Supresil™: Novel technology to increase pot life of Silicones used in LED components

Credit: JOANNEUM RESEARCH /Sabine Suppan

Most LED components use special silicones (PDMS) as matrix for the colour conversion phosphors, or as the favourite material for primary optical lenses attached to the LED package. In LED production, two component systems of such elastomers are preferred. Upon mixing of the two components the curing process of the silicones starts almost immediately, and the mixture usually has a pot life limited to a maximum of few hours at room temperature. This poses significant practical and technological limitations for its use, especially in LED production, where additional color conversion phosphors are added to the mixture.

The formulation for a Silicone elastomer, developed by JOANNEUM RESEARCH MATERIALS, can lead to significantly reduced production costs for LED components.


  • Using this novel method to stabilize PDMS elastomer systems, the pot time of silicon mixtures (including color conversion phosphors) can be extended to several months and beyond.
  • This is reducing the processing efforts and increasing the yield of color conversion material in LED-production considerably.
  • After deposition, normal curing occurs at temperatures even below 80°C, leading to a fast and complete curing.
  • No change of optical properties of the PDMS and the LED are observed.
  • The modified silicones can be mixed with color conversion phosphors in rather large batches, increasing the accuracy and consistency of the color conversion pastes.

The novel technology is patent pending. We are looking for partners in the LED, phosphor and PDMS market to exploit the potential of this technology.

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