Monday, August 18, 2014

Root cause of why LEDs changes colour, turn yellow over time

Having a problem with spoilt LEDs, LEDs turning yellow or having inconsistent LED light colours within months?


Through working with Nichia Corporation (World no.1 LED chipset manufacturer) from Japan, we came across one of their publication discussing the issue above. The article focuses on lumens maintenance and colour maintenance

In summary and simplicity, some reasons mentioned are;
1. LEDs have plastic components that contain Benzene ring that degrade with photon energy - That makes the white portion of LED packages turn yellow.
2. Heat from the LEDs in operation.

Solutions;
1. Use thermoset composite and inorganic materials for better reflectivity and stronger structural stability.

The Nichia white paper / article has been uploaded with permission at the following link;

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