UC Merced Researchers Launch Project to Bring Light-Tuning Materials to Central Valley Greenhouses
UC Merced researchers are launching a project that could change how Central Valley growers harness the sun’s energy, using a family of light-active molecules developed at the university to design smarter agricultural greenhouses.
The Central Valley grows a significant share of the nation’s food but does so under increasing pressure from heat and drought, along with shifting growing seasons. Greenhouse and shade-structure technologies are already part of how growers adapt, and researchers believe a new generation of light-tuning materials can make those structures more productive and efficient.
The work, led by UC Merced chemistry professors Hrant Hratchian and Ryan Baxter and supported by the Fresno–Merced Farms Food Future (F3) Initiative UC Merced iCREATE project (award no. 07 79 07913) builds on several years of fundamental research into compounds that absorb specific wavelengths of light with unusual precision.
Plants do not use all sunlight equally. Photosynthesis is driven mostly by red and blue light, while ultraviolet light can stress crops and degrade the plastics used to make greenhouses. Conventional greenhouse films are largely passive. They may block some UV, but they cannot redirect that energy or be tuned for specific crops, climates, or growing seasons. The UC Merced approach will let future materials do both: absorb UV that would otherwise be wasted or harmful, and convert it into the wavelengths that help plants grow.
Postdoctoral researcher Ali Abou Taka is leading the computational modeling and characterization that will guide the next phase of the project, translating these molecules into materials that can be deployed in the field.
The team has collaborated on developing design principles for small molecules that interact with light in precise, controllable ways. What makes this moment different is that the work is beginning to point toward a tangible product that addresses a problem: visible right outside our windows.
At the heart of the project is a class of “push–pull” chromophores. These molecules are engineered with two halves. One half donates electrons and the other accepts them. That asymmetry gives the molecule its photochemistry. When sunlight hits it, the molecule absorbs a specific slice of ultraviolet light and channels the energy into a controlled molecular transformation, releasing the remaining energy as visible light. By varying a few atoms on either side of the molecule, the UC Merced team can shift the absorption and emission windows across a broad range, effectively providing a design knob for tuning the type of light absorbed and the frequency of light emitted. This scientific discovery provides an exciting pathway toward tunable greenhouse sunlight filters.