A groundbreaking wearable device may soon replace traditional bulky phototherapy helmets for hair loss. Researchers have developed a hat-like, flexible phototherapy system using OLED technology, which has been shown to suppress hair-follicle cell aging by up to 92%—a key factor in preventing hair loss.
The project is a collaborative effort led by Professor Kyung Cheol Choi from the School of Electrical Engineering at KAIST and Professor Yun Chi’s team at the Hong Kong University of Science and Technology. Their findings are published in Nature Communications.
Safer Alternatives to Drug-Based Treatments
While drug therapies for hair loss are effective, long-term use often raises concerns about side effects. This has driven growing interest in safer, noninvasive options such as phototherapy. However, conventional devices rely on rigid, helmet-like designs and point light sources, limiting both comfort and the uniformity of light delivery across the scalp.
A Textile-Based OLED Cap
To overcome these limitations, the research team developed a wearable cap embedded with area-emitting OLEDs. Unlike LED or laser point sources, these OLEDs emit light evenly over a wide surface and naturally conform to the scalp’s contours. The flexible, fabric-like design allows users to wear the cap comfortably while receiving uniform optical stimulation across the entire scalp.
Targeting Hair-Follicle Aging with Precision Light
The study focused not only on wearability but also on targeting hair-follicle cell aging—a major driver of hair loss. Using techniques adapted from OLED display technology, the team engineered the device to emit near-infrared (NIR) light in the 730–740 nm range, which optimally activates dermal papilla cells at the base of hair follicles responsible for hair growth.
Laboratory tests on human dermal papilla cells confirmed the device’s efficacy. The NIR OLED irradiation suppressed cell aging by approximately 92% compared to control samples, outperforming conventional red-light therapies.
Next Steps Toward Clinical Use
First author Dr. Eun Hae Cho highlighted the device’s practical advantages: “Instead of rigid, helmet-type devices, we present a wearable phototherapy platform that can be used in daily life. A major outcome of this study is showing that precisely engineered light wavelengths can effectively reduce hair-follicle cell aging.”
Professor Kyung Cheol Choi added, “The thin and flexible OLEDs conform to the scalp’s curves, delivering uniform light stimulation. We plan to conduct preclinical studies to verify safety and gradually explore real-world therapeutic applications.”
This innovative approach represents a significant step toward a more convenient, effective, and noninvasive solution for hair loss, potentially transforming the way millions manage this common condition.
