LIGHT EMITTING DEVICE PACKAGE USING QUANTUM DOT, ILLUMINATION APPARATUS AND DISPLAY APPARATUS

• US 20110303940A1
• Filed: 06/13/2011
• Published: 12/15/2011
• Est. Priority Date: 06/14/2010
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Park, Il Woo, Kwak, Chang Hoon, LEE, Hyo Jin
• Application Number:
  US13/159,120
• Publication Number:
  US 20110303940A1
• Time in Patent Office: Days
• US Class Current: 257/98
• CPC Class Codes: F21V 23/005 the substrate is supporting also the light source
• CPC Class Codes: H01L 2224/14 of a plurality of bump connectors
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 24/97 the devices being connected to a common substrate, e.g. interposer, said common substrate being separable into individual assemblies after connecting
• CPC Class Codes: H01L 27/156 two-dimensional arrays
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/00012 Relevant to the scope of the group, the symbol of which is combined with the symbol of this group
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2924/12041 LED
• CPC Class Codes: H01L 2924/181 Encapsulation
• CPC Class Codes: H01L 2933/0041 relating to wavelength conversion elements
• CPC Class Codes: H01L 2933/005 relating to encapsulations
• CPC Class Codes: H01L 2933/0066 relating to arrangements for conducting electric current to or from the semiconductor body
• CPC Class Codes: H01L 33/04 with a quantum effect structure or superlattice, e.g. tunnel junction
• CPC Class Codes: H01L 33/505 characterised by the shape, e.g. plate or foil
• CPC Class Codes: H01L 33/507 the elements being in intimate contact with parts other than the semiconductor body or integrated with parts other than the semiconductor body
• CPC Class Codes: H01L 33/54 having a particular shape
• CPC Class Codes: H01L 33/58 Optical field-shaping elements
• CPC Class Codes: H01L 33/60 Reflective elements
• CPC Class Codes: H01L 33/62 : Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls

Abstract

There is provided a light emitting device package using a quantum dot, an illumination apparatus and a display apparatus. The light emitting device package includes a light emitting device; a sealing part disposed in a path of light emitted from the light emitting device and having a lens shape; and a wavelength conversion part sealed within the sealing part and including a quantum dot. The light emitting device package uses the quantum dot as the wavelength conversion part to thereby achieve superior color reproducibility and light emission efficiency, and facilitates the control of color coordinates by adjusting the particle size and concentration of the quantum dot.

Claims

1. A light emitting device package comprising:

a light emitting device;

a sealing part disposed in a path of light emitted from the light emitting device and having a lens shape; and

a wavelength conversion part sealed within the sealing part and including a quantum dot.

2. The light emitting device package of claim 1, wherein the sealing part has an outer surface and an inner surface facing the light emitting device,

wherein the outer and inner surfaces have a convex shape towards an upper part of the light emitting device.

3. The light emitting device package of claim 2, wherein the light emitting device is disposed to be enclosed by the inner surface having the convex shape.

4. The light emitting device package of claim 3, further comprising a transparent encapsulation part filling a space defined by the inner surface of the sealing part.

5. The light emitting device package of claim 1, further comprising a pair of lead frames,

wherein one of the pair of lead frames is provided as a mounting area for the light emitting device.

6. The light emitting device package of claim 5, further comprising a pair of conductive wires electrically connecting the light emitting device to the pair of lead frames,

wherein the pair of conductive wires are disposed to be enclosed by the inner surface having the convex shape.

7. The light emitting device package of claim 1, further comprising a package body providing a mounting area for the light emitting device and reflecting the light emitted from the light emitting device in a direction in which the sealing part is disposed.

8. The light emitting device package of claim 7, wherein the package body includes:

a transparent resin; and

light reflective particles dispersed in the transparent resin.

9. The light emitting device package of claim 7, further comprising a conductive wire transferring an electrical signal to the light emitting device,

wherein a portion of the conductive wire is disposed within the package body.

10. The light emitting device package of claim 7, further comprising a pair of external terminals extending from side surfaces of the package body to a lower surface thereof and electrically connected to the light emitting device.

11. The light emitting device package of claim 1, wherein the sealing part is formed of a glass or polymer material.

12. The light emitting device package of claim 1, wherein the wavelength conversion part further includes an organic solvent or a polymer resin having the quantum dot dispersed therein.

13. The light emitting device package of claim 12, wherein the organic solvent includes at least one of toluene, chloroform and ethanol.

14. The light emitting device package of claim 12, wherein the polymer resin includes at least one of epoxy resin, silicone resin, polysthylene resin and acrylate resin.

15. The light emitting device package of claim 1, wherein the quantum dot includes at least one of an Si-based nanocrystal, a group II-VI compound semiconductor nanocrystal, a group III-V compound semiconductor nanocrystal, a group IV-VI compound semiconductor nanocrystal or a mixture thereof.

16. The light emitting device package of claim 15, wherein the group II-VI compound semiconductor nanocrystal is selected from the group consisting of CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, HgS, HgSe, HgTe, CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HggZnTe, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe and HgZnSTe.

