Composition for electron transport layer, electron transport layer manufactured thereof, and organic electroluminescent deivce including the electron transport layer
AssigneeSamsung Mobile Display Co., Ltd.
InventorsJong-Jin Park, Tae-Yong Noh, Jae-Hwan Kim
Life of this patent
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Abstract
Provided are a composition for an electron transport layer which can be wet coated at a low temperature, an electron transport layer manufactured by coating and drying the composition, and an organic electroluminescent device including the electron transport layer. The organic electroluminescent device including the electron transport layer manufactured by wet coating the composition for an electron transport layer has an improved electron injection into a light emitting layer, thereby having an excellent light emitting efficiency, low operating voltage, and improved lifespan.
Claims20
A composition for forming an electron transport layer, comprising:
- Al2O3;
- a soluble titanium precursor;
- and
- a solvent.
An organic electroluminescent device, comprising:
- a first electrode;
- a second electrode;
- a light emitting layer interposed between the first electrode and the second electrode;
- and
- an electron transport layer interposed between the second electrode and the light emitting layer, the electron transport layer formed from a composition comprising:
- Al2O3;
- a soluble titanium precursor selected from the group consisting of compounds represented by formulas 1 through 4:
- Ti(OR)4 (1)
- where R is each independently CH3CO—CH═C(CH3)—, C2H5OCO—CH═C(CH3)—, —(CH3)CH—COO−NH4+, —COR′, —CO(C6H4)COOR″, or a C1-C10 alkyl group where R′ is a substituted or unsubstituted C1-C10 alkyl group, and R″ is a substituted or unsubstituted C1-C10 alkyl group;
- where R is a substituted or unsubstituted C1-C10 alkyl group, and R′ is a substituted or unsubstituted C1-C10 alkyl group;
- where R is a substituted or unsubstituted C1-C10 alkyl group;
- where R1 is a substituted or unsubstituted C1-C10 alkyl group;
- and
- a solvent.
An organic electroluminescent device, comprising:
- a substrate;
- an anode formed on the substrate;
- a hole transport layer formed on the anode;
- a light emitting layer formed on the hole transport layer;
- an electron transport layer formed on the light emitting layer, the electron transport layer formed by coating and drying a composition, the composition comprising:
- Al2O3;
- a soluble titanium precursor selected from the group consisting of compounds represented by formulas 1 through 4:
- Ti(OR)4 (1)
- where R is each independently CH3CO—CH═C(CH3)—, C2H5OCO—CH═C(CH3)—, —(CH3)CH—COO−NH4+, —COR′, —CO(C6H4)COOR″, or a C1-C10 alkyl group where R′ is a substituted or unsubstituted C1-C10 alkyl group, and R″ is a substituted or unsubstituted C1-C10 alkyl group;
- where R is a substituted or unsubstituted C1-C10 alkyl group, and R′ is a substituted or unsubstituted C1-C10 alkyl group;
- where R is a substituted or unsubstituted C1-C10 alkyl group;
- where R1 is a substituted or unsubstituted C1-C10 alkyl group;
- and
- a solvent;
- and
- a cathode formed on the electron transport layer.
Dependencies are inferred from the claim text.