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Chemical & Biological Processing

Lelia Cosimbescu

Lelia Cosimbescu

Pacific Northwest National Laboratory
PO Box 999
Richland, WA 99352


Dr. Cosimbescu is an experienced research scientist, with extensive knowledge of organic chemistry and synthetic methodology complemented by a strong background in material science. Accomplishments for the past 12 years include a proven track record of innovation, product development and project management in various areas, such as display electronics (OLEDs and liquid crystals), fuel lubricants/additives and biomaterials for drug delivery. Successful leader of cross-functional teams and of complex projects through the process of development and commercialization of several new products invented. Dr. Cosimbescu is currently a Senior Research Scientist in the Materials Chemistry and Surface Research Group in the Energy and Efficiency Division at Pacific Northwest National Laboratory. She joined PNNL in 2008.


  • 6,569,612 - Photographic element containing a high-dye-yield yellow coupler
  • 6,664,396 - One step synthesis for the formation of quinacridone compounds
  • 7,026,481 - Synthesis of quinacridone compounds
  • 6,876,684 - Organic vertical cavity lasing device having organic active region
  • 7,056,601 - OLED Device with asymmetric host
  • 7,195,829 - Organic Element for Electroluminescent Devices
  • 7,252,893 - Anthracene Derivative Host having ranges of Dopants
  • 7,326,371 - Electroluminescent Device with Anthracene Derivative Host
  • 7,887,931 - Electroluminescent device with Anthracene Derivative Host
  • OLED materials and devices useful as hosts, hole transport or dopants: Seven additional applications filed
  • 20100107476 - Compositions and Methods for Direct Injection Fuel additives, one application filed

PNNL Patents

Research Interests

  • Dr. Cosimbescu's research interests include functional molecules that can self assemble or participate in molecular recognition events, manipulation of a variety of chemistries for efficient scale-up processes, exploration of the use of hydrogel-like materials for non-biomedical applications to exploit their phase changing properties, phase changing materials, design and development of organic electrolytes for hybrid battery systems, functionalization of nanomaterials for sensing and nanoporous and mesoporous materials and applications.

Education and Credentials

  • Ph.D., Organic Chemistry, University of Texas at Austin, Feb 2000
  • B.S., Chemistry, Northern Arizona University, May 1994

PNNL Publications


  • Polikarpov E., K.O. Albrecht, J.P. Page, D. Malhotra, P.K. Koech, L. Cosimbescu, and D.J. Gaspar. 2019. "Critical Fuel Property Evaluation for Potential Gasoline and Diesel Biofuel Blendstocks with Low Sample Volume Availability." Fuel 238. PNNL-SA-134684. doi:10.1016/j.fuel.2018.09.129


  • Bapat A., R. Erck, B. Seymour, B. Zhao, and L. Cosimbescu. 2018. "Lipophilic Polymethacrylate Ionic Liquids as lubricant additives." European Polymer Journal 108. PNNL-SA-134547. doi:10.1016/j.eurpolymj.2018.08.026
  • Bapat A., R. Erck, B. Seymour, B. Zhao, and L. Cosimbescu. 2018. "What is the effect of lipophilic polymeric ionic liquids on friction and wear?." Reactive and Functional Polymers 131. PNNL-SA-134552. doi:10.1016/j.reactfunctpolym.2018.07.020
  • Cosimbescu L., A. Vellore, U. Ramasamy, S.A. Burgess, and A. Martini. 2018. "Low Molecular Weight Polymethacrylates as Multi-Functional Lubricant Additives." European Polymer Journal 104. PNNL-SA-129102. doi:10.1016/j.eurpolymj.2018.04.029