17. The light emitting device package of claim 15, wherein the group III-V compound semiconductor nanocrystal is selected from the group consisting of GaN, GaP, GaAs, AlN, Alp, AlAs, InN, InP, InAs, GaNP, GaNAs, GaPAs, AlNP, AlNAs, AlPAs, InNP, InNAs, InPAs, GaAlNP, GaAlNAs, GaAlPAs, GaInNP, GaInNAs, GaInPAs, InAlNP, InAlNAs, and InAlPAs.

18. The light emitting device package of claim 15, wherein the group IV-VI compound semiconductor nanocrystal is SbTe.

19. The light emitting device package of claim 1, wherein the quantum dot includes a first quantum dot having a peak wavelength within a green light wavelength band.

20. The light emitting device package of claim 1, wherein the quantum dot includes a second quantum dot having a peak wavelength within a red light wavelength band.

21. The light emitting device package of claim 1, wherein the light emitting device emits blue light, and

the quantum dot includes a first quantum dot having a peak wavelength within a green light wavelength band and a second quantum dot having a peak wavelength within a red light wavelength band.

22. The light emitting device package of claim 21, wherein the light emitted from the light emitting device has a wavelength of 435 nm to 470 nm,

green light emitted from the first quantum dot has a color coordinate falling within a region defined by four coordinate points (0.1270, 0.8037), (0.4117, 0.5861), (0.4197, 0.5316) and (0.2555, 0.5030) based on the CIE 1931 chromaticity diagram, and

red light emitted from the second quantum dot has a color coordinate falling within a region defined by four coordinate points (0.5448, 0.4544), (0.7200, 0.2800), (0.6427, 0.2905) and (0.4794, 0.4633) based on the CIE 1931 chromaticity diagram.

23. The light emitting device package of claim 22, wherein green light emitted from the first quantum dot has a color coordinate falling within a region defined by four coordinate points (0.1270, 0.8037), (0.3700, 0.6180), (0.3700, 0.5800) and (0.2500, 0.5500) based on the CIE 1931 chromaticity diagram, and

red light emitted from the second quantum dot has a color coordinate falling within a region defined by four coordinate points (0.6000, 0.4000), (0.7200, 0.2800), (0.6427, 0.2905) and (0.6000, 0.4000) based on the CIE 1931 chromaticity diagram.

24. The light emitting device package of claim 21, wherein the light emitted from the light emitting device has a full-width half-maximum of 10 nm to 30 nm,

light emitted from the first quantum dot has a full-width half-maximum of 10 nm to 60 nm, and

light emitted from the second quantum dot has a full-width half-maximum of 30 nm to 80 nm.

25. The light emitting device package of claim 1, wherein the light emitting device emits ultraviolet light, and

the quantum dot includes a first quantum dot having a peak wavelength within a blue light wavelength band, a second quantum dot having a peak wavelength within a green light wavelength band and a third quantum dot having a peak wavelength within a red light wavelength band.

37. An illumination apparatus comprising:

the light emitting device package of claim 1; and

a power supply unit supplying power to the light emitting device package.

38. The illumination apparatus of claim 37, wherein the power supply unit includes:

an interface receiving the power; and

a power controlling part controlling the power supplied to the light emitting device package.

39. A display apparatus comprising:

the light emitting device package of claim 1; and

a display panel displaying an image and receiving light emitted from the light emitting device package.

26. A light emitting device package comprising:

a light emitting device;

a sealing part attached to a surface of the light emitting device;

a wavelength conversion part sealed within the sealing part and including a quantum dot; and

a pair of electrodes disposed on the light emitting device to be opposed to the sealing part.

27. The light emitting device package of claim 26, further comprising a package body covering surfaces of the light emitting device other than the surface of the light emitting device attached to the sealing part and reflecting light emitted from the light emitting device in a direction in which the sealing part is disposed.

28. The light emitting device package of claim 27, wherein the package body includes:

a transparent resin; and

light reflective particles dispersed in the transparent resin.

29. The light emitting device package of claim 27, wherein the package body allows a pair of electrodes to be exposed outwardly.

30. The light emitting device package of claim 26, wherein the sealing part has a convex lens shape.

31. The light emitting device package of claim 26, wherein the sealing part has a rectangular parallelepiped shape.

32. The light emitting device package of claim 26, wherein the wavelength conversion part has a shape corresponding to that of the sealing part.

33. The light emitting device package of claim 26, wherein the light emitting device comprises a plurality of light emitting devices, each having the pair of electrodes.

34. The light emitting device package of claim 33, wherein the sealing part and the wavelength conversion part are integrally formed as a single piece with respect to the plurality of light emitting devices.

35. The light emitting device package of claim 33, further comprising a package body covering surfaces of each of the plurality of light emitting devices other than the surface of the light emitting device attached to the sealing part and reflecting light emitted from the light emitting device in a direction in which the sealing part is disposed.

36. The light emitting device package of claim 35, further comprising external terminals provided along a surface of the package body and connected to the pair of electrodes.