Light-emitting device

Details Light-emitting device Light-emitting device

2008-10-15

2011-10-18

Santiago, Mariceli (Department: 2879)

Electric lamp and discharge devices

With luminescent solid or liquid material

Solid-state type

C313S503000, C313S506000, C428S690000

Reexamination Certificate

active

08040047

ABSTRACT:
To provide a long lifetime light-emitting element, in particular, to provide a long lifetime white light-emitting element, and to provide a light-emitting element having high luminous efficiency, in particular, to provide a white light-emitting element having high luminous efficiency. In a light-emitting element having, between an anode and a cathode, a first light-emitting layer containing a first light-emitting substance and a second light-emitting layer containing a second light-emitting substance which is provided to be in contact with the first light-emitting layer, the first light-emitting layer is divided into a layer provided on the anode side and a layer provided on the cathode side. At this time, a host material having a hole-transporting property is used for the layer provided on the anode side, and a host material having an electron-transporting property is used for the layer provided on the cathode side.

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