Lewis Rothberg

Lewis Rothberg

Professor of Chemistry, Chemical Engineering

Ph.D. 1984, Harvard University

Physical Chemistry: Organic Device Science

Our group works in the areas of Organic Electronics, Plasmon-enhanced Spectroscopy and Biomolecular Sensing. The vision behind our studies of Organic Electronics is to understand easily processed organic materials for inexpensive applications as the active element in light-emitting diodes, thin film transistors and photovoltaic devices. We study the science of light emission, charge photogeneration and charge transport that underpins future applications of polymers in flexible displays, electronic paper and organic solar cells. The techniques we use span the range from transient spectroscopy of excited state relaxation to charge modulation spectroscopy in devices. We work with novel materials such as self-organizing chiral conjugated oligomers, dendritic side group polymers and water-soluble emissive polymers. Our current collaborators in the Organic Electronics area are Man Kit Ng, Esther Conwell and Al Marchetti (Chemistry), Shaw Chen and Ching Tang (Chemical Engineering), Mary Galvin (University of Delaware), Michael Rubner and Tim Swager (MIT), Ralph Young (Eastman Kodak) and Darryl Smith (Los Alamos). Recent accomplishments include single chromophore studies of conjugated polymers, mechanistic work on the salvation of thiophene-containing dendrimers and plasmonic enhancement of organic photovoltaics.

In the biomolecular sensor area, we aim to develop new optical detection approaches based on interactions with nanoparticles, reflectivity, Raman spectroscopy and radiative engineering of fluorescent decay rates. Coupled to our sensing effort, we are studying the basic science of single molecule Raman and fluorescence spectroscopy. Our collaborators in this area are Ben Miller (Dermatology), Todd Krauss and Doug Turner (Chemistry), Hong Yang (Chemical Engineering) and Howard Federoff (Center for Aging). Recent accomplishments include the invention of rapid sequence screening technology based on electrostatic interactions between gold nanoparticles and DNA as well as development of reflective interferometry, a label-free microarray reading technology with high sensitivity.

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  201415(7).
Klubek, K.P., Tang, C.W., Rothberg, L.J.  "Investigation of blue phosphorescent organic light-emitting diode host and dopant stability,"  Organic Electronics  201415(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  2014115(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  20132155-59.
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.  201312224-2232.
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  2012101id 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  201233.3441-444.
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  2011S6.6.
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.  2011109013709-013717.
Nelson, E. M., Rothberg, L. J.  "Kinetics and Mechanism of Single-Stranded DNA Adsorption onto Citrate-Stabilized Gold Nanoparticles in Colloidal Solution,"  Langmuir  2011271770-1777.
Rothberg, L. J.  "Conjugated Polymers: Watching Ploymers Dance,"  Nature Chem.  20113425-426.
Rothberg, L., Pan, S.  "Plasmon-Enhanced Luminescence and Applications to Organic Electronics,"  Metal Enhanced Fluorescence  2009Chris Geddes (Ed.), Wiley306-309.
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  200940306-309.
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.  200893123302.
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.  2008183847-3584.
Wang, Z. and Rothberg, L. J.  "Structure and dynamics of single conjugated polymer chromophores by surface-enhanced Raman spectroscopy,"  ACS Nano  20071299-306.
Zhang, Y., Wang, Z. J., Ng, M. K. and Rothberg, L. J.   "Conformational reorganization and solvation dynamics of dendritic oligothiophenes,"  J. Phys. Chem. B   200711113211-13216.
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  2007132034-2041.
Gao, T. and Rothberg, L. J.   "Label-free sensing of binding to Microarrays using brewster angle straddle interferometry,"  Anal. Chem.  2007797589-7595.
Pan, S., Wang, Z., Rothberg, L. J.  "Enhancement of Adsorbed Dye Monolayer Fluorescence by a Silver Nanoparticle Overlayer,"  J. Phys. Chem. B  200611017383-17387.
Gao, T., Lu, J., Rothberg, L. J.  "Biomolecular Sensing using Near-Null Single Wavelength Arrayed Imaging Reflectometry,"  Anal. Chem.  2006786622-6627.
Wang, Z., Rothberg, L. J.  "Origins of blinking in single-molecule Raman spectroscopy,"  J. of Phys. Chem. B  20051093387-3391.
Pan, S., Rothberg, L. J.  "Enhancement of Platinum Octaethyl Porphyrin Phosphorescence Near Nanotextured Silver Surfaces,"  J. Am. Chem. Soc.  20051276087-6094.
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.  200412610958-10961.
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  2004164657-4680.
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Professor Rothberg's Contact Information...

Office: Hutchison 462
Phone: (585) 273-4725

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