Biography
Research interests
- Sol-gel chemistry of glass inks development for additive manufacturing
- Synthesis optic fiber materials
- Polishing and surface chemistry of optics
- Phosphors design and wet chemical synthesis of ceramics
- Design and synthesis of inorganic-organic hybrid nanomaterials
Current position(s)
- Staff Scientist
Career path
- 2019 – 2021, Postdoctoral Researcher at Lawrence Livermore National Laboratory
Highlights
https://str.llnl.gov/2023-01/dyllaspears
https://jacobsschool.ucsd.edu/news/release?id=2476
https://phys.org/news/2018-02-aid-discovery-inexpensive-material-high.html
Subject Matter Expertise
- Glass optics
- Optic fiber materials
- Additive Manufacturing
- Phosphors
- Organic-inorganic hybrid materials
Education
- Ph.D., Materials Science and Engineering, University of California San Diego, 2019
- M. S., Fuel Cell and Hydrogen Technology, Hanyang University, Republic of Korea, 2012
- B. S., Chemical Engineering, Hanyang University, Republic of Korea, 2010
Publications
2022 2 publications
- J. Ha, K. Sasan, T. D. Yee, A. Lange, Du. Nguyen, Christ Mah, Ryan Gini, Rebecca Dylla-Spears, “Tunning of refractive index and Abbe number via 3D printing of silica-titania-germania glasses”, Advanced photonics Research, 2022, 2200017. https://doi.org/10.1002/adpr.202200017
- A. Lange, K. Sasan, L. B. B. Aji, T. D. Yee, J. Ha, G. Remulla, R. Ryerson, C. Mah, T. Suratwala, R. Dylla-Spears, “Mass transport in binary TiO2:SiO2 and GeO2:SiO2 direct ink write glasses”, Journal of American Ceramic Society, 2022, 1-10. https://doi.org/10.1111/jace.18422
2019 1 publication
- J. Ha, Y. H. Kim, E. Novistskaya, M. Sanchez, Z. Wang O. A. Graeve, W. B. Im, S. P. Ong, J. McKittrick, “Color tunable single-phase Eu2+ and Ce3+ co-activated Sr2LiAlO4 phosphors”, Journal of Materials Chemistry C, 2019, 7, 7734-7744. https://doi.org/10.1039/C8TC05777J
2018 1 publication
- Z. Wang*, J. Ha*, Y. H. Kim*, W. B. Im, Joanna McKittrick, Shyue Ping Ong, “Mining Unexplored Chemistries for Phosphors for High-Color-Quality White-Light-Emitting Diodes”, Joule, 2018,2, 1-13. *contributed equally. https://doi.org/10.1016/j.joule.2018.01.015
Awards
2022 R&D100 Award: Tailored Glass by Direct Ink Writing
2009 Honorable Mention, Capstone Design Fair, Hanyang University.
2009 Excellence Award of Undergraduates thesis, Department of Chemical Engineering, Hanyang University,
2008 Hanyang Fusion Materials (HFM) program scholarship, Republic of Korea
Additional info
Memberships
American Ceramics Society
Professional services
Reviewer, American Ceramics Society 2016-2019