"ORGANIC: The glitch may be in makeup of organic polymer molecules"
Organic materials consist of long chains of protein molecules repeatedly linked with smaller carbon-based molecules (hence the term "organic"). Unlike semiconducting crystals, which are small interlocking molecules, organic polymer semiconductors are composed of very large, chainlike molecules repeatedly linked with smaller carbon molecules. Like all of the things that foster life, air and water also affect organic semiconductors like OLEDs, but they do so negatively. The corrosive effects of oxygen, moisture and high temperatures lead to "denaturing" in any organic molecule. Denaturing means the long complex folded interlocking strands of the organic molecule unravel, thereby eliminating its former functions. In living things, denaturing means the protein dies; in organic semiconductors, it's just as bad.
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Text: http://www.eetimes.com/story/OEG20030923S0056