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:
Jan. 24, 2017
Filed:
May. 30, 2013
Panasonic Intellectual Property Management Co., Ltd., Osaka, JP;
Varutt Kittichungchit, Osaka, JP;
Kazuyuki Yamae, Nara, JP;
Abstract
The disclosure relates to an organic electroluminescence element including an organic layer including multiple light-emitting layers. The light-emitting layers include a blue light-emitting layer including a blue light-emitting dopant. In a case where emission color of the organic electroluminescence element operated at an operation temperature for a stable state is represented in a CIE1931 chromaticity coordinate system, when coordinate point A of the emission color at an early stage of use and coordinate point B of the emission color deteriorated by use are represented by (x, y) and (x, y) respectively, a relation of y≧yis satisfied. When amounts of changes in x and y values from coordinate point A to coordinate point B are represented by equations of Δx=x−xand Δy=y−yrespectively, a relation of Δy≧Δx is satisfied. It can be made difficult to perceive change in emission color and lifetime can be prolonged