WO2021184440A1 - 量子棒及包含其的量子棒膜与显示装置 - Google Patents

量子棒及包含其的量子棒膜与显示装置 Download PDF

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Publication number
WO2021184440A1
WO2021184440A1 PCT/CN2020/083344 CN2020083344W WO2021184440A1 WO 2021184440 A1 WO2021184440 A1 WO 2021184440A1 CN 2020083344 W CN2020083344 W CN 2020083344W WO 2021184440 A1 WO2021184440 A1 WO 2021184440A1
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Prior art keywords
quantum
quantum rod
rod
film
organic
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French (fr)
Inventor
周淼
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TCL China Star Optoelectronics Technology Co Ltd
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TCL China Star Optoelectronics Technology Co Ltd
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Priority to US16/756,924 priority Critical patent/US11952519B2/en
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent materials, e.g. electroluminescent or chemiluminescent
    • C09K11/08—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials
    • C09K11/88—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials containing selenium, tellurium or unspecified chalcogen elements
    • C09K11/881—Chalcogenides
    • C09K11/883—Chalcogenides with zinc or cadmium
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent materials, e.g. electroluminescent or chemiluminescent
    • C09K11/02—Use of particular materials as binders, particle coatings or suspension media therefor
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent materials, e.g. electroluminescent or chemiluminescent
    • C09K11/08—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials
    • C09K11/0805—Chalcogenides
    • C09K11/0811—Chalcogenides with zinc or cadmium
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133509—Filters, e.g. light shielding masks
    • G02F1/133514—Colour filters
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133617—Illumination with ultraviolet light; Luminescent elements or materials associated to the cell
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y20/00—Nanooptics, e.g. quantum optics or photonic crystals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y40/00—Manufacture or treatment of nanostructures
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B2207/00—Coding scheme for general features or characteristics of optical elements and systems of subclass G02B, but not including elements and systems which would be classified in G02B6/00 and subgroups
    • G02B2207/101—Nanooptics
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362—Active matrix addressed cells
    • G02F1/136222—Colour filters incorporated in the active matrix substrate
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2202/00—Materials and properties
    • G02F2202/36—Micro- or nanomaterials

Definitions

  • the present disclosure relates to the field of display technology, and in particular to a quantum rod, a quantum rod film containing the same, and a display device.
  • liquid crystal displays used color filters containing red, green, and blue color resists and white light backlights to achieve color display.
  • the absorption spectrum of the color resistor is relatively wide, so the spectrum of white light after passing through the color resistor is also relatively broad, which in turn leads to a lower color gamut of the liquid crystal display.
  • liquid crystal displays use Quantum Dot (QD) color filters and blue backlights to increase the color gamut.
  • QD Quantum Dot
  • the fluorescence emitted by quantum dots is not polarized, so the brightness will drop by more than 50% after passing through the polarizer.
  • Quantum rods (QR) have morphological anisotropy, so the emitted fluorescence has polarization, which can improve the aforementioned problems.
  • a quantum rod which includes a core, a shell layer and a rod-shaped protective layer.
  • the core is composed of cadmium sulfide.
  • the shell layer is composed of zinc selenide and covers the core.
  • the rod-shaped protective layer is composed of zinc sulfide and covers the shell layer.
  • the emission peak position of the quantum rod can be adjusted by adjusting the size of the core and the thickness of the shell layer.
  • the quantum rod further includes an organic water blocking layer covering the rod-shaped protective layer.
  • the organic water blocking layer is composed of hydrogel.
  • the quantum rod further includes several ligands, which are bonded to the rod-shaped protective layer.
  • the plurality of ligands include organic phosphorus, organic phosphorus oxide, organic phosphoric acid, organic amine, organic carboxylic acid, organic carboxylic acid ester, alkene, alkyl mercaptan, pyridine, or a combination thereof.
  • the present disclosure also provides a quantum rod film, which includes a thin film and a plurality of the aforementioned quantum rods aligned in the thin film.
  • the long axes of the plurality of quantum rods are parallel to each other and parallel to the thin film.
  • the present disclosure also provides a display device, which includes a display panel, a backlight module, and a first quantum rod film disposed between the backlight module and the display panel.
  • the first quantum rod film includes a plurality of the aforementioned quantum rods arranged in an orientation.
  • the display panel is a liquid crystal display panel, which includes a first substrate and a second substrate disposed opposite to each other, and a liquid crystal layer disposed between the first substrate and the second substrate.
  • the first substrate sequentially includes a substrate, a thin film transistor layer, and a second quantum rod film in a direction from the first substrate toward the second substrate.
  • the second quantum rod film includes a plurality of the aforementioned quantum rods arranged in an orientation.
  • the first substrate or the second substrate includes a color filter.
  • the color filter includes several green filter units, several red filter units, and several blue filter units, and the several green filter units include a number of the aforementioned quantum rods arranged in a directional arrangement.
  • the quantum rod of the present invention uses (1) a cadmium sulfide core that emits blue and green light, and (2) uses a zinc selenide shell to cover the core, so that the blue-green light emitted by the core is redshifted to green light. , To form green light-emitting core-shell quantum dots, (3) The core-shell quantum dots are covered with a zinc sulfide rod-shaped protective layer, so that the green light emitted by the core-shell quantum dots is polarized and the quantum limit is improved Function to improve luminous efficiency and reliability.
  • the excitation wavelength of the quantum rod of the present invention is about 445-450 nm and the excitation peak position is about 450 nm, which is close to the emission wavelength of the blue light-emitting diode in the commonly used blue light source at 447-452 nm. Therefore, the quantum rod of the present invention
  • the absorption efficiency of the blue backlight source is high, so that the excitation efficiency of the quantum rod of the present invention is high.
