The effects of processing conditions on the efficiency and lifetime of organic light emitting devices incorporating a new oxadiazole derivative

摘要

The effects of processing conditions on the properties of organic light emitting devices (LEDs) based on rubrene-doped poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylene vinylene] and a new electron transporting material,2,5-bis[2-(4-tert-butylphenyl)-1,3,4-oxadiazol-5-yl]pyridine,are reported.These dual-layer LEDs exhibited a higher quantum efficiency than observed for structures incorporating the more widely used electron transport compound 1,3-bis[2-(4-tert-butylphenyl)-1,3,4-oxadiazol-5-yl]benzene (OXD-7).However,the as-prepared devices degraded relatively rapidly on storage (10~(-1) mbar,no applied bias).Thermal annealing of the degraded devices at 160degC for 30 minutes restored the currents and light outputs close to those measured for fresh devices.The annealed LEDs exhibits a significant increase in their operating lifetime.Lifetime improvements could also be achieved by increasing the deposition rate and thickness of the thermally evaporated aluminium top electrode.These effects are attributed to better adhesion between the aluminium top electrode and the underlying electron transport layer.