Skip to Main Content U.S. Department of Energy
Energy and Environment Directorate

Asanga Padmaperuma

Asanga Padmaperuma

Pacific Northwest National Laboratory
PO Box 999
Richland, WA 99352
(509) 372-4895


Dr. Padmaperuma is a Senior Research Scientist in the Applied Materials Science Group in the Energy and Efficiency Division at the Pacific Northwest National Laboratory. Dr. Padmaperuma joined the lab in 2006.


  • Improved OLED Devices
  • Organic materials with tunable electric and electroluminescent properties
  • Organic phosphine sulfide materials for electronic applications

Education and Credentials

  • B.S.c., University of Colombo, Colombo Sri Lanka, 1996
  • M.S., University of Nevada at Las Vegas, 2000
  • Ph.D., University of Southern California, 2003

PNNL Patents

PNNL Publications


  • Olarte MV, AB Padmaperuma, J Ferrell, ED Christensen, RT Hallen, RB Lucke, SD Burton, TL Lemmon, MS Swita, G Fioroni, DC Elliott, and C Drennan. 2017. "Characterization of Upgraded Fast Pyrolysis Oak Oil Distillate Fractions from Sulfided and Non-Sulfided Catalytic Hydrotreating." Fuel 202:620-630.  doi:10.1016/j.fuel.2017.03.051


  • Ferrell J, MV Olarte, ED Christensen, AB Padmaperuma, RM Connatser, F Stankovikj, D Meier, and VA Paasikallio. 2016. "Standardization of Chemical Analytical Techniques for Pyrolysis Bio-oil: History, Challenges, and Current Status of Methods." Biofuels, Bioproducts & Biorefining 10(5):496-507.  doi:10.1002/bbb.1661
  • Olarte MV, AH Zacher, AB Padmaperuma, SD Burton, HM Job, TL Lemmon, MS Swita, LJ Rotness, Jr, GG Neuenschwander, JG Frye, and DC Elliott. 2016. "Stabilization of Softwood-Derived Pyrolysis Oils for Continuous Bio-oil Hydroprocessing." Topics in Catalysis 59(1):55-64.  doi:10.1007/s11244-015-0505-7
  • Tan E, LJ Snowden-Swan, M Talmadge, A Dutta, SB Jones, K Kallupalayam Ramasamy, MJ Gray, RA Dagle, AB Padmaperuma, MA Gerber, AH Sahir, L Tao, and Y Zhang. 2016. "Comparative Techno-economic Analysis and Process Design for Indirect Liquefaction Pathways to Distillate-range Fuels via Biomass-derived Oxygenated Intermediates Upgrading." Biofuels, Bioproducts & Biorefining 11(1):41-66.  doi:10.1002/bbb.1710


  • Polikarpov E, D Catalini, AB Padmaperuma, P Das, TL Lemmon, BW Arey, and CA Fernandez. 2015. "A High Efficiency Rare Earth-Free Orange Emitting Phosphor." Optical Materials 46:614-618.  doi:10.1016/j.optmat.2015.04.013
  • Blochwitz-Nimoth J, A Bhandari, D Boesch, CR Fincher, DJ Gaspar, DW Gotthold, MT Greiner, J Kido, D Kondakov, R Korotkov, VA Krylova, F Loeser, MH Lu, ZH Lu, B Lussem, L Moro, AB Padmaperuma, E Polikarpov, VV Rostovtsev, H Sasabe, G Silverman, ME Thompson, M Tietze, YS Tyan, M Weaver, X Xin , and X Zeng. 2015. OLED Fundamentals: Materials, Devices, and Processing of Organic Light-Emitting Diodes , ed. Dan Gaspar, Evgueni Polikarpov.  CRC Press/Taylor and Francis Group, Boca Raton, FL. 


