1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

About LEDs technical question - very hard to solve

  1. Oct 7, 2012 #1
    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)
     
  2. jcsd
  3. Oct 7, 2012 #2
    I'd suppose heat heals some damage. For instance when hot electrons are injected into insulators, heat helps the electrons flow back.
     
  4. Oct 7, 2012 #3
    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.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: About LEDs technical question - very hard to solve
  1. LED Circuit Question (Replies: 1)

Loading...