  • the quantum rod of the present invention emits green light with a wavelength of about 520-550 nm, and the emission peak position can be adjusted by adjusting the core size and the thickness of the shell layer.
  • the preferred emission peak position is about 525 nm.
  • the light emitted by the quantum rod of the invention is polarized and has high transmittance to the polarizer. Therefore, the quantum rod film composed of the quantum rods of the present invention is applied to a display device, for example, as a polarizing plate arranged between the backlight module and the display panel, a polarizing plate built in the display panel, or patterned Later, they are used as several green filter units in the color filter to improve the performance of the display device.
  • FIG. 1 is a schematic diagram of a quantum rod according to an embodiment of the disclosure.
  • Fig. 2 is a schematic diagram of the energy band of the quantum rod of Fig. 1.
  • FIG. 3 is a schematic diagram of the quantum rod film omitting ligands according to an embodiment of the disclosure.
  • FIG. 4 is a schematic diagram of a display device according to an embodiment of the disclosure.
  • Figure 5 shows that the display panel of Figure 4 is COA (ColorFilter Schematic diagram of on Array) type liquid crystal display panel.
  • FIG. 6 is a schematic diagram of the display panel of FIG. 4 being a non-COA liquid crystal display panel.
  • the present disclosure provides a quantum rod 100, which includes a core 10 composed of cadmium sulfide, a shell layer 20 composed of zinc selenide, and a rod-shaped protective layer 30 composed of zinc sulfide.
  • the shell layer 20 covers the core 10 to form a core-shell quantum dot 25.
  • the rod-shaped protective layer 30 covers the core-shell type quantum dots 25.
  • the core-shell quantum dot 25 is close to one end of the rod-shaped protective layer 30.
  • the core-shell type quantum dot 25 may be located at any position in the rod-shaped protective layer 30.
  • the excitation wavelength of the core 10 composed of cadmium sulfide is about 445-450 nm and the excitation peak position is about 450 nm, which is the same as the emission wavelength of the blue light-emitting diode in the commonly used blue backlight source. 452 nm is similar.
  • the core 10 emits blue and green light after being excited.
  • the shell layer 20 composed of zinc selenide redshifts the blue-green light emitted by the core 10 to green light.
  • the rod-shaped protective layer 30 composed of zinc sulfide enables the green light emitted by the core-shell type quantum dots 25 to be polarized, and improves the quantum confinement effect, thereby improving the luminous efficiency and reliability.
  • the excitation wavelength of the quantum rod 100 is about 445-450 nm and the excitation peak position is about 450 nm, which is similar to the emission wavelength of the blue light-emitting diode in the commonly used blue light source, 447-452 nm, so the quantum The rod 100 has a high absorption efficiency for the blue backlight source, and thus the excitation efficiency of the quantum rod 100 is high.
  • the quantum rod 100 emits green light with a wavelength of about 520-550 nm, and the emission peak position can be adjusted by adjusting the core size and the thickness of the shell layer.
  • the preferred emission peak position is about 525 nm.
  • the core 10 has a spherical shape with a radius of 3-5 nm, and the thickness of the shell layer is 2-5 zinc selenide monolayers, but this is not the case. Furthermore, the light emitted by the quantum rod 100 is polarized and has a high transmittance to the polarizer. By adjusting the aspect ratio of the rod-shaped protective layer 30, the polarization of the light emitted by the quantum rod 100 can be adjusted.
  • the quantum rod 100 may further include an organic water blocking layer 40, covering the rod-shaped protective layer 30, so that the quantum rod can be combined with a dispersant in the quantum rod film formulation Isolate other components, thereby improving the fluorescence yield and stability of the quantum rod.
  • the organic water blocking layer may be composed of hydrogel.
  • Hydrogels can be composed of natural hydrophilic polymers, such as polysaccharides such as cellulose, alginic acid, hyaluronic acid, chitosan, and polypeptides such as collagen, poly-L-lysine, and poly-L-glutamic acid kind. Hydrogels can also be composed of synthetic hydrophilic polymers, such as polyvinyl alcohol, polyacrylic acid, polymethacrylic acid, polyacrylamide, and polyN-polyacrylamide.
  • the quantum rod 100 may further include a plurality of ligands 50 bonded to the rod-shaped protective layer 30.
  • the ligand 50 may include organic phosphorus, organic phosphorus oxide, organic phosphoric acid, organic amine, organic carboxylic acid, organic carboxylic acid ester, olefin, alkyl mercaptan, pyridine, or a combination thereof.
  • the organic phosphorus may be an organic phosphorus having 3 to 108 carbon atoms, such as trioctyl phosphine (TOP) and tributyl phosphine (TBP), but is not limited thereto.
  • the organic phosphorus oxide may be an organic phosphorus oxide having 3 to 108 carbon atoms, such as trioctylphosphine oxide (TOPO), but is not limited thereto.
  • the organic phosphoric acid may be an organic phosphoric acid having 3 to 108 carbon atoms, such as hexyl phosphonic acid (HPA), dodecyl phosphonic acid (DDPA), tetradecyl phosphonic acid (TDPA) and octadecyl phosphonic acid (ODPA), but not limited to this.
  • HPA hexyl phosphonic acid
  • DDPA dodecyl phosphonic acid
  • TDPA tetradecyl phosphonic acid
  • ODPA octadecyl phosphonic acid
  • Organic amines can be primary or secondary amines with 1-36 carbon atoms, such as oleyl amine (OLA), dodecyl amine (DDA), tetradecyl amine (TDA), hexadecyl amine ( HDA), octadecylamine (ODA) and polyethyleneimine (PEI), but not limited to these.
  • the organic carboxylic acid may be an organic carboxylic acid having 2 to 30 carbon atoms, such as oleic acid, stearic acid, myristic acid, mercaptopropionic acid, and mercaptoundecanoic acid, but is not limited thereto.
