WO2022195614A1 - A vehicle glazing with quantum dot coated substrate - Google Patents

A vehicle glazing with quantum dot coated substrate Download PDF

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Publication number
WO2022195614A1
WO2022195614A1 PCT/IN2022/050240 IN2022050240W WO2022195614A1 WO 2022195614 A1 WO2022195614 A1 WO 2022195614A1 IN 2022050240 W IN2022050240 W IN 2022050240W WO 2022195614 A1 WO2022195614 A1 WO 2022195614A1
Authority
WO
WIPO (PCT)
Prior art keywords
quantum dot
substrate
layer
coating
vehicle glazing
Prior art date
Application number
PCT/IN2022/050240
Other languages
French (fr)
Inventor
Arunvel Thangamani
Samson Richardson D
Naveinah CHANDRASEKARAN
Original Assignee
Saint-Gobain Glass France
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Saint-Gobain Glass France filed Critical Saint-Gobain Glass France
Publication of WO2022195614A1 publication Critical patent/WO2022195614A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10009—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets
    • B32B17/10036—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets comprising two outer glass sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10165—Functional features of the laminated safety glass or glazing
    • B32B17/10174—Coatings of a metallic or dielectric material on a constituent layer of glass or polymer
    • B32B17/10238—Coatings of a metallic or dielectric material on a constituent layer of glass or polymer in the form of particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10165—Functional features of the laminated safety glass or glazing
    • B32B17/10541—Functional features of the laminated safety glass or glazing comprising a light source or a light guide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/1055—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer
    • B32B17/10761—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer containing vinyl acetal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/1055—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer
    • B32B17/10788—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer containing ethylene vinylacetate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
    • C03C17/34—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions
    • C03C17/3411—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions with at least two coatings of inorganic materials
    • C03C17/3429—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions with at least two coatings of inorganic materials at least one of the coatings being a non-oxide coating
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C23/00—Other surface treatment of glass not in the form of fibres or filaments
    • C03C23/0005—Other surface treatment of glass not in the form of fibres or filaments by irradiation
    • C03C23/005—Other surface treatment of glass not in the form of fibres or filaments by irradiation by atoms
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C27/00—Joining pieces of glass to pieces of other inorganic material; Joining glass to glass other than by fusing
    • C03C27/06—Joining glass to glass by processes other than fusing
    • C03C27/10—Joining glass to glass by processes other than fusing with the aid of adhesive specially adapted for that purpose
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
    • B32B2264/10—Inorganic particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
    • B32B2264/10—Inorganic particles
    • B32B2264/102—Oxide or hydroxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/412—Transparent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/414—Translucent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/416—Reflective
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/422—Luminescent, fluorescent, phosphorescent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2605/00—Vehicles
    • B32B2605/08—Cars

Definitions

  • the present invention relates to quantum dot coating on a glass substrate.
  • the present invention relates to quantum dot coated glass substrate, performing multiple functionalities.
  • the present invention relates to quantum dot coated glass substrate to be used in a vehicle glazing for performing multiple functionalities.
  • a vehicle body is covered with 40% of a glazing structure which permits light transmittance.
  • a glazing structure adds to combined practicality and aesthetic appeal.
  • the glazing structures are many-a-times coated with layers to attain different functionalities, but those at the same time, alter the transparency of the substrate on which the coating is done and thus resulting in poor visibility.
  • a see thorough glazing in a vehicle allows better visibility and a real appearance of an object at the other end of display from the viewer’s location.
  • Quantum dot coating defines a first non-excited state which, when exposed to certain excitation source, absorbs energy and moves from non-excited state to excited state.
  • the quantum dot coating gets excited at different wavelength of light from a source of light and generally serves to reflect the unwanted ultraviolet rays as well as infrared rays of sun, thereby protecting the travellers inside the automobile from its harmful effects.
  • coated glazing is commonly used in automobiles to prevent glare of sun and thereby render a comfortable ride and drive.
  • quantum dot coated glazing are also used in the prior art, they are often associated with some or the other disadvantages. Further known in the prior art are coatings which provides harmful emissions to the environment or even result in thicker substrate on which the coating is done.
  • thermos-colour intelligent dimming energy-saving glass and preparation method thereof discloses a kind of thermos-colour intelligent dimming energy-saving glass and preparation method thereof.
  • the prior art talks about Vanadium Oxide material which is not necessarily a one dimensional quantum dot, and also the said element causes phase change depending on the temperature and acts to change the state of material which restricts its application to a very narrow extent. Further, this also leads to the increased thickness of the substrate which is not desirable.
  • An object of the present invention is to provide a glass substrate having quantum dot coating.
  • Another object of the present invention is to provide quantum dot coating on both tempered as well as laminated glass substrates.
  • Another object of the present invention is to provide a glass substrate having quantum dot coating to enable power generation.
  • Yet another object of the present invention is to provide a glass substrate having quantum dot coating along with light emitting diode to enable wide colour gamut.
  • Still another object of the present invention is to provide a glass substrate having quantum dot coating to enable Auto Tint at various wavelength of Ultra Violet light depending on time of the day or angle of incidence of Ultra Violet light.
  • a further object of the present invention is to provide a glass substrate having quantum dot coating wherein the quantum dot coating thickness is variable to enable multiple functionalities at once.
  • a still further object of the present invention is to provide a vehicle which utilizes glass substrate having quantum dot coating to be used as a roof light, a backlight, a windscreen, a side window, a door window or an internal vehicle component.
  • a quantum dot coated substrate wherein a quantum dot is coated on face one of a first substrate and face three of a second substrate such that the quantum dot coating on first substrate and second substrate face in same direction.
  • a light emitting diode layer is also present up to l/3 rd of the area of face three of the second substrate layer.
  • the quantum dot coating is further sandwiched with conductive layers on both sides which enable convert unwanted light from a source of light to energy in aid with the conductive layer to be utilized for power generation with 10% efficiency.
  • a quantum dot coating applied on face two of the first substrate layer and in face three of the second substrate layer such that the quantum dot coating in the first substrate layer is in opposite direction as the quantum dot coating in the second substrate layer.
  • the quantum dot coating in face three of the second substrate layer reflects UV rays from the light source and the same is absorbed by the quantum dot coating on face two of the first substrate layer to obtain photoluminescence
  • a quantum dot coating applied on only one substrate layer such that the quantum dot coating is either in face one or face two of the first substrate layer or in face three or face four of second substrate layer.
