MICROCAPSULAR QUANTUM DOT-POLYMER COMPOSITE, METHOD FOR PRODUCING THE COMPOSITE, OPTICAL ELEMENTS, AND METHOD FOR PRODUCING THE OPTICAL ELEMENTS

• US 20150072092A1
• Filed: 03/15/2013
• Published: 03/12/2015
• Est. Priority Date: 03/16/2012
• Status: Active Grant

• Current Assignee: Industry-Academia Cooperation Group of Sejong University
• Original Assignee: Industry-Academia Cooperation Group of Sejong University
• Inventors: Kim, Hyo Sun, Seo, Young Soo, Yang, Hee Sung, Park, Sang Yul, Son, Hye Mi
• Granted Patent: US 10,069,044 B2
• Time in Patent Office: Days
• US Class Current: 428/36.91
• CPC Class Codes: C09K 11/02 Use of particular materials as binders, particle coatings or suspension media therefor
• CPC Class Codes: C09K 11/565 with zinc cadmium
• CPC Class Codes: C09K 11/883 with zinc or cadmium
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48227 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2224/48237 connecting the wire to a die pad of the item
• 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 2924/181 Encapsulation
• CPC Class Codes: H01L 2933/0041 relating to wavelength conversion elements
• CPC Class Codes: H01L 33/502 Wavelength conversion materials
• CPC Class Codes: Y10T 428/1393 Multilayer [continuous layer]
• CPC Class Codes: Y10T 428/31801 Of wax or waxy material

Abstract

There are provided a microcapsular quantum dot-polymer composite, a method for producing the composite, optical elements, and a method for producing the optical elements. In order to produce the microcapsular quantum dot-polymer composite, a polymer having a functional group in the side chain is firstly heated in a first solvent to form a polymer solution. A quantum dot suspension consisting of quantum dots capped by a capping layer dispersed in a second solvent is added to the polymer solution to form a mixed solution. The mixed solution is cooled to form the quantum dot-polymer composite consisting of the quantum dots dispersed in the polymer matrix.

Claims

1-22. -22. (canceled)

23. A quantum dot-polymer composite comprising:

a polymer matrix containing a polymer having a polar functional group in a side chain; and

quantum dots dispersed in the polymer matrix.

24. The quantum dot-polymer composite of claim 23, wherein the polymer is a crystalline polymer.

25. The quantum dot-polymer composite of claim 23, wherein the polymer is a partially oxidized polyolefin wax, or a polyolefin-polymaleic anhydride copolymer wax.

26. The quantum dot-polymer composite of claim 23, wherein the polymer has an acid value of 3 to 40 mgKOH/g.

27. The quantum dot-polymer composite of claim 23, wherein the polymer has a crosslinkable substituent.

28. The quantum dot-polymer composite of claim 23, wherein the polymer matrix further includes a high-molecular-weight polymer having a higher average molecular weight than the polymer having a polar functional group in the side chain.

29. The quantum dot-polymer composite of claim 28, wherein the high-molecular-weight polymer is the same polymer as a main chain of the polymer having a polar functional group in the side chain.

30. The quantum dot-polymer composite of claim 28, wherein the high-molecular-weight polymer is an LDPE or an HDPE.

31. The quantum dot-polymer composite of claim 23, further comprising inorganic particles disposed on the surface of the quantum dot-polymer composite.

59. The quantum dot-polymer composite of claim 23, wherein the polymer matrix has a plurality of laminated crystalline plates, and the quantum dots are dispersed between the crystalline plates.

60. The quantum dot-polymer composite of claim 23, wherein the polymer matrix constitutes a crystalline particle, and the quantum dots are dispersed in the crystalline particle.

61. The quantum dot-polymer composite of claim 24, wherein the polymer matrix has a recrystallized wax.

32. A method for producing an optical device comprising:

providing a base substrate; and

providing a suspension in which quantum dot-polymer composites are dispersed on one surface of the base substrate,

wherein the quantum dot-polymer composite has a polymer matrix containing a polymer having a polar functional group in a side chain, and quantum dots dispersed in the polymer matrix.

34. The method of claim 32, wherein the base substrate is a substrate on which a light emitting diode is mounted, and the providing of the suspension on the base substrate denotes providing a mixed solution in which a sealing resin is mixed with the suspension on the base substrate.

35. The method of claim 34, wherein the polymer having a polar functional group in the side chain has a crosslinkable substituent, and the crosslinkable substituent is also cured at the same time at which the sealing resin is cured.

37. The method of claim 32, wherein the polymer matrix further includes a high-molecular-weight polymer having a higher average molecular weight than the polymer having a polar functional group in the side chain.

33. (canceled)

36. (canceled)

38. (canceled)

39. An optical device comprising:

a base substrate; and

an optical conversion layer disposed on one surface of the base substrate and including quantum dot-polymer composites,

wherein the quantum dot-polymer composite includes a polymer matrix containing a polymer having a polar functional group in a side chain, and quantum dots dispersed in the polymer matrix.

40. The optical device of claim 39, wherein the base substrate is a plate-type substrate, and the optical conversion layer is disposed on an upper surface of the base substrate.

41. The optical device of claim 39, wherein the base substrate is a tube-type substrate, and the optical conversion layer is disposed on an inner surface of the base substrate.

42. The optical device of claim 39, wherein the base substrate is a substrate on which a light emitting diode is mounted, and the optical conversion layer is a layer in which the quantum dot-polymer composites are dispersed in a sealing resin.

43. The optical device of claim 39, wherein the polymer having a polar functional group in the side chain has a crosslinkable substituent, and the polymer having a polar functional group in the side chain is cured through the crosslinkable substituent.

44. The optical device of claim 39, wherein the polymer matrix further includes a high-molecular-weight polymer having a higher average molecular weight than the polymer having a polar functional group in the side chain.

45-58. -58. (canceled)