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Light Extraction Efficiency Package (4)
Dec 04, 2018

Phosphor selection and coating

For white power LEDs, the increase in luminous efficiency is also related to the choice of phosphor and process. In order to improve the efficiency of the phosphor to stimulate the blue chip, firstly, the selection of the phosphor should be appropriate, including the excitation wavelength, the particle size, the excitation efficiency, etc., and comprehensive evaluation is required, taking into account various performances. 

Secondly, the coating of the phosphor should be uniform, preferably the thickness of the glue layer of each light-emitting surface of the light-emitting chip is uniform, so as to avoid local light being unable to be emitted due to uneven thickness, and the quality of the spot can be improved.

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