About LEDs technical question - very hard to solve

[M.Caffery]

In a COB product with FR-4 substrate, blue light chip excites yellow phosphor to form white light.
Why is room temperature aging attenuation higher than 85 degree/85% RH aging attenuation?
(After 1000h lighting, Attr=7% while Att85=1%)

(If you have further questions about how I do the experiment, ask me here)

 

[Enthalpy]

I'd suppose heat heals some damage. For instance when hot electrons are injected into insulators, heat helps the electrons flow back.

 

[M.Caffery]

I'd suppose heat heals some damage. For instance when hot electrons are injected into insulators, heat helps the electrons flow back.

Good thought!
I was thinking whether high temperature and humidity affects phosphor and colloid so that the possibility of attenuation caused by phosphor might be lowered.