LED Smart Lighting System Based on Quantum Dots More Accurately Reproduces Daylight



Quantum dot-based smart lighting innovations are more effective than traditional LEDs, have superior color saturation, and can dynamically mimic daylight conditions in a single light.

Quantum dots, tiny semiconductors that are just a few billionths of a meter in size, have been used by researchers to create intelligent, color-controllable white light devices that are more effective than standard LEDs, have better color saturation, and can dynamically replicate daylight conditions in a single light.

The next-generation smart lighting system was created by researchers from the University of Cambridge by combining nanotechnology, color science, cutting-edge computer techniques, electronics, and a novel production process.

The researchers discovered that they could replicate daylight more faithfully by employing more than the three fundamental illumination hues present in conventional LEDs. The new design's first testing revealed better color reproduction, a broader operational range than present smart lighting technology, and a wider spectrum of white light customisation. The findings were published in the journal Nature Communications today, August 3.

Given that ambient light availability and features are related to wellbeing, the broad adoption of smart lighting systems—which can adjust to individual moods—may benefit human health. Additionally, circadian rhythms, which control the daily cycle of sleep and wakefulness, may be used to control smart lighting such that it is reddish-white in the morning and evening and bluish-white during the day.

A space is considered to have acceptable levels of visual comfort when it has enough natural or artificial light, adequate glare management, and views of the outside. The quality of color rendering affects visual comfort in indoor settings with artificial light. Since illumination determines an object's color, smart white lighting must precisely reflect the color of the items it surrounds. Currently available technology does this by utilizing three separate light hues at once.

Since the 1990s, quantum dots have been researched and developed as light sources because of their excellent color purity and tunability. They exhibit great color performance in both wide color controllability and high color rendering capabilities because of their distinctive optoelectronic features.

The Cambridge researchers created an architecture for the next-generation QD-LED-based smart white lighting system. They integrated material-level parameter extraction, device-level optoelectronic modeling, and color optimization at the system level.

Together with a novel approach for charge transport and light emission modeling, the researchers developed a computational design framework using a color optimization technique used for neural networks in machine learning.

Beyond the usual red, green, and blue, the QD-LED system makes use of numerous basic colors to more faithfully imitate white light. The researchers were able to get around some of the practical restrictions of LEDs and get the emission wavelengths they required to test their hypotheses by selecting quantum dots of a specified size, between three and 30 nanometers in diameter.

The team then developed a novel device architecture for white illumination based on QD-LEDs to validate their idea. Excellent color reproduction, a broader working range than existing technology, and a broad range of white light shade modification were all demonstrated in the test.

Comparing the Cambridge-developed QD-LED system to contemporary LED-based smart lights, which have a CCT between 2200K and 6500K, the CCT range of the Cambridge-developed QD-LED system was 2243K (reddish) to 9207K (bright noon sun). The QD-LED system has a color rendering index (CRI) of 97 as opposed to the current smart bulb ranges, which are between 80 and 91. The CRI is a measurement of the colors lit by the light in contrast to daylight (CRI=100).

The design may open the door to smart lighting that is more precise and efficient. To produce a certain hue in an LED smart bulb, each of the three LEDs must be separately regulated. To obtain the complete color temperature range in the QD-LED system, all of the quantum dots are controlled by a single common control voltage.

A completely optimized, high-performance quantum-dot-based smart white lighting system is a first for the world, according to co-researcher Professor Jong Min Kim of Cambridge's Department of Engineering. "This is the first step toward the full exploitation of smart white lighting based on quantum dots for everyday applications."

We sought to better mimic daylight by dynamically altering its color spectrum in a single light, according to Professor Gehan Amaratunga, who co-led the study. "We accomplished it in a novel manner by utilizing quantum dots. This study pave the way for several novel lighting situations that are human sensitive.

Because the Cambridge team's QD-LED white lighting is manufactured using a printing method and has control and drive mechanisms akin to those in displays, its form is adaptable to big area lighting surfaces. This is a more difficult process since individual control is needed for conventional point source LEDs.

by CAMBRIDGE UNIVERSITY 

Comments

Post a Comment

Popular posts from this blog

Do You Sleep on Your Back or Side? Here's The Research on 'Optimal' Sleep Positions

Image
William Dement, a renowned sleep researcher at Stanford University, is quoted as saying that after 50 years of study, the only reason he can think of for why we sleep is "because we become sleepy." Sleep certainly matters for our health and wellbeing even though it may be, as one researcher put it, "the sole major habit in quest of a function." Do we, however, have it right? What do studies on sleeping positions say? Is there a proper sleeping position? The majority of people favor sleeping on their side. This is encouraging news because people who sleep on their backs are more likely to have trouble falling asleep or breathing during the night. Most of the time, we have a tendency to shift around quite a bit at night. According to a study involving 664 sleepers, on average, participants slept on their side 54% of the time, their back 37% of the time, and their front 7% of the time. Males are more likely to change positions throughout the night and move their arms, ...
Read more

The Science of Beards

Image
Here are a few facts that scientists have learned about beards as the world prepares to celebrate amazing facial hair on World Beard Day (September 3). Strong Manly Beard Men who have beards appear to be more dominant, aggressive, and strong, according to numerous studies[1][2][3] that have been conducted. In fact, men claim that growing facial hair makes them feel[4] more manly. Men who choose to grow beards tend to have higher testosterone levels than men who choose to keep their faces clean-shaven, according to research. They are also more likely to be hostile sexists, or to support the patriarchy and male dominance, as well as to believe that women belong in the kitchen, according to research on this topic. The beards (and muscles) on these males might be used to enforce gender roles. Professor R. D. Guthrie proposed in his book "Evolution of human threat display organs" from the 1970s that beards could be utilized to scare male rivals by improving aggressive and threaten...
Read more

Scientists Uncover a Surprising Connection Between Appetite and Sun Exposure

Image
Recent studies from Tel Aviv University show that women are not affected by sun exposure on their hunger levels, but males are. The study shows how the metabolic pathway is engaged differently in men and women. It was carried out utilizing lab models. Males of both animal and human species, as well as those exposed to the sun, are reportedly triggered to produce a protein called p53 that repairs any DNA damage that may have been done to the skin as a result of the exposure. The body produces the hunger-inducing hormone ghrelin in response to p53 activation. In females, the hormone estrogen stops p53 from interacting with ghrelin, preventing the desire to eat after being in the sun. The ground-breaking investigation was directed by professor Carmit Levy and Ph.D. candidate Shivang Parikh of the Department of Human Genetics and Biochemistry at TAU's Sackler Faculty of Medicine. In addition to the Tel Aviv Sourasky (Ichilov), Assuta, Meir, and Sheba Medical Centers, Drs. Yiftach Gepne...
Read more