Size selective photoluminescence excitation spectroscopy in CdTe quantum dots
Citation:Rakovich, Yu.P.,Walsh, L., Bradley, L., Donegan, J. F., Talapin, D., Rogach, A.L., Eychmuller, A., Size selective photoluminescence excitation spectroscopy in CdTe quantum dots, Proceedings of SPIE, Opto-Ireland 2002: Optics and Photonics Technologies and Applications , Galway, Ireland , 5 September 2003, edited by Thomas J. Glynn , 4876, 2003, pp432 - 437
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We present a photoluminescence and photoluminescence excitation study of CdTe quantum dots, prepared via a novel organometallic approach. The global photoluminescence (excited at the energy above the absorption edge) showed a red shift of 75 meV with respect to the first absorption peak. This band edge emission was found to be strongly dependent on the excitation photon. Resonant emission spectra showed a pronounced spectral shift and line narrowing with decreasing excitation energy. The resonant Stokes shifts were extracted from photoluminescence and photoluminescence excitation data. The minimum magnitude of the resonant Stokes shift of 14 meV was obtained at room temperature.
Type of material:Poster
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