Electron injector material boosts OLED performance

Edited by the Electronicstalk editorial team May 20, 2008

In third-party-verified tests, E225 exhibited a 66% performance improvement in brightness and 30% reduction in driving voltage.

OLED-T has developed a new electron injector material and has published the results of third-party-verified performance tests.

In the tests, the new E225 electron injector material exhibited a 66% performance improvement in brightness and 30% reduction in driving voltage.

These results are based of test displays where E255 was used in combination with OLED-T's electron injector EI-101 and compared with standard configurations of electron injector and transport materials typically used as the industry benchmarks.

A phosphorescent red display device using a combination aluminium quinolate (AlQ3) as the electron injector and lithium fluoride (LiF), as the electron transport had a brightness of 9.8 lumen/W, whereas by replacing the injector and transport layers for a combination of OLED-T's E225 and EI-101, respectively, the brightness improved to 16.3 lumen/W.

Display devices were driven for more than 520 hours at a current of 40mA/cm2.

The voltage required to drive the devices at 1000cd/m2 was cut by 30%.

The industry benchmark materials of AlQ3 and LiF required a driving voltage of 7.7V.

Using a combination of OLED-T's E225 and EI-101 reduced this to 5.4V.

Myrddin Jones, CEO, OLED-T, comments: "OLED-T is delighted with the third party results for this new electron transport and injector material set".

"The results show a step improvement on existing industry standard materials".

Details of the third party characterisation results for E225 are available from OLED-T but an industry standard confidentiality agreement prevents OLED-T from naming the third party.