We all know that the LED bulb is the abbreviation of LED, which is a popular term. LED lamp beads are prone to serious color temperature drift before and after dispensing, packaging and baking, especially large ones, such as 5050, 5730, etc.
Firstly, we analyze the causes of color temperature drift: during the curing process, some of the adhesives are cured first because of the uneven heating, which easily causes the fluorescent powder mixed in the adhesives to sink and disperse unevenly, resulting in the inconsistency of light refraction law and resulting in dispersion phenomenon, which is called color temperature drift.
Then, the methods to solve the color temperature drift are as follows: method 1: three-stage baking, the first stage 60 C/1h, the second stage 110 C/0.5h, and the third stage 150 C/3.0h. In the first stage of baking, because of the low temperature, the gel regeneration reaction is very mild, the whole gel will become thick and cured at the same time, there will be no problem of curing speed and slow, so that the phosphor can be uniformly distributed in the rubber; method 2 - if two-stage curing, such as 10. The anti-sedimentation powder can be added into the A adhesive at 0 / 1H + 150 / 3h, which can prevent the non-uniform sedimentation of powder during the curing process, thus avoiding the phenomenon of color temperature drift.
Secondly, it is necessary to know that the normal color temperature range is generally set at <10% of the color temperature. For example, the color temperature range of 3000K is 2700-3300K, and the color temperature range of 6000K is 5400-6600K. If the above range is exceeded, the color temperature is considered to be unqualified.
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