  • the organic carboxylic acid ester may be a carboxylic acid ester having 2 to 30 carbon atoms, such as myristate, palmitate, laurate, stearate, and oleate, but is not limited thereto.
  • the olefin may be 1-octadecene (ODE), but is not limited thereto.
  • the alkyl mercaptan may be hexadecyl mercaptan and hexane mercaptan, but is not limited thereto.
  • the ligand 50 may be bonded to the rod-shaped protective layer 30 in any suitable manner, for example, to deprotonate the organic carboxylic acid.
  • the purpose of the ligand 50 is to make the quantum rod 100 easier to disperse in a solvent.
  • the ligand 50 whose end group is hydrophobic or hydrophilic can be used according to the type of solvent.
  • the method for preparing the quantum rod 100 includes: preparing a spherical cadmium sulfide with a radius of 3 nm to 5 nm to form a core 10; then coating the core 10 with zinc selenide with a thickness of 2-5 monolayers, To form a shell layer 20; then, zinc sulfide is coated on the shell layer 20, and the zinc sulfide is grown into a rod shape to form a rod-shaped protective layer 30.
  • the preparation method of the quantum rod 100 further includes: bonding a plurality of ligands 50 to the rod-shaped protective layer 30 and/or coating the rod-shaped protective layer 30 with an organic water blocking layer 40.
  • the present disclosure also provides a quantum rod film 120, which includes a thin film 110 and a plurality of quantum rods 100 as shown in FIG. 1 (the ligand 50 is omitted) aligned in the thin film 110.
  • the long axes of the plurality of quantum rods 100 are parallel to each other.
  • the long axes of the plurality of quantum rods 100 are parallel to the thin film 110.
  • the long axes of the plurality of quantum rods 120 may not be parallel to the thin film 110.
  • Several quantum rods 100 in the quantum rod film 120 can emit green linearly polarized light under the excitation of blue light.
  • the quantum rod film 120 can be used as a built-in polarizer of the display panel or a polarizer disposed between the display panel and the blue backlight module to improve the transmittance, brightness, and display color gamut of the display panel.
  • the quantum rod film 120 may also include blue light quantum dots/rods and red light quantum dots/rods. When illuminated by a blue backlight, the light emitted by the quantum rod film 120 is composed of red linearly polarized light, green linearly polarized light, and blue light. Color linearly polarized light is mixed to form white linearly polarized light.
  • the manufacturing method includes: dispersing several quantum rods 100 in a thermosetting glue or ultraviolet light curing glue; optionally adding a dispersant and other components; coating on a substrate Film formation; using a stretching method, an electric drive method, a photo-alignment method, etc., to arrange several quantum rods 100 in the same direction; and heat or ultraviolet light to cure the quantum rod film 120.
  • the thermal curing adhesive may be epoxy resin, silica gel, polymethyl methacrylate (PMMA), polycarbonate (PC), or a combination thereof, but is not limited thereto.
  • the UV curable adhesive may be acrylic resin, but is not limited thereto. That is, the film 110 includes a thermal curing adhesive or an ultraviolet curing adhesive.
  • the quantum rod film 120 can also be patterned to form several green filter units in the color filter.
  • the manufacturing method includes: dispersing several quantum rods 100 in a photoresist, preferably a negative photoresist; coating a film on a substrate; adopting A stretching method, an electric drive method, a photo-alignment method, etc. arrange several quantum rods 100 in the same direction; cure them into a quantum rod film 120; and pattern the quantum rod film 120 into several green filter units by a photolithography process . That is, the film 110 includes photoresist, preferably a negative photoresist.
  • the manufacturing method may also include: dispersing several quantum rods 100 in ink for inkjet printing; forming several green filter units by an inkjet printing process; A stretching method, an electric driving method, a photo-alignment method, etc. arrange several quantum rods 100 in the same direction; and solidify several green filter units.
  • the ink for inkjet printing may include a film-forming resin, a dispersion resin, a photopolymerizable monomer, a photoinitiator, a leveling agent, and a solvent, but is not limited thereto.
  • the film 110 contains resin. Please refer to FIG. 4 to FIG. 6 and the following description for the aforementioned practical application of the quantum rod film 120.
  • the present disclosure provides a display device 200, which includes a display panel 230, a blue backlight module 210, and a blue backlight module 210 and the display panel 230 disposed between The first quantum rod film 220.
  • the display panel 230 may be a liquid crystal display panel, a light emitting diode (LED) display panel, or an organic light emitting diode (OLED) display panel.
  • the blue backlight module 210 includes a blue light-emitting diode layer 211.
  • the blue light-emitting diode layer 211 includes several blue light-emitting diodes.
  • the first quantum rod film 220 includes a plurality of quantum rods 100 as shown in FIG. 1 arranged in an orientation to be used as a polarizer.
  • the long axes of the plurality of quantum rods 100 are parallel to each other, and may be parallel to the first quantum rod film 220.
  • Each core-shell type quantum dot 25 may be located at one end of the rod-shaped protective layer 30 close to the first quantum rod film 220.
  • the first quantum rod film 220 may also include blue light quantum dots/rods and red light quantum dots/rods. When the blue backlight is illuminated, the light emitted by the first quantum rod film 220 is composed of red linearly polarized light, green linearly polarized light, and blue light. Color linearly polarized light is mixed to form white linearly polarized light.
  • the display panel 230 is a COA (Color Filter on Array) type liquid crystal display panel 231, which includes a first substrate 240 and a second substrate 260 disposed oppositely, and a device The liquid crystal layer 250 between the first substrate 240 and the second substrate 260.
  • the first substrate 240 sequentially includes a substrate 241, a thin film transistor layer 242, a second quantum rod film 243, a color filter 244, a pixel electrode layer 245, and an alignment film 246 in a direction from the second substrate 260.
