Novel red color emitting compounds and organic electroluminescent device using them

1 . A compound represented by formula (I):

wherein

R 1 is independently selected from the group consisting of hydrogen atom and substituted or unsubstituted C 1-6 alkyl;

X represents N, S, or O; and

Y represents hydrogen atom, substituted or unsubstituted C 1-6 alkyl, or substituted or unsubstituted C 1-6 alkoxy.

2 . The compound according to claim 1 , wherein R 1 is methyl.

3 . The compound according to claim 1 , wherein X is S.

4 . The compound according to claim 1 , wherein Y is methyl.

5 . The compound according to claim 1 , wherein R 1 is methyl, X is S, and Y is hydrogen or methyl.

6 . The compound according to claim 1 , wherein the compound is a red color emitting material.

7 . An organic electroluminescent device, comprising:

a first electrode;

a second electrode opposing said first electrode; and

at least one organic layer located between the first electrode and the second electrode, the organic layer comprising at least one compound according to formula (I):

wherein

R 1 is independently selected from the group consisting of hydrogen atom and substituted or unsubstituted C 1-6 alkyl;

X represents N, S, or O; and

Y represents hydrogen atom, substituted or unsubstituted C 1-6 alkyl, or substituted or unsubstituted C 1-6 alkoxy.

8 . The organic electroluminescent device according to claim 7 , wherein the organic layer comprises a light-emitting layer.

9 . The organic electroluminescent device according to claim 7 , wherein the organic layer is located between an anode that injects holes and a cathode that injects electrons.

10 . The organic electroluminescent device according to claim 7 , wherein one or more compound represented by formula (I) is used as a dopant and/or a host material.

11 . The organic electroluminescent device according to claim 5 , wherein the organic electroluminescent device comprises a substrate, an anode over the substrate, a hole injection layer over the anode, a hole transportation layer over the hole injection layer, an emitting layer over the transportation layer, an electron transporting layer over the emitting layer and a cathode over the electron transporting layer; and the compound of formula (I) is contained in at least the emitting layer.

12 . The organic electroluminescent device according to claim 5 , wherein in the compound of formula (I), R 1 is methyl.

13 . The organic electroluminescent device according to claim 5 , wherein in the compound of formula (I), X is S.

14 . The organic electroluminescent device according to claim 5 , wherein in the compound of formula (I), Y is methyl.

15 . The organic electroluminescent device according to claim 5 , wherein in the compound of formula (I), R 1 is methyl, X is S, and Y is hydrogen or methyl.

16 . The organic electroluminescent device according to claim 5 , wherein the compound of formula (I) is a red color emitting material.

17 . A method of manufacturing an organic electroluminescent device, comprising:

(a) providing a substrate;

(b) forming a first electrode;

(c) forming at least one layer on said first electrode, the layer comprising a compound of formula (I):

wherein

R 1 is independently selected from the group consisting of hydrogen atom and substituted or unsubstituted C 1-6 alkyl;

X represents N, S, or O; and

Y represents hydrogen atom, substituted or unsubstituted C 1-6 alkyl, or substituted or unsubstituted C 1-6 alkoxy; and

(d) forming a second electrode on the layer comprising the compound of formula (I).

18 . The method of manufacturing an organic electroluminescent device according to claim 17 , wherein in the compound of formula (I), R 1 is methyl.

19 . The method of manufacturing an organic electroluminescent device according to claim 17 , wherein in the compound of formula (I), X is S.

20 . The method of manufacturing an organic electroluminescent device according to claim 17 , wherein in the compound of formula (I), Y is methyl.