Electroluminescent device including a gallium complex
AssigneeEastman Kodak Company
InventorsTommie Royster, Denis Kondakov
Life of this patent
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Abstract
An OLED device comprises a cathode and anode and having therebetween a light-emitting layer, wherein there is located between the cathode and the light-emitting layer a further layer, not contiguous to the light-emitting layer, containing a metal complex of 3 bidentate ligands having Formula (1): wherein: each Za and each Zb is independently selected and each represents the atoms necessary to complete an unsaturated ring; Za and Zb are directly bonded to one another provided Za and Zb may be further linked together to form a fused ring system; and wherein the further layer also comprises an alkali metal material. Materials of the invention provide offer good luminance and reduced drive voltage.
Claims20
An OLED device comprising a cathode and anode and having therebetween a light-emitting layer, wherein there is located between the cathode and the light-emitting layer a further layer, not contiguous to the light-emitting layer, containing a gallium complex of 3 bidentate ligands having Formula (1):
- wherein:
- each Za and each Zb is independently selected and each represents the atoms necessary to complete an unsaturated ring;
- Za and Zb are directly bonded to one another provided Za and Zb may be further linked together to form a fused ring system;
- and
- wherein the further layer also comprises an alkali metal material.
The device of claim I wherein the molar ratio of the metal complex to the alkali metal material is about 1:1.
The device of claim I wherein each Za and each Zb represents the atoms necessary to form an independently selected aromatic ring group.
The device of claim I wherein at least one Za represents the atoms necessary to complete a six-membered aromatic ring.
The device of claim I wherein at least one Zb comprises an imidazole ring group.
The device of claim I wherein the gallium complex is represented by Formula (2):
- wherein:
- each Z1 through Z7 independently represents N or C-Y;
- and
- each Y represents hydrogen or an independently selected substituent, provided that two Y substituents may join to form a ring group.
An OLED device comprising a cathode, an anode and having therebetween a light-emitting layer, wherein there is located between the cathode and the light-emitting layer a further layer, not contiguous to the light-emitting layer, obtained by co-evaporating an alkali metal and a GaL3 complex having Formula (1):
- wherein:
- each Za and each Zb is independently selected and each represents the atoms necessary to complete an unsaturated ring;
- and
- each Za and Zb set are directly bonded to one another provided Za and Zb may be further linked together to form a fused ring system.
Dependencies are inferred from the claim text.