  • the thickness of quantum dot coating varies in different parts of the substrate.
  • a part of the quantum dot coating is sandwiched between a conductive layer which helps generate power from the light from the light source with 10% efficiency.
  • a part of the quantum dot coating is used to reflect UV and IR rays from the light source and yet another part of the coating generates photoluminescence.
  • Another aspect of the present invention discloses quantum dot coating applied partly on only one substrate layer such that the quantum dot coating is either in face one or face two of the first substrate layer or in face three or face four of second substrate layer.
  • the quantum dot coating enables auto-tint of the substrate which helps enable photoluminescence.
  • the various aspects of the present invention provide a quantum dot coated substrate performing multiple functionalities along with a maintenance of bare minimum added thickness for the quantum dot coating on the substrate. At the same time, it also preserves the transparency or translucency of the substrate thus rendering clear visibility.
  • FIG 1 illustrates a glazing structure having quantum dot coating on each substrate and a light emitting diode integrated partly on a second substrate in accordance with an embodiment of the present invention.
  • FIG 2 illustrates a glazing structure having quantum dot coating on each substrate in accordance with an embodiment of the present invention.
  • FIG 3 illustrates a glazing structure having quantum dot coating of variable thickness on either of the substrate in accordance with an embodiment of the present invention.
  • FIG 4 illustrates a glazing structure having quantum dot coating coated on either of the substrate in accordance with an embodiment of the present invention.
  • substantially used in the present disclosure is used in order to avoid the mathematical rigidity of any characteristic, parameter, or value. This is meant to indicate that the corresponding characteristic, parameter, or value need not be achieved exactly, but that deviations or variations, including and not limited to for example, tolerances, measurement error, measurement accuracy limitations and other factors known to those of skill in the art, may occur in amounts that do not preclude the effect the characteristic was intended to provide.
  • transparent ’ or ‘ transparency ’ as mentioned in the invention refers to the optical property of allowing electromagnetic waves to pass through a material (e.g. a substrate) without being scattered.
  • translucency' or ‘ translucent as mentioned in the invention refers to the optical property of allowing electromagnetic waves to pass through a material while being scattered.
  • Translucent materials allow transmission of all or part of the electromagnetic waves, although said electromagnetic waves may be transmitted in a different direction to the incident radiation.
  • Translucent substrates for use may also reflect part of the electromagnetic waves.
  • quantum dots' as used herein may embrace semiconductor quantum dots, core-type quantum dots and or core-shell quantum dots.
  • the quantum dots in the present invention are one-dimensional quantum dots which have a tuneable band gap which can be altered depending on various functional requirements.
  • the present disclosure is directed to a quantum dot coated glazing structure to be used in automobiles.
  • the quantum dot coating is done such that it can reflect the harmful rays of sun, sun being the primary source of light that the glazing structure is majorly exposed to.
  • the quantum dot coating on a glass substrate in the glazing structure is used for illumination as well as energy source creation without adding another additional layer of material or increasing the thickness or weight of the glass which is essential.
  • the glass substrate can be transparent or translucent depending on the operational requirements and can also be a tinted glass substrate.
  • the glazing may be of tempered glass with one or two layer or a laminated glazing. In some of the embodiments, the glazing may be made of two layers of tempered glass bonded by a laser bonding.
  • the glazing is such that the consecutive glass substrates are attached to each other by one or multiple layers of interlayer.
  • the interlayer as in the present invention is made of polymer such as and not limited to Polyvinyl butyral or Ethylene-vinyl acetate and/or Polyethylene terephthalate or a combination thereof.
  • the substrate is made such that it is etched with laser etching of a minimum thickness of lOOnm with a varying pattern. It is further layered with a primer for better adhesion of the quantum dot coating.
  • the variable etching pattern also further results in variable surface energy for adhesion of quantum dot coating on the substrate.
  • the quantum dots for use in the invention may be excited or activated by any suitable energy source from a source of light.
  • the coated quantum dots or quantum dot coating herein define a first non-ex cited state and a second excited state, wherein the quantum dots move or shift from the non-excited state to the excited state upon exposure to a source of light of certain wavelength which, in accordance with the present invention, varies from at least 205nm-lmm.
  • the quantum dots for use in the invention are one dimensional and comprise metal oxide components which range to a maximum thickness of 500microns. In some embodiments, it is also formed of semiconductor particles. It also does not have toxic elements as found in maximum quantum dot coatings namely cadmium, lead, mercury etc.
  • Quantum dot coatings can be made transparent, flexible and can be processed easily through normal printing process like slot die print, spin coating, inkjet printing, screen printing or roll on coating or other deposition techniques.
  • Various band gap of the quantum dot particles can be used by fabricating the quantum dot coating of different sizes. Due to variable band energy the quantum dot coatings can be used for capturing wide spectrum range of visible light, which thereby can be used for multiple functionalities.
  • the quantum dot coating mentioned in the present invention is the active layer capturing the solar spectrum from the source of light and converts them to energy.
  • the basic requirement of using a quantum dot coated substrate is to obtain multiple functionalities at any given point of time which can be attained at a wide range of wavelength of light from a light source.
  • the complexity in making a quantum dot coated substrate lies majorly in the fact of resulting in thickness of the substrate due to the coating done, or decreased transparency and thereby visibility, or quantum dot activation for a very small wavelength of light. This has been detailed in the prior art section of the present disclosure.
  • the embodiment one (1000) of the present invention depicts a glazing structure having a first substrate (130) attached to a second substrate (140) by an interlayer (160).
  • the substrate is a glass substrate has a maximum thickness of 0.5 mm. Further, each substrate may be of similar or different thickness and can have similar or varying optical properties.
  • the first substrate (130) has first surface (170) and second surface (180) and similarly, the second substrate (140) has a third surface (190) and a fourth surface (195).
  • the quantum dot coating (110) is done on the first surface (170) of the first substrate (130) as well as on the third surface (190) of the second substrate (140).
  • the quantum dot coating can be done is second face (180) of first substrate and fourth face (195) of the second substrate (140) and the coating is always done in a humidity controlled environment.
  • the quantum dot coating (110 or 120) is done such that there is no substantial change is transparency or translucency of the substrate (130 or 140). Also, the quantum dot coating (110 or 120) is such that the coating does not substantially increase the thickness of the substrate (130 or 140) and the quantum dot coating (110 or 120) is the maintained at a maximum thickness of 500microns.
