Synthesis and Application of Pyridine-Based Ambipolar Hosts: Control of Charge Balance in Organic Light-Emitting Devices by Chemical Structure Modification

Abstract

We studied the influence of a pyridine moiety versus a phenyl moiety when introduced in the molecular design of an ambipolar host. These pyridine-based host materials for organic light-emitting diodes (OLEDs) were synthesized in three to five steps from commercially available starting materials. The isomeric hosts have similar HOMO/LUMO energies; however, data from OLEDs fabricated using the above host materials demonstrate that small structural modification of the host results in significant changes in its carrier-transporting characteristics.

Nearly 100% Internal Quantum Efficiency in Undoped Electroluminescent Devices Employing Pure Organic Emitters

“…The T 1 level of 2.7 eV of TPBI is comparable to the 2.7 eV level of DMAC–BP (Figure S2b, Supporting Information). The 3.1 eV level of PO15 is higher than the 2.9 eV level of DMAC–DPS . The double layer OLEDs performed better than the single layer devices.…”

Phosphorus‐Containing Materials for Organic Electronics

“…Padmaperuma et al also studied the electronic effects of directly attaching a pyridyl moiety on a phosphane oxide (9, 10, Figure 2) in an investigation toward ambipolar materials. [12] The strategy behind this study was to incorporate the pyridyl moiety as an enhanced electron-transport unit that would improve both electron transport and injection. To obtain an ambipolar material, the authors chose the wellknown hole transport moieties carbazole and triphenylamine, respectively.…”

Theoretical Study of Dibenzothiophene Based Electron Transport Materials

“…The element numbers are shown in Figure 3. Although Dunning's correlation consistent basis sets have had redundant functions removed and have been rotated in order to increase computational efficiency [11][12][13][14][15][16][17], the computer time needed for 6-31G* calculations are still shorter. From the data it is clear that the higher level of basis set does not provide an accurate description of the geometry.…”