| 摘要 |
An organic light emitting device comprises an anode, a cathode and a complex emitting layer. The complex emitting layer comprises a host and a guest. The host has a first energy level of a valence band and is used for a hole-injection layer or hole-transport layer. The guest has a second energy level of a conduction band and is used for doping the guest. The difference between the first and second energy levels is less than 2.5 eV.
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