  • the quantum dot coatings are done such that they are sandwiched between conductive layers (115a or 115b). Thus, conductive layers (115a) sandwiches quantum dot coating (110) as on the first surface (170) of the first substrate (130) and conductive layers (115b) sandwiches quantum dot coating (120) as on the third surface (190) of the second substrate (140).
  • the layer of light emitting diode (150) is such that it covers l/3 rd of the area of the second substrate (140).
  • the reflected rays constitute ultraviolet and infrared rays from the source of light (100).
  • the remaining incident light (10) is utilized by the quantum dot coatings (110 and 120) to generate power in aid with the conductive layers (115a and 115b) which facilitate power flow.
  • the quantum dot coatings (110 and 120) layer is sandwiched between an electron transport layer (120a) and a hole transport layer (120b).
  • the electron transport layer (120a) along with the conductive layer (115a or 115b) helps form a circuit.
  • the incident rays (10) on the quantum dot coating (110 or 120) results in multiple exciton generation which in turn results in AC/DC power generation.
  • the electron transport layer (120a) and a hole transport layer (120b) can be formed of metal oxides like titanium oxide or zinc oxide or tin oxide. This power generated is utilized as a power source for the light emitting diode (150) as a part of light emitting diode in backlight of a vehicle as well as to power other components of the vehicle. Power generation through the quantum dot coating (110 and 120) can vary from 0.5picoWatt to maximum of 1 Watt.
  • the method of power generating is similar to the way power is generated in a solar cell, but in case of quantum dot coating, the efficiency of power generation is much higher as compared to solar cells.
  • the quantum dot coating (110 or 120) so coated on the first substrate (130) or the second substrate (140) thus can perform all the above mentioned functionalities ranging from power generation for the light emitting diode (150) to reflecting ultraviolet or infrared rays (20) for the wavelength of incident light (10) whose wavelength ranges from 250nm to 1mm.
  • FIG 2 discloses a second embodiment (2000) in accordance with the present invention.
  • the glazing structure in the present embodiment has one variant with two tempered glass having a first substrate (130) bonded to a second substrate (140) by laser bonding (not shown in figure).
  • it is a laminated glazing a first substrate (130) and a second substrate (140) which is attached to each other by single or multiple layers of interlayer (160).
  • the quantum dot coating (110) is such that it is coated on the second surface (180) of the first substrate (130) and the third surface (190) of the second substrate (140). It is such that the quantum dot coating (130 and 140) face each other towards the interlayer (160).
  • the first substrate (130) and the second substrate (140) can have same or different thickness which can have a maximum value of 0.5 mm as well as can have same or different optical properties.
  • a part of the incident light (10) from the source of light (100) passes through the glazing structure in the form of visible light (10a).
  • Yet another part of the incident light (10) which majorly constitutes ultraviolet light gets reflected (30) from the quantum dot coating (120) on the third surface (190) of the second substrate (140) and is utilized by the quantum dot coating (110) on the second surface (180) of the first substrate (130) to generate photoluminescence effect.
  • the effect of photoluminescence is used for the purpose of generating of any form of display inside the vehicle.
  • Photoluminescence is the emission of light (electromagnetic radiation, photons) after the absorption of light. It is one form of luminescence property (light emission) and is initiated by photoexcitation (excitation by photons). Following photon excitation, various charge relaxation processes can occur in which other photons with a lower energy are re-radiated on some time scale.
  • the energy difference between the absorbed photons and the emitted photons, also known as Stokes shift, can vary widely across materials from nearly 0 to 1 eV or more.
  • the quantum dot coating (110 and 120) in the present invention is capable of generating stable and efficient photoluminescence effect.
  • FIG 3 of the present invention discloses a third embodiment (3000) in accordance with the present invention.
  • the glazing in this embodiment can be of tempered glass or laminated glazing.
  • the glazing structure in the present embodiment is such that the quantum dot coating (110a, 110b and 110c) is either on face two (180) of the first substrate or on face three (190) of the second substrate.
  • the quantum dot coating (110a, 110b and 110c) in the present embodiment has variable thickness and can further also have variable metal composition as well as variable size.
  • the quantum dot coating (110a, 110b and 110c) in another embodiment is different from each other based on functionality requirement.
  • the thickness of the quantum dot coating (110a, 110b and 110c) varies from a minimum of lOOmicrons to lnm.
  • the spread of the variable thickness quantum dot coating (110a, 110b and 110c) generally covers l/3 rd of the substrate each and each part performs significantly different functionalities in lieu with their variable thickness.
  • the first part of the quantum dot coating (110a) is integrated such that it reflects the unwanted light from the incident light (10) which is directed from the source of light (100) in the form of reflected rays (20).
  • the unwanted light majorly constitutes ultraviolet rays or infrared radiations.
  • a part of incident light (10) passes through the glazing structure in the form of visible light (10a).
  • the next part of the quantum dot coating (110b) is sandwiched between conductive layers (115). This portion of the quantum dot coating (110b) helps generate power in aid with the conductive layers (115).
  • the quantum dot coatings (110 and 120) layer is sandwiched between an electron transport layer (120a) and a hole transport layer (120b), which, along with the conductive layer (115a or 115b) helps form a circuit which in turn results in AC/DC power generation. This power generated is utilized to power up multiple electronic components in the vehicle. Yet another part of the quantum dot coating (110c) helps generate photoluminescence.
  • the quantum dots being typically small in size, typically less than 20nm, are capable of generating photoluminescence over a wide range of colours, a strong and broadband absorption, and a remarkably high photoluminescence efficiency. The size of the quantum dots can be varied depending on the requirement, which in turn will vary the photoluminescence effect.
  • FIG 4 of the present invention discloses a fourth embodiment (4000) in accordance with the present invention.
  • the glazing structure in the present embodiment is such that the quantum dot coating (110) is present only partly over a substrate (130).
  • the quantum dot coating (110) is present over l/3 rd of the area of the substrate (130).
  • the quantum dot coating (110) is such that it can be present on either face one (170) or face two (180) of the first substrate (130) or on face three (190) or face four (195) of the second substrate (140).
  • the substrates (130 and 140) in the present embodiment may be of similar or variable thickness and with similar or different material composition.
  • the incident rays (10) from the source of light (100) passes through the glazing structure in the form of a visible light (10a).
  • the quantum dot coating (110) in the present embodiment enables auto tinting of the substrate (130 or 140) on which the coating is done and that further enables photoluminescence.
