Phosphors, commonly known as glow-in-the-dark powder, are usually divided into two categories: photostored glow

-in-the dark powder and radioactive glow-in-the dark powder. Photogenic energy storage noctilucent powder is pho

-sphor in natural light, sunlight, ultraviolet light irradiation, the light energy is stored, after the stop of 

light irradiation, and then slowly released in a fluorescent way, so in the night or dark place, can still see 

the glow, lasting for as long as a few hours to more than ten hours.

Using phosphor to make color LED has the following advantages:

1, although without the use of phosphors, you can prepare red, yellow, green, blue, purple and other different 

colors of color LED, but because these different colors of LED luminous efficiency is very different,

After the use of phosphor, you can make use of the advantages of high luminescence of some bands LED to prepare 

other bands LED, in order to improve the luminescence efficiency of the band. Some green leds, for example

Low efficiency, the use of phosphor preparation of a high efficiency, called "apple green" LED for mobile phone 

backlight, has achieved better economic benefits.

2. It is difficult to accurately control the luminous wavelength of LED, so some wavelengths of LED can not be u

-sed and there will be waste. For example, when 470nm LED is needed, it may be possible

The LED produced is a wide range from 455nm to 480nm. Leds with light wavelengths at both ends can only be disposed 

of or discarded at a relatively low price, while phosphors can be used

We turn this so-called "recycling" into the colors we need and use them.

3, after the use of phosphor, some LED light color will become more soft or bright, to adapt to different application 

needs. Of course, the most widespread use of phosphors in leds is

In the field of white light, due to its special advantages, it can also be used in color LED, but the application of 

phosphor in color LED is still in its infancy and needs to be further carried out

In-depth research and development.