Transparent Flexible Candlelight OLED

Tun-Hao Chen

doi:10.1021/acsaelm.4c01959

Transparent Flexible Candlelight OLED

2025-03-01

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DOI：10.1021/acsaelm.4c01959

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Excessive exposure to intense blue light could harm retina and disrupt melatonin secretion at night. To solve, a blue light-less candlelight organic light-emitting diode (OLED) was invented in 2012, a festive replacement of hydrocarbon-burning candles. Incorporating further flexibility and transparency could create design freedom and expand its applicability. We demonstrate herein a successful fabrication of a transparent candlelight OLED on a flexible mica. When unpowered, this device exhibits 40% transmittance. Upon applying voltage, both the top and bottom emissions of the device exhibit blue-hazard-free candlelight with a color temperature of 1800 K, which remain unaffected by bending. From retinal protection perspective, the resulting 1800 K color temperature permits, at 100 lx, an exposure limit of 54,900 s, while 404 s for a 4000 K yellow-white counterpart. Upon exposure at night for 1.5 h, it would only suppress 2% melatonin, in contrast of 13% by the yellow-white light. We anticipate this research to open a path for fabricating OLEDs which are transparent, flexible, and omni-friendly.

Keyword:

transparent

flexible

candlelight

OLEDs

mica-substrate

top and bottom emission

Transparent Flexible Candlelight OLED

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