Abstract
Phosphor and silicone are common used packaging materials in LED fabrication and have great influence on the reliability of LED modules. In order to understand the effect of these materials, test LED samples were prepared with different sets of packaging materials. An aging test at a constant temperature of 125°C was performed to discover the failure process. The results of aging test shown that the luminance of all samples fell obviously. But the luminance decrease of samples without phosphor and silicone was the least. As to other samples, the carbonization of silicone and the consequent bubbles reduced the luminance rapidly. And the phosphor had the similar influence on the luminance. If phosphor and silicone were used at the same time, the luminance would reduce quickly and then the modules would fail.
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