P‐91: Enabling a Low Circadian Rhythm Impact Lighting on Basis of Candle Light Giving OLEDs

Jou, Jwo‐Huei; Kumar, Sudhir; An, Chih-Chia; Chen, Szu-Hao; Shih, Sheng-Hsu; Lin, Shaw‐Tao

doi:10.1002/sdtp.10047

Cited by 2 publications

(3 citation statements)

References 11 publications

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“…Candles can yield pleasant light with a little blue emission, , which might help prevent numerous blue hazards. − Candlelight is perfectly continuous in spectrum, free of ultraviolet radiation, and high in color rendition, , making candles an ideal illumination measure. However, they are not quite suitable for general lighting due to the fact that they are not energy-efficient and, worst of all, release greenhouse gases and PM 2.5 particles. − A proper substitute is hence highly desirable to mimic the pleasant color of candles while eliminating all the fatal drawbacks.…”

Section: Introductionmentioning

confidence: 99%

Flexible Candlelight Organic LED on Mica

Chen

Weng

et al. 2022

ACS Appl. Electron. Mater.

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Candlelight-style, blue hazard-free light sources have been long desired in order to minimize the threats of blue emission on human health, artifacts, ecosystems, and night skies. Flexible light sources can enable numerous innovative products that are wearable, rollable, foldable, and portable. If also transparent, more applications including smart displays, lighting, signage, etc., can be implemented. However, current flexible lighting sources have issues like the use of environmentally unfriendly materials and poor lifetimes. Here, we show the fabrication and lifetime study of a candlelight-style organic light-emitting diode (LED) on high-flexibility, transparent mica that is 100% plastic-free. We found that the mica substrate coated with a transparent conductor survived a record-high bending curvature, i.e., 1/5 mm–1 and 50,000 bending cycles at a 7.5 mm bending radius. The candlelight organic LED fabricated thereon showed a good lifetime that is 83% of that on glass. The blue light-less emission permits at 100 lx an exposure limit of 47,000 s, while the exposure limit is 320 s for a cold-white counterpart; upon exposure at night for 1.5 h, it suppresses 1.6% melatonin, while 30% melatonin is suppressed for the cold-white counterpart. Our results demonstrate how blue hazard-free lighting sources are fabricated on eco-friendly mica that is highly flexible, and the resultant device showed a lifetime approaching that on glass due to its high resistance against moisture and oxygen penetration. The findings suggest that mica can be a good candidate for flexible transparent devices. We expect that these could bring up opportunities to promote omnifriendly lighting applications with a higher degree of design flexibility.

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Section: Introductionmentioning

confidence: 99%

Flexible Candlelight Organic LED on Mica

Chen

Weng

et al. 2022

ACS Appl. Electron. Mater.

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“…Circadian lightings that require color shift from warm to cool white may instead utilize color tunable LEDs for facile fabrication. 7,8 Thus, various approaches have been developed for tuning the emission spectrum of LEDs, such as stacked tandem structure, 9 voltage dependence emission, 10−12 and alternating current (AC) driven light emitting devices. 13 However, the tandem structure composed of separate RGB driving units requires complex electrode connections, whereas the voltage dependent color control has several drawbacks such as recombination zone shifts, uncontrollable exciton quenching, and intensity change while shifting the emission spectrum.…”

mentioning

confidence: 99%

“…Color tunable light emitting devices (LEDs) provide numerous advantages for displays , and lightings. , Color tunable LEDs covering the full visible spectrum reduce a significant amount of process complexity required for side-by-side RGB pixels, , a major challenge facing modern microdisplay technology. Circadian lightings that require color shift from warm to cool white may instead utilize color tunable LEDs for facile fabrication. , Thus, various approaches have been developed for tuning the emission spectrum of LEDs, such as stacked tandem structure, voltage dependence emission, − and alternating current (AC) driven light emitting devices . However, the tandem structure composed of separate RGB driving units requires complex electrode connections, whereas the voltage dependent color control has several drawbacks such as recombination zone shifts, uncontrollable exciton quenching, and intensity change while shifting the emission spectrum.…”

mentioning

confidence: 99%

A Color-Tunable Alternating Current Organic Light Emitting Capacitor

et al. 2023

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We demonstrate an alternating current (AC) driven light emitting capacitor in which the color of the emission spectra can be changed via an applied AC frequency. The device has a simple metal-oxide-semiconductor (MOS) capacitor structure with an organic emissive layer, enabling facile fabrication processing. The organic emissive layer comprises a thin, submonolayer low energy dye layer underneath a thick host matrix (∼30 nm) with higher energy emitting dyes. The emission of the lower energy dyes dominates at low frequency, while the higher energy emission of the host matrix dominates at high frequency. This simple color tunable device could be used for full-color displays and lighting in the future.

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P‐91: Enabling a Low Circadian Rhythm Impact Lighting on Basis of Candle Light Giving OLEDs

Abstract: Abstract

Cited by 2 publications

References 11 publications

Flexible Candlelight Organic LED on Mica

Flexible Candlelight Organic LED on Mica

A Color-Tunable Alternating Current Organic Light Emitting Capacitor

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