  • Freeman CJ, SB Jones, AB Padmaperuma, DM Santosa, C Valkenburg, and J Shinn. 2013. Initial Assessment of U.S. Refineries for Purposes of Potential Bio-Based Oil InsertionsPNNL-22432, Pacific Northwest National Laboratory, Richland, WA. 
  • Jones SB, PA Meyer, LJ Snowden-Swan, AB Padmaperuma, E Tan, A Dutta, J Jacobson, and K Cafferty. 2013. Process Design and Economics for the Conversion of Lignocellulosic Biomass to Hydrocarbon Fuels: Fast Pyrolysis and Hydrotreating Bio-Oil PathwayPNNL-23053; NREL/TP-5100-61178, Pacific Northwest National Laboratory, Richland, WA. 
  • Rainbolt JE, AB Padmaperuma, N Govind, and DJ Gaspar. 2013. "Substituent effects on the geometric and electronic properties of tetracyano-p-quinodimethane (TCNQ): A theoretical study." Molecular Simulation 39(5):350-356. 
  • 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


  • Padmaperuma AB. 2012. "Substituted molecular p-dopants: A theoretical study." Advances in Materials Physics and Chemistry 2(3):163-175.  doi:10.4236/ampc.2012.23025
  • Polikarpov E, and AB Padmaperuma. 2012. "Materials design concepts for efficient blue OLEDs: A joint theoretical and experimental study." Material Matters 7(1):2-8. 
  • Xu W, AL Read, PK Koech, D Hu, CM Wang, J Xiao, AB Padmaperuma, GL Graff, J Liu, and J Zhang. 2012. "Factors Affecting the Battery Performance of Anthraquinone-based Organic Cathode Materials." Journal of Materials Chemistry 22(9):4032-4039.  doi:10.1039/c2jm15764k
  • 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
  • Padmaperuma AB, and CA Fernandez. 2012. "Heteroleptic cyclometalated Ir(III) complexes with charge transporting groups: A theoretical study." In Organic Light Emitting Materials and Devices XVI, August 12, 2012, San Diego, California. Proceedings of the SPIE, vol. 8476, SPIE, Bellingham, WA.  doi:10.1117/12.949510
  • Schwenzer B, L Wang, JS Swensen, AB Padmaperuma, G Silverman, R Korotkov, and DJ Gaspar. 2012. "Tuning the Optical Properties of Mesoporous TiO2 Films by Nanoscale Engineering." Langmuir 28(26):10072-10081.  doi:10.1021/la301450h
  • Swensen JS, LF Wang, JE Rainbolt, PK Koech, E Polikarpov, DJ Gaspar, and AB Padmaperuma. 2012. "Characterization of solution processed, p-doped films using hole-only devices and organic field-effect transistors." Organic Electronics 13(12):3085-3090.  doi:10.1016/j.orgel.2012.07.045
  • Xu W, X Chen, F Ding, J Xiao, D Wang, A Pan, J Zheng, XS Li, AB Padmaperuma, and J Zhang. 2012. "Reinvestigation on the state-of-the-art nonaqueous carbonate electrolytes for 5 V Li-ion battery applications." Journal of Power Sources 213:304-316.  doi:10.1016/j.jpowsour.2012.04.031


  • 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
  • Swensen JS, E Polikarpov, AL Von Ruden, L Wang, LS Sapochak, and AB Padmaperuma. 2011. "Improved efficiency in blue phosphorescent organic light emitting devices using host materials of lower triplet energy than the phosphorescent blue emitter." Advanced Functional Materials 21(17):3250-3258.  doi:10.1002/adfm.201100586
  • Swensen JS, JE Rainbolt, L Wang, PK Koech, E Polikarpov, AB Padmaperuma, and DJ Gaspar. 2011. "Blue phosphorescent organic light-emitting devices utilizing cesium-carbonate-doped 2,4,6-tris(2',4'-difluoro-[1,1'- biphenyl]-4-yl)-1,3,5-triazine." Journal of Photonics for Energy 1:Art. No. 011008 .  doi:10.1117/1.3528003


  • 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
  • Kim D, S Salman, V Coropceanu, E Salomon, AB Padmaperuma, LS Sapochak, A Kahn, and JL Bredas. 2010. "Phosphine oxide derivatives as hosts for blue phosphors: A joint theoretical and experimental study of their electronic structure ." Chemistry of Materials 22(1):247-254. 
  • Koech PK, AB Padmaperuma, L Wang, JS Swensen, E Polikarpov, JT Darsell, JE Rainbolt, and DJ Gaspar. 2010. "Synthesis and application of 1,3,4,5,7,8-Hexafluorotetracyanonaphtoquinodimethane (F6-TNAP): A Conductivity Dopant for Organic Light-Emitting Devices." Chemistry of Materials 22(13):3926-3932. 
  • 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 L, JS Swensen, E Polikarpov, DW Matson, CC Bonham, WD Bennett, DJ Gaspar, and AB Padmaperuma. 2010. "Highly efficient blue organic light emitting devices with indium-free transparent anode on flexible substrates." Organic Electronics 11(9):1555-1560.  doi:10.1016/j.orgel.2010.06.018
  • 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


