Research Interests

• Design and develop novel inorganic and nano-hybrid materials
  • Synthesis of nano and micron scale inorganic compounds, nanoscale composites/heterostructure inorganic compounds
  • Structural and chemical analysis of inorganic materials
  • Surface functionalization of nanomaterials
• Solid state lighting, phosphors, optical interactions at the interface

Ph.D., Material Science Engineering, University of California, San Diego

M.A., Material Science Engineering, Korea University, Seoul, South Korea

B.S., Material Science Engineering, Korea University, Seoul, South Korea

1. L. Wang, J.K. Han, B. Sundahl, S. Thornton, Y. Zhu, R. Zhou, C. Jaye, H. Liu, Z.Q. Li, G. Taylor, D. Fischer, J. Appenzeller, R. Harrison, S.S. Wong, "Determining the Ligand-induced Dependence of Charge Transfer in Nanotube – Quantum Dot Heterostructure" Chem. Sci (In press)
2. C.S. Lewis, H. Liu, J.K. Han, L. Wang, S. Yue, N.A. Brennan, S. S. Wong, "Probing charge transfer in a novel class of luminescent perovskite-based heterostructures composed of quantum dots bound to RE-activated CaTiO3 phosphors", Nanoscale 8 2129-2142 (2016)
3. J.K. Han, C. McBean, L. Wang, C. Jaye, H. Liu, D.A. Fischer, S.S. Wong "Preparation of single crystallined Eu activated solid solution of Ca(W,Mo)O4 nanowire and investigation of photoinduced optical interactions within 1D Ca(W,Mo)O4:Eu – 0D QDs (QDs = CdS and CdSe) nanoscale heterostructure". J. Phys. Chem. C. 119. 3826-3842 (2015)
4. J.K. Han, C. McBean, L. Wang, J. Hoy, C. Jaye, H. Liu, Z.Q. Li, M.Y. Sfeir, D.A. Fischer, G. Taylor, J.A. Misewich, S.S. Wong "Probing structure-induced optical behavior in a new class of self-activated luminescent 0D/1D CaWO4 metal oxide – CdSe nanocrystal composite heterostructures". Chem. Mater. 27. 778-792 (2015)
5. L. Wang, J.K. Han, Y. Zhu, R. Zhou, C. Jaye, H. Liu, Z.Q. Li, G. Taylor, D. Fischer, J. Appenzeller, S.S. Wong, "Probing the Dependence of Electron Transfer on Size and Coverage in Carbon Nanotube–Quantum Dot Heterostructures", J. Phys. Chem. C. 119. 26327-26338 (2015)
6. J.K. Han, M.E. Hannah, A.Piquette, J. Talbot, K. C. Mishra, J. McKittrick, ""Particle morphology and luminescence properties of green emitting Ba2SiO4:Eu2+ through hydrothermal reaction route," J. Lumin. 161. 20-24 (2015)
7. J.K. Han, L. Wang, S.S. Wong, "Observation of photoinduced charge transfer behavior in novel luminescent CdSe quantum dot – CePO4 : Tb metal oxide nanowire composite heterostructures," J. Phys. Chem. C. 118. 5671-5682 (2014)
8. J.K. Han, M. Hannah, A. Piquette, G.A. Hirata, J.B. Talbot, K.C. Mishra, and J. McKittrick, "Analysis of (Ba, Ca, Sr)3MgSi2O8:Eu2+, Mn2+ phosphors for application in solid state lighting," J. Lumin. 148, 1-5 (2014)
9. L. Wang, J.K. Han, J. Hoy, F. Lu, H. Liu, M.M. Gentleman, M. Y. Sfeir, J. A. Misewich, S.S. Wong, "Probing differential optical and coverage behavior in nanotube-nanocrystal heterostructures synthesized by covalent versus non-covalent approaches," Dalton Trans. 43. 7480-7490 (2014)
10. C.S. Lewis, L. Wang, H. Liu, J.K. Han, S.S. Wong, "Synthesis, Characterization, and Formation Mechanism of Crystalline Cu and Ni Nanowires under Ambient, Seedless, Surfactantless Conditions," Cryst. Growth. Des. 14. 3825-3838 (2014)
11. J.K. Han, L. Wang, S.S. Wong, "Morphology and dopant-dependent optical characteristics of novel composite 1D and 3D-based heterostructures of CdSe nanocrystals and LaPO4: Re (Re = Eu, Ce, Tb) metal oxide nanowires," RSC Advances. 4. 34963-34980 (2014
12. J.M. Patete, J.K Han, A.L. Tiano, H. Liu, M.G. Han, J.W. Simonson, Y. Li, A. Santulli, M.C. Aronson, A. I. Frenkel, Y. Zhu, S.S. Wong "Template-mediated Synthesis and Characterization of One-Dimensional Yttrium Manganese Oxides," J. Phys. Chem. C. 118. 21695-21705 (2014)
13. J.K. Han, M.E. Hannah, A.Piquette, J. Talbot, K. C. Mishra, J. McKittrick, "Eu-activated KSrPO4-(Ba,Sr)2SiO4 solid solutions as efficient and color tunable phosphors for near-UV light emitting diode applications," J. Amer. Ceram. Soc, 96, 1526-1532 (2013)
14. J.K. Han, M.E. Hannah, A. Piquette, J.I. Choi, M. Anc, M. Galvez, H. Lüger, J.B. Talbot, K.C. Mishra, J. McKittrick, "Phosphor development and application for near UV LED solid state lighting," ECS. J. Solid State. Sci. Technol. 2 R3138-R3147(2013)
15. J.K. Han, M. Hannah, A. Piquette, G.A. Hirata, J.B. Talbot, K.C. Mishra, and J. McKittrick, "Europium-activated barium/strontium silicates for near-UV light emitting diode applications," J. Lumin 133 184-187 (2013).
16. J.K. Han, M.E. Hannah, A. Piquette, J.I. Choi, M. Anc, M. Galvez, H. Lüger, J.B. Talbot, K.C. Mishra, J. McKittrick, "Phosphor development and application for near UV LED solid state lighting," ECS. J. Solid State. Sci. Technol. 2 R3138-R3147(2013).
17. J.K. Han, M.E. Hannah, A.Piquette, J. Talbot, K. C. Mishra, J. McKittrick, "Sol-gel synthesis of single phase, high quantum efficiency LiCaPO4:Eu2+ phosphors," ECS. J. Solid. State. Sci. Technol. 1, R37-R40 (2012).
18. J.K. Han, M. Hannah, A. Piquette, J.B. Talbot, K.C. Mishra, and J. McKittrick, "Nano- and submicron sized europium activated silicate phosphors prepared by a modified co-precipitation method," ECS. J. Solid. State. Sci. Technol. 1, R98 (2012).
19. J. McKittrick, J.K. Han, J.I. Choi and J.B. Talbot, "Effect of powder synthesis and processing on luminescence properties," in TMS Proceedings, Materials Processing and Interfaces, Eds. K. Morsi, F.D.S. Marquis, J.L. Meyer and A. El-Desouky, John Wiley & Sons, 1, 497-504 (2012).
20. J.K. Han, G. Hirata, J.B. Talbot, J. McKittrick, "Luminescence enhancement of Y2O3:Eu3+, Y2SiO5:Ce3+, Tb3+ core particles with SiO2 shells," Mater. Sci. Eng> B. 176, 436-441 (2012).

• PhD Fellowships at University of California, San Diego, 2010-2013
• Top entering graduate student in Department of Material Science and Engineering at Korea University, 2006
• Top-honors student, Honor scholarships, 2004-2006