03/2013 till now  Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun,   P. R. China.Professor

　　01/2011-01/2013   Department of Macromolecular Science and Engineering, Case Western Reserve University, USA.  Research Associate

　　01/2009-12/2010   Department of Material Science and Engineering, University of California, Los Angeles, USA.  Postdoctor

　　03/2007-12/2008   Institute of Organic Chemistry, University of Würzburg, Germany.  Alexander von Humboldt Fellow

　　09/2001-01/2007   Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, P. R. China.  Ph. D. in Polymer Chemistry and Physics

　　09/1997-06/2001   Department of Chemistry, Wuhan University, P. R. China.  B. Sc. in Chemistry

　　1.Conjugated Polymers for Polymer Solar Cells (PSCs) 

　　Polymer solar cells (PSCs), in which a polymer electron donor and an electron acceptor material are blended and sandwiched between a cathode and an anode, is a promising photovoltic technology because of its great advantage of solution processing and low cost. We are developing novel polymer electron donor and polymer electron acceptor aiming at good photovoltaic performance. In particular, we are interested in polymer electron acceptor materials based on B←N unit. 

　　2. Solution-Processed Graphene Derivatives as Electrode Buffer Layers in PSCs 

　　The interfaces between the active layer and the cathode/anode in PSC devices play an important role on the device performance. We are developing solution-processed graphene derivetives, e.g. graphene oxide, graphene nanoribbon, graphene quantum dots, to be used as efficient cathode/anode buffer layer in PSCs.   

　　3. White Light-Emitting Polymers 

　　White polymer light-emitting diodes (WPLEDs) can be used in both full-color display and lighting applications. WPLEDs are always realized by using polymer blends as active layer, which suffer from color instability. We have proposed the strategy to use a single polymer to emit white light and have developed a family of white light-emitting polymers with high electroluminescence efficiency. 

The Young-1000 Talent Plan of China (2013)

The Excellent Doctor Dissertation of China (2009)

The Excellent Doctor Dissertation of Chinese Academy of Sciences (2008)

Alexander von Humboldt Fellowship (2007)

The Excellence Award of Chinese Academy of Sciences (2006)

　 After joining CIAC as a Principle Investigator in 2013

　　1. Z. C. Ding, J. Liu*, L. M. Dai*, et al., Few-Layered Graphene Quantum Dots as Efficient Hole-Extraction Layer for High-Performance Polymer Solar Cells, Nano Energy, 2015, in press.

　　2. C. D. Dou, J. Liu*, et al., Developing Conjugated Polymer with High Electron Affinity via Replacing a C-C Unit by a B←N Unit, Angew. Chem. Int. Ed., 2015, 54, 3648. (Highlighted as Inside Cover and Selected as Hot Paper by Angew. Chem. Int. Ed.)

　　3. B. Meng, J. Liu*, L. X. Wang*, et al., Phosphonated Conjugated Polymers for Polymer Solar Cells with Non-Halogenated Solvent Process, Polym. Chem., 2015, 26, 805.

　　4. J. Liu*, L. M. Dai*, et al., Graphene Oxide Derivatives as Hole- and Electron-Extraction Layers for High-Performance Polymer Solar Cells, Energy Environ. Sci., 2014, 7, 1297.

　　5. J. Liu, L. M. Dai*,et al., Graphene Oxide Nanoribbon as Hole Extraction Layer to Enhance Efficiency and Stability of Polymer Solar Cells, Adv. Mater., 2014, 26, 786.

　　6. L. Zhang, J. Liu*, et al., Rationally Designed Surfactants for Few-Layered Graphene Exfoliation: Ionic Groups Attached to Electron-Deficient pi-Conjugated Unit through Alkyl Spacers, ACS Nano, 2014, 8, 6663.

　　7. B. Meng, J. Liu*, L. X. Wang*, et al., Phosphonate-Functionalized Donor Polymer as an Underlying Interlayer to Improve Active Layer Morphology in Polymer Solar Cells, Macromolecules, 2014, 47, 6246.

　　Before joining CIAC

　　1. J. Liu, L. M. Dai*, et al., Hole and Electron Extraction Layers Based on Graphene Oxide Derivatives for High-Performance Bulk Heterojunction Solar Cells, Adv. Mater., 2012, 24, 2228. (Highlighted with Frontispiece by Adv. Mater.)

　　2. J. Liu, L. M. Dai*, et al., Highly Crystalline and Low Bandgap Donor Polymers for Efficient Polymer Solar Cells, Adv. Mater., 2012, 24, 538.

　　3. J. Liu, L. M. Dai*, et al., Sulfated Graphene Oxide as a Hole-Extraction Layer in High-Performance Polymer Solar Cells, J. Phys. Chem. Lett., 2012, 3, 1928.

