US 2017/0256743 A1 · Light-Emitting Element, Light-Emitting Device, Electronic Device, and Lighting Device

Abstract

To provide a novel light-emitting element or a novel light-emitting device with high emission efficiency and low power consumption, a light-emitting element having a plurality of light-emitting layers between a pair of electrodes includes a lower electrode, a first light-emitting layer over the lower electrode, a charge-generation layer over the first light-emitting layer, a second light-emitting layer over the charge-generation layer, and an upper electrode over the second light-emitting layer. An emission spectrum of the first light-emitting layer peaks at a longer wavelength than an emission spectrum of the second light-emitting layer. A distance of between a bottom surface of the upper electrode and a bottom surface of the first light-emitting layer is less than or equal to 130 nm.

Claims15

Dependent claims

A light-emitting element comprising:

a lower electrode;
a first light-emitting layer over the lower electrode;
a charge-generation layer over the first light-emitting layer;
a second light-emitting layer over the charge-generation layer;
and
an upper electrode over the second light-emitting layer,
wherein an emission spectrum of the first light-emitting layer includes a peak at a longer wavelength than an emission spectrum of the second light-emitting layer, and
wherein a distance between a bottom surface of the upper electrode and a bottom surface of the first light-emitting layer is less than or equal to 130 nm.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application

15/596,341Filed 16 May 2017

Priority

JP 2014-21687624 Oct 2014

Published

7 Sep 2017

Term ends

Not estimatedThe source records don’t support an estimate.

Classification7 codes

H10K 50/131
Comprising stacked EL layers within one EL unit: with spacer layers between the electroluminescent layers
H10K 50/125
Characterised by the electroluminescent [EL] layers: specially adapted for multicolour light emission, e.g. for emitting white light
H10K 50/13
Specially adapted for multicolour light emission, e.g. for emitting white light: comprising stacked EL layers within one EL unit
H10K 59/40
Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00: oLEDs…

Light-Emitting Element, Light-Emitting Device, Electronic Device, and Lighting Device

Life of this patent

Light-Emitting Element, Light-Emitting Device, Electronic Device, and Lighting Device

Life of this patent

Abstract

Claims15