  • the substrate 241 of the first substrate 240 is disposed on the blue backlight module 210.
  • the second quantum rod film 243 includes a plurality of quantum rods 100 as shown in FIG.
  • the long axes of the plurality of quantum rods 100 are parallel to each other, and may be parallel to the second quantum rod film 243.
  • Each core-shell type quantum dot 25 may be located at one end of the rod-shaped protective layer 30 close to the second quantum rod film 243.
  • the long axis direction of the quantum rod 100 in the second quantum rod film 243 may be the same as or different from the long axis direction of the quantum rod 100 in the first quantum rod film 220.
  • the second quantum rod film 243 may also include blue light quantum dots/rods and red light quantum dots/rods.
  • the light emitted by the second quantum rod film 243 is composed of red linearly polarized light, green linearly polarized light, and blue light. Color linearly polarized light is mixed to form white linearly polarized light.
  • the second substrate 260 sequentially includes a polarizer 261, a substrate 262, a black matrix 263, a common electrode layer 264, and an alignment film 265 in the direction from which it faces the first substrate 240.
  • the color filter 244 includes several green filter units 2441, several red filter units 2442, and several blue filter units 2443.
  • the plurality of green filter units 2441 include a plurality of quantum rods 100 as shown in FIG. 1 arranged in a directional arrangement.
  • the long axis direction of the quantum rod 100 in the several green filter units 2441 may be completely the same, partially the same or completely different from the long axis direction of the quantum rod 100 in the first quantum rod film 220 and the second quantum rod film 243 .
  • the aspect ratio, the type of the organic water blocking layer 40, and the type of the ligand 50 may be completely the same, partially the same, or completely different.
  • the display panel 230 is not limited to the COA type liquid crystal display panel 231 as shown in FIG. 5, and may also be a COA type liquid crystal display panel with other structures.
  • the display panel 230 is a non-COA type liquid crystal display panel 232, which includes a first substrate 270 and a second substrate 280 disposed oppositely, and disposed on the first substrate 270 and the liquid crystal layer 250 between the second substrate 280.
  • the first substrate 270 sequentially includes a substrate 271, a thin film transistor layer 272, a pixel electrode layer 273, a second quantum rod film 274, and an alignment film 275 in the direction from which it faces the second substrate 280.
  • the substrate 271 of the first substrate 270 is disposed on the blue backlight module 210.
  • the second quantum rod film 274 includes a plurality of quantum rods 100 as shown in FIG. 1 arranged in a directional arrangement to serve as a polarizer.
  • the long axes of the plurality of quantum rods 100 are parallel to each other, and may be parallel to the second quantum rod film 274.
  • Each core-shell type quantum dot 25 may be located at one end of the rod-shaped protective layer 30 close to the second quantum rod film 274.
  • the long axis direction of the quantum rod 100 in the second quantum rod film 274 may be the same as or different from the long axis direction of the quantum rod 100 in the first quantum rod film 220.
  • the second quantum rod film 274 may also include blue light quantum dots/rods and red light quantum dots/rods. When the blue backlight is illuminated, the light emitted by the second quantum rod film 274 is composed of red linearly polarized light, green linearly polarized light, and blue light.
  • the second substrate 280 sequentially includes a polarizer 281, a substrate 282, a black matrix 283, a color filter 284, a common electrode layer 285, and an alignment film 286 in the direction from which it faces the first substrate 270.
  • the color filter 284 includes a plurality of green filter units 2841, a plurality of red filter units 2842, and a plurality of blue filter units 2843.
  • the plurality of green filter units 2841 include a plurality of quantum rods 100 as shown in FIG. 1 arranged in a directional arrangement.
  • the long axis direction of the quantum rod 100 in the several green filter units 2841 may be completely the same, partially the same or completely different from the long axis direction of the quantum rod 100 in the first quantum rod film 220 and the second quantum rod film 274 .
  • the aspect ratio, the type of the organic water blocking layer 40, and the type of the ligand 50 may be completely the same, partially the same, or completely different.
  • the display panel 230 is not limited to the non-COA type liquid crystal display panel 232 as shown in FIG. 5, and may be other types of non-COA type liquid crystal display panels.
  • the quantum rod of the present invention uses (1) a cadmium sulfide core that emits blue and green light, and (2) uses a zinc selenide shell to cover the core, so that the blue-green light emitted by the core is redshifted to green light. , To form green light-emitting core-shell quantum dots, (3) The core-shell quantum dots are covered with a zinc sulfide rod-shaped protective layer, so that the green light emitted by the core-shell quantum dots is polarized and the quantum limit is improved Function to improve luminous efficiency and reliability.
  • the excitation wavelength of the quantum rod of the present invention is about 445-450 nm and the excitation peak position is about 450 nm, which is close to the emission wavelength of the blue light-emitting diode in the commonly used blue light source at 447-452 nm. Therefore, the quantum rod of the present invention
  • the absorption efficiency of the blue backlight source is high, so that the excitation efficiency of the quantum rod of the present invention is high.
  • the quantum rod of the present invention emits green light with a wavelength of about 520-550 nm, and the emission peak position can be adjusted by adjusting the core size and the thickness of the shell layer.
  • the preferred emission peak position is about 525 nm.
  • the light emitted by the quantum rod of the invention is polarized and has high transmittance to the polarizer. Therefore, the quantum rod film composed of the quantum rods of the present invention is applied to a display device, for example, as a polarizing plate arranged between the backlight module and the display panel, a polarizing plate built in the display panel, or patterned Later, they are used as several green filter units in the color filter to improve the performance of the display device.

