| Autor: |
Demir N; Solar Energy Institute, Ege University, Bornova, 35100 Izmir, Turkey., Karaman M; Department of Material Sciences and Engineering, Izmir Katip Celebi University, Cigli, 35620 Izmir, Turkey., Yakali G; Department of Engineering Sciences, Izmir Katip Celebi University, Cigli, 35620 Izmir, Turkey., Tugsuz T; Department of Chemistry, Hacettepe University, 06800 Beytepe, Ankara, Turkey., Denizalti S; Department of Inorganic Chemistry, Faculty of Sciences Department, Ege University, Bornova, 35100 Izmir, Turkey., Demic S; Department of Material Sciences and Engineering, Izmir Katip Celebi University, Cigli, 35620 Izmir, Turkey.; Central Research Laboratories, Izmir Katip Celebi University, Izmir, 35620 Izmir, Turkey., Dindar B; Solar Energy Institute, Ege University, Bornova, 35100 Izmir, Turkey., Can M; Department of Engineering Sciences, Izmir Katip Celebi University, Cigli, 35620 Izmir, Turkey.; Central Research Laboratories, Izmir Katip Celebi University, Izmir, 35620 Izmir, Turkey. |
| Abstrakt: |
Amber color emitting novel Ir(III) complexes were synthesized: [Ir(Meppy) 2 (Fpbpy)][PF 6 ] ( 1b PF 6 ), [Ir(Meppy) 2 (Fpbpy)][TFSI] ( 1b TFSI), [Ir(Meppy) 2 (MeObpy)][PF 6 ] ( 2b PF 6 ) and [Ir(Meppy) 2 (MeObpy)][TFSI] ( 2b TFSI), where Meppy = 2-( p -methylphenyl)-pyridine ( b ), Fpbpy = 4,4'-bis(4-fluorophenyl)-2,2'-bipyridine ( 1 ), and MeObpy = 4,4'-bis(4-methoxy)-2,2'-bipyridine ( 2 ). The photophysical and X-ray results showed that the complexes have aggregation-induced phosphorescent emission (AIPE) and a salt-induced polymorphism effect. The highest photoluminescence intensity was observed in complex 2b TFSI compared to other complexes in the solid state. Their theoretical absorption and phosphorescence emission transitions in acetonitrile were also investigated by using double- and triple-ζ basis sets with B3LYP and PBE0 hybrid functional. The best light-emitting electrochemical cell (LEC) performance was exhibited by complex 2b TFSI, and the data obtained were as follows: Luminance, current density, luminous efficiency, turn-on time, power efficiency, and external quantum efficiency were measured as 16 156 cd/m 2 , 554 mA/cm 2 , 8.49 cd/A, 17 s, 3.95 lm/W and 6.37%, respectively. The investigation of crystallographic characteristics have shown that the LEC performance of these complexes depends on cationic-anionic interaction which has a significant influence on molecular stacking of the molecules. Because, complex 2b TFSI, with weak cationic-anionic interactions, shows strong π···π stacking interactions between the adjacent molecules, it is the best lighting application candidate among the complexes. |
