Department of Chemical Engineering and Applied Chemistry University of Toronto 200 College Street Toronto, ON, Canada
jeffrey.castrucci@utoronto.ca
I'm a PhD student in the labs of Prof Bender (http://www.chem-eng.utoronto.ca/facultystaff/profs/bender.htm) in the Department of Chemical Engineering and Applied Chemistry and Professor Lu in the Department of Material Science and Engineering (http://www.ecf.utoronto.ca/~luzheng/) at the University of Toronto, in Ontario, Canada.
Abstract: The electron mobilities in vapor-phase-deposited thin films of three fluorinated phenoxy boron subphthalocyanine (F5BsubPc, F12BsubPc and F17BsubPc) molecules are measured using admittance spectroscopy. The mobilities are found to be field dependent, following a Poole-Frenkel type relation, and are in the range of ~10-4 cm2 V-1 s-1 at typical operating field strengths for devices such as organic photovoltaic cells. A new F5BsubPc crystal polymorph (β-) is disclosed and its determination is critical to our ability to correlate charge carrier mobility and solid-state packing for each compound.
Abstract: The effect of silyl ether substitution on the physical and electrochemical properties of single and two-nitrogen centered arylamines was explored. It was found that this substitution can significantly lower the Tg and suppress crystallization of these compounds. This resulted in arylamines that were isolated as liquids, waxes, glasses, and in some cases crystalline solids at ambient conditions. Additionally, these silyl ether groups were found to be relatively strong electron donating groups with similar donating potentials to the well known methyl ether group. It is concluded that silyl ether substitution is a synthetic handle to greatly alter the physical properties of arylamines without substantially changing their basic electronic properties.
Abstract: Phthalimides have been found to react with Cl-BsubPc to produce a new class of BsubPc derivatives, phthalimido-boronsubphthalocyanines (Phth-BsubPcs). They exhibit a high quantum yield for photoluminescence (Φ), maintain a high molar extinction coefficient (ε) and have bipolar electrochemical stability previously unseen in simple BsubPc derivatives. Their bipolar electrochemical characteristics have been extended into simple organic electronic devices: in OLEDs as charge transporters and emitters.
Abstract: A fluorinated phenoxy boron subphthalocyanine (BsubPc) is shown to function as a fluorescent dopant emitter in small molecule organic light emitting diodes (OLEDs). Narrow electroluminescence (EL) emission with a full width at half-maximum of ∼30 nm was observed regardless of the host used, indicating that this narrow EL is intrinsic to the BsubPc molecule. A bathochromic shift and the growth of a new EL peak at higher wavelengths with increasing doping concentration were found to be a result of molecular aggregation. Excitation of BsubPc by direct charge trapping as well as Fo¨rster resonant energy transfer were shown using different host molecules. A maximum efficiency of 1.5 cd/A was achieved for a 4,4′-N,N′-dicarbazole-biphenyl (CBP) host.
