Candlelight style organic light-emitting diode: a plausibly human-friendly safe night light
| Autor: | Chun-Yu Hsieh, James H. Hong, Po-Wei Chen, Jwo-Huei Jou, Sudhir Kumar |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Incandescent light bulb
Materials science Renewable Energy Sustainability and the Environment business.industry Color temperature Atomic and Molecular Physics and Optics law.invention Color rendering index LED lamp Optics law OLED Optoelectronics Quantum efficiency Candle business Light-emitting diode |
| Zdroj: | Journal of Photonics for Energy. 4:043598 |
| ISSN: | 1947-7988 |
| DOI: | 10.1117/1.jpe.4.043598 |
| Popis: | Candles emit sensationally warm light with a very low color temperature, comparatively most suitable for use at night. In response to the need for such a human-friendly night light, we demonstrate the employment of a high number of candlelight complementary organic emitters to generate and mimic candlelight based on organic light emitting diode (OLED). One resultant candlelight style OLED shows a very-high color rendering index (CRI), with an efficacy at least 300 times that of a candle or at least two times that of an incandescent bulb. The device can be fabricated, for example, by using four candlelight complementary emitters: red, yellow, green, and sky-blue phosphorescent dyes. These dyes, in the present system, can be vacuum deposited into two emission layers that are separated by a nanolayer of carrier modulation material that is used to maximize very high CRI and energy efficiency. A nano carrier modulation layer also played a significant role in maintaining the low blue emission and high-red emission, the low color temperature of device was obtained. Importantly, a romantic sensation giving and supposedly physiologically friendly candlelight style emission can hence be driven by electricity in lieu of hydrocarbon burning and greenhouse gas-releasing candles that were invented 5000 years ago. |
| Databáze: | OpenAIRE |
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