We demonstrate that benzo[1,2,3-kl:4,5,6-k′7′]dixanthene (BDX) derivatives show high-efficiency carrier injection in organic light-emitting diodes (OLEDs). Using 3,11-dibromobenzo[1,2,3-kl:4,5,6-k′T′] dixanthene (BDX6) as a hole injection layer (HIL), we achieved a low driving voltage of 8.12±0.10V in obtaining a current density of J = 100mA/cm 2. The hole injection characteristics were superior to those of a device with a conventional CuPc layer as a HIL. On the other hand, inserting benzo[1,2,3-kl:4,5,6-k′l′]dixanthene (BDX1) as an electron injection layer (EIL) efficiently decreased driving voltage, indicating a superior electron injection capability compared with a device without a BDX1 EIL. We show that carrier injection efficiency can be well controlled by the substituent groups of BDX, thus providing efficient hole and electron injection layers.
|Number of pages||2|
|Journal||Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers|
|Issue number||1 A|
|Publication status||Published - Jan 1 2005|
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)