Light emitting element and light emitting device

Details Light emitting element and light emitting device Light emitting element and light emitting device

2011-05-17

2011-05-17

Jackson, Jr., Jerome (Department: 2815)

Active solid-state devices (e.g., transistors, solid-state diode

Organic semiconductor material

C257S103000, C257SE51022, C257SE51044, C313S504000, C428S690000

Reexamination Certificate

active

07943925

ABSTRACT:
A high efficient white emission light emitting element having peak intensity in each wavelength region of red, green, and blue is provided. Specifically, a white emission light emitting element having an emission spectrum that is independent of current density is provided. A first light emitting layer312exhibiting blue emission and a second light emitting layer313containing a phosphorescent material that generates simultaneously phosphorescent emission and excimer emission are combined. In order to derive excimer emission from the phosphorescent material, it is effective to disperse a phosphorescent material323having a high planarity structure such as platinum complex at a high concentration of at least 10 wt % to a host material322. Further, the first light emitting layer312is provided to be in contact with the second light emitting layer313at the side of an anode. Ionization potential of the second light emitting layer313is preferably larger by 0.4 eV than that of the first light emitting layer312.

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