What are the ways to go with full spectrum light source technology?
[Text|High-tech LED Ganqin] With the improvement of people's living standards, the requirements for lighting have gradually shifted from pure environmental protection and energy conservation to the pursuit of health and comfort. Affected by this, LED lighting companies have also promoted energy conservation and environmental protection from the previous, and began to adapt to consumer psychology and physiological health needs as the goal, the main "health lighting" brand.
CRI sought <br> <br> Talking LED lighting "health" index, industry insiders mentioned most is the color of the product, the so-called color, simply put, is the source of the object Color reproduction capabilities. Generally speaking, the higher the color rendering index, the better the color rendering of the light source and the stronger the color reproduction ability of the object.
According to Wang Mengyuan, general manager of Zhonghao Optoelectronics, the color quality of the light source is largely determined by the spectrum. “The light source of the same light color will be composed of different spectra, and the light source with a wide spectral composition can provide better color rendering quality.†Wang Mengyuan said that when the light source spectrum has few or no objects reflected by the reference light source, When the wave is used, the color will have a significant color difference, and the greater the degree of chromatic aberration, the worse the color rendering of the color by the light source.
In addition, Jingke Electronics' ceramic-based gold-free package product "Easy Flash--E-Flash LED" is a white LED product specially designed for flash applications. In order to meet the needs of true color photography, Jingke Electronics LED The flash complements the warm tones for color reproduction.
"At present, the warm-tone flash used in the industry lacks red, and Jingke Electronics uses a warm-toned flash to complement the red-tone color, which can make the RGB three-color reduction ability meet the satisfactory demand." President of Jingke Electronics Dr. Xiao Guowei said that Jingke Electronics' full-spectrum LEDs can restore the full-band color difference and enhance the color vividness of photos.
According to Xiao Guowei, this series of products fully exploits the advantages of flip-chip gold-free technology. It can use pulsed electric drive of 1500mA or more to instantaneously output brightness up to 380lm, and can realize ultra-thin, ultra-small size package, which will be used for various application flashes. Digital products and intelligent transportation systems provide an efficient, high-quality product.
Phosphor into key <br> <br> is well known to enhance the quality of light and color LED products, LED phosphors play a key role, the industry believes that to improve light efficiency LED package device via phosphor technology innovation, improving Light color quality and reduced packaging cost are the eternal themes of LED phosphor technology development.
It is understood that the mainstream scheme of the previous white LED is to apply the traditional yellow phosphor on the blue GaN-based LED chip. The emission spectrum of the scheme is mainly yellow-green light, and the white LED of the final package is colored due to less red light component. The index is lower (<80).
Phosphor companies include Keheng, Rare Earth, etc. It is believed that the full-color LED phosphors with balanced spectral components will become the higher goal pursued by the industry, and the industry has also developed full-spectrum phosphors as their technology upgrade products.
In order to solve the problem of low color rendering index, the industry proposed a green and red phosphor mixing scheme instead of the yellow phosphor scheme. However, although this scheme improves the color rendering index, there is a problem of reabsorption between different phosphors. Affects the lumen efficiency of white LEDs.
At the same time, different phosphors also have problems in that the luminescence temperature characteristics and aging characteristics are inconsistent, resulting in the color of the white LED drifting with temperature and use time.
Feng Rongbiao, project manager of Keheng's LED business unit, said that in the above scheme, ordinary phosphors emit green light under blue light excitation, lack long-wave components in the spectrum, and cannot synthesize a single white light. To solve this problem, it is necessary to adjust the matrix cation component. , nitriding technology, doping technology and other methods, the introduction of long-wave emission center, in order to achieve full spectrum emission. That is, the blue light intensity is suppressed, and the red spectrum is compensated to make the spectrum more continuous.
The concept of full-spectrum play "The reason why the blue light intensity is to be reduced is because blue light has great harm to human physiological and mental health, especially in the field of indoor lighting. It is urgent to introduce a full-spectrum packaging mode." Feng Rongbiao said that the phosphor In the aspect, a nitriding technique can be adopted to realize full-spectrum emission of red and green after energy transfer from the center of the green light to the center of the red light.
