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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

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

Selected Publications


  • Robinson JW, Y Zhou, J Qu, JT Bays, and L Cosimbescu. 2016. "Highly Branched Polyethylenes as Lubricant Viscosity and Friction Modifiers." Tribology Letters 109:52-55.  doi:10.1016/j.reactfunctpolym.2016.10.003
  • Robinson JW, 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(26):Article No. 43611.  doi:10.1002/app.43611
  • Cosimbescu L, JW Robinson, Y Zhou, and J Qu. 2016. "Dual Functional Star Polymers for Lubricants." RSC Advances 6(89):86259-86268.  doi:10.1039/C6RA17461B
  • Huang Q, ED Walter, L Cosimbescu, D Choi, and JP Lemmon. 2016. "In situ electrochemical-electron spin resonance investigations of multi-electron redox reaction for organic radical cathodes." Journal of Power Sources 306:812-816.  doi:10.1016/j.jpowsour.2015.11.080


  • Wei X, L Cosimbescu, W Xu, JZ Hu, M Vijayakumar, J Feng, MY Hu, X Deng, J Xiao, J Liu, VL Sprenkle, and W Wang. 2015. "Towards High-Performance Nonaqueous Redox Flow Electrolyte through Ionic Modification of Active Species." Advanced Energy Materials 5(1):Article No. 1400678.  doi:10.1002/aenm.201400678
  • Cosimbescu L, X Wei, M Vijayakumar, W Xu, ML Helm, SD Burton, CM Sorensen, J Liu, VL Sprenkle, and W Wang. 2015. "Anion-Tunable Properties and Electrochemical Performance of Functionalized Ferrocene Compounds." Scientific Reports 5:14117.  doi:10.1038/srep14117
  • Ramasamy US, L Cosimbescu, and A Martini. 2015. "Temperature-Dependent Conformations of Model Viscosity Index Improvers." Tribology and Lubrication Technology 71(5):30-31. 
  • Robinson JW, P Bhattacharya, J Qu, JT 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 , vol. 60, no. 1, p. 185.  American Chemical Society, Washington, DC. 
  • Schwenzer B, L Cosimbescu, VA Glezakou, AJ Karkamkar, Z Wang, and RS Weber. 2015. "Use of Solvatochromism to Assay Preferential Solvation of a Prototypic Catalytic Site." Topics in Catalysis 58(4-6):258-270.  doi:10.1007/s11244-015-0367-z
  • Wei X, W Xu, J Huang, L Zhang, ED Walter, CW Lawrence, M Vijayakumar, WA Henderson, TL Liu, L Cosimbescu, B Li, VL Sprenkle, and W Wang. 2015. "Radical Compatibility with Nonaqueous Electrolytes and Its Impact on an All-Organic Redox Flow Battery." Angewandte Chemie International Edition 127(30):8808-8811.  doi:10.1002/ange.201501443


  • Wei X, W Xu, M Vijayakumar, L Cosimbescu, TL Liu, VL Sprenkle, and W Wang. 2014. "TEMPO-based Catholyte for High Energy Density Nonaqueous Redox Flow Batteries." Advanced Materials 26(45):7649-7653.  doi: 10.1002/adma.201403746


  • Lin G, L Cosimbescu, NJ Karin, A Gutowska, and BJ Tarasevich. 2013. "Injectable and thermogelling hydrogels of PCL-g-PEG: mechanisms, rheological and enzymatic degradation properties." Journal of Materials Chemistry B 1(9):1249-1255.  doi:10.1039/C2TB00468B
  • Huang Q, D Choi, L Cosimbescu, and JP 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(48):20921-20928.  doi:10.1039/c3cp54358g
  • Huang Q, L Cosimbescu, PK Koech, D Choi, and JP Lemmon. 2013. "Composite Organic Radical - Inorganic Hybrid Cathode for Lithium-ion Batteries." Journal of Power Sources 233(1):69-73.  doi:10.1016/j.jpowsour.2013.01.076
  • Koech PK, J Zhang, IV Kutnyakov, L Cosimbescu, SJ Lee, ME Bowden, TD Smurthwaite, and DJ Heldebrant. 2013. "Low viscosity alkanolguanidine and alkanolamidine liquids for CO2 capture." RSC Advances 3(2):556 - 572.  doi:10.1039/C2RA22801G
  • Nasybulin EN, W Xu, MH Engelhard, Z Nie, SD Burton, L Cosimbescu, ME Gross, and J Zhang. 2013. "Effects of electrolyte salts on the performance of Li-O2 batteries." Journal of Physical Chemistry C 117(6):2635-2645.  doi:10.1021/jp311114u
  • Rainbolt JE, PK Koech, E Polikarpov, JS Swensen, L Cosimbescu, AL Von Ruden, L Wang, LS Sapochak, AB Padmaperuma, and DJ Gaspar. 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(9):1876 - 1884.  doi:10.1039/C3TC00068K
  • Swensen JS, LF Wang, E Polikarpov, JE Rainbolt, PK Koech, L Cosimbescu, and AB Padmaperuma. 2013. "Near independence of OLED operating voltage on transport layer thickness." Synthetic Metals 163:29-32.  doi:10.1016/j.synthmet.2012.12.015


