Organic electroluminescent element and display device

1 . An organic electroluminescent element which comprises, on a substrate, at least an anode, an organic layer having a luminescent layer, an electron injecting layer and a cathode laminated in this order or in the reverse order, wherein an outer peripheral portion of the cathode is positioned inside an outer peripheral portion of the electron injecting layer.

2 . An organic electroluminescent element which includes, on a substrate, at least an anode, an organic layer having a luminescent layer, an electron injecting layer and a cathode laminated in this order or in the reverse order, wherein an outer peripheral portion of the cathode other than an area where a lead-out electrode is formed is positioned inside an outer peripheral portion of the electron injecting layer.

3 . An organic electroluminescent element according to claim 1 , wherein the cathode and the electron injecting layer are positioned such that the sum of the intervals, at both sides of the peripheral portions along a predetermined straight line between the outer peripheral portion of the cathode and the outer peripheral portion of the electron injecting layer, at points where the sum becomes shortest, is 20 μm or more.

4 . An organic electroluminescent element according to claim 1 , wherein the electron injecting layer has a planar shape and an area identical to those of the luminescent layer.

5 . An organic electroluminescent element according to claim 1 , wherein the electron injecting layer has an area smaller than that of the luminescent layer.

6 . An organic electroluminescent element according to claim 1 , wherein the electron injecting layer comprises alkali metal or an alkali metal compound.

7 . An organic electroluminescent element according to claim 6 , wherein the electron injecting layer comprises an alkali metal fluoride.

8 . An organic electroluminescent element according to claim 7 , wherein the electron injecting layer has a layer thickness of from 0.1 to 5 nm.

9 . An organic electroluminescent element according to claim 7 , wherein the cathode contains aluminum.

10 . An organic electroluminescent element according to claim 1 , wherein the organic layer comprises at least a hole-injecting layer, a hole transport layer, the luminescent layer and an electron transport layer.

11 . A method for producing an organic electroluminescent element, wherein the organic electroluminescent element comprises on a substrate, at least an anode, an organic layer having a luminescent layer, an electron injecting layer and a cathode laminated in this order or in the reverse order, wherein a mask for deposition used for forming the electron injecting layer has an opening area different from an opening area of a mask for deposition used for forming the cathode.

12 . A method for producing an organic electroluminescent element according to claim 11 , wherein the mask for deposition used for forming the electron injecting layer is different from a mask for deposition used for forming the organic layer including the luminescent layer.

13 . A method for producing an organic electroluminescent element according to claim 11 , wherein the electron injecting layer is formed by the use of the same mask as that for forming the organic layer including the luminescent layer.

14 . A display device comprising the organic electroluminescent element according to claim 1 .

15 . A display device comprising the organic electroluminescent element according to claim 2 .

16 . A display device comprising the organic electroluminescent element according to claim 3 .

17 . A display device comprising the organic electroluminescent element according to claim 4 .

18 . A display device comprising the organic electroluminescent element according to claim 5 .

19 . A display device comprising the organic electroluminescent element according to claim 6 .

20 . A display device comprising the organic electroluminescent element according to claim 7.