Organic electroluminescent element
AssigneeFuji Photo Film Co., Ltd.
InventorHiroshi Tada
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Abstract
The present invention provides an organic electroluminescent element including, between an anode and a cathode, at least a luminescent layer and a hole blocking layer that is adjacent to the cathode side of the luminescent layer, wherein the luminescent layer includes a phosphorescent material and a host material, the hole blocking layer includes a phosphorescent material and an electron transport material, the phosphorescent material contained in the luminescent layer and hole blocking layer is the same, and the ionization potential IP (ET) of the electron transport material contained in the hole blocking layer is greater than the ionization potential IP (EM) of the phosphorescent material by 1 eV or more.
Claims16
An organic electroluminescent element comprising, between an anode and a cathode, at least a luminescent layer and a hole blocking layer that is adjacent to the cathode side of the luminescent layer, wherein the luminescent layer comprises a phosphorescent material and a host material, the hole blocking layer comprises a phosphorescent material and an electron transport material, the phosphorescent material contained in the luminescent layer and the hole blocking layer is the same, and the ionization potential IP (ET) of the electron transport material contained in the hole blocking layer is greater than the ionization potential IP (EM) of the phosphorescent material by 1 eV or more.
Dependencies are inferred from the claim text.