INVERTED ORGANIC LIGHT-EMITTING DIODE AND FLAT DISPLAY DEVICE COMPRISING THE SAME

摘要

PURPOSE: An inverted organic light emitting diode and a flat display device including the same are provided to improve luminous efficiency by including a charge generation layer between a cathode and a second electron transport layer. CONSTITUTION: A first hole transport layer(23) includes a first hole transport material and a first P-dopant. A first electron transport layer(24) includes the first electron transport material and an n-type dopant. A second electron transport layer(25) is formed on the first electron transport layer and includes a second electron transport material. A third hole transport layer(28) includes the third hole transport material and the second P-dopant. An anode(29) is formed on the third hole transport layer. The difference between an absolute value of an LUMO(Lowest Unoccupied Molecular Orbit) of the second electron transport layer and the absolute value of the LUMO of the first electron transport layer is 0 to 0.5eV.