cracks between electrical conductive adhesive and round the edge of the Chip-leds

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We are assembling SMD-Leds (Chip LED cl-220yg-c-ts)on flex ... - Aug 15, 2000 by George Verboven

George: I�d like to help, but I�m sorry I�m not familiar w... - Aug 21, 2000 by davef

George Verboven

#3308

cracks between electrical conductive adhesive and round the edge of the Chip-leds | 15 August, 2000

We are assembling SMD-Leds (Chip LED cl-220yg-c-ts)on flex foil with Electrical conductive glue (Matthey A1401). When we investigated these foils we found cracks between the conductive adhesive and round the edge of the Chip-leds. This cracks cause function problem (randomly flashing LED-s, or no light).

What can be the reason? How we can solve it. Or in which direction we have to put the investigation to solve this process error?

Please help!

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davef

#3309

Re: cracks between electrical conductive adhesive and round the edge of the Chip-leds | 21 August, 2000

George: I�d like to help, but I�m sorry I�m not familiar with your Matthey adhesive, can�t find information about it on the web, and can not picture the problem you are describing. Please post a picture and give us more detail. At least give us a picture or link to a vendor site of the LED, some material properties, process steps, and background on occurrence of the problem.

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