Reasons to Cause Light Degradation of LEDs

02 Sep

LED lighting products’ light degradation is the signal decreases during the transmission of light, but at the present stage, the global LED manufacturers make LED products with different degrees of light degradation, light degradation of high power LEDs also exists, which is directly related to temperature, and the main factors which decide the degree of light degradation are chip, phosphor and packaging technologies. At present, light degradation of white LEDs in the market may be the first problem which prevents them from entering the civilian lighting problems. There are two main factors which cause the light degradation of LEDs:

1. LED products’ quality problems:
1) Quality of LED chips is bad, and brightness degrades fastly. 2) There are some defects in production process, the heat that LED chips generate can not be dispersed fully from the PIN foot, which results in the high temperature of LED chips and the fast degradation of brightness.

2. Operating condition problems:
1) LEDs are driven by constant current driver, but some LEDs are driven by voltage, which causes the light degradation of LEDs.
2) Driving current is higher than the rated driving condition.

There are many reasons that cause light degradation of LEDs, and the most critical issue is thermal issue, although many manufacturers do not particularly pay attention to heat dissipation problems of  secondary products, but these secondary LED products will have a higher degree of light degradation than those LED products which pay much attention on heat dissipation. The thermal resistance of LED chip itself, the impact of silver epoxy, the heat dissipation effect of substrate, colloid and gold thread also affect the light degradation of LEDs.

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