  • the auto tinting feature helps protect the riders inside the vehicle from the glare of sun and also enables a smooth and comfortable drive.
  • the different embodiments of the present invention can be utilized as glazing whereby the glazing is a roof light, a backlight, a windscreen, a side window, a door window or an internal vehicle component depending on the requirements and necessary usage.
  • the quantum dot coating on the substrate being a very thin layer does not result in increased thickness of the substrate with the coating on it.
  • the quantum dot coating in the present invention gets activated to a wide wavelength of light from a light source, thereby resulting different functionalities.
  • Multilayer thickness of the quantum dot coating enables additional functionalities like auto tint and infrared rays reflection with the same process without the need of additional interlayer or process change.

Abstract

The present disclosure provides a quantum dot coated glass substrate to be used in a vehicle glazing to attain varied functionalities. The quantum dot coating (110 or 120) is applied on to at least one of a substrate layer (130 or 140) of a vehicle glazing and that gets excited by an incident ray (10) from a source of light (100) having wavelength ranging from at least 205nm-1mm. The quantum dot coating (110 or 120) can reflect UV/IR light from the light source (100), it can also convert unwanted light from the light source (100) to energy in aid with the conductive layer (115a and 115b) to be utilized for power generation. The quantum dot coating (110 or 120) further can also generate auto-tinting that further enables photoluminescence of substrate layer (130 or 140).

Description

A vehicle glazing with quantum dot coated substrate
FIELD OF TECHNOLOGY
The present invention relates to quantum dot coating on a glass substrate. Particularly, the present invention relates to quantum dot coated glass substrate, performing multiple functionalities. More particularly, the present invention relates to quantum dot coated glass substrate to be used in a vehicle glazing for performing multiple functionalities.
BACKGROUND
Background description includes information that may be useful in understanding the present disclosure. It is not an admission that any of the information provided herein is prior art or relevant to the presently claimed disclosure, or that any publication specifically or implicitly referenced is prior art.
Conventionally, a vehicle body is covered with 40% of a glazing structure which permits light transmittance. Such glazing structure adds to combined practicality and aesthetic appeal. The glazing structures are many-a-times coated with layers to attain different functionalities, but those at the same time, alter the transparency of the substrate on which the coating is done and thus resulting in poor visibility. A see thorough glazing in a vehicle allows better visibility and a real appearance of an object at the other end of display from the viewer’s location.
In the recent years, the use of quantum dot coated glass substrate has got increased popularity because of the wide range of functionalities that can be attained from it as well as the fact that it maintains the see through effect of the glazing substrate. Quantum dot coating defines a first non-excited state which, when exposed to certain excitation source, absorbs energy and moves from non-excited state to excited state. The quantum dot coating gets excited at different wavelength of light from a source of light and generally serves to reflect the unwanted ultraviolet rays as well as infrared rays of sun, thereby protecting the travellers inside the automobile from its harmful effects. Thus, coated glazing is commonly used in automobiles to prevent glare of sun and thereby render a comfortable ride and drive. Although quantum dot coated glazing are also used in the prior art, they are often associated with some or the other disadvantages. Further known in the prior art are coatings which provides harmful emissions to the environment or even result in thicker substrate on which the coating is done.
Reference is made to US20170341346A1 that discloses a laminated glass luminescent concentrator which talks about a laminated glass luminescent concentrator which includes a solid medium having a plurality of fluorophores disposed therein. In some embodiments of the prior art, the fluorophore is a low-toxicity quantum dot. Also, the prior art is only capable of generation of electricity which is the sole outcome.
Another reference is made to US20200055283A1 which discloses a transparent display that talks about a substrate coated with quantum dot which does not alter the transparency or translucency of the substrate and maintains the visibility. But, in the given prior art, the quantum dots get excited and function only over a very narrow range of wavelength of light which might not be the wavelength that it is frequently exposed to or even might be an undesirable wavelength range which is harmful for the riders of the vehicle.
Yet another reference is made to CN106150290A which discloses a kind of thermos-colour intelligent dimming energy-saving glass and preparation method thereof. The prior art talks about Vanadium Oxide material which is not necessarily a one dimensional quantum dot, and also the said element causes phase change depending on the temperature and acts to change the state of material which restricts its application to a very narrow extent. Further, this also leads to the increased thickness of the substrate which is not desirable.
Thus, it is observed that the quantum dot coatings as present in the prior arts have several shortcomings and limited applicability.
Even though some of the solutions are directed at attaining certain functionalities like generation of electricity or reflection of harmful rays from the sun, the narrow applicability range does not make them an easy fit in the industry. Further, it is seen that the quantum dot coatings in the prior art are found to increase the substrate thickness, which interferes with the overall vehicle performance. The increased thickness of the quantum dot coating result in an increased air gap between the glazing substrates and thus resulting in a tendency of cracks in the substrate. Further it also results in increased weight and decreased fuel efficiency with and increasing cost. Thus, an optimised thickness of quantum dot coating is desirable.
In the light of the prior art discussed hitherto, there is a need of a simple automotive glazing component which has transparent substrate with coating on the substrate to enable multiple functionalities. The coating also needs to be such that there is not any considerable increase in thickness to the substrate along with the coating to enable the desired functionalities.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a glass substrate having quantum dot coating.
Another object of the present invention is to provide quantum dot coating on both tempered as well as laminated glass substrates.
Additionally, another object of the present invention is to provide a glass substrate having quantum dot coating to enable power generation.
Yet another object of the present invention is to provide a glass substrate having quantum dot coating along with light emitting diode to enable wide colour gamut.
Still another object of the present invention is to provide a glass substrate having quantum dot coating to enable Auto Tint at various wavelength of Ultra Violet light depending on time of the day or angle of incidence of Ultra Violet light.
A further object of the present invention is to provide a glass substrate having quantum dot coating wherein the quantum dot coating thickness is variable to enable multiple functionalities at once.
A still further object of the present invention is to provide a vehicle which utilizes glass substrate having quantum dot coating to be used as a roof light, a backlight, a windscreen, a side window, a door window or an internal vehicle component. These and other objects of the invention are achieved by the following aspects of the invention. The following disclosure presents a simplified summary of the invention in order to provide a basic understanding of some aspects of the invention. This presents some concept of the invention in a simplified form to a more detailed description of the invention presented later. It is a comprehensive summary of the disclosure and it is not an extensive overview of the present invention. The intend of this summary is to provide a fundamental understanding of some of the aspects of the present invention.
