Simply talk about LED phosphors

Guide: Whether it is full-spectrum LED or outdoor lighting, the requirements for light source are inseparable from high light efficiency, and high light efficiency is just one of the advantages of LED.

Whether it is full-spectrum LED or outdoor lighting, the requirements for light source are inseparable from high light efficiency, and high light efficiency is just one of the advantages of LED.

The luminous efficacy of incandescent and tungsten halogen lamps is 12-24 lm/w (lumens/watt), the luminous efficacy of fluorescent lamps is 50-70 lm/w, and the luminous efficacy of sodium lamps is 90-140 lm/w. Most of the power consumption becomes Heat loss. The LED light efficiency can be improved to 50-200 lm/w.

Three ways to achieve white LED

1) Adopting red, green and blue LED combinations to emit light, that is, multi-chip white LED;

2) Using a blue LED chip and a yellow phosphor, white light is obtained by complementing blue and yellow light, or a blue LED chip is used with red and green phosphors, and blue light emitted by the chip, red light and green light emitted by the phosphor Color mixing to obtain white light;

3) The three-color phosphor is excited by the near-ultraviolet light emitted from the ultraviolet LED chip to obtain white light.

The white LEDs obtained in the latter two methods need to use phosphors, which are called phosphor-converted LEDs. Compared with multi-chip white LEDs, they have advantages in control circuit, production cost, heat dissipation, etc., and occupy the current LED product market. leading position.

LED phosphors play a key role in improving the light quality and color rendering of LED products. The industry believes that LED phosphors can improve the light efficiency of LED package devices, improve light color quality, and reduce packaging cost by LED technology innovation. The eternal theme of technological development.

LED phosphors are commonly used in the following

Common product

Phosphors can also be classified into red powder, green powder, yellow powder, blue powder, etc. according to the color of the light.

White LEDs and other LEDs can be prepared by using phosphors for the following application fields.

display

Backlight

Headlight

outdoor lighting

Indoor lighting

......

According to industry research institutions, with the growth of LED lighting market and market penetration, the global LED phosphor market will reach 1.2 billion US dollars in 2017.

Source: Yole Development

In 2015, the total sales volume of LED phosphors in China reached 186 tons.

Phosphor Company Profile

Select 20 manufacturers with 2835 white LEDs on a platform to conduct brand statistics on phosphors.

As lighting users increasingly demand the efficacy, lifetime, and color rendering of LED light sources, higher requirements are placed on the technology and performance of phosphors that are indispensable for white LEDs.

At present, the conventional LED phosphors on the market still have defects, and various companies are seeking technological breakthroughs to form new profit growth points.

Industry research institutes said that with the continuous updating of LED technology and the continuous development of application fields, the domestic and international phosphor powder market will show steady growth.