US Army researchers are exploring a new class of light-absorbing and light-emitting materials that could eventually support technologies ranging from sensitive chemical sensors to on-site fuel production.
The work brings together scientists from the US Army Combat Capabilities Development Command’s Army Research Laboratory (ARL), the Virginia Military Institute (VMI), and the US Military Academy.
Published in the American Chemical Society journal Inorganic Chemistry, the research focuses on iridium-based chromophores, molecules that can absorb and emit light in predictable ways.
Rather than relying on traditional trial-and-error chemistry, the team combined computational modeling with laboratory synthesis to predict how the molecules would behave before producing them.
The approach uses Hammett parameters to systematically tune the optical properties of iridium complexes through a process known as orbital decoupling.
“Our design strategy … represents a superior methodology compared to traditional trial-and-error processes and is applicable across various classes of materials,” said Dr. Thomas Rohrabaugh, a scientist at the ARL.
“Ultimately, this pushes the field of transition metal photophysics forward in a meaningful way, paving a path for next-generation materials of interest to the Army.”
Shaped by Long-Term Collaboration
The research grew out of the Senior Military College Faculty Fellowship Research Program, which turned an initial outreach effort into a multi-year collaboration between ARL and VMI.
The program brought VMI Professor Dan Harrison and Assistant Professor Caleb Brown into ARL’s Power and Energy Sciences Division, where they worked alongside army researchers on the design and testing of iridium-based chromophores.
Their expertise in synthetic and computational chemistry complemented ARL’s capabilities in studying how the materials absorb and emit light, helping the team move from molecular design to laboratory testing.
“The publication demonstrates that sustained collaboration between ARL and VMI produces research that is both scientifically rigorous and mission-relevant,” Rohrabaugh added.
“When those strengths are combined over multiple years… the result is a pipeline of new materials, new methodologies, and new scientific insights that neither institution could generate alone.”