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Abstract

一种量子棒（100）及包含其的量子棒膜（120）与显示装置（200）。所述量子棒（100）包含核芯（10）、壳层（20）及棒状保护层（30）。所述核芯（10）由硫化镉组成。所述壳层（20）由硒化锌组成，且包复核芯（10）。棒状保护层（30）由硫化锌组成，且包覆所述壳层（20）。

Description

量子棒及包含其的量子棒膜与显示装置 技术领域
本揭示涉及显示技术领域，特别是涉及一种量子棒及包含其的量子棒膜与显示装置。
 背景技术
在早期，液晶显示器是采用含有红色、绿色及蓝色色阻的彩色滤光片与白光背光源来实现彩色显示。然而，色阻的吸收光谱较宽，因此白光透过色阻后的光谱也比较宽，进而导致液晶显示器的色域较低。现今，液晶显示器采用量子点(Quantum Dot，QD)彩色滤光片与蓝光背光源以提高色域。然而，量子点发射的荧光不具有偏振性，因而在穿过偏光片后亮度会下降50%以上。量子棒(Quantum rod，QR)具有形貌各向异性，因此所发射的荧光具有偏振性，而能改善前述问题。
 技术问题
在现今的量子棒中，以CdSe/CdS绿光量子棒的发展最为成熟。但是，该绿光量子棒的制备不易，且其激发峰位与常用的蓝光背光源的发射峰位不符。因此，有需要研发出一种其激发峰位与常用的蓝光背光源的发射峰位相符的绿光量子棒。
 技术解决方案
为了解决现有绿光量子棒的激发峰位与蓝光背光源的发射峰位不符的技术问题，本揭示提供一种量子棒，其包含核芯、壳层及棒状保护层。所述核芯由硫化镉组成。所述壳层由硒化锌组成，包覆所述核芯。所述棒状保护层由硫化锌组成，包覆所述壳层。
在一实施例中，所述量子棒的发射峰位可通过调整所述核芯的尺寸及所述壳层的厚度来调控。
在一实施例中，所述量子棒还包含一有机阻水层，包覆所述棒状保护层。
在一实施例中，所述有机阻水层是由水凝胶组成。
在一实施例中，所述量子棒还包含数个配体，键结于所述棒状保护层。
在一实施例中，所述数个配体包含有机磷、有机磷氧化物、有机磷酸、有机胺、有机羧酸、有机羧酸酯、烯烃、烷基硫醇、吡啶或其组合。
本揭示还提供一种量子棒膜，其包含一薄膜及定向排列于所述薄膜内的数个前述量子棒。
在一实施例中，所述数个量子棒的长轴相互平行且与所述薄膜平行。
本揭示还提供一种显示装置，其包含一显示面板、一背光模组，及设置于所述背光模组与所述显示面板之间的一第一量子棒膜。所述第一量子棒膜包含定向排列的数个前述量子棒。
在一实施例中，所述显示面板为一液晶显示面板，其包含相对设置的第一基板与第二基板，以及设于第一基板与第二基板之间的液晶层。第一基板在从其朝向第二基板的方向上依序包含衬底、薄膜晶体管层及第二量子棒膜。第二量子棒膜包含定向排列的数个前述量子棒。
在一实施例中，第一基板或第二基板包括一彩色滤光片。所述彩色滤光片包含数个绿色滤光单元、数个红色滤光单元及数个蓝色滤光单元，所述数个绿色滤光单元包含定向排列的数个前述量子棒。
 有益效果
本发明量子棒通过(1) 采用发射蓝绿光的硫化镉核芯，(2)采用硒化锌壳层包复核芯，使核芯所发射出的蓝绿光红移(redshift)至绿光，以形成发射绿光的核壳型量子点，(3)采用硫化锌棒状保护层包复核壳型量子点，使核壳型量子点所发射出的绿光具有偏振性，且提高量子限域作用，进而提高发光效率和信赖性。本发明量子棒的激发波长为约445-450 nm且激发峰位为约450 nm，与常用的蓝光背光源中的蓝色发光二极体的发射波长447-452 nm相近，因此本发明量子棒对蓝光背光源的吸收效率高，进而使本发明量子棒的激发效率高。本发明量子棒发射波长为约520~550 nm的绿光，发射峰位可通过调整核芯尺寸及壳层厚度为来调控，较佳的发射峰位为约525 nm。本发明量子棒所发出的光具有偏振性，对偏光片的穿透率高。因此，将本发明量子棒所组成的量子棒膜应用于显示装置中，例如：作为设置于背光模组与显示面板之间的偏光板、内建于显示面板中的偏光板，或经图案化后作为彩色滤光片中的数个绿色滤光单元，以提高显示装置的效能。
 附图说明
为了更清楚地说明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单介绍，显而易见地，下面描述中的附图仅仅是发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本揭示实施例的量子棒的示意图。
图2为图1的量子棒的能带示意图。
图3为本揭示实施例的量子棒膜省略配体的示意图。
图4为本揭示实施例的显示装置的示意图。
图5为图4的显示面板为COA(ColorFilter on Array)型液晶显示面板的示意图。
图6为图4的显示面板为非COA型液晶显示面板的示意图。
 本发明的实施方式
请参阅图1，本揭示提供一种量子棒100，其包含由硫化镉组成的核芯10、由硒化锌组成的壳层20及由硫化锌组成的棒状保护层30。壳层20包复核芯10，以组成核壳型量子点(core-shell quantum dot)25。棒状保护层30包复核壳型量子点25。在此实施例中，所述核壳型量子点25靠近所述棒状保护层30的一端。在一实施例中，所述核壳型量子点25可位于所述棒状保护层30中的任何位置。
