045663:Quantum Dots; D013055:Spectrophotometry, Infrared / Q000379:methods*; D013440:Sulfides / Q000737:chemistry* / Q000528:radiation effects*; D013696:Temperature
chemical_list: D045424:Complex Mixtures; D008567:Membranes, Artificial; D013440:Sulfides; C018391:lead sulfide; D007854:Lead