Organic light-emitting device

1. An organic light-emitting device, comprising:

a first electrode;

a second electrode;

an emission layer between the first electrode and the second electrode;

a mixed organic layer between the emission layer and the first electrode, the mixed organic layer comprising: a fluorene derivative selected from Compound 5, Compound 6 and one of Formulas 2-9; and a pyrazine derivative represented by Formula 16:

R, R 1 , R 2 , R 3 and R 4 in Formulas 1-9 being each independently one of a hydrogen atom, a substituted or unsubstituted C 1-30 alkyl group, a substituted or unsubstituted C 1-30 alkenyl group, a substituted or unsubstituted C 1-30 alkoxy group, a substituted or unsubstituted C 6-30 aryl group, a substituted or unsubstituted C 6-30 aryloxy group, a substituted or unsubstituted C 2-30 heteroaryl group, a substituted or unsubstituted C 5-30 condensed polycyclic group, a hydroxyl group, a cyano group and a substituted or unsubstituted amino group,

each R in Formula 16 being independently a hydrogen atom, a C 1 -C 10 alkyl group, an alkyloxy group, dialkyl amine, halogen, or cyano; and

an electron transport layer between the emission layer and the second electrode, the electron transport layer comprising a lithium quinolate and a pyridine derivative.

2. The organic light-emitting device of claim 1 , the fluorene derivative being selected from the group consisting of Compounds 1 through 4 represented by Formulae 10 through 13, respectively:

3. The organic light-emitting device of claim 1 , the pyrazine derivative represented by Formula 16 comprising a compound represented by Formula 17:

4. The organic light-emitting device of claim 1 , the amount of the pyrazine derivative represented by Formula 16 being in the range of about 0.1 to about 99.9 parts by weight based on 100 parts by weight of the mixed organic layer.

5. The organic light-emitting device of claim 1 , the thickness of the mixed organic layer being in the range of about 1 to about 210 nm.

6. The organic light-emitting device of claim 1 , the pyridine derivative comprising a compound represented by Formula 32:

L being a direct linkage or a bivalent linking group, and being selected from the group consisting of methylene, vinylene, phenylene, anthrylene, thienylene, fluorenylene, spirobifluorenylene, indenofluorenylene, pyridylene, carbazolylene, indenocarbazolylene, benzothiazolylene, oxadiazolylene, pyrylene, furylene, and the above-described groups substituted with one or more substituents selected from the group consisting of alkyl, alkoxy, alkenyl, alkynyl, alkylthio, alkylamino, arylamino, heteroarylamino, aryloxy, heteroaryloxy, arylthio, heteroarylthio, halogen, and cyano,

R 31 to R 38 are, each independently, a group selected from group consisting of the following structures:

and

n is an integer of 2 to 6.

7. The organic light-emitting device of claim 1 , the pyridine derivative represented by Formula 32 comprising a compound represented by Formula 33:

8. The organic light-emitting device of claim 1 , a weight ratio of the lithium quinolate to the pyridine derivative represented by Formula 32 being in the range of 1:9 to 9:1.

9. The organic light-emitting device of claim 1 , further comprising a hole transport layer interposed between the mixed organic layer and the emission layer or between the first electrode and the mixed organic layer, and the hole transport layer comprises a carbazole moiety-containing triaryl amine derivative.

10. The organic light-emitting device of claim 9 , the thickness of the hole transport layer being in a range of about 3 to about 180 nm.

11. The organic light-emitting device of claim 1 , further comprising a hole injection layer between the mixed organic layer and the emission layer or between the first electrode and the mixed organic layer, and the hole injection layer comprises a compound selected from the group consisting of a phthalocyanine compound, an amine derivative, poly(3,4-ethylenedioxythiophene)/poly(4-styrenesulfonate) (PEDOT/PSS), polyaniline/camphor sulfonic acid (Pani/CSA), and (polyaniline)/poly(4-styrenesulfonate) (PANI/PSS).

12. The organic light-emitting device of claim 1 , further comprising a hole injection layer between the first electrode and the emission layer and a hole transport layer between the hole injection layer and the emission layer, the mixed organic layer being positioned between the first electrode and the hole injection layer, between the hole transport layer and the emission layer, or formed inside the hole transport layer.

13. The organic light-emitting device of claim 1 , the emission layer comprising one of an anthracene-based compound and a styryl-based compound.

14. The organic light-emitting device of claim 1 , further comprising an electron injection layer comprising lithium quinolate or lithium fluoride between the electron transport layer and the second electrode.

