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US 2014/0197401 A1Published application
Organic electroluminescence device
AssigneeMerck Patent GmbH
InventorsJonas Valentin Kroeber, Frank Voges, Susanne Heun, Joachim Kaiser
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Abstract
The present invention relates to organic electroluminescent devices which comprise a mixture of at least two materials in the electron-transport layer.
Claims21
1-16. (canceled)
An organic electroluminescent device comprising anode, cathode, at least one emitting layer and at least one electron-transport layer which is directly adjacent to the emitting layer on the cathode side, wherein the electron-transport layer comprises a mixture of at least two materials ETM1 and ETM2, where the following conditions apply to ETM1 and ETM2:
- a) T1(ETM1)>2.2 eV;
- and
- b) T1(ETM2)>2.2 eV;
- and
- c) −3.2 eV<LUMO(ETM1)<−2.0 eV;
- and
- d) LUMO(ETM2)>LUMO(ETM1);
- where T1 stands for the lowest triplet energy of the respective material and LUMO stands for the energy of the lowest unoccupied molecular orbital of the respective material.
5 more elements
Dependencies are inferred from the claim text.