Dresden 2009 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 29: Quantum dots: Optical properties II

HL 29.10: Talk

Wednesday, March 25, 2009, 12:15–12:30, BEY 154

Nanocrystal Quantum Dots as Emitters in DBR Microcavities — •Johannes Haase¹, Tobias Otto², Maik Langner¹, Dirk Dorfs², Hartmut Fröb¹, Alexander Eychmüller², and Karl Leo¹ — ¹TU Dresden, Institut für Angewandte Photophysik, George-Bähr-Str. 1, 01069 Dresden — ²TU Dresden, Physikalische Chemie und Elektrochemie, Bergstr. 66b, 01062 Dresden

Semiconductor nanocrystal quantum dots (NQD) have the outstanding property to emit photons of a wavelength depending on their physical size as a result of the quantum confinement. They are therefore spectral tunable emitters and furthermore exhibit very high quantum yields. For organic microcavity lasers or organic photonic boxes they can be used as alternative emitters or secondary emitters being coupled to the emission of the organic molecules. In our experiments, we use colloidal synthesized CdSe(core)/CdS(shell) rods, where the absorption edge is more blue shifted, with respect to the emission line, than for particles without shell. We incorporate these particles into transparent, thermally stable matrices with a high concentration of the NQDs. By varying the film thickness and changing the refractive index of the material by the amount of NQDs in the matrix material, we can modify the resonance conditions of the cavity to match the peak emission of the NQDs. We present emission spectra from micro-photoluminescence measurements.