Analysis of LED light decay phenomenon

Now the production of LED lights must first go through rigorous computer programming, make the light board, and then enter the assembly line of the assembly workshop. We will not start the details.

Everyone has such a life experience. The LED lights just bought are always bright, but after a period of time, many lights will become darker and darker. Why do LED lights have such a process?

To understand why your LED lights are getting darker, we must first understand a professional term-LED light decay.

LED light attenuation means that after a period of time when the LED is lit, its light intensity will be lower than the initial light intensity and cannot be recovered, that is, the reduced part is called the LED light attenuation.

LED lights become darker as they are used because LED lights have light decay.

The light decay of LED lamp products is the weakening of the light signal during transmission. At this stage, LED products made by major global LED manufacturers have different degrees of light decay. High-power LEDs also have luminous decay, which is directly related to temperature. It is determined by the chip, phosphor and packaging technology. At present, the light decay of white LEDs on the market is one of the most important issues in the march to civil lighting.

Light decay generally refers to its luminous flux. When the surface of the photosensitive drum is charged, as the charge accumulates on the surface of the photosensitive drum, the potential continues to rise, and finally reaches the "saturation" potential, which is the highest potential. The surface potential will decrease over time. Generally, the working potential is lower than this potential. This process of natural decrease in potential over time is called the "dark decay" process. When the photosensitive drum is scanned and exposed, the dark area (referring to the surface of the photoconductor not irradiated by light) is still in the dark decay process; the bright area (referring to the surface of the photoconductor of the part irradiated by light) the carrier density in the photoconductive layer increases rapidly. The conductivity rises rapidly, forming a photoconductor voltage, the charge disappears quickly, and the surface potential of the photoconductor also drops rapidly, which call it "light decay".