请参阅图2，由硫化镉组成的核芯10的激发波长为约445-450 nm且激发峰位为约450 nm，与常用的蓝光背光源中的蓝色发光二极体的发射波长447-452 nm相近。核芯10受激发后发射蓝绿光。由硒化锌组成的壳层20，使核芯10所发射出的蓝绿光红移(redshift)至绿光。由硫化锌组成的棒状保护层30使所述核壳型量子点25所发射出的绿光具有偏振性，且提高量子限域作用，进而提高发光效率和信赖性。所述量子棒100的激发波长为约445-450 nm且激发峰位为约450 nm，与常用的蓝光背光源中的蓝色发光二极体的发射波长447-452 nm相近，因此所述量子棒100对蓝光背光源的吸收效率高，进而使所述量子棒100的激发效率高。所述量子棒100发射波长为约520~550 nm的绿光，发射峰位可通过调整核芯尺寸及壳层厚度为来调控，较佳的发射峰位为约525 nm。在一实施例中，所述核芯10为半径为3-5 nm的球形，且所述壳层的厚度为2-5个硒化锌单分子层，但不于此。再者，所述量子棒100所发出的光具有偏振性，对偏光片的穿透率高。通过调控所述棒状保护层30的长径比，可调控所述量子棒100所发出的光的偏振性。
请参阅图1，在一实施例中，所述的量子棒100可还包含一有机阻水层40，包覆所述棒状保护层30，以使量子棒在量子棒膜配方中可与分散剂等其它成分隔离，进而提高量子棒的荧光产率及稳定性。所述有机阻水层可由水凝胶组成。水凝胶可由天然的亲水性高分子组成，诸如纤维素、海藻酸、透明质酸，壳聚糖等多糖类，以及胶原、聚L-赖氨酸、聚L-谷胺酸等多肽类。水凝胶亦可由合成的亲水高分子组成，诸如聚乙烯醇、聚丙烯酸，聚甲基丙烯酸，聚丙烯酰胺及聚N-聚代丙烯酰胺等。
请参阅图1，在一实施例中，所述量子棒100可还包含数个配体50，键结于所述棒状保护层30。所述配体50可包含有机磷、有机磷氧化物、有机磷酸、有机胺、有机羧酸、有机羧酸酯、烯烃、烷基硫醇、吡啶或其组合。有机磷可为具有3至108个碳原子的有机磷，诸如三辛基膦(TOP)及三丁基膦(TBP)，但不限于此。有机磷氧化物可为具有3至108个碳原子的有机磷氧化物，诸如氧化三辛基膦(TOPO)，但不限于此。有机磷酸可为具有3至108个碳原子的有机磷酸，诸如己基膦酸(HPA)、十二烷基膦酸(DDPA)、十四烷基膦酸(TDPA)及十八烷基膦酸(ODPA)，但不限于此。有机胺可为具有1-36个碳原子的一级或二级胺，诸如油胺(OLA)、十二烷基胺(DDA)、十四烷基胺(TDA)、十六烷基胺(HDA)、十八烷基胺(ODA)及聚伸乙亚胺(PEI)，但不限于此。有机羧酸可为具有2至30个碳原子的有机羧酸，诸如油酸、硬脂酸、肉豆蔻酸、乙酸巯基丙酸及巯基十一烷酸，但不限于此。有机羧酸酯可为具有2至30个碳原子的羧酸酯，诸如肉豆蔻酸酯、棕榈酸酯、月桂酸酯、硬脂酸酯及油酸酯，但不限于此。烯烃可为1-十八烯(ODE)，但不限于此。烷基硫醇可为十六烷硫醇及己烷硫醇，但不限于此。配体50可以用任何合适的方式键结至所述棒状保护层30，例如将有机羧酸去质子化。配体50的用途在于使所述量子棒100更容易分散于溶剂中。可以根据溶剂的类型使用端基为疏水性或亲水性的配体50。
所述量子棒100的制备方法包含：制备半径为3nm至5 nm的球形硫化镉，以形成核芯10；接着在核芯10上包覆厚度为2-5个单分子层的硒化锌，以形成壳层20；接着在壳层20上包覆硫化锌，并使硫化锌生长成棒状，以形成棒状保护层30。所述量子棒100的制备方法还包含：将数个配体50键结于棒状保护层30上，及/或在棒状保护层30上包覆有机阻水层40。
请参阅图3，本揭示还提供一种量子棒膜120，其包含一薄膜110及定向排列于所述薄膜110内的数个如图1所示的量子棒100(省略配体50)。所述数个量子棒100的长轴相互平行。在此实施例中，所述数个量子棒100的长轴与所述薄膜110平行。在一实施例中，所述数个量子棒120的长轴可不与所述薄膜110平行。所述量子棒膜120中的数个量子棒100在蓝光的激发下，可发出绿色线偏振光。因此，所述量子棒膜120可作为显示面板的内建的偏光片或设置于显示面板及蓝色背光模组之间的偏光片，以提高显示面板的穿透率、亮度及显示色域。所述量子棒膜120还可包含蓝光量子点/棒和红光量子点/棒，当蓝色背光照射时，所述量子棒膜120发出的光为由红色线偏振光、绿色线偏振光及蓝色线偏振光混合形成的白色线偏振光。当所述量子棒膜120欲作为偏光片时的制造方法包含：将数个量子棒100分散于热固化胶或紫外光固化胶中；任择地添加分散剂等其它成分；在基板上涂布成膜；采用拉伸法、电驱动法、光配向法等将数个量子棒100以相同方向排列；以及以热或紫外光固化成量子棒膜120。热固化胶可为环氧树脂、硅胶、聚甲基丙烯酸甲酯(PMMA)、聚碳酸酯(PC)或其组合，但不限于此。紫外光固化胶可为丙烯酸树脂，但不限于此。亦即，所述薄膜110包含热固化胶或紫外光固化胶。
