Organic electroluminescent element, illuminator and display

1. An organic electroluminescent element comprising an anode and a cathode having therebetween a light emitting layer containing a phosphorescent compound, and a hole blocking layer provided adjacent to the light emitting layer and between the light emitting layer and the cathode, wherein

the hole blocking layer contains a phosphorescent compound; and

a content of the phosphorescent compound contained in the hole blocking layer, in percent by weight, is in the range of 0.1 to 20% of a content, in % by weight, of the phosphorescent compound contained in the light emitting layer.

2. The organic electroluminescent element of claim 1 , wherein the organic electroluminescent element further comprises a second hole blocking layer provided adjacent to the hole blocking layer and between the hole blocking layer and the cathode.

3. The organic electroluminescent element of claim 1 , wherein the phosphorescent compound contained in the light emitting layer is the same as the phosphorescent compound contained in the hole blocking layer.

4. The organic electroluminescent element of claim 1 , wherein the phosphorescent compound contained in the light emitting layer is different from the phosphorescent compound contained in the hole blocking layer.

5. An organic electroluminescent element comprising an anode and a cathode having therebetween a light emitting layer containing a phosphorescent compound, and an electron blocking layer provided adjacent to the light emitting layer and between the light emitting layer and the anode, wherein

the electron blocking layer contains a phosphorescent compound; and

a content, in % by weight, of the phosphorescent compound contained in the electron blocking layer is in the range of 0.1 to 20% of the content, in % by weight, of the phosphorescent compound contained in the light emitting layer.

6. The organic electroluminescent element of claim 5 , wherein the organic electroluminescent element further comprises a second electron blocking layer provided adjacent to the electron blocking layer and between the electron blocking layer and the anode.

7. The organic electroluminescent element of claim 5 , wherein the phosphorescent compound contained in the light emitting layer is the same as the phosphorescent compound contained in the electron blocking layer.

8. The organic electroluminescent element of claim 5 , wherein the phosphorescent compound contained in the light emitting layer is different from the phosphorescent compound contained in the electron blocking layer.

9. An organic electroluminescent element comprising an anode and a cathode having therebetween a light emitting layer containing a phosphorescent compound; a hole blocking layer provided adjacent to the light emitting layer and between the light emitting layer and the cathode; and an electron blocking layer provided adjacent to the light emitting layer and between the light emitting layer and the anode, wherein

the hole blocking layer contains a phosphorescent compound;

a content in % by weight of the phosphorescent compound contained in the hole blocking layer is in the range of 0.1 to 20% of the content, in % by weight, of the phosphorescent compound contained in the light emitting layer;

the electron blocking layer contains a phosphorescent compound; and

the content, in % by weight; of the phosphorescent compound contained in the electron blocking layer is in the range of 0.1 to 20% of the content, in % by weight, of the phosphorescent compound contained in the light emitting layer.

10. The organic electroluminescent element of claim 9 , wherein the organic electroluminescent element further comprises a hole blocking layer provided adjacent to the hole blocking layer and between the hole blocking layer and the cathode.

11. The organic electroluminescent element of claim 9 , wherein the organic electroluminescent element further comprises a second electron blocking layer provided adjacent to electron blocking layer and between the electron blocking layer and the anode.

12. The organic electroluminescent element of claim 9 , wherein the phosphorescent compound contained in the light emitting layer is the same as the phosphorescent compound contained in the hole blocking layer.

13. The organic electroluminescent element of claim 9 , wherein the phosphorescent compound contained in the light emitting layer is different from the phosphorescent compound contained in the hole blocking layer.

14. The organic electroluminescent element of claim 9 , wherein the phosphorescent compound contained in the light emitting layer is the same as the phosphorescent compound contained in the electron blocking layer.

15. The organic electroluminescent element of claim 9 , wherein the phosphorescent compound contained in the light emitting layer is different from the phosphorescent compound contained in the electron blocking layer.

16. The organic electroluminescent element of claim 1 emitting white light.

17. A display comprising the organic electroluminescent element of claim 1 .

18. An illumination device comprising the organic electroluminescent element of claim 1 .

19. A display comprising a liquid crystal cell and the illumination device of claim 18 .

20. The organic electroluminescent element of claim 5 emitting white light.

21. A display comprising the organic electroluminescent element of claim 5 .

22. An illumination device comprising the organic electroluminescent element of claim 5 .

23. A display comprising a liquid crystal cell and the illumination device of claim 22 .

24. The organic electroluminescent element of claim 9 emitting white light.

25. A display comprising the organic electroluminescent element of claim 9 .

26. An illumination device comprising the organic electroluminescent element of claim 9 .

27. A display comprising a liquid crystal cell and the illumination device of claim 26 .