Printable candlelight-style organic light-emitting diode

Jou, Jwo‐Huei; Singh, Meenu; Song, Wei-Chi; Liu, S H

doi:10.1088/1757-899x/215/1/012022

Cited by 6 publications

(8 citation statements)

References 9 publications

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“…The white lighting sources with high color temperature consist of blue light enriched emission, responsible for blue hazards especially at dawn-, dusk-, and night-time, that may lead to serious human health disorders such as retinal cell damage and melatonin suppression, increasing insomnia, obesity, or even cancer risk [1][2][3][4][5][6][7][8][9][10]. Moreover, blue-emission can cause ecological disruptions as well as discoloring well-known paintings [11,12].…”

Section: Introductionmentioning

confidence: 99%

“…Jou and co-workers were one of the first to report a psychologically friendly organic LED lighting device with a power efficacy (PE) of 11.9 lm/W at 100 cd/m 2 and external quantum efficiency (EQE) of 6.4% [18]. In 2017, they reported a low-cost solutionprocessable organic LED with a power efficacy of 7.2 lm/W at a low-color temperature of 1807 K [2]. There have been extensive research efforts to develop next generation-al human-friendly low color temperature devices.…”

Section: Introductionmentioning

confidence: 99%

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Highly Efficient Candlelight Organic Light-Emitting Diode with a Very Low Color Temperature

et al. 2021

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Low color temperature candlelight organic light-emitting diodes (LEDs) are human and environmentally friendly because of the absence of blue emission that might suppress at night the secretion of melatonin and damage retina upon long exposure. Herein, we demonstrated a lighting device incorporating a phenoxazine-based host material, 3,3-bis(phenoxazin-10-ylmethyl)oxetane (BPMO), with the use of orange-red and yellow phosphorescent dyes to mimic candlelight. The resultant BPMO-based simple structured candlelight organic LED device permitted a maximum exposure limit of 57,700 s, much longer than did a candle (2750 s) or an incandescent bulb (1100 s) at 100 lx. The resulting device showed a color temperature of 1690 K, which is significantly much lower than that of oil lamps (1800 K), candles (1900 K), or incandescent bulbs (2500 K). The device showed a melatonin suppression sensitivity of 1.33%, upon exposure for 1.5 h at night, which is 66% and 88% less than the candle and incandescent bulb, respectively. Its maximum power efficacy is 23.1 lm/W, current efficacy 22.4 cd/A, and external quantum efficiency 10.2%, all much higher than the CBP-based devices. These results encourage a scalable synthesis of novel host materials to design and manufacture high-efficiency candlelight organic LEDs.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Highly Efficient Candlelight Organic Light-Emitting Diode with a Very Low Color Temperature

et al. 2021

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“…The device exhibited a much lower CCT as compared to the incandescent bulb (2,300 K), while its power efficiency was not acceptable from an energy-saving point of view. They reported another dry-processed candlelight-style OLED by using double emissive layers along with a carrier modulation layer 18 . It exhibited a low CCT of 1,970 K and a power efficiency of 24 lm/W.…”

mentioning

confidence: 99%

“…Recently, Jou's group has fabricated a high-efficiency candlelight-style OLED by employing double emissive layers 21 . It exhibited a high power efficiency of 85.4 lm/W with a CCT of 2,279 K. Until now, all efforts have been made to develop high efficiency, low CCT candlelight-style OLED devices by utilizing dry processes and complicated device architectures 17,18,19,20,21,22 . Devising a candlelight OLED with wet-process feasibility while simultaneously having a low CCT, a high power efficiency, and a high light quality is a challenge.…”

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confidence: 99%

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Blue-hazard-free Candlelight OLED

Jou

Singh

et al. 2017

JoVE

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A candlelight-style organic light emitting diode (OLED) is a human-friendly type of lighting because it is blue-hazard-free and has a low correlated color temperature (CCT) illumination. The low CCT lighting is deprived of high-energy blue radiation, and it can be used for a longer duration before causing retinal damage. This work presents the comprehensive protocols for the fabrication of blue-hazard-free candlelight OLEDs. The emission spectrum of the OLED was characterized by the maximum exposure time limit of the retina and the melatonin suppression sensitivity. The devices can be fabricated using dry and wet processes. The dry-processed OLED resulted in a CCT of 1,940 K and exhibited a maximum retinal exposure limit of 1,287 s at a brightness of 500 lx. It showed 2.61% melatonin suppression sensitivity relative to 480 nm blue light. The wet-processed OLED, where the spin coating is used to deposit hole injection, hole transport, and emissive layers, making fabrication fast and economical, produced a CCT of 1,922 K and showed a maximum retinal exposure limit of 7,092 at a brightness of 500 lx. The achieved relative melatonin suppression sensitivity of 1.05% is 86% and 96% less than that of the light emitting diode (LED) and compact fluorescent lamp (CFL), respectively. Wet-processed blue-hazard-free candlelight OLED exhibited a power efficiency of 30 lm/W, which is 2 times that of the incandescent bulb and 300 times that of the candle.

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Solution-processable hole-transporting materials for organic light-emitting diodes

Xu,

Lin

2024

Solution-Processed Organic Light-Emitting Devices

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Printable candlelight-style organic light-emitting diode

Cited by 6 publications

References 9 publications

Highly Efficient Candlelight Organic Light-Emitting Diode with a Very Low Color Temperature

Highly Efficient Candlelight Organic Light-Emitting Diode with a Very Low Color Temperature

Blue-hazard-free Candlelight OLED

Solution-processable hole-transporting materials for organic light-emitting diodes

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