此外，所述量子棒膜120亦可经图案化后形成彩色滤光片中的数个绿色滤光单元。当所述量子棒膜120欲作为绿色滤光单元时的制造方法包含：将数个量子棒100分散于光刻胶中，较佳为负性光刻胶；在基板上涂布成膜；采用拉伸法、电驱动法、光配向法等将数个量子棒100以相同方向排列；固化成量子棒膜120；以及以光刻工艺将所述量子棒膜120图案化成数个绿色滤光单元。亦即，所述薄膜110包含光刻胶，较佳为负性光刻胶。当所述量子棒膜120欲作为绿色滤光单元时的制造方法亦可包含：将数个量子棒100分散于喷墨打印用墨水中；以喷墨打印工艺形成数个绿色滤光单元；采用拉伸法、电驱动法、光配向法等将数个量子棒100以相同方向排列；以及固化数个绿色滤光单元。喷墨打印用墨水可包括成膜树脂、分散树脂、光可聚合性单体、光引发剂、流平剂和溶剂，但不限于此。此时，所述薄膜110包含树脂。前述量子棒膜120实际应用的实施例，请参图4至图6及下列说明。
请参阅图4，本揭示提供一种显示装置200，其包含一显示面板230、一蓝色背光模组210，及设置于所述蓝色背光模组210与所述显示面板230之间的一第一量子棒膜220。所述显示面板230可为液晶显示面板、发光二极体(LED)显示面板或有机发光二极体(OLED)显示面板。所述蓝色背光模组210包含一蓝色发光二极体层211。所述蓝色发光二极体层211包含数个蓝色发光二极体。第一量子棒膜220包含定向排列的数个如图1所示的量子棒100，以用作为偏光片使用。在第一量子棒膜220中，所述数个量子棒100的长轴相互平行，且可与第一量子棒膜220平行。每一核壳型量子点25可位于其棒状保护层30靠近第一量子棒膜220的一侧的一端。第一量子棒膜220还可包含蓝光量子点/棒和红光量子点/棒，当蓝色背光照射时，第一量子棒膜220发出的光为由红色线偏振光、绿色线偏振光及蓝色线偏振光混合形成的白色线偏振光。
请参阅图4及图5，在一实施例中，所述显示面板230为一COA(ColorFilter on Array)型液晶显示面板231，其包含相对设置的第一基板240与第二基板260，以及设于第一基板240与第二基板260之间的液晶层250。第一基板240在从其朝向第二基板260的方向上依序包含衬底241、薄膜晶体管层242、第二量子棒膜243、彩色滤光片244、像素电极层245及配向膜246。第一基板240的衬底241设置在所述蓝色背光模组210上。第二量子棒膜243包含定向排列的数个如图1所示的量子棒100，以作为偏光片使用。在第二量子棒膜243中，所述数个量子棒100的长轴相互平行，且可与第二量子棒膜243平行。每一核壳型量子点25可位于其棒状保护层30靠近第二量子棒膜243的一侧的一端。第二量子棒膜243中的量子棒100的长轴方向可与第一量子棒膜220中的量子棒100的长轴方向相同或不同。第二量子棒膜243还可包含蓝光量子点/棒和红光量子点/棒，当蓝色背光照射时，第二量子棒膜243发出的光为由红色线偏振光、绿色线偏振光及蓝色线偏振光混合形成的白色线偏振光。第二基板260在从其朝向第一基板240的方向上依序包含偏光片261、衬底262、黑色矩阵263、公共电极层264及配向膜265。在一实施例中，所述彩色滤光片244包含数个绿色滤光单元2441、数个红色滤光单元2442及数个蓝色滤光单元2443。所述数个绿色滤光单元2441包含定向排列的数个如图1所示的量子棒100。所述数个绿色滤光单元2441中的量子棒100的长轴方向可与第一量子棒膜220及第二量子棒膜243中的量子棒100的长轴方向完全相同、部分相同或完全不同。所述数个绿色滤光单元2441、第一量子棒膜220及第二量子棒膜243中的量子棒100在整体尺寸、核芯10的半径、壳层20的厚度、棒状保护层30的长径比、有机阻水层40的种类及配体50的种类上可完全相同、部分相同或完全不同。所述显示面板230不限于如图5所示的COA型液晶显示面板231，亦可为具有其它结构的COA型液晶显示面板。
请参阅图4及图6，在一实施例中，所述显示面板230为一非COA型液晶显示面板232，其包含相对设置的第一基板270与第二基板280，以及设于第一基板270与第二基板280之间的液晶层250。第一基板270在从其朝向第二基板280的方向上依序包含衬底271、薄膜晶体管层272、像素电极层273、第二量子棒膜274及配向膜275。第一基板270的衬底271设置在所述蓝色背光模组210上。第二量子棒膜274包含定向排列的数个如图1所示的量子棒100，以作为偏光片使用。在第二量子棒膜274中，所述数个量子棒100的长轴相互平行，且可与第二量子棒膜274平行。每一核壳型量子点25可位于其棒状保护层30靠近第二量子棒膜274的一侧的一端。第二量子棒膜274中的量子棒100的长轴方向可与第一量子棒膜220中的量子棒100的长轴方向相同或不同。第二量子棒膜274还可包含蓝光量子点/棒和红光量子点/棒，当蓝色背光照射时，第二量子棒膜274发出的光为由红色线偏振光、绿色线偏振光及蓝色线偏振光混合形成的白色线偏振光。第二基板280在从其朝向第一基板270的方向上依序包含偏光片281、衬底282、黑色矩阵283、彩色滤光片284、公共电极层285及配向膜286。在一实施例中，所述彩色滤光片284包含数个绿色滤光单元2841、数个红色滤光单元2842及数个蓝色滤光单元2843。所述数个绿色滤光单元2841包含定向排列的数个如图1所示的量子棒100。所述数个绿色滤光单元2841中的量子棒100的长轴方向可与第一量子棒膜220及第二量子棒膜274中的量子棒100的长轴方向完全相同、部分相同或完全不同。所述数个绿色滤光单元2841、第一量子棒膜220及第二量子棒膜274中的量子棒100在整体尺寸、核芯10的半径、壳层20的厚度、棒状保护层30的长径比、有机阻水层40的种类及配体50的种类上可完全相同、部分相同或完全不同。所述显示面板230不限于如图5所示的非COA型液晶显示面板232，亦可为其它类型的非COA型液晶显示面板。
