Improving the Electroluminescence of [Zn(salophen)(OH₂)] in Polyfluorene-Based Light-Emitting Diode: The Role of Energy Transfer and Charge Recombination

The Balance between Charge Mobility and Efficiency in All-Solution-Processed Organic Light-Emitting Diodes of Zn(II) Coordination Compounds/PFO Composites

“…In a recent study, we prepared some Zn­(II)-based coordination compounds looking for an application in OLEDs with external efficiencies comparable to Alq 3 . , Zn­(II) was chosen once it is also very abundant, along with the fact that this ion coordinated to the synthesized tetradentate Schiff bases resulted in coordination compounds with a geometry not often seen. − These compounds are based on salophen derivatives as ligands, resulting in systems with good thermal and chemical stabilities. Some of them have comparable emission quantum yields, but the charge mobility values were still an issue due to the chosen deposition method. , In such a study, the approach used by our group was the fabrication of diodes using solution-processed protocols, where the coordination compounds were dissolved in a semiconductor polymer matrix . It is worth mentioning that an accurate selection of the semiconductor polymer is mandatory.…”

“…We observed that poly­[9,9-dioctylfluorenyl-2,7-diyl] (PFO) is a better host than poly­(9-vinylcarbazole) (PVK) because of its higher charge mobility and emission quantum yield . Moreover, the fabrication process combines the emissions from the polymer and the coordination compounds so that white emission could be obtained …”

“…In a recent study, we prepared some Zn(II)-based coordination compounds looking for an application in OLEDs with external efficiencies comparable to Alq 3 . 29,30 Zn(II) was chosen once it is also very abundant, 28 along with the fact that this ion coordinated to the synthesized tetradentate Schiff bases resulted in coordination compounds with a geometry not often seen. 31−33 These compounds are based on salophen derivatives as ligands, resulting in systems with good thermal and chemical stabilities.…”

“…29,31 In such a study, the approach used by our group was the fabrication of diodes using solution-processed protocols, where the coordination compounds were dissolved in a semiconductor polymer matrix. 30 It is worth mentioning that an accurate selection of the semiconductor polymer is mandatory. We observed that poly[9,9-dioctylfluorenyl-2,7diyl] (PFO) is a better host than poly(9-vinylcarbazole) (PVK) because of its higher charge mobility and emission quantum yield.…”

Synthesis of a Novel Zn-Salphen Building Block and Its Acrylic Terpolymer Counterparts as Tunable Supramolecular Recognition Systems

“…However, the use of Zn-Salphen building blocks as a broadly applicable strategy for developing molecularly tunable materials in polymer science is still in its early stages [29]. In the literature, these building blocks have been incorporated into polymeric systems using two main strategies: supramolecular functionalization to obtain Zn-Salphen-composites [30,31,32] and homo-polymerization to produce covalently linked Zn-Salphen oligomers [33,34]. Nevertheless, to date, their potential as a supramolecular tool for tailoring the functional properties of more complex co-polymer materials has remained underexploited.…”