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What kind of materials are used to make OLEDs? |
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George (2009-3-18) |
| What kind of materials are used to make OLEDs?
OLED materials can be divided into small- and large- molecules. Small Molecules OLEDs are more common today, with most displays using those kind of materials. Large Molecules (also called Polymer-based OLEDs, or P-OLEDs) are lagging behind in lifetime and efficiency specs. P-OLEDs might be easier to make, though, because they are more easily adapted for printing. Indeed, one can ink-jet-print an OLED, which is a great way to make them.
OLEDs can also be classified based on another property of the material ¨C
whether it is fluorescent or phosphorescent. Most displays today are built using fluorescent materials, while Phosphorescent OLEDs (PHOLEDs) promise to deliver even more efficient displays. Sometimes the display use a mix of fluorescent and phosphorescent materials ¨C for example Samsung SDIs displays use Red PHOLEDs and fluorescent red and green.
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