HERODOT. Heterogeneous quantum rod and quantum dot nanomaterials, towards a novel generation of photonic devices.

Electron hole recombination in organic materials yields a ratio 1:3 of singlet and triplet excited states. In this project we will attempt to recuperate the non-emitting tripletsby luminescent and photostable II-VI semiconductor nanoparticles (Q-dots). Several matrices, available commercially or through collaboration with other groups, will be combined with CdS- or CdSe-Q-dots (2 to 6 nm) in thin spin-coated films. The electron and hole mobility will be determined by the time of flight method in the presence and absence of Q-dots. It will be attempted to develop models to explain the experimental results and to link them to fundamental parameters such as trap depth, concentration, width of the DOS. Time-resolved luminescence of the Q-dots will yield information on the mobility of triplet excitons generated in the matrix. While the major techniques to be used are TOF, UPS and nano- or microsecond spectroscopy it is evident that where relevant morphological characterization of the films will be performed using fluorescence microscopy or atomic force microscopy.

Keywords:triplets, carrier mobility, OLEDS, Semiconductors, Photophysics, Nanomaterials

Disciplines:Physical chemistry, Sustainable chemistry, Condensed matter physics and nanophysics