Abstract
Wearable photomedical application fields, such as photobiomodulation (PBM), and photoplethysmography (PPG) sensors using organic light-emitting diodes (OLEDs), are promising and attractive due to their flexibility, surface light emission, and ability to apply to various free-form (attachable or implantable) healthcare platforms. However, to maximize the impact on wearable photomedical applications, their spectrum needs to be freely tunable in real-time, and expanded into the near-infrared (NIR) wavelengths which are difficult to achieve in conventional electroluminescent OLED. In this study, we introduce the wavelength selective quantum dots high-power parallel-stacked OLED (QD-OLED) patch. Several NIR QD-OLEDs with 630, 700, and 730 nm peak wavlength were optimized by the high-power (> 100 mW·cm−2 at 6.3 V) parallel-stacked blue OLED with a 465 nm emission peak.The NIR QD-OLED patch platform with multi-functional blue reflective NIR-enhanced (> 60 %) encapsulation film (6 x 10−6 g/m−2(−|-) day−1), capable of real-time wavelength control, achieved a high-output NIR power density (>23.28 mW·cm−2). Using this NIR QD-OLED patch, PPG bio-signals were successfully measured. Additionally, this NIR QD-OLED demonstrated that it can increase the proliferation of dermal papilla cells by up to 131 % through NIR wavelength control, thereby optimizing the hair growth effect.
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