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Download fileParallel-Stacked Flexible Organic Light-Emitting Diodes for Wearable Photodynamic Therapeutics and Color-Tunable Optoelectronics
journal contribution
posted on 2020-11-06, 11:30 authored by Yongmin Jeon, Ilkoo Noh, Young Cheol Seo, Jun Hee Han, Yongjin Park, Eun Hae Cho, Kyung Cheol ChoiDeformable
organic light-emitting diode (OLED) based optoelectronic
devices hold promise for various wearable applications including biomedical
systems and displays, but current OLED technologies require high voltage
and lack the power needed for wearable photodynamic therapy (PDT)
applications and wearable displays. This paper presents a parallel-stacked
OLED (PAOLED) with high power, more than 100 mW/cm2, at
low voltage (<8 V). The current dispersion ratio can be tuned by
optimizing the structure of the individual OLEDs stacked to create
the PAOLED, allowing control of the PAOLED’s wavelength shapes,
current efficiency, and power. In this study, a fabricated PAOLED
operated reliably for 100 h at a high power of 35 mW/cm2. Confirming its potential application to PDT, the measured singlet
oxygen generation ratio of the PAOLED was found to be 3.8 times higher
than the reference OLED. The high-power PAOLED achieved a 24% reduction
in melanoma cancer cell viability after a short (0.5 h) irradiation.
In addition, a white light PAOLED with color tuning was realized through
OLED color combination, and a high brightness of over 30 000
cd/m2 was realized, below 8.5 V. In conclusion, the PAOLED
was demonstrated to be suitable for a variety of low-voltage, high-power
wearable optoelectronic applications.
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3.8 timeswearable applications8.5 Vmelanoma cancer cell viabilitylight-emitting diodewearable optoelectronic applicationsparallel-stacked OLEDreference OLEDOrganic Light-Emitting DiodesColor-Tunable Optoelectronics Defor...Wearable Photodynamic TherapeuticsOLED technologies30 000PDTsinglet oxygen generation ratiodispersion ratiowearable photodynamic therapylight PAOLEDOLED color combinationwearable displays100 hoptoelectronic devices