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We demonstrate tunable room-temperature amplified spontaneous emission and lasing from blue-emitting core-shell CdS/ZnS nanocrystals (NCs) stabilized in a sol-gel derived silica matrix. Variable stripe length measurements show that these NC-silica composites have a modal gain of ∼100 cm-1 at room temperature. Coating microspheres with a NC-silica composite film via a facile process resulted in uniform resonators that exhibit room-temperature lasing over long periods of continuous excitation. This work opens up a spectral window for emission tunable, microscale NC-based lasers. [ABSTRACT FROM AUTHOR]

We report on the fabrication of polymer waveguides containing infrared-emitting nanocrystal quantum dots. Both PbSe and InAs nanocrystal quantum dots are incorporated into a fluorinated polymer by a surface functionalization method. The optical properties of the nanocrystal quantum dots are shown to be unaffected by the entire fabrication process. This method may provide a versatile platform for integration of nanocrystal quantum dots into planar photonic circuits. [ABSTRACT FROM AUTHOR]

The article proposes two competing mechanisms occurring simultaneously to generate monomers in the preparation of PbSe nanocrystals based on lead carboxylates and organo-phosphines. Nanocrystals are synthesized by rapidly injecting TOPSe into a heated solution of Pb(oleate)2. The first mechanism shows TOPSe reacts directly with the Pb² center to produce TOPO, an oleate anhydride and PbSe monomer. The second mechanism shows that Pb² is reduced by diphenylphosphine.