In the long and interesting history of Christmas lights, nothing is brighter than light-emitting diodes (or LEDs). But what makes LED Christmas lights such a powerful light source? And how to create colors in the LEDs?
LEDs not only make more efficient use of the power they consume, but they also tend to be brighter due to this efficient use of electrical energy. But now, this is not true news for anyone. Most people know that using LEDs can save electricity, and they now have more illumination than incandescent lights. But what about those colors? Is the color created in the LED the same as a traditional incandescent light?
The answer is yes. The color creation of LEDs is no different.
Adding color to an incandescent Christmas light is as simple as applying the desired color to the light bulb. Want a deeper color? Then apply a thicker layer of paint to the bulb. Need a lighter color shade? Use less paint. It's that simple.
So, how about the color of the LED Christmas light actually produced? It is a far cry from the way incandescent lights are made. Let's take a closer look at this process.
How do LED Christmas lights create colors?
The two main types together make up the entire rainbow, including:
Aluminum gallium indium phosphide alloy: This LED produces red, orange and yellow.
Indium gallium nitride alloy: This LED produces blue and green.
So, what caused a separate LED color? By slightly changing the composition of the material (aluminum gallium or indium gallium), we can change the color of the light emitted by the diode to blue or green (for indium gallium), and more red, orange, if it is aluminum gallium. It is yellow. From this we can create the entire rainbow.
But how is this done? This is a bit tricky, so let's break it down.
The LED is a p-n junction diode that illuminates when activated. When a voltage is applied to the leads of the semiconductor, the electrons recombine with the "holes" in the diode itself, causing it to release energy in the form of photons. This process is called electroluminescence.
This will activate the LED, but how do you create a color?
Depending on the energy gap of the semiconductor (difference between the two sides), different colors are emitted.
The smallest gap will glow red, and if the gap gets bigger, the red will move blue all the time, allowing you to do everything from red and green decorated holiday homes to weird orange and purple decorations for Halloween. festival.
How to create a white LED?
There is no doubt that white is the most popular color for LED Christmas lights. But how do you create a white LED?
Now, we know how to create colors with LED lights, but there is no mention of white. That's because it's created differently.
There are two ways to create a white LED light:
Combine red, blue and green
Believe it or not, unlike the feeling of mixing paint when you were young, the combination of correctly mixed red, blue and green LED lights actually produces white light. However, if you are familiar with this process, it is actually the same way that the TV produces a white appearance on the screen.
In addition, you can adjust this process to create more than one white shading, including warm white and cool white.
Blue LED with phosphor coating
In addition to mixing red, blue and green, white LED illumination can also be created by using a blue LED with a yellow luminescent phosphor coating.
When the blue LED is illuminated on the phosphor coating, the two colors combine to produce white light.
How does an LED emit multiple colors?
So far, we've covered how to create colors in LED Christmas lights, from the entire rainbow spectrum to the popular white LEDs.
But how do individual LEDs emit multiple colors at the same time?
In fact, a color-changing LED is not just an LED, but usually three LEDs are combined with a basic computer controller that you can use to control them. By combining red, blue and green LEDs, each color is simultaneously controlled by a controller unit that creates each color in the rainbow.
For example, if the red and green LEDs are off and the blue LED is lit, the LED unit will emit blue light. The same is true for red and green.
Essentially, this is also the way to create color-changing LEDs. By starting with 100% blue and setting a gradual increase from 0% to 100% red, the light seems to change from blue to purple.
There is no doubt that LED Christmas lights are bright, long lasting and powerful Christmas lights.
Ninghai Haohua CompanyLED Holiday LightHttps://www.nhhx.net
来源：博客园
作者：Bellanhhx
链接：https://www.cnblogs.com/Bellanhhx/p/11770949.html