Effectiveness of tris-(8-Hydroxyquinoline) -aluminum doped with cesium-derivatives in organic light-emitting diodes

摘要

The effectiveness of Cs-derivatives, including cesium carbonate (Cs_2CO_3), cesium fluoride (CsF), and cesium nitrite (CSNO_3), as dopants of tris-(8-Hydroxyquinoline)-alutninum (Alq_3) in organic light-emitting diodes (OLEDs) were investigated via photoemission spectroscopy and current-voltage characteristics. The n-type doping of Cs_2CO_3 in Alq_3 is most effective. In current injection efficiency, the performance of OLEDs with CsF in cathode structures is similar to that with Cs_2CO_3, working well with both aluminum and silver in cathodes. As for CsNO_3, it is effective only with aluminum cathode due to the reaction between aluminum and CsNO_3.