The electronic structure of lead selenide quantum dots (QDs) has been investigated via low temperature photoluminescence excitation (PLE) and fluorescence line narrowing (FLN) spectroscopies. PLE and FLN spectroscopies only sample QDs in a narrow spectral range (&lt;10 meV) and can provide important information about the QDs’ electronic structure that is “averaged out” of traditional room temperature absorption measurements (peak widths ~50 meV). PLE and FLN spectra were collected at 77 K for PbSe QDs with a first (room temperature) absorption peak between 1200-1500 nm (corresponding to particle diameters of 3.5-5.0 nm). The low temperature spectra exhibit distinct features compared to room temperature absorption measurements (<i>eg</i>, narrowing, peak shifts, and line shape differences). These features will be analyzed and discussed in the context of fine structure splitting of the lowest PbSe exciton state.

Low temperature, size-selective fluorescence spectroscopy of PbSe quantum dots

249th National Meeting (2015)

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