"White LEDs with blue LEDs will disappear sooner or later."
Four years ago, the father of the Blue LED, Nakamura, spoke of these words. Today, this sentence seems to be slowly fulfilling.
â–²Nobel Physics Prize winner Nakamura Shuji
Nakamura said that lighting can affect people's health, blue light will inhibit the release of melatonin in the brain, blocking sleepiness, as long as there is enough blue light stimulation to the eyes, it will inhibit the secretion of melatonin, resulting in sleep quality and myopia problems, and Early natural light sources did not have this problem.
As a result, many manufacturers proposed the concept of “human-based lightingâ€, which has been frequently mentioned in recent exhibitions, and many products are developing in this direction:
â–² 2018 Frankfurt lighting coeLUX booth real shot: solar simulation lights
Of course, this lamp does not belong to the "violet LED":
â–²coeLUX solar simulation light spectrum
Of course, some manufacturers such as Samsung and Source: Seoul Semiconductor have already developed corresponding LED violet products and applied them in small quantities.
The biggest question faced by Ziguang LED is: expensive. The use of gallium nitride (GaN) substrates is required in violet LEDs to improve the quality and performance of LEDs. However, the cost of GaN substrates is high, so the output and price of violet LEDs are still high.
Purple LED Opportunity: Closer to the Sun Spectrum
In the past, the main mode of white light emitted by LEDs was one in which RGB three colors mixed white light, and the other was the use of a blue chip to excite the phosphor to emit white light. Although it looks like white light from the outside, the spectrogram has obvious short plates, no ultraviolet band, and very few near-ultraviolet wavelength bands, which are subjectively different from natural white light.
The white LED excited by the violet chip can solve this short board.
â–² left, purple LED, better simulation of natural daylight spectrum; right: blue LED, the spectrum has a clear blue spectral peak. (data from the internet)
We know that in addition to visual lighting, there are non-visual photobiological effects. In the last ten years, we have found that in addition to cone cells and rod cells, the third type of cells are called ipRGC cells, which are affected by blue light, including affecting our emotions, or sleeping biological clocks. Of course, these are still in the research stage and there is no clear conclusion.
This is a good business story for manufacturers. Blue LEDs are very different from sunlight. In the evolution of hundreds of thousands of years, the eyes of humans and animals have adapted to sunlight. From this perspective, the sun is best for the body.
Therefore, in the study, sunlight was used as a very good reference. The closer to the standard sunlight or blackbody light source, was considered to be a light source that is more beneficial to the human body. So companies advertise that its spectrum is close to the sun and there will be a certain market opportunity.
Violet LED VS Blue LED
Ultraviolet chips are generally classified into UVA, UVB, and UVC, among which UVA is the most, UVC is the second, and UVB is still very few. Violet LED production is difficult, not only the problem of semiconductor formulations, at present, the purple radiation and light efficiency are very low, and the purple light itself is a serious damage to plastic and other materials, so do purple LED parts requirements are also high.
Violet LED is expensive. At the Frankfurt show in 2018, a sample of UVC has not been mass produced yet. The manufacturer revealed that the price is 200 US dollars. Of course, there is also a little cheaper, but overall, it is much higher than the blue light price, so the violet product is generally Not on lighting.
In addition to the difference in price and production capacity, there is also controversy about Blu-ray and Violet itself. Although the conclusion of blue light harm has not yet been clarified, the statement that Blu-ray inhibits melatonin is not a gimmick. It is a conclusion drawn from many biological experiments and control experiments. The two scientists who had won the Nobel Prize some time ago also made it clear. fact. These findings are good selling points for businesses, and UV manufacturers can use this to attack Blu-ray manufacturers.
Violet can reduce the harm of blue light to the eyes. Listening is indeed very good, but things are not absolute. The same UV is also harmful to the human body, such as the impact on the retina, Blu-ray manufacturers can also be used to attack UV manufacturers. Therefore, to a large extent, it is a commercial gimmick, and how the facts still have to look at professional research conclusions.
This photo was taken at the Samsung booth at the Frankfurt show in 2018. Obviously it is a counterattack against the sunlike violet LED product launched by Seoul. It uses "UV FREE" as a selling point, meaning there is no ultraviolet light, and its term is Human Centric Lighting. It is about people-oriented lighting.
Nearly a decade or two ago is an outbreak of research on photobiological effects. People-oriented is based on human comfort and health. The ultimate goal of lighting is human-oriented services, from blue LED to violet LED, and the constant pursuit of “people-oriented†lighting. process.
Will the purple LED rise in China?
Many foreign companies want to do UV, to seize the first-mover advantage of this future high-profit battlefield, and currently only sporadic enterprises in the country have entered the research and development of this field.
However, it is undeniable that the purple light may rise in China afterwards. Near-purple light can be produced by adjusting the formula using ordinary blue light MOVCD. That is to say, after changing the formula to make Blu-ray, UVA products can be made, but UVC is a lot harder, so domestically want to do UV white LEDs have the technical possibilities and the cost is not too scary.
Is violet light a threat to blue LEDs? For a short period of time, it will not be. Blue LED is cheap enough, and UVA has no advantage in terms of productivity and price. However, there will not be excess capacity coming from the white market in the future. We will wait and see.
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