optoelectronic materials scientist
Resume:
Zhihua Xu
Little Neck, NY 11363
*********@*****.***
Summary of Qualifications
• Proficient with synthesis, characterization and applications of organic and inorganic phosphors.
• Extensive experience with fabrication and characterization of optoelectronic devices.
• Thorough knowledge of light-emitting mechanisms, photovoltaic processes, solid state physics, charge injection and transport in semiconductor devices.
• R&D experience in lighting industry.
• A good team worker with self-motivated and well-organized working style.
Expertise
• Material: Phosphors, Organic light-emitting materials, Photovoltaic materials, Wide band-gap Semiconductors, Polymers, Ceramics, Composites, Carbon Nanotubes.
• Characterization: UV-vis absorption, PL and excitation spectra, Temperature dependent measurements, Magnetic measurements, Photometry, FTIR, I-V, PV, EL, SEM, TEM, AFM, TG, DSC, X-ray.
• Synthesis: Sol-gel, Polymerization, Solid-state reaction.
• Thin film deposition: Spin coating, Thermal evaporation, Screen printing, Inkjet printing.
• Device fabrication: Organic light-emitting diodes (OLEDs), Organic photovoltaics (OPVs), Thin-film electroluminescence (TFEL) devices, Organic memory devices, Photodetector.
• Prototype development: OLED lights, solar-powered LED lighting fixtures.
Professional Experience
October 2008-March 2009, Product Engineer, WAC Lighting Co, USA
• Designed and developed a series of solar-powered LED outdoor lighting prototypes.
• Participated in the R&D of decorative OLED lighting project.
• Supervised the Energy Star certification of LED lighting fixtures.
August 2004-Octobor 2008, Research Assistant, University of Tennessee, USA
• Designed and characterized a series of white-light and wavelength-tunable hybrid LEDs based on blue inorganic LEDs and organic phosphor films.
• Successfully applied carbon nanotubes as transparent electrode, hole transporting layer, and doping materials for flexible and robust OLEDs and OPVs.
• Developed a new magnetic field measurement to study the electron-to-photon and photon-to-electron conversion processes in OLEDs and OPVs.
• Improved the performance of OPVs by controlling the singlet and triplet excitons, film morphology and interfaces.
September 2001-July 2004, Research Assistant, Chinese Academy of Sciences, China
• Designed, synthesized and patented a series of red, green and blue phosphors using rare-earth dopants and a metal oxide host material, and proposed the energy transfer mechanisms.
• Synthesized and characterized green and blue nanocrystalline phosphors using a low-temperature, solution-based reaction route, and investigated morphology dependent photoluminescence.
• Fabricated and characterized multicolor inorganic TFEL devices based on the lab-synthesized phosphors and thin films.
August 1996-September 2000, Chemical Process Engineer and Quality Engineer, Sinopec, China
• Provided daily process engineering support to a Polypropene (PP) plant;
• Implemented and documented ISO9001 standards.
Education
• October 2008, Ph.D. in Materials Science and Engineering, University of Tennessee, Knoxville.
• July 2004, M.S. in Materials Science and Engineering, Chinese Academy of Sciences, Shanghai, China.
• July 1996, B.E. in Chemical Engineering, Tianjin University, Tianjin, China.
Patent
• Yongxiang Li, Zhihua Xu, and Dong Wang, “Yttrium gallate based trichromatic fluorescent materials and a method for their fabrication” Chinese Patent, CN 1594498A.
Selected Publications
• Zhihua Xu, Yongxiang Li, Zhifu Liu, and Zhi Xiong, “Low-temperature Synthesis of Nanocrystalline ZnGa2O4:Tb3+ Phosphors via the Pechini Method”, Materials Science and Engineering B 110, 302 (2004).
• Zhihua Xu, Yongxiang Li, Zhifu Liu, and Dong Wang, “UV and X-ray Excited Luminescence of Tb3+-doped ZnGa2O4 Phosphors”, Journal of Alloys and Compounds. 391 202 (2005).
• Zhihua Xu, Yue Wu, Bin Hu, Ilia N, Ivanov, and David B. Geohegan, “Cabon nanotube effects on electroluminescence and photovoltaic response in conjugated polymers” Applied Physics Letters 87, 263118 (2005).
• Zhihua Xu, Yue Wu, and Bin Hu, “Dissociation processes of singlet and triplet excitons in organic photovoltaic cells” Applied Physics Letters 89, 131116 (2006).
• ChengJun Sun, Zhihua Xu, Bin Hu, G. S. Yi, G. M. Chow, and Jian Shen, “Application of NaYF4 : Yb, Er upconversion fluorescence nanocrystals for solution-processed near infrared photodetectors”, Applied Physics Letters, 91, 191113 (2007).
• Zhihua Xu, Bin Hu, and Jane Howe, “Improvement of photovoltaic response based on enhancement of sin-orbital coupling and triplet states in organic solar cells”, Journal of Applied Physics, 103, 043909 (2008).
• Zhihua Xu, Huidong Zang, and Bin Hu, “Solar energy conversion processes in organic solar cells”, JOM 60, 47 (2008). (Invited review paper).
• Zhihua Xu and Bin Hu, “Photovoltaic processes of singlet and triplet excited states in organic solar cells”, Advanced Functional Materials 18, 1 (2008).
Conference Presentations
• “Two emission bands of the ZnGa2O4 phosphor prepared by a heterogeneous precipitation method”, The 8th Asian Symposium on Information Display, Nanjing, China, February 2004.
• “Improvement of photovoltaic response based on spin-orbital coupling increased triplet states in organic solar cells”, Materials Research Society Fall Meeting, Boston, November 2006.
• “Investigation of recombination of dissociated electrons and holes in organic bulk heterojunction solar cells” Materials Research Society Fall Meeting, Boston, November 2007.
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