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The UV-excited photoluminescence was measured for single CdSe nanocrystals and an average carrier multiplication efficiency of ∼13.1% was obtained when the excitation photon energy was set at ∼2.46 times of the nanocrystal energy gap.
Frequency up-converted lasing emission at visible wavelengths was observed from nanocrystal-infiltrated silica microbeads, which has been explained by the coupling of the two-photon pumped biexciton gain to the whispering gallery mode in a spherical microcavity.
We investigate the high-speed modulation characteristics of quantum dots in red emitting quantum dot-light emitting diodes, in which the -3dB cutoff frequency for 6-mm2 device is 1.5 MHz under optimized conditions. The introduction of a positive offset DC bias voltage greatly increases the modulation speed at low applied voltage range.
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