本发明量子棒通过(1) 采用发射蓝绿光的硫化镉核芯，(2)采用硒化锌壳层包复核芯，使核芯所发射出的蓝绿光红移(redshift)至绿光，以形成发射绿光的核壳型量子点，(3)采用硫化锌棒状保护层包复核壳型量子点，使核壳型量子点所发射出的绿光具有偏振性，且提高量子限域作用，进而提高发光效率和信赖性。本发明量子棒的激发波长为约445-450 nm且激发峰位为约450 nm，与常用的蓝光背光源中的蓝色发光二极体的发射波长447-452 nm相近，因此本发明量子棒对蓝光背光源的吸收效率高，进而使本发明量子棒的激发效率高。本发明量子棒发射波长为约520~550 nm的绿光，发射峰位可通过调整核芯尺寸及壳层厚度为来调控，较佳的发射峰位为约525 nm。本发明量子棒所发出的光具有偏振性，对偏光片的穿透率高。因此，将本发明量子棒所组成的量子棒膜应用于显示装置中，例如：作为设置于背光模组与显示面板之间的偏光板、内建于显示面板中的偏光板，或经图案化后作为彩色滤光片中的数个绿色滤光单元，以提高显示装置的效能。
虽然本发明已以优选实施例揭露如上，但上述优选实施例并非用以限制本发明，本领域的普通技术人员，在不脱离本发明的精神和范围内，均可作各种更动与润饰，因此本发明的保护范围以权利要求界定的范围为准。

Claims (20)

  1. 一种量子棒，其包含：
    一核芯，其由硫化镉组成；
    一壳层，其由硒化锌组成，包覆所述核芯；以及
    一棒状保护层，其由硫化锌组成，包覆所述壳层。
  2. 根据权利要求1所述的量子棒，其中所述量子棒的发射峰位可通过调整所述核芯的尺寸及所述壳层的厚度来调控。
  3. 根据权利要求1所述的量子棒，其还包含一有机阻水层，包覆所述棒状保护层。
  4. 根据权利要求3所述的量子棒，其中所述有机阻水层是由水凝胶组成。
  5. 根据权利要求1所述的量子棒，其还包含数个配体，键结于所述棒状保护层。
  6. 根据权利要求5所述的量子棒，其中所述数个配体包含有机磷、有机磷氧化物、有机磷酸、有机胺、有机羧酸、有机羧酸酯、烯烃、烷基硫醇、吡啶或其组合。
  7. 一种量子棒膜，其包含一薄膜及定向排列于所述薄膜内的数个量子棒，其中每一量子棒包含：
    一核芯，其由硫化镉组成；
    一壳层，其由硒化锌组成，包覆所述核芯；以及
    一棒状保护层，其由硫化锌组成，包覆所述核壳型量子点。
  8. 根据权利要求7所述的量子棒膜，其中所述数个量子棒的长轴相互平行且与所述薄膜平行。
  9. 根据权利要求7所述的量子棒膜，其中所述量子棒的发射峰位可通过调整所述核芯的尺寸及所述壳层的厚度来调控。
  10. 根据权利要求7所述的量子棒膜，其中所述量子棒还包含一有机阻水层，包覆所述棒状保护层。
  11. 根据权利要求10所述的量子棒膜，其中所述有机阻水层是由水凝胶组成。
  12. 根据权利要求7所述的量子棒膜，其中所述量子棒还包含数个配体，键结于所述棒状保护层。
  13. 根据权利要求12所述的量子棒膜，其中所述数个配体包含有机磷、有机磷氧化物、有机磷酸、有机胺、有机羧酸、有机羧酸酯、烯烃、烷基硫醇、吡啶或其组合。
  14. 一种显示装置，其包含一显示面板、一背光模组，及设置于所述背光模组与所述显示面板之间的一第一量子棒膜；其中所述第一量子棒膜包含定向排列的数个第一量子棒，每一第一量子棒包含：
    一核芯，其由硫化镉组成；
    一壳层，其由硒化锌组成，包覆所述核芯；以及
    一棒状保护层，其由硫化锌组成，包覆所述核壳型量子点。
  15. 根据权利要求14所述的显示装置，其中第一量子棒的发射峰位可通过调整所述核芯的尺寸及所述壳层的厚度来调控。
  16. 根据权利要求14所述的显示装置，其中第一量子棒还包含一有机阻水层，包覆所述棒状保护层。
  17. 根据权利要求14所述的显示装置，其中第一量子棒还包含数个配体，键结于所述棒状保护层。
  18. 根据权利要求17所述的显示装置，其中所述数个配体包含有机磷、有机磷氧化物、有机磷酸、有机胺、有机羧酸、有机羧酸酯、烯烃、烷基硫醇、吡啶或其组合。
  19. 根据权利要求14所述的显示装置，其中所述显示面板为一液晶显示面板，其包含相对设置的第一基板与第二基板，以及设于第一基板与第二基板之间的液晶层；第一基板在从其朝向第二基板的方向上依序包含衬底、薄膜晶体管层及第二量子棒膜，第二量子棒膜包含定向排列的数个第二量子棒，以及第二量子棒与第一量子棒的结构相同。
  20. 根据权利要求14所述的显示装置，其中第一基板或第二基板包括一彩色滤光片，所述彩色滤光片包含数个绿色滤光单元、数个红色滤光单元及数个蓝色滤光单元，所述数个绿色滤光单元包含定向排列的数个第三量子棒，以及所述第三量子棒与第一量子棒的结构相同。
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