In an aspect of the present invention is disclosed a quantum dot coated substrate wherein a quantum dot is coated on face one of a first substrate and face three of a second substrate such that the quantum dot coating on first substrate and second substrate face in same direction. A light emitting diode layer is also present up to l/3rd of the area of face three of the second substrate layer. The quantum dot coating is further sandwiched with conductive layers on both sides which enable convert unwanted light from a source of light to energy in aid with the conductive layer to be utilized for power generation with 10% efficiency.
In another aspect of the present invention is disclosed a quantum dot coating applied on face two of the first substrate layer and in face three of the second substrate layer such that the quantum dot coating in the first substrate layer is in opposite direction as the quantum dot coating in the second substrate layer. In this arrangement the quantum dot coating in face three of the second substrate layer reflects UV rays from the light source and the same is absorbed by the quantum dot coating on face two of the first substrate layer to obtain photoluminescence
In yet another aspect of the present invention is disclosed a quantum dot coating applied on only one substrate layer such that the quantum dot coating is either in face one or face two of the first substrate layer or in face three or face four of second substrate layer. Here, the thickness of quantum dot coating varies in different parts of the substrate. A part of the quantum dot coating is sandwiched between a conductive layer which helps generate power from the light from the light source with 10% efficiency. A part of the quantum dot coating is used to reflect UV and IR rays from the light source and yet another part of the coating generates photoluminescence. Another aspect of the present invention discloses quantum dot coating applied partly on only one substrate layer such that the quantum dot coating is either in face one or face two of the first substrate layer or in face three or face four of second substrate layer. The quantum dot coating enables auto-tint of the substrate which helps enable photoluminescence.
The various aspects of the present invention provide a quantum dot coated substrate performing multiple functionalities along with a maintenance of bare minimum added thickness for the quantum dot coating on the substrate. At the same time, it also preserves the transparency or translucency of the substrate thus rendering clear visibility.
The significant features of the present invention and the advantages of the same will be apparent to a person skilled in the art from the detailed description that follows in conjunction with the annexed drawings.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
The following briefly describes the accompanying drawings, illustrating the technical solution of the embodiments of the present invention or the prior art, for assisting the understanding of a person skilled in the art to comprehend the invention. It would be apparent that the accompanying drawings in the following description merely show some embodiments of the present invention, and persons skilled in the art can derive other drawings from the accompanying drawings without deviating from the scope of the disclosure.
FIG 1 illustrates a glazing structure having quantum dot coating on each substrate and a light emitting diode integrated partly on a second substrate in accordance with an embodiment of the present invention.
FIG 2 illustrates a glazing structure having quantum dot coating on each substrate in accordance with an embodiment of the present invention.
FIG 3 illustrates a glazing structure having quantum dot coating of variable thickness on either of the substrate in accordance with an embodiment of the present invention. FIG 4 illustrates a glazing structure having quantum dot coating coated on either of the substrate in accordance with an embodiment of the present invention.
Persons skilled in the art will appreciate that elements in the figures are illustrated for simplicity and clarity and have not necessarily been drawn to scale. For example, the dimensions of some of the elements in the figures may be exaggerated relative to other elements to help to improve understanding of embodiments of the disclosure.
DETAILED DESCRIPTION OF THE INVENTION
The present disclosure is now discussed in more detail referring to the drawings that accompany the present application. It would be appreciated by a skilled person that this description to assist the understanding of the invention but these are to be regarded as merely exemplary.
Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments and/or in combination with or instead of the features of the other embodiments.
The terms and words used in the following description are not limited to the bibliographical meanings and the same are used to enable a clear and consistent understanding of the invention. Accordingly, the terms/phrases are to be read in the context of the disclosure and not in isolation. Additionally, descriptions of well-known functions and constructions are omitted for clarity and conciseness.
The term ‘ substantially used in the present disclosure is used in order to avoid the mathematical rigidity of any characteristic, parameter, or value. This is meant to indicate that the corresponding characteristic, parameter, or value need not be achieved exactly, but that deviations or variations, including and not limited to for example, tolerances, measurement error, measurement accuracy limitations and other factors known to those of skill in the art, may occur in amounts that do not preclude the effect the characteristic was intended to provide. One of skill will appreciate that the term ‘ transparent ’ or ‘ transparency ’ as mentioned in the invention refers to the optical property of allowing electromagnetic waves to pass through a material (e.g. a substrate) without being scattered.
The term ‘ translucency' or ‘ translucent as mentioned in the invention refers to the optical property of allowing electromagnetic waves to pass through a material while being scattered. Translucent materials allow transmission of all or part of the electromagnetic waves, although said electromagnetic waves may be transmitted in a different direction to the incident radiation. Translucent substrates for use may also reflect part of the electromagnetic waves.
The term ‘ quantum dots' as used herein may embrace semiconductor quantum dots, core-type quantum dots and or core-shell quantum dots. The quantum dots in the present invention are one-dimensional quantum dots which have a tuneable band gap which can be altered depending on various functional requirements.
The present disclosure is directed to a quantum dot coated glazing structure to be used in automobiles. The quantum dot coating is done such that it can reflect the harmful rays of sun, sun being the primary source of light that the glazing structure is majorly exposed to. The quantum dot coating on a glass substrate in the glazing structure is used for illumination as well as energy source creation without adding another additional layer of material or increasing the thickness or weight of the glass which is essential. The glass substrate can be transparent or translucent depending on the operational requirements and can also be a tinted glass substrate. The glazing may be of tempered glass with one or two layer or a laminated glazing. In some of the embodiments, the glazing may be made of two layers of tempered glass bonded by a laser bonding. In cases of laminated glazing, the glazing is such that the consecutive glass substrates are attached to each other by one or multiple layers of interlayer. The interlayer as in the present invention is made of polymer such as and not limited to Polyvinyl butyral or Ethylene-vinyl acetate and/or Polyethylene terephthalate or a combination thereof.
The substrate is made such that it is etched with laser etching of a minimum thickness of lOOnm with a varying pattern. It is further layered with a primer for better adhesion of the quantum dot coating. The variable etching pattern also further results in variable surface energy for adhesion of quantum dot coating on the substrate. The quantum dots for use in the invention may be excited or activated by any suitable energy source from a source of light. The coated quantum dots or quantum dot coating herein define a first non-ex cited state and a second excited state, wherein the quantum dots move or shift from the non-excited state to the excited state upon exposure to a source of light of certain wavelength which, in accordance with the present invention, varies from at least 205nm-lmm. Further, the quantum dots for use in the invention are one dimensional and comprise metal oxide components which range to a maximum thickness of 500microns. In some embodiments, it is also formed of semiconductor particles. It also does not have toxic elements as found in maximum quantum dot coatings namely cadmium, lead, mercury etc.
