OFweek Interpretation: An Overview of LEDs and Their Drivers

Imagine what it would be like to receive a light bulb as a gift. LED lights used to replace spiral bulbs are scarce and expensive, and I actually received such a gift last Christmas. But we are gradually moving towards such an intersection: LED lights will become more and more popular, and prices will become cheaper and cheaper. To a certain extent, they will shoulder the burden of lighting the world.

We are not simply twisting new bulbs that use LED technology into older devices. In the future, there is no need to regard the light source as a one-time item. Soon, the life of the light bulb (including the illuminated part) will exceed the life of the light bulb user. In addition, since the LEDs are turned on and off instantaneously, and the power cycle does not cause their life to be shortened, we can turn on the LEDs only when needed.

This is a potential advantage for astronomers using optical telescopes, and it is possible for cities and building owners to achieve significant energy savings. Even the last police and private security guards tend to turn on night lights only when they respond to motion sensors, because they help them identify where the bad guys are. However, this technology is indeed in the early stages of its development and it takes some time to adapt.

The physical principle of LED

When any diode is in conduction, no matter when the electrons and holes recombine, a certain amount of energy is emitted in the form of photons. The color of light (the energy of a photon) depends on the band gap of the semiconductor material. Aluminum gallium arsenide (AlGaAs) and other materials emit red light. Indium gallium nitride (InGaN) emits green light. Zinc selenide (ZnSe) emits blue light.

White light can be produced by integrating red, green, and blue diodes. However, the high-brightness (HB) white light diodes we are familiar with are integrated with blue InGaN diodes and yellow phosphors (typically yttrium-doped garnet, Ce3+:YAG).

Very interesting and useful things happen when white LEDs use phosphors. During the quantum effect known as the Stokes shift, the photons emitted by the phosphor layer have less energy than the photons they absorb from the blue LED (Figure 1). In high-brightness white LEDs, a small portion of the blue light has a longer wavelength after a Stokes shift. This is a good thing because it allows LED manufacturers to use many different color phosphor layers to extend the emission spectrum and effectively increase the color rendering index (CRI) of the LED.

Maximum module conversion efficiency up to 16.6%

Positive power tolerance 0~+3%

Severe environment resistance

Wind load 2400 pascal

Snow load 5400 pascal

|Highly transparent low iron tempered glass

Excellent performance under low light environment

Anodized aluminum for improving corrosion resistance

Certification IEC61215&IEC61730

10-year product warranty for repair and workmanship

25-year warranty for power output