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What is LED light decay?
- Aug 27, 2018 -

1. What is LED light decay?

The light decay of LED products is the weakening of the signal in the transmission of light. At this stage, the LED products produced by the global LED manufacturers have different degrees of light decay. The LED emission tube also has light decay, which has a direct relationship with temperature. It is determined by chip, phosphor and packaging technology. At present, the light fade of white LEDs on the market may be one of the top issues for civilian lighting.

2. Two factors affecting LED light decay

1) LED quality issues

The LED chip used is not good, and the brightness is attenuated faster.

There is a defect in the production process, and the heat dissipation of the LED chip cannot be well derived from the PIN pin, resulting in an excessive temperature of the LED chip, which intensifies the chip attenuation.

2) Conditions of use

? LED is a constant current drive, and some LEDs use voltage drive to attenuate the LED.

• The drive current is greater than the rated drive condition. In fact, there are many reasons for the light decay of LED products. The most critical issue is the hot issue. Although many manufacturers do not pay special attention to heat dissipation in secondary products, the long-term use of these secondary LED products will reduce the degree of light attenuation. LED products should be high. The thermal resistance of the LED chip itself, the influence of the silver paste, the heat dissipation effect of the substrate, and the colloid and gold wire are also related to the light decay.

One of the main problems currently faced by white LEDs is the longevity problem. Since the price of white LEDs is still very high, if you want to establish a foothold in the lighting market and let users save electricity and save money, they must make up for the long-life and saved electricity bills. The high price of the luminaire. For now, the life of white LEDs makes it difficult to do this.

From the normal use of LED launch tubes, the most important factor affecting LED life is heat. The source of heat is the Joule heat generated by the normal resistance of the material, the heat generated by the PN junction, the Joule heat generated by the parasitic resistance brought about by the process, and the heat generated by the attraction of the light. The accumulation of heat causes the temperature to rise, and the temperature rise causes the performance of the chip to decline, degenerate, and denature.