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 $260 {\mathrm{cm}}^{-1}$ and a pump threshold of $1 \mathrm{mJ}/{\mathrm{cm}}^{-2}$. 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.

© 2005 Optical Society of America

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