Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
August 11, 2009
Patent Application Number
11109804
Date Filed
April 20, 2005
Patent Primary Examiner
Patent abstract
An organic electroluminescent device including a pair of electrodes and at least one organic compound layer including a luminescent layer between the pair of electrodes, in which the luminescent layer contains at least one host material and at least one phosphorescent material, and the concentration of the phosphorescent material changes periodically in the depth direction of the luminescent layer.
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