First of all, although no luminous powder is used, color LEDs of different colors such as red, yellow, green, blue, and purple can be prepared, but because the luminous efficiency of these different color LEDs is very different, after using luminous powder, you can use some The advantages of high luminous efficiency of band LEDs can be used to prepare LEDs of other bands to improve the luminous efficiency of this band. For example, some green wave LEDs have low efficiency, and a high-efficiency LED called "apple green" is prepared by using luminous powder for mobile phone backlights, which has achieved good economic benefits.

Secondly, it is difficult to precisely control the light-emitting wavelength of LEDs, which will cause some wavelengths of LEDs to be unapplied and wasteful. For example, when 470nm LEDs need to be prepared, LEDs with a wide range from 455nm to 480nm may be prepared. LEDs with light-emitting wavelengths at both ends can only be disposed of at a lower price or discarded, and the use of luminous powder can convert these so-called "wastes" into the colors we need and use them.

Third, after using luminous powder, the light color of some LEDs will become softer or brighter to suit different application needs. Of course, the most widespread application of luminous powder in LEDs is in the field of white light, but due to its special advantages, it can also be used in color LEDs to a certain extent, but the application of phosphors in color LEDs has just started, and further in-depth research and development.