OLED displays are manufactured from a sandwich of different materials including the electron transport layer. This layer is critical to the efficiency, voltage, and lifetime of the total display based on the electron conductivity performance of the material.
E278ST has been developed as a like-for-like replacement in manufacturing lines for aluminium quinolate (Alq3), the electron transport layer most commonly used throughout the OLED industry.
E278ST provides significant technical and performance benefits compared with Alq3. The new electron transport material has lower toxicity, lower voltage, higher electroluminescent efficiency, longer lifetime and lower voltage drift.
In customer trials, OLED-T has demonstrated a two-fold increase in device lifetime and a 25 per cent reduction in device voltage. A fluorescent red device’s voltage was reduced from 8V to 6V at 500 cd/m2 and showed a 20 per cent power efficiency improvement. Voltage drift was reduced by 25 per cent over the first 500 hours of operation.
The new material is organic and contains no metals. The new material complements OLED-T’s already strong OLED material portfolio.
“E278ST offers superior performance as an electron transport material in both passive matrix and active matrix OLED displays compared with existing materials. It can be used as a direct replacement and upgrade path for aluminium quinolate, ensuring that display manufacturers can gain benefits using existing manufacturing processes,” said Myrddin Jones, CEO, OLED-T.
OLED-T will begin customer sampling of E278ST from the second quarter of 2008 and will commence volume production from the fourth quarter of 2008. The new material complements OLED-T’s already strong OLED material portfolio.