LED chemistry incompatibility test to see which chemicals LEDs can be used with

There are many factors affecting the life of LED lighting fixtures. In addition to the most common heat dissipation defects, LED dead lights or light decays due to application experience. The cause of discoloration is also caused by chemical contamination in the manufacturing process:

For the downstream application side, in addition to the proper heat dissipation solution, in addition to the process of luminaire assembly, or the chemical additives of the manufacturing process, it is necessary to avoid the so-called chemical substances that are not compatible with the volatile organic compounds in the nine LED lighting fixtures. It can quickly damage the LEDs of any manufacturer. This chemical incompatibility is often a local phenomenon occurring at elevated temperatures and in sealed lamps with little or no air flow.

After testing by the LED packaging factory, it is found that some chemicals that are known to easily affect the normal function of the LED, the user end is best to establish a comprehensive chemical incompatibility test evaluation system. With proper precautions, design and testing, the impact can be minimized or eliminated.

Designers should take full account of minimizing the effects of chemicals (mainly LED's primary optical lens Molding glue and various chemicals used in electronics assembly and luminaires), as these items may be damaged together The light output efficiency of the LED can even cause permanent failure of the LED (such as dead lights, discoloration, dark light, etc.). Because of chemical incompatibility and excessive LED package temperature, the result of LED failure is the same: luminous flux attenuation, color temperature drift.

Which chemicals can LEDs be used with, and what types of potting compounds? Can you fill the glue? What effect does potting have on LEDs?

In the case of chemicals affecting LEDs:

1. The EDS analysis results of the LED lens of the bad sample are as follows:

2. The EDS factor analysis results for the defective sample LEDSilicone. The abnormal elements such as Na and Cl appear as follows:

This board was checked and it was found that there was a potential chemical contaminant, that is, a coating with a bonding lens appeared in the vicinity of the LED element (such as the above lens), and the LED and the bonding coating were adversely affected by the chemistry of the LED. This chemical is not compatible with the LED package body, resulting in permanent failure of the LED. It is therefore extremely important to understand and prevent the incompatibility of these LEDs with the chemicals used in the luminaire.

Silicone (silicon) is a silicone material used on various high-power LEDs, such as CreeXPE's LEDs. After being uniformly mixed, it is injected into a mold and cured under a certain temperature condition for a certain period of time. During curing, the siloxane does not form any fixed shape or structure, but instead they cure into random shapes of varying lengths and shapes. This produces a slightly gelatinous and elastic silicone. That is to say, these silicone materials are filled with small holes, so the silicone has gas permeability and moisture permeability. Potting compound materials commonly used in light bulbs, or other solid-state lighting products, such as potting compounds, aprons, gaskets, during assembly or processing, under the influence of elevated temperatures, these volatile organic compounds Will evaporate the gas.

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