| 摘要 |
PROBLEM TO BE SOLVED: To find out an efficient OLED (organic light-emitting device) structure capable of emitting light in a blue region of a visible electromagnetic spectrum. SOLUTION: Phosphorescent OLEDs have a double doped-layer structure, wherein the OLEDs includes: a hole transporting layer (HTL) having a phosphorescent material doped therein; and an electron transporting layer (ETL) having the same phosphorescent material doped therein. Typically, these phosphorescent OLEDs have an anode, a first HTL over the anode, a second HTL that is doped with a phosphorescent material over the first HTL, a first ETL that is doped with a phosphorescent material over the second HTL, a second ETL over the first ETL, and a cathode over the second ETL. These phosphorescent OLEDs preferably include blue phosphorescent OLEDs with high efficiency levels. COPYRIGHT: (C)2009,JPO&INPIT
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