Faculty

Lewis J. Rothberg

Professor of Chemistry
Professor of Chemical Engineering

PhD, Harvard University, 1984

200 Hutchison Hall
(585) 273-4725
lewis.rothberg@rochester.edu

Website

Research Overview

The goal of our research group centers on understanding the materials science necessary to make viable optoelectronic devices from organic materials. These include, for example, light-emitting diodes, thin-film transistors, photodetectors, Xerographic photoreceptors, biological sensors and electrooptic modulators. The promise of organic materials is that they are amenable to processing and device fabrication schemes which can make them significantly less expensive than conventional alternatives. The first research mission involves study of the fundamental photophysics and charge transport properties of several classes of organic materials including conjugated polymers and oligomers, molecularly doped polymers and molecular crystals. Specifically, measurements of transient excited state spectroscopy, photoconductivity and photoluminescence are of import to determine the fundamental performance limits for organic electronics. The second line of research is the fabrication and characterization of organic devices. The purpose of these studies, in conjunction with the fundamental studies, is to understand the mechanism by which these devices work and to ascertain the practical limits on them. These are deduced from electrical and spectroscopic measurements on functioning devices. The final area of experimentation is aimed at developing new ways to make these devices and systems based upon them which take advantage of the processibility of organics. This involves research into the workings of various patterning and layering schemes such as "self-assembly" to create useful supramolecular structures. The ultimate vision motivating this avenue of investigation would be to make circuitry or displays on plastic using simple process technology which could bypass the need for expensive lithography and vacuum deposition.