Quantum dot coatings can be made transparent, flexible and can be processed easily through normal printing process like slot die print, spin coating, inkjet printing, screen printing or roll on coating or other deposition techniques. Various band gap of the quantum dot particles can be used by fabricating the quantum dot coating of different sizes. Due to variable band energy the quantum dot coatings can be used for capturing wide spectrum range of visible light, which thereby can be used for multiple functionalities. The quantum dot coating mentioned in the present invention is the active layer capturing the solar spectrum from the source of light and converts them to energy.
The basic requirement of using a quantum dot coated substrate is to obtain multiple functionalities at any given point of time which can be attained at a wide range of wavelength of light from a light source. The complexity in making a quantum dot coated substrate lies majorly in the fact of resulting in thickness of the substrate due to the coating done, or decreased transparency and thereby visibility, or quantum dot activation for a very small wavelength of light. This has been detailed in the prior art section of the present disclosure.
Accordingly, in an embodiment of the present invention is disclosed a quantum dot coated substrate as in FIG 1 in accordance with the present invention. The embodiment one (1000) of the present invention depicts a glazing structure having a first substrate (130) attached to a second substrate (140) by an interlayer (160). The substrate is a glass substrate has a maximum thickness of 0.5 mm. Further, each substrate may be of similar or different thickness and can have similar or varying optical properties. The first substrate (130) has first surface (170) and second surface (180) and similarly, the second substrate (140) has a third surface (190) and a fourth surface (195). The quantum dot coating (110) is done on the first surface (170) of the first substrate (130) as well as on the third surface (190) of the second substrate (140). In some other embodiment, the quantum dot coating can be done is second face (180) of first substrate and fourth face (195) of the second substrate (140) and the coating is always done in a humidity controlled environment.
Further, the quantum dot coating (110 or 120) is done such that there is no substantial change is transparency or translucency of the substrate (130 or 140). Also, the quantum dot coating (110 or 120) is such that the coating does not substantially increase the thickness of the substrate (130 or 140) and the quantum dot coating (110 or 120) is the maintained at a maximum thickness of 500microns. The quantum dot coatings are done such that they are sandwiched between conductive layers (115a or 115b). Thus, conductive layers (115a) sandwiches quantum dot coating (110) as on the first surface (170) of the first substrate (130) and conductive layers (115b) sandwiches quantum dot coating (120) as on the third surface (190) of the second substrate (140). There is a layer of light emitting diode (150) integrated on the third surface (190) of the second substrate (140) such that the light emitting diode (150) is placed adjacent to the conductive layer (115b). The layer of light emitting diode (150) is such that it covers l/3rd of the area of the second substrate (140).
A part of incident rays (10) from a source of light (100) gets absorbed and passes through the glazing structure and thereby gets converted into visible rays (10a), and yet another part of the incident rays are reflected as reflected rays (20) by the quantum dot coated substrate. The reflected rays constitute ultraviolet and infrared rays from the source of light (100). The remaining incident light (10) is utilized by the quantum dot coatings (110 and 120) to generate power in aid with the conductive layers (115a and 115b) which facilitate power flow. In this embodiment, the quantum dot coatings (110 and 120) layer is sandwiched between an electron transport layer (120a) and a hole transport layer (120b). The electron transport layer (120a) along with the conductive layer (115a or 115b) helps form a circuit. The incident rays (10) on the quantum dot coating (110 or 120) results in multiple exciton generation which in turn results in AC/DC power generation. The electron transport layer (120a) and a hole transport layer (120b) can be formed of metal oxides like titanium oxide or zinc oxide or tin oxide. This power generated is utilized as a power source for the light emitting diode (150) as a part of light emitting diode in backlight of a vehicle as well as to power other components of the vehicle. Power generation through the quantum dot coating (110 and 120) can vary from 0.5picoWatt to maximum of 1 Watt. The method of power generating is similar to the way power is generated in a solar cell, but in case of quantum dot coating, the efficiency of power generation is much higher as compared to solar cells. The quantum dot coating (110 or 120) so coated on the first substrate (130) or the second substrate (140) thus can perform all the above mentioned functionalities ranging from power generation for the light emitting diode (150) to reflecting ultraviolet or infrared rays (20) for the wavelength of incident light (10) whose wavelength ranges from 250nm to 1mm.
FIG 2 discloses a second embodiment (2000) in accordance with the present invention. The glazing structure in the present embodiment has one variant with two tempered glass having a first substrate (130) bonded to a second substrate (140) by laser bonding (not shown in figure). In yet another variant, it is a laminated glazing a first substrate (130) and a second substrate (140) which is attached to each other by single or multiple layers of interlayer (160). The quantum dot coating (110) is such that it is coated on the second surface (180) of the first substrate (130) and the third surface (190) of the second substrate (140). It is such that the quantum dot coating (130 and 140) face each other towards the interlayer (160). The first substrate (130) and the second substrate (140) can have same or different thickness which can have a maximum value of 0.5 mm as well as can have same or different optical properties. A part of the incident light (10) from the source of light (100) passes through the glazing structure in the form of visible light (10a). Yet another part of the incident light (10) which majorly constitutes ultraviolet light gets reflected (30) from the quantum dot coating (120) on the third surface (190) of the second substrate (140) and is utilized by the quantum dot coating (110) on the second surface (180) of the first substrate (130) to generate photoluminescence effect. The effect of photoluminescence is used for the purpose of generating of any form of display inside the vehicle.