Although the current mainstream method for achieving high color rendering index LED white light in the industry is to increase the red powder excited by changing the phosphor material, this method improves the color rendering, but the red powder is greatly affected by the excitation spectrum and temperature. The heat emitted during the use of the product changes the red-white spectral characteristics of the LED white light.
The direct consequence of this change is generally reflected in the decrease in color temperature and color rendering as the product lighting time increases, but the decrease in light efficiency due to weakening of the excitation efficiency also occurs. Therefore, after taking into account the color rendering, the light effect is difficult to guarantee.
“The blue light is particularly high in the LED spectrum, but the blue and green parts lack the band. To do the full spectrum light source, the missing part must be compensated by the phosphor technology.†Zhao Kun, vice president of Xinli Light Source, admitted that it is not very good at present. The solution can do a full-spectrum light source. "Because the blue light is too close to the blue light, the wavelength is too small. If the blue LED is used to excite the cyan phosphor, the conversion efficiency will be reduced and the light efficiency of the entire LED product will be reduced. On the contrary, it is not worth the loss."
Liu Ronghui, director of the Rare Earth Luminescence Division, said, "As far as the current situation is concerned, the full spectrum is definitely not available because there is no such light in the 180 to 190 band. The company is currently developing this LED spectrum. In order to make a full spectrum phosphor layout for the future."
“The full-spectrum light source is suitable for indoor lighting, special lighting and other fields with high color rendering index and high light quality.†Zhao Kun said, but for the future technological development of full-spectrum phosphors, it is still in the concept stage. It is still to be seen that the light effect, color rendering and stability cannot be solved at the same time.
CRI sought <br> <br> Talking LED lighting "health" index, industry insiders mentioned most is the color of the product, the so-called color, simply put, is the source of the object Color reproduction capabilities. Generally speaking, the higher the color rendering index, the better the color rendering of the light source and the stronger the color reproduction ability of the object.
According to Wang Mengyuan, general manager of Zhonghao Optoelectronics, the color quality of the light source is largely determined by the spectrum. “The light source of the same light color will be composed of different spectra, and the light source with a wide spectral composition can provide better color rendering quality.†Wang Mengyuan said that when the light source spectrum has few or no objects reflected by the reference light source, When the wave is used, the color will have a significant color difference, and the greater the degree of chromatic aberration, the worse the color rendering of the color by the light source.
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Significant contrast (the figure below shows more than 90, the light color is more natural)
In addition, Jingke Electronics' ceramic-based gold-free package product "Easy Flash--E-Flash LED" is a white LED product specially designed for flash applications. In order to meet the needs of true color photography, Jingke Electronics LED The flash complements the warm tones for color reproduction.
"At present, the warm-tone flash used in the industry lacks red, and Jingke Electronics uses a warm-toned flash to complement the red-tone color, which can make the RGB three-color reduction ability meet the satisfactory demand." President of Jingke Electronics Dr. Xiao Guowei said that Jingke Electronics' full-spectrum LEDs can restore the full-band color difference and enhance the color vividness of photos.
According to Xiao Guowei, this series of products fully exploits the advantages of flip-chip gold-free technology. It can use pulsed electric drive of 1500mA or more to instantaneously output brightness up to 380lm, and can realize ultra-thin, ultra-small size package, which will be used for various application flashes. Digital products and intelligent transportation systems provide an efficient, high-quality product.
Phosphor into key <br> <br> is well known to enhance the quality of light and color LED products, LED phosphors play a key role, the industry believes that to improve light efficiency LED package device via phosphor technology innovation, improving Light color quality and reduced packaging cost are the eternal themes of LED phosphor technology development.
It is understood that the mainstream scheme of the previous white LED is to apply the traditional yellow phosphor on the blue GaN-based LED chip. The emission spectrum of the scheme is mainly yellow-green light, and the white LED of the final package is colored due to less red light component. The index is lower (<80).
Phosphor companies include Keheng, Rare Earth, etc. It is believed that the full-color LED phosphors with balanced spectral components will become the higher goal pursued by the industry, and the industry has also developed full-spectrum phosphors as their technology upgrade products.
