Trichogenic Photostimulation Using Monolithic Flexible Vertical AlGaInP Light-Emitting Diodes.

Area of Science:

• Biomedical Engineering
• Materials Science
• Dermatology

Background:

• Alopecia presents aesthetic, psychological, and social challenges.
• Current laser treatments for hair growth are limited by energy consumption, equipment size, and daily usability.
• There is a need for portable and effective hair growth stimulation devices.

Purpose of the Study:

• To develop a wearable photostimulator for hair growth applications.
• To utilize high-performance flexible red vertical light-emitting diodes (f-VLEDs) for enhanced biostimulation.
• To demonstrate the efficacy of f-VLEDs in promoting hair growth.

Main Methods:

• Fabrication of flexible microscale LEDs using a monolithic process.
• Characterization of f-VLEDs for light output, forward voltage, and flexibility.
• Evaluation of trichogenic stimulation in hairless mice using the developed f-VLED device.

Main Results:

• High light output (∼30 mW mm^-2) and low forward voltage (∼2.8 V) achieved with f-VLEDs.
• Excellent flexibility, thermal stability, device uniformity, and mechanical durability demonstrated.
• Successful trichogenic stimulation of hair growth in a mouse model.

Conclusions:

• High-performance red f-VLEDs are suitable for wearable biostimulation applications.
• The developed wearable photostimulator is a promising, portable solution for hair growth.
• This technology addresses the limitations of conventional alopecia treatments.