Selected Publications

  • Klubek, K.P., Dont, S.C., Liao, L.S., Tang, C.W., Rothberg, L.J. "Investigating blue phosphorescent Ir dopant with phenyl-imidazole ligands," Submitted to Applied Physics Letters.
  • Winans, J.D., Hungerford, C., Shome, K., Rothberg, L.J., Fauchet, P.M. "Plasmonic effects of Ag nanopaticples studied with freestanding thin-film amorphous silicon solar cells," Solar Energy Materials and Solar Cells 2014, 15(7).
  • Klubek, K.P., Tang, C.W., Rothberg, L.J. "Investigation of blue phosphorescent organic light-emitting diode host and dopant stability," Organic Electronics 2014, 15(7), 1312-1316.
  • Marchetti, A.P., Haskins, T.L., Young. R.H., Rothberg, L.J. "Permanent polarization and charge distribution in organic light-emitting diodes (OLEDs): Insights from near-infared charge-modulation spectroscopy of an operating OLED," Journal of Applied Physics 2014, 115(11), Article Number: 114506.
  • Lee, S., Tang, C.W., Rothberg, L.J. "Effects of Emitting Layer Host Composition Profile on the Recombination Zone of Blue Phosphorescent Organic Light-emitting Diodes," Journal of the Society for Information Display 2013, 21, 55-59.
  • Wang, Q., Wallace, J.U., Lee, T.Y.H., Ou, J.J., Tsai, Y.T., Huang, Y.H., Wu, C.C., Rothberg, L.J., Chen, S.H. "Evaluation of Propylene-, Meta-, and Para-linked Triazine and Tert-butyltriphenylamine as Bipolar Hosts for Phosphorescent Organic Light-emitting Diodes," Journal of Materials Chemistry C. 2013, 1, 2224-2232.
  • Lee, S., Tang, C.W., Rothberg, L.J. "Effects of Mixed Host Spatial Distribution on the Efficiency of Blue Phosphorescent Organic Loght-emitting Diodes," Applied Physics Letters 2012, 101, id 043303, 3 pages.
  • Lee, S., Tang, C.W., Rothberg, L.J. "Improved blue phosphorescent OLEDs with a linearly graded mixed-host architecture," Digest of Technical Papers-Society for Information Display International Symposium 2012, 33.3, 441-444.
  • Lee, S., Tang, C.W., Rothberg, L.J. "Efficiency improvement of blue PhOLED with linearly-graded mixed host at low current density," Proceedings of Euro-display Symposium 2011, S6.6.
  • Marchetti, A. P., Sassin, K. E., Young, R. H., Rothberg, L. J., Kondakov, D. Y. "Integer Charge Transfer States in Organic Light-emitting Diodes: Optical Detection of Hole Carriers at the Anode Organic Interface," J. Appl. Phys. 2011, 109, 013709-013717.
  • Nelson, E. M., Rothberg, L. J. "Kinetics and Mechanism of Single-Stranded DNA Adsorption onto Citrate-Stabilized Gold Nanoparticles in Colloidal Solution," Langmuir 2011, 27, 1770-1777.
  • Rothberg, L. J. "Conjugated Polymers: Watching Ploymers Dance," Nature Chem. 2011, 3, 425-426.
  • Rothberg, L., Pan, S. "Plasmon-Enhanced Luminescence and Applications to Organic Electronics," Metal Enhanced Fluorescence 2009, Chris Geddes (Ed.), Wiley, 306-309.
  • Wyman, M., Marchetti, A., Rothberg, L. J., Young, R. H., and Kondakov, D. Y. "Luminescence quenching by charge carriers in organic light-emitting diodes," Digest of Technical Papers - Society for Information Display International Symposium 2009, 40, 306-309.
  • Chen, X., Zhao, C., Rothberg, L. J., and Ng, M.-K "Plasmon Enhancement of Bulk Heterojunction Organic Photovoltaic Devices by Electrode Modification," Appl. Phys. Lett. 2008, 93, 123302.
  • Kas, O. Y., Charati, M. B., Rothberg, L. J., Galvin, M. E. and Kiick, K. L. "Regulation of electronic behavior via confinement of PPV-based oligomers on peptide scaffolds," J. Mater. Chem. 2008, 18, 3847-3584.
  • Wang, Z. and Rothberg, L. J. "Structure and dynamics of single conjugated polymer chromophores by surface-enhanced Raman spectroscopy," ACS Nano 2007, 1, 299-306.
  • Zhang, Y., Wang, Z. J., Ng, M. K. and Rothberg, L. J. "Conformational reorganization and solvation dynamics of dendritic oligothiophenes," J. Phys. Chem. B 2007, 111, 13211-13216.
  • Li, H., Liang, R., Turner, D. H., Rothberg, L. J. and Duan, S. "Selective quenching of fluorescence from unbound oligonucleotides by gold nanoparticles as a probe of RNA structure," RNA-a Publication of the RNA Society 2007, 13, 2034-2041.
  • Gao, T. and Rothberg, L. J. "Label-free sensing of binding to Microarrays using brewster angle straddle interferometry," Anal. Chem. 2007, 79, 7589-7595.
  • Pan, S., Wang, Z., Rothberg, L. J. "Enhancement of Adsorbed Dye Monolayer Fluorescence by a Silver Nanoparticle Overlayer," J. Phys. Chem. B 2006, 110, 17383-17387.
  • Gao, T., Lu, J., Rothberg, L. J. "Biomolecular Sensing using Near-Null Single Wavelength Arrayed Imaging Reflectometry," Anal. Chem. 2006, 78, 6622-6627.
  • Wang, Z., Rothberg, L. J. "Origins of blinking in single-molecule Raman spectroscopy," J. of Phys. Chem. B 2005, 109, 3387-3391.
  • Pan, S., Rothberg, L. J. "Enhancement of Platinum Octaethyl Porphyrin Phosphorescence Near Nanotextured Silver Surfaces," J. Am. Chem. Soc. 2005, 127, 6087-6094.
  • Li, H. X., Rothberg, L. J. "Label-free colorimetric detection of specific sequences in genomic DNA amplified by polymerase chain reaction," J. Am. Chem. Soc. 2004, 126, 10958-10961.
  • Haskins, T., Chowdhury, A., Young, R. H., Lenhard, J. R., Marchetti, A. P., Rothberg, L. J. "Charge-induced luminescence quenching in organic light-emitting diodes," Chemistry of Materials 2004, 16, 4657-4680.