The soft, pliable feel of plastic wrap and vinyl flooring comes from a class of additives called plasticizers. Researchers at the University of Chicago have now borrowed that trick for a very different job: making light-emitting polymer films brighter and stretchier at the same time. The result, described by the university and published in Nature Communications, points to a simple route toward displays that can bend with a wrist, a sleeve, or a robot’s skin.
According to the UChicago News account of the work from the Pritzker School of Molecular Engineering (UChicago PME), the approach replaces elaborate new chemistry with a mixing step. That matters because stretchable screens have long forced a trade-off between softness and brightness.
The problem with stretchy light-emitters
Stretchable organic light-emitting diodes (OLEDs) are attractive for wearable electronics, humanoid robots, and three-dimensional displays. The difficulty is that materials that stretch well tend to emit light poorly, and bright emitters tend to crack when pulled.
The UChicago PME lab of Sihong Wang has worked on stretchable polymers based on thermally activated delayed fluorescence, or TADF, which are far more efficient than conventional emitters. But when these polymers sit tightly packed in a film, neighboring units interfere with one another. Their energy cancels out before any light escapes, an effect known as concentration quenching.
The team suspected that adding small gaps between polymer chains could fix two problems at once: reduce the quenching and let chains slide past each other when the film is stretched, the same logic that makes plasticizers soften everyday plastics.
A common additive, tested in a new place
To check the idea, undergraduate researcher Glingna Wang blended dioctyl phthalate (DOP), a plasticizer widely used in vinyl, into the TADF polymer films. In the university’s words, other groups had shown plasticizers could add some stretchability, but no one had tried them in light-emitting polymers before.
The numbers reported by UChicago are striking:
- Fluorescence efficiency rose from 60% for the untreated film to nearly 100%, close to the theoretical maximum.
- Crack-onset strain, the point where the film starts to crack, climbed from 5% to more than 110%.
- In working OLED devices, plasticized films delivered a 35% efficiency improvement over devices without DOP.
Just as important, the effect was not a one-off. When the team added DOP to four other TADF polymers with different chemical structures, all of them improved in both efficiency and stretchability.
Why a physical method is appealing
Most strategies for stretchable emitters require chemists to design and synthesize a custom molecule for each new material. That is slow and expensive, and results rarely transfer from one polymer to the next.
Sihong Wang, the senior author, describes the new method as one where you simply mix two things together, one of them a commercially available additive used for decades. If it holds up beyond the lab, it could give materials developers a general-purpose tuning knob rather than a one-material fix.
The paper’s citation, listed by UChicago as Wang et al., Nature Communications, May 22, 2026, carries the title “Approaching-unity PLQY and high stretchability in polymer emitters via molecular spacers.” Funding came from sources including a National Science Foundation CAREER Award and the U.S. National Institutes of Health, according to the release.
What it means
For product makers, the practical hope is displays and indicator lights that survive repeated bending without losing brightness: watch bands that show information across the wrist, soft electronics that conform to the body, and coverings for robots. Wang has described stretchable OLEDs as one piece of a larger vision of body-compatible electronics that can sense, compute, and communicate on or near the body, alongside the lab’s earlier stretchable computing patches and biosensors.
It is still early. The reported results are laboratory films and test devices, not products, and the university says the team is continuing to build the new emitters into display arrays and exploring their use in optical therapies and light-based biomedical devices. Questions such as long-term stability, manufacturing at scale, and the choice of additive for consumer products are not addressed in the release. This article is news coverage of research, not guidance about any medical use.
There is also a human angle worth noting: the project was led by an undergraduate in the class of 2025, who became first author and has since started a Ph.D. program to continue studying biomedical applications of electronics.
How this fits the wearable display race
Wearable makers have spent years chasing screens that tolerate motion. Rigid panels crack on joints, and many stretchable prototypes dim as they are pulled. A route that raises efficiency while also raising stretchability attacks both complaints at once, and brighter emitters generally mean less battery drain for the same visible output.
The additive angle is also notable for what it avoids. DOP is already produced at industrial scale, so teams would be adjusting a recipe rather than waiting for a new compound to be invented and manufactured. Whether DOP itself suits consumer products is a separate question the university does not address, and other spacer molecules may turn out to work too.
The research team plans to keep going. UChicago says it is incorporating the emitters into display arrays, which is the step that will show whether pixel-level performance survives real patterning, encapsulation, and repeated flexing.
Bottom line
By mixing a decades-old plastic softener into light-emitting polymers, UChicago PME researchers report films that are both nearly perfectly efficient and stretchable beyond 110%. If the method scales, it could shorten the path from lab polymer to bendable display on a wearable. For now, it is a promising materials result worth watching.