Light-emitting element, light-emitting device, display device, electronic device, and lighting device

Patent metadata

Field	Value
Publication number	US-8994043-B2
Application number	US-201313904450-A
Country	US
Kind code	B2
Filing date	May 29, 2013
Priority date	Jun 1, 2012
Publication date	Mar 31, 2015
Grant date	Mar 31, 2015

Abstract

Disclosed is a light-emitting element comprising a plurality of light-emitting units which are separated from one another by a charge generation layer. The light-emitting units each have a light-emitting layer which is featured by a stack of two layers. Each of the two layers includes a host material and a phosphorescent material where the phosphorescent material in one of the two layers is blue emissive while the phosphorescent material in the other of the two layers exhibits a maximum emission peak in a range from 500 nm to 700 nm. The phosphorescent material exhibiting a maximum emission peak in a range from 500 nm to 700 nm may be different from light-emitting unit to light-emitting unit. An additive may be included in at least one of the two layers so that an exciplex is formed with the host material.

First claim

What is claimed is:

1. A light-emitting element comprising:
a first electrode;
a first light-emitting unit over the first electrode, the first light-emitting unit comprising a first light-emitting layer;
a second light-emitting unit over the first light-emitting unit, the second light-emitting unit comprising a second light-emitting layer; and
a second electrode over the second light-emitting unit,
wherein:
the first light-emitting layer comprises:
a first layer compris…

Assignees

• Semiconductor Energy Lab

Inventors

• Seo Satoshi
• Ohsawa Nobuharu

Classifications

• H01L27/3206 Primary

  Electricity · mapped topic

• H01L51/504

  Electricity · mapped topic

• H01L51/5036

  Electricity · mapped topic

• H01L51/5024

  Electricity · mapped topic

• H10K2101/10

  Electricity · mapped topic