Organic electroluminescence device

1. An organic electroluminescence device comprising an anode; a hole transport layer comprising an organic compound; a light emitting layer having an organic compound; an electron transport layer having an organic compound: and a cathode which are stacked, characterized in that the light emitting layer includes an organic host material represented by the following structural formula (1):

and a phosphorescent organic guest material.

2. An organic electroluminescence device according to claim 1 , wherein a hole injection layer is provided between the anode and the hole transport layer.

3. An organic electroluminescence device according to claim 1 or claim 2 , wherein an electron injection layer is provided between the cathode and the electron transport layer.

4. An organic electroluminescence device according to claim 1 , wherein the phosphorescent organic guest material comprises a porphyrin compound represented by the following structural formula (2):

in the structural formula (2), Q represents —N═ or —C(R)═; M represents a metal, a metal oxide, or a metal halide, R represents hydrogen, alkyl, aralkyl, aryl or alkaryl, or a halogenated substituent thereof, T 1 and T 2 each represents hydrogen or alkyl, or jointly represent a completed unsaturated six-membered ring including a halogen substituent, the six-membered ring is formed of carbon, sulfur and nitrogen ring atoms, and the alkyl moiety contains 1 to 6 carbon atoms.

5. An organic electroluminescence device according to claim 4 , wherein M in the phosphorescent organic guest material is platinum.

6. An organic electroluminescence device according to claim 1 , wherein the phosphorescent organic guest material comprises a compound represented by the following structural formula (3):

in the structural formula (3), M represents iridium, R 1 to R 8 each independently includes a hydrogen atom, alkyl group, oxy group, amino group or a hydrocarbon group having at least one carbon atom in the substituent, the number of carbon atoms is 1 to 10 in each of the hydrocarbon moieties, further, R 1 to R 8 can be selected independently from cyano, halogen, and α-haloalkyl, α-haloalkoxy, amide, sulfonyl, carbonyl, carbonyloxy and oxycarbonyl substituents containing 10 or less carbon atoms, and further, R 1 together with R 2 , R 2 together with R 3 , R 3 together with R 4 , R 4 together with R 5 , R 5 together with R 6 , R 6 together with R 7 , or R 7 together with R 8 can form a condensed benzo ring.

7. An organic electroluminescence device according to claim 1 , wherein the phosphorescent organic guest material comprises a compound represented by the following structural formula (4):

in the structural formula (4), M represents a metal, R 1 to R 6 each independently includes a hydrogen atom, alkyl group, oxy group, amino group or a hydrocarbon group having at least one carbon atom in the substituent, the number of carbon atoms is 1 to 10 in each of the hydrocarbon moieties, further, R 1 to R 6 can be selected independently from cyano, halogen, and α-haloalkyl, α-haloalkoxy, amide, sulfonyl, carbonyl, carbonyloxy and oxycarbonyl substituents containing 10 or less carbon atoms and, further, R 1 together with R 2 , R 3 together with R 4 , R 4 together with R 5 , or R 5 together with R 6 can form a condensed benzo ring.

8. An organic electroluminescence device according to claim 7 , wherein M in the phosphorescent organic guest material is iridium.

9. An organic electroluminescence device according to claim 1 , wherein the phosphorescent organic guest material comprises a compound represented by the following structural formula (5):

in the structural formula (5), M represents iridium, X 1 and X 2 each independently represents an oxygen atom or a sulfur atom, R 1 to R 11 each independently includes a hydrogen atom, alkyl group, oxy group, amino group, or a hydrocarbon group having at least one carbon atom in the substituent, the number of carbon atoms is 1 to 10 in each of the hydrocarbon moieties, further, R 1 to R 11 can be selected independently from cyano, halogen, and α-haloalkyl, α-haloalkoxy, amide, sulfonyl, carbonyl, carbonyloxy and oxycarbonyl substituents containing 10 or less carbon atoms and, further, R 1 together with R 2 , R 2 together with R 3 , R 3 together with R 4 , R 4 together with R 5 , R 5 together with R 6 , R 6 together with R 7 , or R 7 together with R 8 can form a condensed benzo ring.

10. An organic electroluminescence device according to claim 1 , wherein the phosphorescent organic guest material comprises a compound represented by the following structural formula (6):

in the structural formula (6), M represents iridium, X 1 and X 2 each independently represents an oxygen atom or a sulfur atom, R 1 to R 9 each independently includes a hydrogen atom, alkyl group, oxy group, amino group or a hydrocarbon group having at least one carbon atom in the substituent, the number of carbon atoms is 1 to 10 in each of the hydrocarbon moieties, further, R 1 to R 9 can be selected independently from cyano, halogen, and α-haloalkyl, α-haloalkoxy, amide, sulfonyl, carbonyl, carbonyloxy and oxycarbonyl substituents containing 10 or less of carbon atoms and, further, R 1 together with R 2 , R 3 together with R 4 , R 4 together with R 5 , R 5 together with R 6 , R 7 together with R 8 , or R 8 together with R 9 can form a condensed benzo ring.