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Room-temperature amplified spontaneous emission at 1300 nm in solution-processed PbS quantum-dot films
V Sukhovatkin1, S Musikhin, I Gorelikov
1Department of Electrical and Computer Engineering, University of Toronto, Toronto M5S 1A4, Canada.
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.
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