In order to solve the problem of low color rendering index, the industry proposed a green and red phosphor mixing scheme instead of the yellow phosphor scheme. However, although this scheme improves the color rendering index, there is a problem of reabsorption between different phosphors. Affects the lumen efficiency of white LEDs.
At the same time, different phosphors also have problems in that the luminescence temperature characteristics and aging characteristics are inconsistent, resulting in the color of the white LED drifting with temperature and use time.
Feng Rongbiao, project manager of Keheng's LED business unit, said that in the above scheme, ordinary phosphors emit green light under blue light excitation, lack long-wave components in the spectrum, and cannot synthesize a single white light. To solve this problem, it is necessary to adjust the matrix cation component. , nitriding technology, doping technology and other methods, the introduction of long-wave emission center, in order to achieve full spectrum emission. That is, the blue light intensity is suppressed, and the red spectrum is compensated to make the spectrum more continuous.
The concept of full-spectrum play "The reason why the blue light intensity is to be reduced is because blue light has great harm to human physiological and mental health, especially in the field of indoor lighting. It is urgent to introduce a full-spectrum packaging mode." Feng Rongbiao said that the phosphor In the aspect, a nitriding technique can be adopted to realize full-spectrum emission of red and green after energy transfer from the center of the green light to the center of the red light.
.jpg)
Although the current mainstream method for achieving high color rendering index LED white light in the industry is to increase the red powder excited by changing the phosphor material, this method improves the color rendering, but the red powder is greatly affected by the excitation spectrum and temperature. The heat emitted during the use of the product changes the red-white spectral characteristics of the LED white light.
The direct consequence of this change is generally reflected in the decrease in color temperature and color rendering as the product lighting time increases, but the decrease in light efficiency due to weakening of the excitation efficiency also occurs. Therefore, after taking into account the color rendering, the light effect is difficult to guarantee.
“The blue light is particularly high in the LED spectrum, but the blue and green parts lack the band. To do the full spectrum light source, the missing part must be compensated by the phosphor technology.†Zhao Kun, vice president of Xinli Light Source, admitted that it is not very good at present. The solution can do a full-spectrum light source. "Because the blue light is too close to the blue light, the wavelength is too small. If the blue LED is used to excite the cyan phosphor, the conversion efficiency will be reduced and the light efficiency of the entire LED product will be reduced. On the contrary, it is not worth the loss."
Liu Ronghui, director of the Rare Earth Luminescence Division, said, "As far as the current situation is concerned, the full spectrum is definitely not available because there is no such light in the 180 to 190 band. The company is currently developing this LED spectrum. In order to make a full spectrum phosphor layout for the future."
“The full-spectrum light source is suitable for indoor lighting, special lighting and other fields with high color rendering index and high light quality.†Zhao Kun said, but for the future technological development of full-spectrum phosphors, it is still in the concept stage. It is still to be seen that the light effect, color rendering and stability cannot be solved at the same time.
ul 30, 2021 (AmericaNewsHour) -- In a recent published report, Kenneth Research has updated the market report for Lithium Iron Phosphate (LiFePO4) Battery Market for 2021 till 2030. Report further now discusses; the various strategies to be adopted or being adopted by the business players across the globe at various levels in the value chain. In the view of the global economic slowdown, we further estimated that China, India, Japan and South Korea to recover fastest amongst all the countries in the Asian market. Germany, France, Italy, Spain to take the worst hit and this hit is expected to be regain 25% by the end of 2021- Positive Growth in the economic demand and supply.
U.S. Market recovers fast; In a release on May 4th 2021, the U.S. Bureau and Economic Analsysis and U.S. Census Bureau mentions the recovery in the U.S. International trade in March 2021. Exports in the country reached $200 billion, up by $12.4 billion in Feb 2021. Following the continuous incremental trend, imports tallied at $274.5 billion, picked up by $16.4 billion in Feb 2021. However, as COVID19 still haunts the economies across the globe, year-over-year (y-o-y) avergae exports in the U.S. declined by $7.0 billion from March 2020 till March 2021 whilest imports increased by $20.7 billion during the same time. This definitely shows how the market is trying to recover back and this will have a direct impact on the Healthcare/ICT/Chemical industries, creating a huge demand for Lithium Iron Phosphate (LiFePO4) Battery Market products.
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