Organic light-emitting diode comprising at least two electroluminescent layers

US8735879B2 · kind B2 · utility

Assignee

• COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES · FR

Inventors

• David Vaufrey · Grenoble, FR
• Frédéric Sermet · Voiron, FR

Key dates

• Filing date: Apr 4, 2011
• Grant date: May 27, 2014
• Expiry date: Apr 4, 2031

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10K2101/30

Abstract

The invention provides an organic light-emitting diode which includes at least two electroluminescent layers (ELR, ELB), both of which are fluorescent or phosphorescent and emit at different wavelengths, as well as a hole- and electron-conducting buffer layer (T) arranged between the electroluminescent layers. The buffer layer is a bi-layer having an electron-transport layer (T2) and a hole-transport layer (T1), each one of the hole- and electron-transport layers being made of one or more materials in which the HOMO level(s) are comprised between or equal to the HOMO levels of the electroluminescent layers, and in which the LUMO levels are between or equal to the LUMO levels of said electroluminescent layers, with a tolerance of 0.3 eV.