Taiwan's National Tsing-Hua University (NTHU) Professor Jou and Dr. Wen have been developing OLED lighting technologies for many years, focusing on healthy bluelight-free OLEDs (so-called candle-light OLEDs) due to the hazards of modern lighting.
The researchers now report they have developed a new tandem-OLED device that improves the efficiency and lifetime of their candle-light OLEDs. The OLED's emission is totally blue-light free, which makes it even safer compared to NTHU's first-gen candle-light OLEDs.
The new OLED devices has a very low color temperature at 1,500 K - lower than that of actual candles (1,900 K). The researchers say it is 15 times more human eye-friendly and 30% more melatonin generation-friendly than a candle. The lifetime of the device is rated at 40,000 hours @ 1,000 cd/m2.
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