The use of phosphors to make color LEDs has the following advantages

First, although phosphors of different colors such as red, yellow, green, blue, and purple can be prepared without using phosphors, the luminous efficiencies of these different color LEDs vary greatly, and after using phosphors, certain The advantages of high luminous efficiency of the band LED are to prepare LEDs of other wavelength bands to improve the luminous efficiency of the band. For example, some green-band LEDs are less efficient. Taiwanese manufacturers use the phosphors we provide to produce a more efficient LED, which is called "apple green" for mobile phone backlights, and has achieved good economic benefits.

Secondly, the wavelength of the LED's light is still difficult to control accurately, which will cause some wavelengths of the LED to be used without waste. For example, when preparing a 470 nm LED, it is possible to prepare a wide range of LEDs from 455 nm to 480 nm. LEDs with illuminating wavelengths at both ends can only be disposed of or discarded at a lower price, and phosphors can be used to convert these so-called "wastes" into the colors we need.

Third, after using phosphors, the color of some LEDs will become softer or brighter to suit different application needs. Of course, the most widely used phosphors on LEDs are still in the white light field, but due to their special advantages, they can also be used in color LEDs. However, the application of phosphors on color LEDs has just started, and further development is needed. In-depth research and development.