Title :
Unravelling elementary non-radiative effects in nanocrystal quantum dots
Author :
Lagoudakis, P.G. ; Kraus, R.M. ; Rogach, A.L. ; Lupton, J.M. ; Feldmann, J. ; Talapin, D.V. ; Weller, H.
Author_Institution :
Dept. of Phys., Ludwig-Maximilians-Univ., Munchen, Germany
Abstract :
Spectrally resolved fluorescence decay measurements reveal a non-Auger like dependence of the photoluminescence decay rate with excitation density. Our results suggest that Auger recombination accelerates phonon assisted ionisation that lead to the formation of dark, non-emissive nanocrystal states.
Keywords :
Auger effect; dark states; electromagnetic decays; electron-hole recombination; excitons; fluorescence; ionisation; nanostructured materials; nonradiative transitions; phonons; photoluminescence; semiconductor quantum dots; Auger recombination; dark state formation; excitation density; nanocrystal quantum dots; nonemissive nanocrystal states; phonon assisted ionisation; photoluminescence decay rate; spectrally resolved fluorescence decay measurement; unravelling elementary nonradiative effects; Density measurement; Fluorescence; Ionization; Nanocrystals; Phonons; Photoluminescence; Quantum dots; Radiative recombination; Spontaneous emission; Tunneling;
Conference_Titel :
Quantum Electronics and Laser Science Conference, 2005. QELS '05
Print_ISBN :
1-55752-796-2
DOI :
10.1109/QELS.2005.1548847
