Soft Ceramic LED Phototherapy Mask and Its Application

Abstract

Researchers have created optical masks using RGB LEDs to achieve the goal of facial skincare; among them, red light stimulates blood circulation, green light enhances endocrine functions, and blue light has antibacterial properties [1-3]. The current mask products are rigid in nature. Apart from being cumbersome, their design results in a distance of about 5 to 10 centimeters between the light source and the skin, causing uneven light distribution on the skin and posing a risk of eye damage due to direct exposure. Therefore, we propose the development of a flexible optical mask using a composite precision ceramic thermal-conductive material. This mask is soft and lightweight like silk, and it can snugly adhere to the facial skin through three-dimensional cutting, much like fabric. On each LED, a silicone lens with a refractive index of 1.4 is applied, increasing the LED’s emission angle from 130° to 150°, thus achieving the most uniform distribution of light and eliminating the drawbacks of direct eye exposure. The high thermal-conductive ceramic material within the mask elevates its thermal conductivity coefficient to 2W/meK, ensuring the even distribution of accumulated heat and uniformly heating the facial skin. Finally, through microscopic imaging of fingertip nail capillaries, we discovered that the use of the optical mask results in a 4.2-fold increase in microvascular flow velocity within 2 to 3 seconds, confirming its highly effective metabolism-enhancing effect.