Spectrally tunable stacked OLED

US11844230B2 · kind B2 · utility

Assignee

• OLEDWORKS GMBH · DE

Inventors

• Jeffrey Spindler · Ridgecrest, US
• Marina E. Kondakova · Kendall, US

Key dates

• Filing date: Feb 10, 2021
• Grant date: Dec 12, 2023
• Expiry date: Jul 31, 2041

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10K2102/3035

Abstract

An OLED lighting device comprising: a blue light-emitting unit with a blue-light fluorescent, phosphorescent or TADF emitter; a yellow light-emitting electroluminescent unit comprising a green phosphorescent emitter, a red phosphorescent emitter and at least one non-emitting host; wherein the blue light-emitting unit and the yellow light-emitting unit are separated by a mixed interlayer with two non-emitting charge-carrier materials. Desirably, the yellow-light emitting unit essentially consists of a green phosphorescent emitter, a red phosphorescent emitter and a single non-emitting host. The mixed interlayer desirably has more than 50% of a hole-transporting material and an electron-transporting material. The Triplet Energy of both materials in the mixed interlayer can be higher than the Triplet Energies of the R and G phosphorescent dopants. The HOMOs of both materials in the mixed interlayer are more negative than the HOMO of the host in the yellow unit but less negative than the HOMO of the host in the blue unit. The LUMOs of the materials in the mixed interlayer can be more negative than the LUMO of the host in the yellow unit but less negative than the LUMO of the host in th…