15. An organic light-emitting device, comprising:

a first electrode;

a second electrode;

an emission layer between the first electrode and the second electrode;

a mixed organic layer between the emission layer and the second electrode, the mixed organic layer comprising a fluorene derivative and a pyrazine derivative, the fluorene derivative selected from compounds represented by Formulas 2 to 9 and the pyrazine derivative represented by Formula 16:

R, R 1 , R 2 , R 3 and R 4 in Formulae 2 through 9 being each independently selected from a hydrogen atom, a substituted or unsubstituted C1-30 alkyl group, a substituted or unsubstituted C1-30 alkenyl group, a substituted or unsubstituted C1-C30 alkoxy group, a substituted or unsubstituted C6-C30 aryl group, a substituted or unsubstituted C6-C30 aryloxy group, a substituted or unsubstituted C2-C30 heteroaryl, or a substituted or unsubstituted C5-C30 condensed polycyclic group, a hydroxyl group, a cyano group, and a substituted or unsubstituted amino group; and

each R in Formula 16 being independently a hydrogen atom, a C1-C10 alkyl group, an alkyloxy group, dialkyl amine, halogen, or cyano; and

an electron transport layer between the emission layer and the second electrode, the electron transport layer comprising a lithium quinolate and a pyridine derivative represented by Formula 32:

L being a direct linkage or a bivalent linking group, and being selected from the group consisting of methylene, vinylene, phenylene, anthrylene, thienylene, fluorenylene, spirobifluorenylene, indenofluorenylene, pyridylene, carbazolylene, indenocarbazolylene, benzothiazolylene, oxadiazolylene, pyrylene, furylene, and the above-described groups substituted with one or more substituents selected from the group consisting of alkyl, alkoxy, alkenyl, alkynyl, alkylthio, alkylamino, arylamino, heteroarylamino, aryloxy, heteroaryloxy, arylthio, heteroarylthio, halogen, and cyano,

R 31 to R 38 are, each independently, a group selected from group consisting of the following structures:

and

n is an integer of 2 to 6.

16. An organic light-emitting device, comprising:

a first electrode;

a second electrode;

an emission layer between the first electrode and the second electrode;

a hole-related layer comprising a hole injection layer between the first electrode and the emission layer, a hole transport layer between the hole injection layer and the emission layer, and a mixed organic layer positioned between the first electrode and the hole injection layer, between the hole transport layer and the emission layer, or inside the hole transport layer, the mixed organic layer comprising a fluorene derivative and a pyrazine derivative, the fluorene derivative selected from compounds represented by Formulas 2 to 9 and the pyrazine derivative represented by Formula 16:

R, R 1 , R 2 , R 3 and R 4 in Formulae 2 through 9 being each independently selected from a hydrogen atom, a substituted or unsubstituted C1-30 alkyl group, a substituted or unsubstituted C1-30 alkenyl group, a substituted or unsubstituted C1-C30 alkoxy group, a substituted or unsubstituted C6-C30 aryl group, a substituted or unsubstituted C6-C30 aryloxy group, a substituted or unsubstituted C2-C30 heteroaryl, or a substituted or unsubstituted C5-C30 condensed polycyclic group, a hydroxyl group, a cyano group, and a substituted or unsubstituted amino group; and

each R in Formula 16 being independently a hydrogen atom, a C1-C10 alkyl group, an alkyloxy group, dialkyl amine, halogen, or cyano; and

an electron transport layer between the emission layer and the second electrode, the electron transport layer comprising a lithium quinolate and a pyridine derivative represented by Formula 32:

L being one of a direct linkage and a bivalent linking group, and being selected from the group consisting of methylene, vinylene, phenylene, anthrylene, thienylene, fluorenylene, spirobifluorenylene, indenofluorenylene, pyridylene, carbazolylene, indenocarbazolylene, benzothiazolylene, oxadiazolylene, pyrylene, furylene, and the above-described groups substituted with one or more substituents selected from the group consisting of alkyl, alkoxy, alkenyl, alkynyl, alkylthio, alkylamino, arylamino, heteroarylamino, aryloxy, heteroaryloxy, arylthio, heteroarylthio, halogen, and cyano,

R 31 to R 38 are, each independently, a group selected from group consisting of the following structures:

and

n is an integer of 2 to 6.

17. The organic light-emitting device of claim 16 , further comprising an electron injection layer comprising lithium quinolate or lithium fluoride between the electron transport layer and the second electrode.

18. An organic light-emitting device, comprising:

a first electrode;

a second electrode;

an emission layer between the first electrode and the second electrode;

a mixed organic layer between the emission layer and the first electrode, the mixed organic layer comprising Compound 6 and a compound represented by Formula 17; and

an electron transport layer between the emission layer and the second electrode, the electron transport layer comprising a lithium quinolate and Compound 21:

19. The organic light-emitting device of claim 1 , the fluorene derivative being described by Formula 4 below:

R, R 1 , R 2 and R 3 being each independently one of a hydrogen atom, a substituted or unsubstituted C1-C30 alkyl group, a substituted or unsubstituted C1-C30 alkenyl group, a substituted or unsubstituted C 1 -C 30 alkoxy group, a substituted or unsubstituted C 6 -C 30 aryl group, a substituted or unsubstituted C 6 -C 30 aryloxy group, a substituted or unsubstituted C 2 -C 30 heteroaryl, or a substituted or unsubstituted C 5 -C 30 condensed polycyclic group, a hydroxyl group, a cyano group and a substituted or unsubstituted amino group.