Organic electroluminescence device including multi-layered protective layer

1. An organic electroluminescence device, comprising:

an organic electroluminescence element; and

a protective layer configured to protect the organic electroluminescence element, wherein

the protective layer includes a first insulating film, a second insulating film, a third insulating film, a fourth insulating film, and a fifth insulating film,

the first insulating film, the second insulating film, the third insulating film, the fourth insulating film, and the fifth insulating film are disposed in this order in a direction away from the organic electroluminescence element,

each of the first insulating film, the second insulating film, the third insulating film, the fourth insulating film, and the fifth insulating film includes an inorganic material, and

a density of the first insulating film is lower than a density of the third insulating film and a density of the fifth insulating film.

2. The organic electroluminescence device according to claim 1 , wherein

a density of the second insulating film is higher than the density of the first insulating film, the density of the third insulating film, and the density of the fifth insulating film, and

a density of the fourth insulating film is higher than the density of the first insulating film, the density of the third insulating film, and the density of the fifth insulating film.

3. The organic electroluminescence device according to claim 1 , wherein

main materials included respectively in the first insulating film, the second insulating film, the third insulating film, the fourth insulating film, and the fifth insulating film are identical to each other.

4. The organic electroluminescence device according to claim 1 , wherein

a thickness of the first insulating film is greater than a thickness of each of the third insulating film and the fifth insulating film.

5. The organic electroluminescence device according to claim 4 , wherein

a thickness of the second insulating film is smaller than the thickness of each of the first insulating film, the third insulating film, and the fifth insulating film, and

a thickness of the fourth insulating film is smaller than the thickness of each of the first insulating film, the third insulating film, and the fifth insulating film.

6. The organic electroluminescence device according to claim 5 , wherein

a main material included in each of the second insulating film and the fourth insulating film is silicon oxide, silicon nitride, silicon oxynitride, or aluminum oxide.

7. The organic electroluminescence device according to claim 6 , wherein

a main material included in each of the first insulating film, the third insulating film, and the fifth insulating film is silicon nitride or silicon oxynitride.

8. The organic electroluminescence device according to claim 2 , wherein

the density of the third insulating film is equal to or less than the density of the fifth insulating film.

9. The organic electroluminescence device according to claim 8 , wherein

a thickness of the third insulating film is equal to or less than a thickness of the fifth insulating film.

10. An electronic apparatus, comprising:

the organic electroluminescence device according to claim 1 ; and

a control unit configured to control operation of the organic electroluminescence device.

11. An organic electroluminescence device, comprising:

a substrate;

a light emitting layer; and

a protective layer disposed on an opposite side of the light emitting layer from the substrate, and configured to protect the light emitting layer, wherein

the protective layer includes

a fifth insulating film,

a fourth insulating film disposed between the light emitting layer and the fifth insulating film, and having a density higher than a density of the fifth insulating film,

a third insulating film disposed between the light emitting layer and the fourth insulating film, and having a density lower than a density of the fourth insulating film,

a second insulating film disposed between the light emitting layer and the third insulating film, and having a density higher than a density of each of the third insulating film and the fifth insulating film, and

a first insulating film disposed between the light emitting layer and the second insulating film, and having a density lower than a density of each of the third insulating film and the fifth insulating film.

12. The organic electroluminescence device according to claim 11 , wherein

a thickness of the first insulating film is greater than a thickness of each of the third insulating film and the fifth insulating film.

13. The organic electroluminescence device according to claim 12 , wherein

a thickness of the second insulating film is smaller than the thickness of each of the third insulating film and the fifth insulating film, and

a thickness of the fourth insulating film is smaller than the thickness of each of the third insulating film and the fifth insulating film.

14. The organic electroluminescence device according to claim 13 , wherein

main materials included respectively in the first insulating film, the second insulating film, the third insulating film, the fourth insulating film, and the fifth insulating film are identical to each other.

15. The organic electroluminescence device according to claim 14 , wherein

a density of the third insulating film is equal to or less than a density of the fifth insulating film.

16. The organic electroluminescence device according to claim 15 , wherein

a thickness of the third insulating film is equal to or less than a thickness of the fifth insulating film.