  • Cosimbescu L., J.W. Robinson, Y. Zhou, and J. Qu. 2016. "Dual Functional Star Polymers for Lubricants." RSC Advances 6, no. 89:86259-86268. PNNL-SA-119075. doi:10.1039/C6RA17461B
  • Huang Q., E.D. Walter, L. Cosimbescu, D. Choi, and J.P. Lemmon. 2016. "In situ electrochemical-electron spin resonance investigations of multi-electron redox reaction for organic radical cathodes." Journal of Power Sources 306. PNNL-SA-107032. doi:10.1016/j.jpowsour.2015.11.080
  • Robinson J.W., Y. Zhou, J. Qu, J.T. Bays, and L. Cosimbescu. 2016. "Highly Branched Polyethylenes as Lubricant Viscosity and Friction Modifiers." Tribology Letters 109. PNNL-SA-119079. doi:10.1016/j.reactfunctpolym.2016.10.003
  • Robinson J.W., Y. Zhou, J. Qu, R. Erck, and L. Cosimbescu. 2016. "Effects of Star-Shaped Poly(alkyl methacrylate) Arm Uniformity on Lubricant Properties." Journal of Applied Polymer Science 133, no. 26:Article No. 43611. PNNL-SA-113593. doi:10.1002/app.43611


  • Cosimbescu L., X. Wei, M. Vijayakumar, W. Xu, M.L. Helm, S.D. Burton, and C.M. Sorensen, et al. 2015. "Anion-Tunable Properties and Electrochemical Performance of Functionalized Ferrocene Compounds." Scientific Reports 5. PNNL-SA-104406. doi:10.1038/srep14117
  • Ramasamy U., L. Cosimbescu, and A. Martini. 2015. "Temperature-Dependent Conformations of Model Viscosity Index Improvers." Tribology and Lubrication Technology 71, no. 5:30-31. PNNL-SA-111361.
  • Robinson J.W., P. Bhattacharya, J. Qu, J.T. Bays, and L. Cosimbescu. 2015. "Investigations of non-linear polymers as high performance lubricant additives." In Proceedings of the 249th ACS National Meeting and Exhibition, March 22-26, 2015, Denver, Colorado. Energy & Fuels Preprints, 60, 185. Washington, District Of Columbia:American Chemical Society. PNNL-SA-106487.
  • Schwenzer B., L. Cosimbescu, V.A. Glezakou, A.J. Karkamkar, Z. Wang, and R.S. Weber. 2015. "Use of Solvatochromism to Assay Preferential Solvation of a Prototypic Catalytic Site." Topics in Catalysis 58, no. 4-6:258-270. PNNL-SA-101069. doi:10.1007/s11244-015-0367-z
  • Wei X., L. Cosimbescu, W. Xu, J.Z. Hu, M. Vijayakumar, J. Feng, and M.Y. Hu, et al. 2015. "Towards High-Performance Nonaqueous Redox Flow Electrolyte through Ionic Modification of Active Species." Advanced Energy Materials 5, no. 1:Article No. 1400678. PNNL-SA-97506. doi:10.1002/aenm.201400678
  • Wei X., W. Xu, J. Huang, L. Zhang, E.D. Walter, C.W. Lawrence, and M. Vijayakumar, et al. 2015. "Radical Compatibility with Nonaqueous Electrolytes and Its Impact on an All-Organic Redox Flow Battery." Angewandte Chemie International Edition 127, no. 30:8808-8811. PNNL-SA-107928. doi:10.1002/ange.201501443


  • Wei X., W. Xu, M. Vijayakumar, L. Cosimbescu, T.L. Liu, V.L. Sprenkle, and W. Wang. 2014. "TEMPO-based Catholyte for High Energy Density Nonaqueous Redox Flow Batteries." Advanced Materials 26, no. 45:7649-7653. PNNL-SA-105126. doi:10.1002/adma.201403746


