Laser oscillator

• US 8,867,585 B2
• Filed: 11/09/2011
• Issued: 10/21/2014
• Est. Priority Date: 09/12/2003
• Status: Expired due to Fees

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Nomura, Ryoji, Shimomura, Akihisa
• Primary Examiner(s): NGUYEN, TUAN N
• Application Number:
  US13/292,225
• Publication Number:
  US 20120051031A1
• Time in Patent Office: 1,077 Days
• Field of Search: 257/E27.119, 257/E51.018, 257/13, 372/9, 372/50.12, 313/506
• US Class Current: 372/92
• CPC Class Codes: H01S 5/02212 Can-type, e.g. TO-CAN housings with emission along or parallel to symmetry axis
• CPC Class Codes: H01S 5/02345 Wire-bonding
• CPC Class Codes: H01S 5/04256 characterised by the configuration
• CPC Class Codes: H01S 5/04257 having positive and negative electrodes on the same side of the substrate
• CPC Class Codes: H01S 5/1039 Details on the cavity length
• CPC Class Codes: H01S 5/18388 Lenses
• CPC Class Codes: H01S 5/36 comprising organic materials
• CPC Class Codes: H01S 5/423 having a vertical cavity

Abstract

The present invention provides a laser oscillator using an electroluminescent material that can enhance directivity of emitted laser light and resistance to a physical impact. The laser oscillator has a first layer including a concave portion, a second layer formed over the first layer to cover the concave portion, and a light emitting element formed over the second layer to overlap the concave portion, wherein the second layer is planarized, an axis of laser light obtained from the light emitting element intersects with a planarized surface of the second layer, the first layer has a curved surface in the concave portion, and a refractive index of the first layer is lower than that of the second layer.

Claims

1. A device comprising:

a first layer selected from a glass substrate, a quartz substrate, a plastic substrate, or a resin film;

a light emitting element over the first layer; and

a light-transmitting second layer covering the light emitting element, the light-transmitting second layer being selected from a glass substrate, a quartz substrate, or a plastic substrate,

wherein the light-transmitting second layer has a curved convex portion which overlaps with the light emitting element and a flat portion around the curved convex portion,

wherein the light emitting element comprises a first electrode and a second electrode with an electroluminescent layer sandwiched therebetween,

wherein the curved convex portion and the flat portion each overlap with the first electrode and the electroluminescent layer,

wherein the light-transmitting second layer is in direct contact with a top surface of the electroluminescent layer, and

wherein the second electrode is confined in a region which overlaps with the curved convex portion.

2. The device according to claim 1,

wherein the electroluminescent layer comprises:

a first organic electroluminescent layer;

a second organic electroluminescent layer over the first organic electroluminescent layer; and

a charge generation layer between the first and the second organic electroluminescent layers.

3. The device according to claim 2, wherein the charge generation layer comprises molybdenum oxide.

4. The device according to claim 1, wherein the device is a laser oscillator.

5. A display device comprising a backlight including the device according to claim 1.

6. A device comprising:

a first layer selected from a glass substrate, a quartz substrate, a plastic substrate, or a resin film;

a plurality of light emitting elements arranged in a matrix over the first layer; and

a light-transmitting second layer covering the plurality of light emitting elements, the light-transmitting second layer being selected from a glass substrate, a quartz substrate, or a plastic substrate,

wherein the light-transmitting second layer has a plurality of curved convex portions and a flat portion which surrounds the plurality of curved convex portions, each curved convex portion overlapping one of the plurality of light emitting elements,

wherein each of the plurality of light emitting elements comprises a first electrode and a second electrode with an electroluminescent layer sandwiched therebetween,

wherein the plurality of curved convex portions and the flat portion each overlap with the first electrode and the electroluminescent layer,

wherein the light-transmitting second layer is in direct contact with a top surface of the electroluminescent layer, and

wherein the second electrode is confined in a region which overlaps with the plurality of curved convex portions.

7. The device according to claim 6,

wherein the electroluminescent layer comprises:

a first organic electroluminescent layer;

a second organic electroluminescent layer over the first organic electroluminescent layer; and

a charge generation layer between the first and the second organic electroluminescent layers.

8. The device according to claim 7, wherein the charge generation layer comprises molybdenum oxide.

9. The device according to claim 6, wherein the device is a laser oscillator.

10. The device according to claim 6,

wherein the first electrode and the electroluminescent layer are shared by the plurality of light emitting elements, and

wherein the second electrode is fully overlapped by at least one of the plurality of curved convex portions.

11. A display device comprising a backlight including the device according to claim 6.

12. A device comprising:

a first layer selected from a glass substrate, a quartz substrate, a plastic substrate, or a resin film;

a second layer over and in contact with the first layer, the second layer comprises a transition metal oxide or a transition metal nitride;

a light emitting element over the second layer; and

a light-transmitting third layer covering the light emitting element, the light-transmitting third layer being selected from a glass substrate, a quartz substrate, or a plastic substrate,

wherein the light-transmitting third layer has a curved convex portion which overlaps with the light emitting element and a flat portion around the curved convex portion,

wherein the light emitting element comprises a first electrode and a second electrode with an electroluminescent layer sandwiched therebetween,

wherein the curved convex portion and the flat portion each overlap with the first electrode and the electroluminescent layer,

wherein the light-transmitting third layer is in direct contact with a top surface of the electroluminescent layer, and

wherein the second electrode is confined in a region which overlaps with the curved convex portion.

13. The device according to claim 12,

wherein the electroluminescent layer comprises:

a first organic electroluminescent layer;

a second organic electroluminescent layer over the first organic electroluminescent layer; and

a charge generation layer between the first and the second organic electroluminescent layers.

14. The device according to claim 13, wherein the charge generation layer comprises molybdenum oxide.

15. The device according to claim 12, wherein a refractive index of the first layer is lower than a refractive index of the second layer.

16. The device according to claim 12, wherein the device is a laser oscillator.

17. A display device comprising a backlight including the device according to claim 12.

18. A device comprising:

a first layer selected from a glass substrate, a quartz substrate, a plastic substrate, or a resin film;

a second layer over and in contact with the first layer, the second layer comprises a transition metal oxide or a transition metal nitride;

a plurality of light emitting elements arranged in a matrix over the second layer; and

a light-transmitting third layer covering the plurality of light emitting elements, the light-transmitting third layer being selected from a glass substrate, a quartz substrate, or a plastic substrate,

wherein the light-transmitting third layer has a plurality of curved convex portions and a flat portion around the curved convex portions, each curved convex portion overlapping one of the plurality of light emitting elements,

wherein each of the plurality of light emitting elements comprises a first electrode and a second electrode with an electroluminescent layer sandwiched therebetween,

wherein the curved convex portions and the flat portion each overlap with the first electrode and the electroluminescent layer,

wherein the light-transmitting third layer is in direct contact with a top surface of the electroluminescent layer, and

wherein the second electrode is confined in a region which overlaps with the plurality of curved convex portions.

19. The device according to claim 18,

wherein the electroluminescent layer comprises:

a first organic electroluminescent layer over the first electrode;

a second organic electroluminescent layer over the first organic electroluminescent layer; and

a charge generation layer between the first and the second organic electroluminescent layers.

20. The device according to claim 19, wherein the charge generation layer comprises molybdenum oxide.

21. The device according to claim 18, wherein a refractive index of the first layer is lower than a refractive index of the second layer.

22. The device according to claim 18, wherein the device is a laser oscillator.

23. A display device comprising a backlight including the device according to claim 18.