Photoluminescence is the emission of light (electromagnetic radiation, photons) after the absorption of light. It is one form of luminescence property (light emission) and is initiated by photoexcitation (excitation by photons). Following photon excitation, various charge relaxation processes can occur in which other photons with a lower energy are re-radiated on some time scale. The energy difference between the absorbed photons and the emitted photons, also known as Stokes shift, can vary widely across materials from nearly 0 to 1 eV or more. The quantum dot coating (110 and 120) in the present invention is capable of generating stable and efficient photoluminescence effect. Photoluminescence value thus generated range from 5Cd/m2 - 900 cd/m2 and up-to 30,000cd/m2. FIG 3 of the present invention discloses a third embodiment (3000) in accordance with the present invention. The glazing in this embodiment can be of tempered glass or laminated glazing. The glazing structure in the present embodiment is such that the quantum dot coating (110a, 110b and 110c) is either on face two (180) of the first substrate or on face three (190) of the second substrate. The quantum dot coating (110a, 110b and 110c) in the present embodiment has variable thickness and can further also have variable metal composition as well as variable size. Further, the quantum dot coating (110a, 110b and 110c) in another embodiment is different from each other based on functionality requirement. The thickness of the quantum dot coating (110a, 110b and 110c) varies from a minimum of lOOmicrons to lnm. The spread of the variable thickness quantum dot coating (110a, 110b and 110c) generally covers l/3rd of the substrate each and each part performs significantly different functionalities in lieu with their variable thickness.
The first part of the quantum dot coating (110a) is integrated such that it reflects the unwanted light from the incident light (10) which is directed from the source of light (100) in the form of reflected rays (20). The unwanted light majorly constitutes ultraviolet rays or infrared radiations. A part of incident light (10) passes through the glazing structure in the form of visible light (10a). The next part of the quantum dot coating (110b) is sandwiched between conductive layers (115). This portion of the quantum dot coating (110b) helps generate power in aid with the conductive layers (115). In this embodiment again, like the first embodiment, the quantum dot coatings (110 and 120) layer is sandwiched between an electron transport layer (120a) and a hole transport layer (120b), which, along with the conductive layer (115a or 115b) helps form a circuit which in turn results in AC/DC power generation. This power generated is utilized to power up multiple electronic components in the vehicle. Yet another part of the quantum dot coating (110c) helps generate photoluminescence. The quantum dots being typically small in size, typically less than 20nm, are capable of generating photoluminescence over a wide range of colours, a strong and broadband absorption, and a remarkably high photoluminescence efficiency. The size of the quantum dots can be varied depending on the requirement, which in turn will vary the photoluminescence effect. Thus, a variable thickness of the quantum dot coating (110a, 110b, 110c) enable multiple functionalities at a given point of time which can have a wide range of application. FIG 4 of the present invention discloses a fourth embodiment (4000) in accordance with the present invention. The glazing structure in the present embodiment is such that the quantum dot coating (110) is present only partly over a substrate (130). To be specific, the quantum dot coating (110) is present over l/3rd of the area of the substrate (130). Further, the quantum dot coating (110) is such that it can be present on either face one (170) or face two (180) of the first substrate (130) or on face three (190) or face four (195) of the second substrate (140). The substrates (130 and 140) in the present embodiment may be of similar or variable thickness and with similar or different material composition. The incident rays (10) from the source of light (100) passes through the glazing structure in the form of a visible light (10a). The quantum dot coating (110) in the present embodiment enables auto tinting of the substrate (130 or 140) on which the coating is done and that further enables photoluminescence. The auto tinting feature helps protect the riders inside the vehicle from the glare of sun and also enables a smooth and comfortable drive.
Thus, the different embodiments of the present invention can be utilized as glazing whereby the glazing is a roof light, a backlight, a windscreen, a side window, a door window or an internal vehicle component depending on the requirements and necessary usage.
Some of the advantages of the present invention are:
• The quantum dot coating on the substrate being a very thin layer does not result in increased thickness of the substrate with the coating on it.
• The quantum dot coating in the present invention gets activated to a wide wavelength of light from a light source, thereby resulting different functionalities.
• Ultraviolet and Infrared Rays are reused for various functionalities by the quantum dot coating so described in the invention.
• Using the photovoltaic capabilities of quantum dot coating helps enable generate both AC/DC power for light emitting diode.
• Multilayer thickness of the quantum dot coating enables additional functionalities like auto tint and infrared rays reflection with the same process without the need of additional interlayer or process change. REFERENCE NUMERALS
List of reference numerals appearing in the accompanying drawings and the corresponding features:
10: Incident Rays 10a: Visible Light 20, 30: Reflected Rays 100: Source of Light
110, 110a, 110b, 110c, 120: Quantum Dot Coating
120a: Electron Transport Layer
120b: Hole Transport Layer
115, 115a, 115b: Conductive Layer
130: First Substrate
140: Second Substrate
150: Light Emitting Diode
160: Interlayer
170: Face One of First Substrate 180: Face Two of First Substrate 190: Face Three of Second Substrate 195: Face Four of Second Substrate 1000: Embodiment One 2000: Embodiment Two 3000: Embodiment Three 4000: Embodiment Four

Claims

CLAIMS We Claim:
1. A vehicle glazing with quantum dot coated substrate, comprising: at least one substrate layer (130 or 140), the substrate layer being transparent or translucent, a quantum dot coating (110 or 120) applied on to at least one of the substrate layer (130 or 140), an exposed part of the substrate layer (130) exposed to a source of light (100) acting as an excitation source, wherein, the source of light (100) has incident rays (10) of light of wavelength ranging from at least 205nm-lmm.
2. The vehicle glazing with quantum dot coated substrate as claimed in claim 1, wherein the quantum dots comprise metal oxide components or semiconductor particles.
3. The vehicle glazing with quantum dot coated substrate as claimed in claim 1, wherein the thickness of quantum dot coating is at max 500 micron.
4. The vehicle glazing with quantum dot coated substrate as claimed in claim 1, wherein, the substrate layer (130 or 140) is made of tempered glass or laminated glass.
5. The vehicle glazing with quantum dot coated substrate as claimed in claim 1, wherein, at least one of the substrate layer (130 or 140) is at least 0.5 mm thick.
6. The vehicle glazing with quantum dot coated substrate as claimed in claim 1, wherein, the material and the thickness of a first substrate layer (130) may not be similar to that of a second substrate layer (140).
7. The vehicle glazing with quantum dot coated substrate as claimed in claim 6, wherein, for laminated glass, the first substrate layer (130) is attached to the second substrate layer (140) by at least one interlayer (160).
8. The vehicle glazing with quantum dot coated substrate as claimed in claim 6, wherein, the first substrate layer (130) is attached to the second substrate layer (140) by multiple layers of interlayer (160).
9. The vehicle glazing with quantum dot coated substrate as claimed in claim 8, wherein, the interlayer (160) is made of polymer, the polymer specifically being Polyvinyl butyral or Ethylene-vinyl acetate or Polyethylene terephthalate.
