Organic light-emitting transistor and display device

1. An organic light-emitting transistor having a source electrode layer; a drain electrode layer facing said source electrode layer; an organic light-emitting layer formed between said source electrode layer and said drain electrode layer; a semiconductor layer formed between said organic light-emitting layer and said source electrode layer; and a gate electrode layer deposited to face through a gate insulation film to one face of said source electrode layer opposite to the other face facing said drain electrode layer, said organic light-emitting transistor further comprising:

a charge-carrier suppression layer formed between said organic light-emitting layer and said source electrode layer to have an aperture; and

a relay region formed between said charge-carrier suppression layer and said source electrode layer to relay charge-carriers from said source electrode layer to said aperture.

2. The organic light-emitting transistor according to claim 1 , wherein said source electrode layer has an aperture and wherein a portion of said charge-carrier suppression layer defining said aperture is formed to cover an edge defining said aperture of said source electrode layer.

3. The organic light-emitting transistor according to claim 1 , wherein said aperture of said charge-carrier suppression layer is formed to confine a flow of charge-carriers supplied from said source electrode layer.

4. The organic light-emitting transistor according to claim 1 , wherein an area of said charge-carrier suppression layer occupying in said organic light-emitting transistor is equal to or larger than that of said source electrode layer.

5. The organic light-emitting transistor according to claim 1 , wherein said charge-carrier suppression layer is made of an insulating material or of a semiconductor material having a reversed polarity against said semiconductor layer.

6. The organic light-emitting transistor according to claim 1 , wherein said charge-carrier suppression layer has a thickness equal to or thicker than that of said source electrode layer.

7. The organic light-emitting transistor according to claim 1 , wherein said semiconductor layer is made of an organic semiconductor material or inorganic oxide semiconductor material.

8. The organic light-emitting transistor according to claim 1 , further comprising at least one carrier transport layer deposited between said semiconductor layer and said organic light-emitting layer.

9. The organic light-emitting transistor according to claim 1 , further comprising a carrier injection layer or at least one carrier transport layer or both thereof deposited between said drain electrode layer and said organic light-emitting layer.

10. The organic light-emitting transistor according to claim 1 , further comprising an additional insulation film made of an insulating material covering said charge-carrier suppression layer only at a side of said source electrode layer.

11. The organic light-emitting transistor according to claim 1 , wherein said semiconductor layer is made of a p-type semiconductor material or n-type semiconductor material.

12. The organic light-emitting transistor according to claim 1 , wherein said gate electrode layer or drain electrode layer or both thereof is made of a material having a transmissivity higher than 10% or more in the wavelength of emission from the material of said organic light-emitting layer.

13. A display device in which a plurality of light-emitting sections are disposed in a matrix shape, each light-emitting section being said organic light-emitting transistor according to claim 1 , the display device comprising at least one switching element electrically connected to said gate electrode layer per said organic light-emitting transistor.

14. The display device according to claim 13 , further comprises a wiring that supplies electrical power to said source electrode layer or said drain electrode layer of said organic light-emitting transistor and a wiring for applying ON/OFF voltage information to said gate electrode layer.

15. The display device according to claim 13 , further comprises a first voltage applying means for applying a constant voltage between said source electrode layer and said drain electrode layer and a second voltage applying means for applying a variable voltage between said source electrode layer and said gate electrode layer.

16. The display device according to claim 13 , wherein said switching element has an insulation film made of the same material as that of said gate insulation film.

17. The display device according to claim 16 , wherein said insulation film of said the switching element and said gate insulation film are fabricated simultaneously.

18. The display device according to claim 13 , wherein said switching element has an insulation film made of the same material as that of said charge-carrier suppression layer.

19. The display device according to claim 18 , wherein said insulation film of said the switching element and said charge-carrier suppression layer are fabricated simultaneously.

20. The display device according to claim 13 , wherein said switching element has a semiconductor layer made of the same material as that of said semiconductor layer of said organic light-emitting transistor.

21. The display device according to claim 20 , wherein said semiconductor layer of said the switching element and said semiconductor layer of said organic light-emitting transistor are fabricated simultaneously.