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

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

Selected publications

1. 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
2. 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
3. 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
4. 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

For a full list, see: Google Scholar | ResearchGate | Scopus | ORCID

Patents

Z. Wang, J. Ha, Y. H. Kim, W. B. Im, J. Mckittrick, S.P. Ong, “Mining unexplored chemistries for phosphors for high-color-quality white-light-emitting diodes,” US Patent, WO 2019/075469 A1, Publication Date: 04/18/2019

• 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

Memberships

American Ceramics Society

Professional services

Reviewer, American Ceramics Society 2016-2019