Saxat från Oled-info.com
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Basically you can make OLEDs from two kinds of materials: small-molecule (SM-OLED) or large-molecules, or polymers. Virtually all OLED displays on the market toady are using Small Molecules, as P-OLEDs are less efficient and suffer from lower lifetime.
P-OLEDs however are more easily adapted for printing (solution-processable) and so several companies believe that P-OLEDs are the best way to create large OLED panels using printing methods.
http://www.oled-info.com/p-oled
