Organic light-emitting diode comprising different matrix compounds in the first and second electron transport layer

US11081652B2 · kind B2 · utility

Assignee

• Novaled GmbH · DE

Inventors

• Ulrich Denker · Dresden, DE
• Mike Zöllner · Dresden, DE
• Katja Gräf · Dresden, DE
• Volodymyr Senkovskyy · Dresden, DE
• Bodo Wallikewitz · Dresden, DE
• Johannes Scholz · Dresden, DE
• Julien Frey · Dresden, DE

Key dates

• Filing date: May 11, 2016
• Grant date: Aug 3, 2021
• Expiry date: Aug 16, 2037

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10K2102/00
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The present invention is directed to matrix compounds and an organic light-emitting diode (OLED) comprising an emission layer and an electron transport layer stack of at least two electron transport layers, wherein a first electron transport layer and a second electron transport layer comprises at least one matrix compound, wherein the matrix compound or compounds of the first electron transport layer is/are different to the matrix compound or compounds of the second electron transport layer; and in addition, the first electron transport layer comprises a dopant of a lithium halide and/or lithium organic complex; and the second electron transport layer is free of a dopant; wherein at least one matrix compound of the second electron transport layer having the chemical formula Ia, Ib and/or Ic: (Ia) (Ib) (Ic) wherein Ar=substituted or unsubstituted arylene with 6 to 20 ring-forming carbon atoms; or carbazolylene; ET=substituted or unsubstituted aryl group with 13 to 40 ring-forming carbon atoms; or a substituted or unsubstituted heteroaryl group with 14 to 40 ring-forming atoms.