David Liu

Smiling man with black hair and dark eyes. He is wearing a navy blue button up shirt and tie with a black v-neck sweater over.

Program: Chemistry & Biochemistry Ph.D. Program

Specialization: Inorganic Chemistry

Expected Graduation Date: 2026

Area of Research: Photovoltaic efficiency, LED/Phosphor Efficiency, Ferroelectrics, Battery energy density

Link to Research Profile: https://www.linkedin.com/in/david-liu-4845a8174/

Email: liu.6002@buckeyemail.osu.edu

Why are you interested in sustainable energy solutions? We are amid a climate crisis; one in which swift action must be taken or else humanity's future may be in jeopardy. Seeing climate change's influence on natural disasters and rising sea levels has driven me to pursue a future in sustainable energy solutions. I hope to apply my chemistry experience and my experience in the EmPOWERment program to become a leader in the sustainable energy sector.  

How are your personal history and vision assets to development and research in energy and sustainability? My past experiences and my vision of a sustainable future are what drives my research in energy and sustainability. Throughout my undergrad, I focused on a material called a perovskite, which has many unique properties that include being a phosphor in LEDs, a semiconductor in photovoltaics, etc. My goal was to create a perovskite that is an efficient blue light emitter that may be used in lighting applications. Lighting accounts for 15% of global electricity usage; this problem is primarily due to low efficiency incandescent bulbs, which haven’t changed much since their invention over a century ago. Solid state lighting represents a new, energy efficient alternative. However, current light emitting diodes (LEDs) have deficiencies in the blue spectral region. We discovered that doping a small percentage of bismuth ions into a vacancy ordered cesium hafnium chloride system lead to strong blue light emission when excited by UV light. This was an exciting discovery. The material was efficient and cost effective to produce. Ultimately, the untimely COVID crisis prevented me from completing the project at the end of my undergrad. This past experience gives me further drive and motivation to continue and pursue chemistry research in the means of developing more efficient and sustainable materials

What is your dream job and how will it contribute to a more sustainable energy landscape? After the program, my dream position would be to become a tenure-track research professor at a large university. In this position, I would expect to continue researching new materials that may contribute towards a more sustainable future. This may include energy efficiency and energy storage. I hope these contributions towards academia may elevate the efficiency of future technology. A more direct approach could also include building a start-up to apply my research to real-world applications.

Who are potential key partners for your research? Potential partners for my research may include energy companies that want to fund the development of emergent materials that may increase the efficiency of photovoltaics or lighting applications. Other partners may include other labs or national laboratories that have instruments that are not directly available at the Ohio State University.

Hobbies/Personal Interests: Mountain biking, Snowboarding, Hiking, Weightlifting

double-arrowRelevant Technical Skills:

VESTA, Origin, Excel, Photoshop

double-arrowPublications and Presentations:

Liu, David. "Broadband Blue Emission in Cs2HfCl6 Phosphors." Poster presented at: Denman Undergraduate Research Forum & Meek Lecture Poster Session; Nov 2019; Mar 2020; Columbus, OH.
 
Liu, David. "Broadband Blue Emission in Cs2ZrCl6 Phosphors." Poster presented at: Ohio State Autumn Undergraduate Research Festival; Nov 2019; Columbus, OH