  • Huang Q., D. Choi, L. Cosimbescu, and J.P. Lemmon. 2013. "Multi-electron redox reaction of an organic radical cathode induced by a mesopore carbon network with nitroxide polymers." Physical Chemistry Chemical Physics. PCCP 15, no. 48:20921-20928. PNNL-SA-94276. doi:10.1039/c3cp54358g
  • Koech P.K., J. Zhang, I.V. Kutnyakov, L. Cosimbescu, S. Lee, M.E. Bowden, and T.D. Smurthwaite, et al. 2013. "Low viscosity alkanolguanidine and alkanolamidine liquids for CO2 capture." RSC Advances 3, no. 2:556 - 572. PNWD-SA-10043. doi:10.1039/C2RA22801G
  • Lin G., L. Cosimbescu, N.J. Karin, A. Gutowska, and B.J. Tarasevich. 2013. "Injectable and thermogelling hydrogels of PCL-g-PEG: mechanisms, rheological and enzymatic degradation properties." Journal of Materials Chemistry B 1, no. 9:1249-1255. PNWD-SA-9299. doi:10.1039/C2TB00468B
  • Nasybulin E.N., W. Xu, M.H. Engelhard, Z. Nie, S.D. Burton, L. Cosimbescu, and M.E. Gross, et al. 2013. "Effects of electrolyte salts on the performance of Li-O2 batteries." Journal of Physical Chemistry C 117, no. 6:2635-2645. PNNL-SA-91330. doi:10.1021/jp311114u
  • Rainbolt J.E., P.K. Koech, E. Polikarpov, J.S. Swensen, L. Cosimbescu, A.L. Von Ruden, and L. Wang, et al. 2013. "Synthesis and characterization of p-type conductivity dopant 2-(3-(adamantan-1-yl)propyl)-3,5,6-trifluoro-7,7,8,8-tetracyanoquinodimethane." Journal of Materials Chemistry C 1, no. 9:1876 - 1884. PNNL-SA-77092. doi:10.1039/C3TC00068K
  • Swensen J.S., L. Wang, L. Wang, E. Polikarpov, J.E. Rainbolt, P.K. Koech, and L. Cosimbescu, et al. 2013. "Near independence of OLED operating voltage on transport layer thickness." Synthetic Metals 163. PNNL-SA-86614. doi:10.1016/j.synthmet.2012.12.015


  • Cosimbescu L., L. Wang, M.L. Helm, E. Polikarpov, J.S. Swensen, and A.B. Padmaperuma. 2012. "Electron Transport Materials: Synthesis, Properties and Device Performance." International Journal of Organic Chemistry 2, no. 2:101-110. PNNL-SA-77984. doi:10.4236/ijoc.2012.22016
  • Lin G., L. Cosimbescu, N.J. Karin, and B.J. Tarasevich. 2012. "Injectable and thermosensitive PLGA-g-PEG hydrogels containing hydroxyapatite: Preparation, characterization and in vitro release behavior." Biomedical Materials 7, no. 2:Article No. 024107. PNWD-SA-9497. doi:10.1088/1748-6041/7/2/024107
  • Wang W., W. Xu, L. Cosimbescu, D. Choi, L. Li, and Z. Yang. 2012. "Anthraquinone with Tailored Structure for Nonaqueous Metal-Organic Redox Flow Battery." Chemical Communications 48, no. 53:6669-6671. PNNL-SA-87199. doi:10.1039/C2CC32466K


  • Cosimbescu L., A.B. Padmaperuma, and D.J. Gaspar. 2011. "7,7,8,8-Tetracyanoquinodimethane based molecular dopants for p-type doping of OLEDs: A theoretical investigation." Journal of Physical Chemistry A 115, no. 46:13498-13503. PNNL-SA-77394. doi:10.1021/jp2005869
  • Cosimbescu L., E. Polikarpov, J.S. Swensen, J.T. Darsell, and A.B. Padmaperuma. 2011. "Hole-Rich Host Materials for Blue Phosphorescent OLEDs." Journal of the Society for Information Display 19, no. 4:353-359. PNNL-SA-74898. doi:10.1889/JSID19.4.353
  • Polikarpov E., P.K. Koech, L. Wang, J.S. Swensen, L. Cosimbescu, J.E. Rainbolt, and A.L. Von Ruden, et al. 2011. "Controlling charge transport in blue organic light-emitting devices by chemical functionalization of host materials." Journal of Photonics for Energy 1. PNNL-SA-74814. doi:10.1117/1.3528499


