Patent ID: 9587172
Date: 2017-03-07
CPC Classifications: C09K,H01L,H05B

Claim:
1. An inverted structure OLED (organic light emitting diode) comprising: a substrate; a transparent cathode that is disposed on the substrate; a transparent anode; and an organic material layer that is disposed between the transparent cathode and the transparent anode, wherein the organic material layer comprises an n-type doped first electron transport layer, a second electron transport layer adjacent thereto, a light emitting layer adjacent thereto, a hole transport layer adjacent thereto, and a hole injection layer adjacent thereto, that are disposed on the transparent cathode, wherein the n-type doped first electron transport layer comprises an electron transport material and an n-type dopant, wherein the n-type dopant comprises at least one that is selected from the group consisting of NaF, CsF, MgF wherein the electron transport material comprises one or more compound that comprises at least one functional group selected from the group consisting of an imidazole group, an oxazole group, and a thiazol group, wherein the inverted structure OLED emits light through both the transparent cathode and the transparent anode, wherein the transparent cathode and the transparent anode are formed of at least one transparent metal oxide that is selected from ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide), and ZnO (Zinc Oxide), wherein the n-type doped first electron transport layer is in direct contact with the transparent metal oxide of the transparent cathode, wherein the n-type dopant has a concentration gradient in a thickness direction of the n-type doped first electron transport layer, wherein the n-type dopant exists in a content of 1 to 50 wt % within 50% of a thickness of the n-type doped first electron transport layer at a transparent cathode side, and wherein the transparent anode is disposed adjacent to the hole injection layer which comprises the compound of the following Formula 23: wherein R