The light decay speed of SMD LED light emitting diode is affected by many factors, and its changes are relatively complex.
Generally speaking, under normal use conditions, the light decay speed of SMD LED is relatively slow. When it is first used, its luminous flux remains basically stable, and as the use time increases, the light decay gradually appears. Usually, the light decay may not be obvious in the first few thousand hours of use, but as time goes on, the light decay speed will accelerate.
The main factors affecting the light decay speed of SMD LED are as follows.
The first is the operating temperature. If the SMD LED works at a higher temperature, its light decay speed will be significantly accelerated. This is because high temperature will accelerate the aging of semiconductor materials and the performance degradation of packaging materials. When the temperature rises, the carrier recombination efficiency inside the chip decreases, resulting in a decrease in luminous efficiency. Therefore, a good heat dissipation design is crucial to slow down the light decay. By using heat dissipation measures such as heat sinks and thermal conductive adhesives, the operating temperature of SMD LEDs can be effectively reduced, thereby slowing down the light decay speed.
The second is the driving current. If the SMD LED works for a long time at a current exceeding its rated current, the light decay speed will also be greatly accelerated. Excessive current will cause the chip to generate too much heat, and will also accelerate the formation and diffusion of defects inside the chip, thereby reducing the luminous efficiency. Therefore, when using SMD LEDs, they should be driven strictly according to their rated current to ensure their normal service life and stable luminous performance.
In addition, the quality of the packaging material also has a great influence on the light decay rate. High-quality packaging materials have good heat resistance, light resistance and sealing, which can effectively protect the chip and slow down the light decay. Low-quality packaging materials may have problems such as yellowing and cracking in a shorter period of time, thereby affecting the luminous efficiency and life of the LED.
Environmental factors cannot be ignored either. If the SMD LED is in a harsh environment such as humidity, high temperature, and high ultraviolet light for a long time, the light decay rate will be significantly accelerated. For example, a humid environment may cause the packaging material to become damp, affecting its optical properties and electrical insulation; a high ultraviolet environment will cause the packaging material to age and turn yellow, reducing the light transmittance.
In general, the light decay rate of SMD LED light emitting diodes is a gradual process, which is affected by a combination of multiple factors. In order to slow down the light decay and extend the service life of SMD LEDs, these factors need to be fully considered during the design, manufacturing and use process, and corresponding measures need to be taken, such as optimizing heat dissipation design, reasonably controlling drive current, selecting high-quality packaging materials, and avoiding harsh environmental conditions.
