Researchers have designed smart, color-controllable white light devices from quantum dots, which are more efficient and have better color saturation than standard LEDs, and can be used to reproduce daylight conditions in a single light.
The next-generation smart lighting system was designed by researchers from the University of Cambridge.
The team found that they could reproduce daylight more accurately by using more than three primary lighting colors. Excellent color rendering, a wider operating range than current smart lighting technology, and a wider spectrum of white light customization were all shown in early tests. The results are published in a journal.
Smart lighting systems can have a positive effect on human health since they can respond to individual moods. Light can be bluish-white in the morning and reddish-white in the evening if it's smart lighting.
It is said that a room with sufficient natural or artificial light, good glare control, and views of the outdoors has good levels of visualcomfort. Under artificial light, visual comfort depends on how accurate the colors are. Smart white lighting needs to be able to accurately express the color of surrounding objects since the color of objects is determined by illumination. Three different colors of light are used to achieve this.
Since the 1990s, quantum dots have been studied and developed as light sources. They show excellent color performance due to their optoelectronic properties.
Next- generation smart white lighting is based on quantum-dot light-emitting diodes. System-level color maximization, device-level optoelectronic simulation, and material-level parameters were combined.
A new method for charge transport and light emission modeling was created by the researchers.
The QD-LED system uses more than one red, green, and blue color. The researchers were able to overcome some of the limitations of LEDs with the help of quantum dots of a specific size.
A new device architecture of QD-LED based white lighting was created by the team after validation. A wide spectrum of white light shade customisation was shown in the test, as well as excellent color rendering.
The Cambridge-developed QD-LED system had a CCT range from 2243K to 9207K, compared with the currentLED-based smart lights which have a CCT between 2200K and 6000K. The QD-LED system had a color rendering index of 97, compared to the current smart bulb range of between 80 and 91.
The design could lead to more accurate lighting. The three LEDs have to be individually controlled to achieve a color. The QD-LED system uses a single control voltage to drive all the quantum dots.
Professor Kim from Cambridge's Department of Engineering said that the system was a world-first. This is the first step towards exploitation of quantum-dot-based smart white lighting.
The ability to better reproduce daylight through its varying color spectrum in a single light is what we aimed for. We used quantum dots to achieve it. The research opens the way for a lot of new lighting environments.
The control and drive of the QD-LED white lighting is similar to that of a display in that it is made with a printing process. This is a more difficult task with standard point source LEDs.
More information: Optoelectronic System and Device Integration for Quantum-Dot Light-Emitting Diode White Lighting with Computational Design Framework, Nature Communications (2022). DOI: 10.1038/s41467-022-31853-9 Journal information: Nature Communications
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