Back to results
US 9,853,220 B2Granted
Efficient organic light-emitting diodes and fabrication of the same
AssigneeNitto Denko Corporation
InventorLiping Ma
Life of this patent
Estimating the term…
Abstract
Light-emitting devices comprising light-emitting diodes are described herein. These devices may include a substrate, a reflective anode, a hole-injection layer, a hole-transport layer, an emissive component, an electron-transport layer, a cathode, an enhancement layer, and a light-scattering layer. The emissive component may include first and second fluorescent light-emitting layers with an intervening phosphorescent light-emitting layer or first and second phosphorescent light-emitting layers with an intervening fluorescent light-emitting layer.
Claims21
A light-emitting device comprising:
- a substrate;
- a reflective anode over the substrate;
- a hole-injection layer over the reflective anode;
- a hole-transport layer over the hole-injection layer;
- an emissive component over the hole-transport layer, wherein the emissive component comprises:
- a first fluorescent light-emitting layer;
- a second fluorescent light-emitting layer;
- and
- an intervening phosphorescent light-emitting layer disposed between the first fluorescent light-emitting layer and the second fluorescent light-emitting layer;
- or wherein the emissive component comprises:
- a first phosphorescent light-emitting layer;
- a second phosphorescent light-emitting layer;
- and
- an intervening fluorescent light-emitting layer disposed between the first phosphorescent light-emitting layer and the second phosphorescent light-emitting layer;
- an electron-transport layer over the emissive component;
- a semi-transparent or transparent cathode over the electron-transport layer;
- an enhancement layer over the semi-transparent or transparent cathode;
- and
- a light-scattering layer over the enhancement layer;
- wherein the first fluorescent light-emitting layer, the second fluorescent light-emitting layer, and the intervening fluorescent light-emitting layer each comprises a fluorescent ambipolar host material selected from the group consisting of:
17 more elements
Dependencies are inferred from the claim text.