How does visible light color difference occur
How is visible light visible to the naked eye generated?
What is the color visible to the naked eye UV-C LED Visible part of the emission spectrum, It comes from oxygen substitution sites in semiconductor materials, Electronic transitions between various deep energy levels such as lattice mismatch dislocations and conduction band energy levels. Because the defect energy level is located higher relative to the quantum well valence band, So the photons emitted by electronic transitions have longer wavelengths, usually 450nm left and right, For visible light.
Why should visible light appear in different colors?
UV-C LED Chips and IC Similar to semiconductor devices, It is cut from a wafer. Restricted by the accuracy of semiconductor equipment, Chips from different regions and batches on the wafer, The concentration of material defects, There are slight differences in defect categories. This difference results in a difference in the position of deep energy levels that emit visible light, Further emit visible light of different wavelengths, Presenting different colors. Although the wavelength difference is very small, But it is noticeable to the naked eye.
Does the color difference affect UVC Sterilizing Effect?
The conclusion is that it does not affect. Specifically, Take four light beads of different colors (Returned by a certain customer) , As shown in the figure 1 shown. Test it using an integrating sphere UVC Band optical power, The specific data is shown in the table 1 shown, All are within the nominal gear range. This data indicates that no matter what state the color appears to the naked eye, UVC The optoelectronic performance of the band meets the requirements, This ensures the consistency of the sterilization effect. If deemed necessary, You can also send your company's products with color differences to our company for photoelectric parameter review.
image 1 Two light beads with significantly different colors to the naked eye
table 1 Integral sphere test results of four LED package with different luminous colors (@40mA, This batch of LED package has a nominal value 4-6mW, 270-280nm)
Can the color difference be effectively controlled?
Due to the extremely weak visible light, And the difference between the main wavelengths of visible light is relatively small. It is basically impossible to separate its color using traditional spectroscopic equipment bin control. of course, With the advancement of technology, (1) LED The improvement of efficiency will reduce the proportion of visible light energy, Further reduce the color difference; (2) Progress in Spectral Devices, Improved sampling resolution for visible light, Then it can be divided into bin control; (3) Improvement of consistency within and between batches of epitaxial equipment, Reduce the color difference of the light beads when emitting light.
Users can use it with confidence. If you have any questions, please contact our sales staff immediately, Thank you!