Blue-hazard-free Candlelight OLED

📖 Top 50% JournalApr 1, 2017Journal of visualized experiments : JoVE

Candlelight OLED Screen Without Harmful Blue Light

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Abstract

The wet-processed OLED achieved a maximum retinal exposure limit of 7,092 seconds at a brightness of 500 lx.

A low correlated color temperature (CCT) of 1,922 K was produced by the wet-processed OLED.
The device demonstrated a relative melatonin suppression sensitivity of 1.05%, significantly lower than traditional LED and CFL lighting.
The dry-processed OLED had a maximum retinal exposure limit of 1,287 seconds at a brightness of 500 lx.
Melatonin suppression sensitivity was measured at 2.61% for the dry-processed OLED relative to 480 nm blue light.
The wet-processed OLED achieved a power efficiency of 30 lm/W, outperforming incandescent bulbs and candles.

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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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