"High color, low light decay, high-quality lighting has become an important direction of development of white LED lighting." Institute of Rare Earth, Dr. Ma Yue light-emitting Division, said in April 28 LED Engineering Tour Shanghai station, "the future, LED lighting And the backlight display will become the two most important application areas for white LEDs."
Ma Xiaole introduced that currently white LEDs are mainly used in architectural lighting, LED backlighting, home lighting, shopping mall lighting, liquid crystal display, traffic lights and other fields. The performance of white LED devices depends largely on the performance of phosphors. There are currently four ways to generate white LEDs: multi-chip, blue LED plus yellow powder, blue LED plus red green powder, ultraviolet LED plus red green blue powder.
However, each of the above four methods has its own advantages and disadvantages. Among them, the multi-chip has the disadvantages of high cost and different decay rate and life of each chip; the second method has high light efficiency, low color rendering, and low color temperature is difficult to realize; although the third method can improve color rendering, The color temperature can be adjusted in a wide range, but the light effect is low; the fourth method has the disadvantage that powder mixing is difficult.
"Under the light source to be tested, determine the color coordinates of the color sample (the ability to restore the color of the object), which is determined by the spectral brightness coefficient of the color sample." Ma Xiaole said, "The best combination of color rendering index and brightness is 532nm yellow-green. +625nm red phosphor".
The research shows that the rare earth alumina powder solution developed by Rare Earth for common LED backlight system has a color gamut of about 70% NTSC; β-sialon green powder and nitride red powder solution, and the color gamut range is about 80% NTSC (phosphor mutual absorption) , low light efficiency); and fluoride red powder and new nitrogen oxide green powder solution can be achieved (NTSC ≥ 100%).
In addition, for the wide color gamut LED backlight, a new type of high-efficiency NOx green phosphor with a stable structure and a new high-efficiency fluoride red phosphor have been developed. Ma Xiaole said, "After technical research, there have been researches on rare earths that have successfully realized the mass production of the fluoride series red powder."
Dr. Ma Xiaole, Rare Earth Luminescence Division
Ma Xiaole introduced that currently white LEDs are mainly used in architectural lighting, LED backlighting, home lighting, shopping mall lighting, liquid crystal display, traffic lights and other fields. The performance of white LED devices depends largely on the performance of phosphors. There are currently four ways to generate white LEDs: multi-chip, blue LED plus yellow powder, blue LED plus red green powder, ultraviolet LED plus red green blue powder.
However, each of the above four methods has its own advantages and disadvantages. Among them, the multi-chip has the disadvantages of high cost and different decay rate and life of each chip; the second method has high light efficiency, low color rendering, and low color temperature is difficult to realize; although the third method can improve color rendering, The color temperature can be adjusted in a wide range, but the light effect is low; the fourth method has the disadvantage that powder mixing is difficult.
"Under the light source to be tested, determine the color coordinates of the color sample (the ability to restore the color of the object), which is determined by the spectral brightness coefficient of the color sample." Ma Xiaole said, "The best combination of color rendering index and brightness is 532nm yellow-green. +625nm red phosphor".
The research shows that the rare earth alumina powder solution developed by Rare Earth for common LED backlight system has a color gamut of about 70% NTSC; β-sialon green powder and nitride red powder solution, and the color gamut range is about 80% NTSC (phosphor mutual absorption) , low light efficiency); and fluoride red powder and new nitrogen oxide green powder solution can be achieved (NTSC ≥ 100%).
In addition, for the wide color gamut LED backlight, a new type of high-efficiency NOx green phosphor with a stable structure and a new high-efficiency fluoride red phosphor have been developed. Ma Xiaole said, "After technical research, there have been researches on rare earths that have successfully realized the mass production of the fluoride series red powder."
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