10. The vehicle glazing with quantum dot coated substrate as claimed in claim 8, wherein, for multiple layer of interlayer (160), the consecutive interlayers can be made of polymer of similar or different composition.
11. The vehicle glazing with quantum dot coated substrate as claimed in claim 1, wherein, the quantum dot coating (110) is applied on face one (170) or face two (180) of the first substrate (130) and the quantum dot coating (120) is applied in face three (190) or face four (195) of the second substrate (140) such that the quantum dot coating (110) layer of the first substrate (130) is in same direction as the quantum dot coating (120) layer of the second substrate (140).
12. The vehicle glazing with quantum dot coated substrate as claimed in claim 11, wherein, the quantum dot coating (110 and 120) in the substrate layer (130 and 140) is is sandwiched between an electron transport layer (120a) and a hole transport layer (120b) which further is sandwiched by a conductive layer (115a and 115b).
13. The vehicle glazing with quantum dot coated substrate as claimed in claim 11, wherein, a LED layer (150) is present up to 1/3^ of the area of the second substrate layer (140) in face three (190) of the second substrate layer (140).
14. The vehicle glazing with quantum dot coated substrate as claimed in claim 12, wherein the quantum dot coating converts unwanted light from the light source (100) to energy in aid with the conductive layer (115a and 115b) to be utilized for power generation.
15. The vehicle glazing with quantum dot coated substrate as claimed in claim 1, wherein, the quantum dot coating (110) is applied on face two (180) of the first substrate layer (130) and the quantum dot coating (120) is applied in face three (190) of the second substrate layer (140) such that the quantum dot coating (110) layer in the first substrate layer (130) is in opposite direction as the quantum dot coating (120) layer in the second substrate layer (140).
16. The vehicle glazing with quantum dot coated substrate as claimed in claim 15, wherein the quantum dot coating (110) in face three (190) of the second substrate layer (140) reflects UV rays from the light source (100) and the same is absorbed by the quantum dot coating (120) on face two (180) of the first substrate layer (110) to obtain photoluminescence.
17. The vehicle glazing with quantum dot coated substrate as claimed in claim 1, wherein, quantum dot coating is applied on only one substrate layer such that the quantum dot coating is either in face one (170) or face two (180) of the first substrate layer (130) or in face three (190) or face four (195) of second substrate layer (140).
18. The vehicle glazing with quantum dot coated substrate as claimed in claim 17, wherein the thickness of quantum dot coatings (110a, 110b and 110c) applied on at least a part of the substrate (130 or 140) are different from each other based on functional requirement and varies between 100 microns to 1mm.
19. The vehicle glazing with quantum dot coated substrate as claimed in claim 17, wherein the material composition of quantum dot coating applied on at least a part of the substrate (130 or 140) varies.
20. The vehicle glazing with quantum dot coated substrate as claimed in claim 17, wherein a part of the quantum dot coating (110b) is sandwiched between an electron transport layer (120a) and a hole transport layer (120b) which further is sandwiched by a conductive layer (115a and 115b).
21. The vehicle glazing with quantum dot coated substrate as claimed in claim 17, wherein the quantum dot coating is such that a part of the quantum dot coating reflects UV and IR rays from the light source (100), another part of quantum dot coating generates power in aid with the conductive layer (115) and yet another part of quantum dot coating generates photoluminescence.
22. The vehicle glazing with quantum dot coated substrate as claimed in claim 1, wherein, quantum dot coating is applied partly on only one substrate layer such that the quantum dot coating is either in face one (170) or face two (180) of the first substrate layer (130) or in face three (190) or face four (195) of second substrate layer (140).
23. The vehicle glazing with quantum dot coated substrate as claimed in claim 22, wherein the quantum dot coating (110 or 120) is present up to l/3rd of the area of the substrate layer (130 or 140).
24. The vehicle glazing with quantum dot coated substrate as claimed in claim 22, wherein the quantum dot coating enables auto-tint of the substrate (130 or 140) which helps enable photoluminescence.
25. A method of making of the substrate (130 or 140) with the quantum dot coating according to claim 1, wherein, the substrate (130 or 140) is etched with varying pattern and is layered with a primer for adhesion of the quantum dot coating.
26. The method of making of the substrate (130 or 140) with quantum dot coating as claimed in claim 25, wherein, the substrate (130 or 140) is etched with laser etching of a minimum thickness of 100 nm.
27. The method of making of the substrate (130 or 140) with quantum dot coating as claimed in claim 25, wherein variable etching pattern results in variable surface energy for adhesion of quantum dot coating on the substrate (130 or 140).
28. A vehicle glazing unit according to claim 1, wherein the glazing is a roof light, a backlight, a windscreen, a side window, a door window or an internal vehicle component.
PCT/IN2022/050240 2021-03-17 2022-03-15 A vehicle glazing with quantum dot coated substrate WO2022195614A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN202141011325 2021-03-17
IN202141011325 2021-03-17

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WO2022195614A1 true WO2022195614A1 (en) 2022-09-22

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9054330B2 (en) * 2009-07-07 2015-06-09 University Of Florida Research Foundation, Inc. Stable and all solution processable quantum dot light-emitting diodes
US9276168B2 (en) * 2007-07-23 2016-03-01 Qd Vision, Inc. Quantum dot light enhancement substrate and lighting device including same
GB2547440A (en) * 2016-02-17 2017-08-23 Ford Global Tech Llc A display screen for a vehicle
US20200055283A1 (en) * 2017-03-31 2020-02-20 Nano-Lit Technologies Limited Transparent display
CN109899766B (en) * 2019-03-15 2020-11-03 福州大学 On-vehicle ceiling interior lamp based on garrulous crystal block of quantum dot material

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9276168B2 (en) * 2007-07-23 2016-03-01 Qd Vision, Inc. Quantum dot light enhancement substrate and lighting device including same
US9054330B2 (en) * 2009-07-07 2015-06-09 University Of Florida Research Foundation, Inc. Stable and all solution processable quantum dot light-emitting diodes
GB2547440A (en) * 2016-02-17 2017-08-23 Ford Global Tech Llc A display screen for a vehicle
US20200055283A1 (en) * 2017-03-31 2020-02-20 Nano-Lit Technologies Limited Transparent display
CN109899766B (en) * 2019-03-15 2020-11-03 福州大学 On-vehicle ceiling interior lamp based on garrulous crystal block of quantum dot material

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