1. First of all, look at the CIE map before deploying the light powder, and you need to find the wavelength of the phosphor powder; we know that the wavelength of the chip used is 460MM, and its coordinate point is (x0.44 y0.41), then On the CIE diagram, connect the chip and the wavelength to the coordinate point x.y and extend it to the upper CIE wavelength point. Finally, the extension point of this wavelength is the phosphor emission wavelength we need (the target phosphor wavelength is 585MM). ).

   2. Secondly, after finding the wavelength, we need to find the corresponding phosphor. If only one kind of phosphor is used, the color rendering will be lower, so we need to use more than two kinds of phosphors to mix (such as red + green), How to choose the color matching and the proportion of the deployment? These involve the target of the color coordinate and the requirements of the color rendering index. The appropriate ratio of red and green powder will obtain the required wavelength of the phosphor. If the Ra requirements are higher, the longer wavelength red 650MM can be selected. For red powder and green powder with a wavelength of 520MM, it will be easy to make a CRI of more than 90.

   3. Finally, when the appropriate ratio of red and green powder to the target phosphor has been found (the ratio of red and green should not be changed), if the coordinates of the product deviate from the required coordinates, the color at this time can be observed on CIE. The coordinates and the required color coordinate points, the wavelength point of the blue light chip, and the wavelength point of the target phosphor are on a straight line. At this time, the ratio of silica gel and phosphor needs to be adjusted. When the color coordinate is lower than the target coordinate, the concentration of phosphor needs to be increased. , when the color coordinate is higher than the target coordinate, the concentration of phosphor should be reduced.

    Suggestion: When the color rendering index requires a higher Ra≥90, it is recommended to use the red powder + green powder for blending. Use the method of yellow powder + green powder + red powder to mix, the disadvantages are: low consistency, difficult to control; in the case of high color rendering index requirements Ra≤85, it is recommended to use greenish yellow powder + red powder to mix, the advantage is the light effect High and easy to control.