  • Chopra N., J.S. Swensen, E. Polikarpov, L. Cosimbescu, F. So, and A.B. Padmaperuma. 2010. "High efficiency and low roll-off blue phosphorescent organic light-emitting devices using mixed host architecture." Applied Physics Letters 97. PNNL-SA-71085. doi:10.1063/1.3464969
  • Cosimbescu L., P.K. Koech, E. Polikarpov, J.S. Swensen, A.L. Von Ruden, J.E. Rainbolt, and A.B. Padmaperuma. 2010. "Molecular Engineering of Host Materials for Blue Phosphorescent OLEDs: Past, Present and Future." In SID International Symposium Digest of Technical Papers, Papers from the Annual Symposium, May 23-28, 2010, Seattle, Washington, 41, 1887-1889. Campbell, California:Society for Information Display. PNNL-SA-71348. doi:10.1889/1.3500379
  • Koech P.K., E. Polikarpov, J.E. Rainbolt, L. Cosimbescu, J.S. Swensen, A.L. Von Ruden, and A.B. Padmaperuma. 2010. "Synthesis and application of pyridine-based ambipolar hosts: control of charge balance in organic light emitting devices (OLEDs) by chemical structure modification." Organic Letters 12, no. 23:5534-5537. PNNL-SA-75168. doi:10.1021/ol102444j
  • Polikarpov E., J.S. Swensen, L. Cosimbescu, P.K. Koech, J.E. Rainbolt, and A.B. Padmaperuma. 2010. "Emission Zone Control in Blue Organic Electrophosphorescent Devices Through Chemical Modification of Host Materials." Applied Physics Letters 96, no. 5:Art. No. 053306. PNNL-SA-68607. doi:10.1063/1.3298556
  • Von Ruden A.L., L. Cosimbescu, E. Polikarpov, P.K. Koech, J.S. Swensen, L. Wang, and J.T. Darsell, et al. 2010. "Phosphine Oxide Based Electron Transporting and Hole Blocking Materials for Blue Electrophosphorescent Organic Light Emitting Devices." Chemistry of Materials 22, no. 20:5678-5686. PNNL-SA-72786. doi:10.1021/cm1013653
  • Wang L., L. Wang, D.W. Matson, E. Polikarpov, J.S. Swensen, C.C. Bonham, and L. Cosimbescu, et al. 2010. "Highly efficient blue organic light emitting device using indium-free transparent anode Ga:ZnO with scalability for large area coating." Journal of Applied Physics 107, no. 4:043103. PNNL-SA-66289. doi:10.1063/1.3282526
  • Xiao J., D. Choi, L. Cosimbescu, P.K. Koech, J. Liu, and J.P. Lemmon. 2010. "Exfoliated MoS2 Nanocomposite as an Anode Material for Lithium Ion Batteries." Chemistry of Materials 22, no. 16:4522-4524. PNNL-SA-72496.


  • Koech P.K., L.S. Sapochak, J.E. Rainbolt, L. Cosimbescu, E. Polikarpov, J.S. Swensen, and L. Wang, et al. 2009. "Design of new anchored p-dopants for high power efficiency OLEDs." In Organic Light Emitting Materials and Devices XIII: Proceedings of the SPIE, edited by F So and C Adachi, 7415, Article No. 741505. Bellingham, Washington:SPIE. PNNL-SA-67550. doi:10.1117/12.827298
  • Padmaperuma A.B., P.K. Koech, L. Cosimbescu, E. Polikarpov, J.S. Swensen, N. Chopra, and F. So, et al. 2009. "Tuning charge balance in PHOLEDs with ambipolar host materials to achieve high efficiency." In Organic Light Emitting Materials and Devices XIII: Proceedings of the SPIE, edited by F So and C Adachi, 7415, Paper No. 74150H. Bellingham, Washington:SPIE. PNNL-SA-68473. doi:10.1117/12.826905

Chemical & Biological Processing

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