  • Polikarpov E, JS Swensen, N Chopra, F So, and AB Padmaperuma. 2009. "An ambipolar phosphine oxide-based host for high power efficiency blue phosphorescent organic light emitting devices." Applied Physics Letters 94(22):Art. No. 223304. 
  • Bhansali US, E Polikarpov, JS Swensen, W Chen, H Jia, DJ Gaspar, BE Gnade, AB Padmaperuma, and MA Omary. 2009. "High-efficiency turquoise-blue electrophosphorescence from a Pt(II)-pyridyltriazolate complex in phosphine oxide host." Applied Physics Letters 95(23):Art. No. 233304. 
  • 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
  • Matson DW, CC Bonham, JS Swensen, L Wang, AB Padmaperuma, DJ Gaspar, JJ Berry, AK Sigdel, CW Gorrie, and DS Ginley. 2009. "Development of large area transparent conducting oxides from a combinatorial lead for organic solid state lighting." In Proceedings of the SPIE: Organic Light Emitting Materials and Devices XIII, vol. 7415, ed. F So, C Adachi, p. Paper No. 74150X.  SPIE, Bellingham, WA.  doi:10.1117/12.827281
  • 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


  • Cai X, AB Padmaperuma, LS Sapochak, PA Vecchi, and PE Burrows. 2008. "Electron and Hole Transport in a Wide Bandgap Organic Phosphine Oxide for Blue Electrophosphorecsence." Applied Physics Letters 92(8):Art. No. 083308.  doi:10.1063/1.2885117
  • Sapochak LS, AB Padmaperuma, X Cai, JL Male, and PE Burrows. 2008. "Inductive effects of diphenylphosphoryl moieties on carbazole host materials: Design rules for blue electrophosphorescent organic light-emitting devices." Journal of Physical Chemistry C 112(21):7989-7996. 


  • Sapochak LS, AB Padmaperuma, PA Vecchi, X Cai, and PE Burrows. 2007. "Designing Organic Phosphine Oxide Host Materials Using Heteroaromatic Building Blocks: Inductive Effects on Electroluminescence ." In Proceedings of the SPIE: Organic Light Emitting Materials and Devices XI, vol. 6655, ed. ZH Kafafi; F So.  SPIE Press, Bellingham, WA.  doi:10.1117/12.740970


  • Burrows PE, AB Padmaperuma, LS Sapochak, PI Djurovich, and ME Thompson. 2006. "Ultraviolet Electroluminescence and Blue-Green Phosphorescence using an Organic Diphosphine Oxide Charge Transporting Layer." Applied Physics Letters 88:Art. no. 183503.  doi:10.1063/1.2193429
  • Padmaperuma AB, LS Sapochak, and PE Burrows. 2006. "A New Charge Transporting Host Material for Short Wavelength Organic Electrophosphorescence: 2,7-Bis(diphenylphosphine oxide)-9,9-dimethylfluorene." Chemistry of Materials 18:2389-2396. 
  • Sapochak LS, AB Padmaperuma, PA Vecchi, HA Qiao, and PE Burrows. 2006. "Design strategies for achieving high triplet energy electron transporting host materials for blue electrophosphorescence." In Organic Light Emitting Materials and Devices X. Proceedings of SPIE, vol. 6333, ed. Zakya H. Kafafi and Franky So, pp. 57-69.  International Society for Optical Engineering: SPIE, Bellingham.  doi:10.1117/12.684126
  • Vecchi PA, AB Padmaperuma, HA Qiao, LS Sapochak, and PE Burrows. 2006. "A Dibenzofuran-Based Host Material for Blue Electrophosphorescence." Organic Letters 8(19):4211-4214.  doi:10.1021/ol0614121

Energy and Environment

Core Research Areas