Optical epoxy for LED having good thermal shock resistance.

somashekar

Staff member
Super Moderator
#1
Helloo experts ....
We are developing a new emitter for our customer for a new range of sensors
We make emitters used in the sensors of patient monitors.
Red and IR LED are mounted and wire bond on the gold plating in a ceramic substrate. The substrate has a small cup for the devices mounting, wirebonding and the optical epoxy fill.
We use a single part optical epoxy Bondline 6570 at present and cure per spec in oven @ 90'C.
We face a challenge here in the soldering process of the sensor cable wire to the ceramic pads, which are on the reverse side of the ceramic substrate. It is observed that the heat on the gold pads during the soldering has an effect on the optical epoxy that we use. In sense, it is noticed after soldering that the epoxy shows signs of separation from the ceramic cup.
We are now looking for a good optical epoxy (single or 2 part) to be able to withstand short term thermal shock.
Do anyone have experience of similar application and a solution....
:thanx:
 
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Marc

Hunkered Down for the Duration
Staff member
Admin
#2
Does anyone here have any background / experience that can shed some light on this person's problem?
 

arios

Your Mexican Amigo
#3
It's not my area of experience but, Have you considered conductive epoxies instead of soldering? It looks like conductive epoxies are more friendly to temperature sensitive components and you may not need to worry about the temp. shock

It's just a thought so you will need to explore more.

I found this example doing a quick search:

http://www.mgchemicals.com/products/8331.html

Dear modetarors and other folks from the Olimpus: this is not a commercial so please let Somashekar take a look.
 
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