We studied the relaxation of electroluminescence roll-off characteristics by changing the dopant concentration and thickness of the emitting layer in organic blue electrophosphorescence diodes composed of a 2,6-dicarbazolo-1,5- pyridine host doped with iridium(III)-bis[(4,6-di-fluorophenyl)-pyridinato-N, C2]picolinate. Analyzing the roll-off characteristics using the theoretical models of triplet-triplet annihilation and triplet-polaron annihilation (TPA), we found that the roll-off characteristics of these devices were determined primarily by TPA.
All Science Journal Classification (ASJC) codes
- General Engineering
- General Physics and Astronomy