Journal
OPTICS LETTERS
Volume 30, Issue 2, Pages 171-173Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.30.000171
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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. (C) 2005 Optical Society of America.
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