  • Lin G, L Cosimbescu, NJ Karin, and BJ Tarasevich. 2012. "Injectable and thermosensitive PLGA-g-PEG hydrogels containing hydroxyapatite: Preparation, characterization and in vitro release behavior." Biomedical Materials 7(2):Article No. 024107.  doi:10.1088/1748-6041/7/2/024107
  • Cosimbescu L, L Wang, ML Helm, E Polikarpov, JS Swensen, and AB Padmaperuma. 2012. "Electron Transport Materials: Synthesis, Properties and Device Performance." International Journal of Organic Chemistry 2(2):101-110.  doi:10.4236/ijoc.2012.22016
  • 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(53):6669-6671.  doi:10.1039/C2CC32466K


  • Cosimbescu L, AB Padmaperuma, and DJ 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(46):13498-13503.  doi:10.1021/jp2005869
  • Cosimbescu L, E Polikarpov, JS Swensen, JT Darsell, and AB Padmaperuma. 2011. "Hole-Rich Host Materials for Blue Phosphorescent OLEDs ." Journal of the Society for Information Display 19(4):353-359.  doi:10.1889/JSID19.4.353
  • Polikarpov E, PK Koech, L Wang, JS Swensen, L Cosimbescu, JE Rainbolt, AL Von Ruden, DJ Gaspar, and AB Padmaperuma. 2011. "Controlling charge transport in blue organic light-emitting devices by chemical functionalization of host materials." Journal of Photonics for Energy 1:Art. No. 011007.  doi:10.1117/1.3528499


  • Polikarpov E, JS Swensen, L Cosimbescu, PK Koech, JE Rainbolt, and AB Padmaperuma. 2010. "Emission Zone Control in Blue Organic Electrophosphorescent Devices Through Chemical Modification of Host Materials ." Applied Physics Letters 96(5):Art. No. 053306.  doi:10.1063/1.3298556
  • Von Ruden AL, L Cosimbescu, E Polikarpov, PK Koech, JS Swensen, L Wang, JT Darsell, and AB Padmaperuma. 2010. "Phosphine Oxide Based Electron Transporting and Hole Blocking Materials for Blue Electrophosphorescent Organic Light Emitting Devices." Chemistry of Materials 22(20):5678-5686.  doi:10.1021/cm1013653
  • Chopra N, JS Swensen, E Polikarpov, L Cosimbescu, F So, and AB Padmaperuma. 2010. "High efficiency and low roll-off blue phosphorescent organic light-emitting devices using mixed host architecture." Applied Physics Letters 97:033304.  doi:10.1063/1.3464969
  • Cosimbescu L, PK Koech, E Polikarpov, JS Swensen, AL Von Ruden, JE Rainbolt, and AB 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, vol. 41, no. 1, pp. 1887-1889.  Society for Information Display, Campbell, CA.  doi:10.1889/1.3500379
  • Koech PK, E Polikarpov, JE Rainbolt, L Cosimbescu, JS Swensen, AL Von Ruden, and AB 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(23):5534-5537.  doi:10.1021/ol102444j
  • Wang LF, DW Matson, E Polikarpov, JS Swensen, CC Bonham, L Cosimbescu, JJ Berry, DS Ginley, DJ Gaspar, and AB Padmaperuma. 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(4):043103.  doi:10.1063/1.3282526
  • Xiao J, D Choi, L Cosimbescu, PK Koech, J Liu, and JP Lemmon. 2010. "Exfoliated MoS2 Nanocomposite as an Anode Material for Lithium Ion Batteries." Chemistry of Materials 22(16):4522-4524. 


  • Koech PK, LS Sapochak, JE Rainbolt, L Cosimbescu, E Polikarpov, JS Swensen, LF Wang, AB Padmaperuma, and DJ Gaspar. 2009. "Design of new anchored p-dopants for high power efficiency OLEDs ." In Organic Light Emitting Materials and Devices XIII: Proceedings of the SPIE, vol. 7415, ed. F So and C Adachi, p. Article No. 741505.  SPIE , Bellingham, WA.  doi:10.1117/12.827298
  • Padmaperuma AB, PK Koech, L Cosimbescu, E Polikarpov, JS Swensen, N Chopra, F So, LS Sapochak, and DJ Gaspar. 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, vol. 7415, ed. F So and C Adachi, p. Paper No. 74150H.  SPIE , Bellingham, WA.  doi:10.1117/12.826905

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