NU 2003-071
Inventors
Qinglan Huang
He Yan
Tobin J. Marks
Short Description
A new hole transport system for polymer light emitting diodes
Abstract
Northwestern researchers invented a new hole transport system for polymer light emitting diodes (PLEDs) with negligible visible light absorption, stability to ITO, solvent resistance and tunable electronic properties. PLEDs are of increasing interest in a wide range of display applications. However, conventional hole transport layer poly(3,4-ethylenedioxythiophene)-poly(stryenesulfonate) (PEDOT-PSS) devices exhibit significant visible light absorption and ITO interface instability. By cross-linking siloxane-derivatized hole-transport material (TPD-Si2) with hole transporting or insulating polymers, the investigators address the above limitations. Further, spin coating a TPD-Si2/TFB blend on ITO with thermal curing not only creates a strongly adherent cross-linked network but further provides an efficient hold transport layer that is stable to subsequent solvent coating operations.
Applications
Advantages
IP Status
Issued US Patent No. 7,449,509