Synthesis and application of pyridine-based ambipolar hosts: control of charge balance in organic light-emitting devices by chemical structure modification.
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.
Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, Washington 99352, USA.
Phillip K
PK
Koech
Evgueni
E
Polikarpov
James E
JE
Rainbolt
Lelia
L
Cosimbescu
James S
JS
Swensen
Amber L
AL
Von Ruden
Asanga B
AB
Padmaperuma