The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 23, 2014
Filed:
Oct. 12, 2010
Ken Okamoto, Osaka, JP;
Ken Okamoto, Osaka, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
An organic EL element () includes a three-layer-structured light-emitting layer (). A first light-emitting layer () is made of a host material higher in HOMO than an organic light-emitting material (|HOMO (host material for first light-emitting layer)|>|HOMO (phosphorescence-emitting material)|). A second light-emitting layer () is made of a host material lower in LUMO than the organic light-emitting material (|LUMO (host material for second light-emitting layer) |<|LUMO (phosphorescence-emitting material)|). A third light-emitting layer () is made of a material higher in HOMO and lower in LUMO than the organic light-emitting material (|HOMO (host material for third light-emitting layer)|>|HOMO (phosphorescence-emitting material)|, |LUMO (host material for third light-emitting layer)|<|LUMO (phosphorescence-emitting material)|). This ensures transferring holes and electrons to the third light-emitting layer (). Consequently, a recombination ratio between holes and electrons increases, a voltage for driving the organic EL element () decreases, and light-emitting efficiency increases.