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Phosphors in the LED manufacturing process

Author：admin On time：2010-2-27 12:35:50 Read： Times

Phosphors in the LED manufacturing process, the role of


    The use of green phosphor and blue LED with yellow phosphor chips, available high-brightness white LED; if the use of green phosphors with blue LED chips, you can have direct access to green; if the use of green with a yellow phosphor and blue phosphor LED chips, get cool colors white; green phosphor can also tie in with the red phosphor and blue LED chips obtained white. White LED's color-rendering index (CRI) and the blue chips, YAG phosphor, correlated color temperature and other relevant, the most important is the YAG powder, different color temperature zones LED, with pink and blue chips not the same. The lower the target color temperature of the pipe to be used in powder emission peak of the longer, the chips have a long peak, below the 4000K color temperature, but also by adding another of red, pink, red component to compensate for the deficiencies, to improve the color-rendering index of the purpose of maintaining the chip and powder the same conditions, the color temperature the higher the color-rendering index higher.
Summed up in production experience, the best Blu-ray and YAG matching relation are as follows:
YAG emission peaks / nm blue peak wavelength / nm
530 ± 5 450-455
540 ± 5 455-460
550 ± 5 460-465
555 ± 5 465-470
Such a comparison made of white white, generally provided by the chip manufacturers are dominant wavelength, peak wavelength to use specialized equipment testing, measuring out the value of the general than the main wave length of around 5nm. Phosphor with chip wavelength determines the color coordinate in a straight line, determine the wavelength of the phosphor and chips. As long as the ratio can be adjusted to minimize the color coordinates of a straight line in this location.
Common LED die are as follows:
Materials Materials wavelength wavelength
InGaN 475-485nm InGaN 525nm
InGaN 465-475nm InGaN 505nm
InGaN 455-465nm InGaN 515nm
InGaAlP 620-640nm GaAlAs / GaAs 660nm
InGaAlP 610-620nm GaAlAs / GaAlAs 660nm
InGaAlP 600-610nm GaP 700nm
InGaAlP 592-600nm GaP 570-575nm
InGaAlP 580-593nm GaP 565-570nm
InGaAlP 567-577nm GaP 550-565nm
InGaAlP 550-565nm PY --- GaAlAs 585nm
Because there are inorganic phosphors, and organic phosphors. If added in case of organic phosphor, YAG phosphor and AB glue ratio is usually 1:6 ~ 10 (weight ratio). As for the AB glue should be 6 ~ 10g between the number of the number of blue chip, depending on the power must be adjusted to fit the size. Chip power of persons who are, in the phosphor, under constant volume, AB glue should be relatively small amount (for example, 1:6). On the contrary, the number of small power, who should be more multi-AB glue (for example: 1:10).
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