　　4. J. Liu, L. M. Dai*, et al., Graphene Materials for Energy-Related Application, MRS Bulletin, 2012, 37, 1265.

　　5. Y. H. Xue, J. Liu, L. M. Dai*, et al., Nitrogen-Doped Graphene Foams as Metal-Free Counter Electrodes in High-Performance Dye-Sensitized Solar Cells, Angew. Chem. Int. Ed., 2012, 51, 12124. (Highlighted as Back Cover of Angew. Chem. Int. Ed. 2012, Vol 51, Issue 48)

　　6. J. Liu, Q. B. Pei*, et al., Conjugated Polymer as Host for High Efficiency Blue and White Electrophosphorescence, Macromolecules, 2011, 44, 2451.

　　7. J. Liu, Q. B. Pei*, et al., Ambipolar Poly(meta-phenylene) Copolymer with High Triplet Energy as Host for Blue and Green Electrophosphorescence, J. Mater. Chem., 2011, 21, 9772.

　　8. J. Liu, Q. B. Pei*, et al., Poly(meta-phenylene): Conjugated Polymer Host with High Triplet Energy for Efficient Blue Electrophosphorescence, Macromolecules, 2010, 43, 9608.

　　9.  J. Liu, Q. B. Pei*, et al., Electrophosphorescent Polymers for High- Efficiency Light-Emitting Diodes, Curr. Org. Chem., 2010, 14, 2133.

　　10. J. Liu, L. X. Wang*, et al., White Electroluminescence from a Star-Shaped Like Polymer with an Orange Emissive Core and Four Blue Emissive Arms, Adv. Mater., 2008, 20, 1357.

　　11. J. Liu, L. X. Wang*, et al., Novel White Electroluminescent Single Polymer Derived from Fluorene and Quinacridone, Macromolecules, 2008, 41, 1162.

　　12. J. Liu, L. X. Wang*, et al., Highly Efficient Red Electroluminescent Polymers with Dopant/Host System and Molecular Dispersion Feature: Polyfluorene as the Host and 2,1,3-Benzothiadiazole Derivative units as the Red Dopants, J. Mater. Chem., 2008, 18, 319.

　　13. J. Liu, L. X. Wang*, et al., Blue Electroluminescent Polymers with Dopant/Host System and Molecular Dispersion Feature: Polyfluorene as the Deep-blue Host and 1,8-Naphthalimide Derivative Units as the Light-blue Dopants, J. Mater. Chem., 2008, 18, 1659.

　　14. J. Liu, L. X. Wang*, et al., Molecular Design on Highly Efficient White Electroluminescence from a Single Polymer System with Simultaneous Blue, Green and Red Emission, Adv. Mater., 2007, 19, 531.

　　15. J. Liu, L. X. Wang*, et al., White Electroluminescence from a Single Polymer System: Improved Performance by Means of Enhanced Efficiency and Red-Shifted Luminescence of the Blue-Light-Emitting Species, Adv. Mater., 2007, 19, 1859.

　　16. J. Liu, L. X. Wang*, et al., Three-Color White Electroluminescence from a Single Polymer System with Blue, Green and Red Dopant Units as Individual Emissive Species and Polyfluorene as Individual Polymer Host, Adv. Mater., 2007, 19, 4224.

　　17. J. Liu, L. X. Wang*, et al., White Electroluminescence from a Single-Polymer Systemwith Simultaneous Two-Color Emission: Polyfluorene as Blue Hostand 2,1,3-Benzothiadiazole Derivatives as Orange Dopantson the Side Chain, Adv. Funct. Mater., 2007, 17, 1917.

　　18. J. Liu, L. X. Wang*, et al., Green Light-Emitting Polyfluorenes with Improved Color Purity Incorporated with 4,7-Diphenyl-2,1,3-Benzothiadiazole Moieties, J. Mater. Chem., 2007, 17, 2832.

　　19. J. Liu, L. X. Wang*, et al., White Electroluminescence from a Single Polymer System with Simultaneous Two Color Emission: Polyfluorene as Blue Host and 2,1,3-Benzothiadiazole Derivative Unit as Orange Dopant on the Main Chain, Adv. Funct. Mater., 2006, 16, 957. (Highlighted as Front Cover of Adv. Funct. Mater.)

　　20. J. Liu, L. X. Wang*, et al., Blue Light-Emitting Polymer with Polyfluorene as the Host and Highly Fluorescent 4-Dimethylamino-1,8-Naphthalimide as the Dopant in the Side Chain, Appl. Phys. Lett., 2006, 88, 083505.

　　21. J. Liu, L. X. Wang*, et al., Highly Efficient Green Light Emitting Polyfluorene Incorporated with 4-Diphenylamino-1,8-Naphthalimide as Green Dopant, J. Mater. Chem., 2006, 16, 1431. (Selected as Hot Paper by J. Mater. Chem. and Highlighted by Chem. Technol. (Chem. Technol. 2006, 3, T13))

　　22. J. Liu, L. X. Wang*, et al., The First Single Polymer with Simultaneous Blue, Green, and Red Emission for White Electroluminescence, Adv. Mater., 2005, 17, 2974. (Highlighted by Nature in 2005 (Nature, 2005, 438, 892) and by Nature China in 2007).

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