CN107656330A - Quantum dot optical film, preparation method and use with sandwich construction - Google Patents
Quantum dot optical film, preparation method and use with sandwich construction Download PDFInfo
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- CN107656330A CN107656330A CN201610692771.0A CN201610692771A CN107656330A CN 107656330 A CN107656330 A CN 107656330A CN 201610692771 A CN201610692771 A CN 201610692771A CN 107656330 A CN107656330 A CN 107656330A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
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- 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
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
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Abstract
The present invention relates to the quantum dot film with sandwich construction, the quantum dot film includes one or more layers green quantum dot layer, one or more layers red quantum dot layer, wherein described amount of green color point layer and the red quantum dot layer are alternately arranged, the separate layer or dichronic mirror being also included between the green quantum dot layer and the red quantum dot layer, the invention further relates to the preparation method and purposes of the quantum dot film.
Description
Technical field
The present invention relates to luminous and light to spread field, particularly the quantum dot film with sandwich construction, and it is used as light
Diffusion barrier and the high-end fluorescent material of illumination and display.
Background technology
Liquid crystal display applications are in PC, television set, monitor, mobile phone, personal digital assistant, game machine, electronics
The similar products such as reading machine, digital camera.Traditionally backlight module combination liquid crystal cells, have required for white light is converted into
The effect of colourama.The colourama limited capacity that this traditional light-emitting device is sent, and luminous efficiency is relatively low.Therefore,
The luminescent method and device of necessary developing low-cost obtain high-purity, high efficiency and the colourama of performance boost.This hair
Bright sandwich construction quantum dot film sandwiches backlight module unit, and this new liquid-crystal apparatus combination blue light source has high colour gamut
The characteristics of.
Patent CN 201480005245.1 discloses a patent of invention for there was only the quantum dot film of single quantum dot layer.
This patent defines quantum dot of this layer of quantum dot containing two kinds of peak positions, and one of which quantum dot sends peak position under blue-light source
Shorter the first secondary light (green glow), it is (red that another quantum dot sends the longer second subprime light of peak position under blue-light source
Light).The sub- point of the larger two amounts of peak position difference (such as green and red quantum dot) is uniformly mixed to form single-phase by studies have shown that
System is easily caused that the relatively low quantum dot of peak position is unstable, that is, the phenomenon of green quantum dot Dependent Red Shift occurs.
The luminescent quantum dot of two kinds of different peak positions is mixed into single_phase system and also has another shortcoming.It is low in liquid-crystal apparatus
The red quantum dot by high peak position that the green quantum dot of peak position absorbs the green glow meeting part that blue light is sent absorbs, and changes into red
The light that quantum dot is sent.The double absorption of this light and the whole lighting efficiency for causing quantum dot is excited to reduce.
The content of the invention
For above mentioned problem of the prior art, by numerous studies and experiment, present inventors have surprisingly discovered that working as
Red and green quantum dot in quantum dot film is separated and is alternately arranged, while in red quantum dot layer and green quantum dot layer
Between when being provided with separate layer or dichronic mirror, can obtain comprising at least one green quantum dot layer (luminous peak position is shorter) and extremely
The sandwich construction quantum dot film of a few red quantum dot layer (luminous peak position is longer), this quantum dot film can reduce different peaks
Position quantum dot interferes, and avoids film-forming process from the phenomenon of quantum dot Dependent Red Shift occur, improves stability, and strengthen optimization
The free degree of every layer of luminescent properties, it is thus possible to be advantageously applied for luminous and light diffusion field, such as optical diffusion film with
And the high-end fluorescent material of illumination and display.
In the present invention, it is freely to adjust by another separated benefit of the red and green quantum dot in quantum dot film
Save the formula and technological parameter of each quantum dot layer.Due to the light that the green quantum dot of red quantum dot absorption is sent, by two kinds
The quantum dot film that quantum dot mixes, the concentration of the concentration ratio red quantum dot of usual green quantum dot is much higher, is about
2 to 10 times of red quantum dot or even 20 times.The sandwich construction quantum dot film of the present invention can be by adjusting each quantum dot layer
Thickness reduce the concentration difference of every layer of quantum dot.
Further, the inventors discovered that introducing separate layer or dichronic mirror between green and red quantum dot layer, adopting
When being film-made with UV curing process, it is possible to reduce required UV energy during solidification.In addition, when making the second quantum dot layer, retain
Separate layer, it is convenient to omit the stripping process of separate layer, and because quanta point material itself is environmentally sensitive, retains separate layer and subtract
The aerial exposure of quantum dot is lacked, the decay of quantum dot light emitting efficiency can be weakened.For point used in the present invention
Interlayer, ordinary optical high polymer material, such as polyethylene terephthalate (PET), poly-methyl methacrylate can be selected
Ester (PMMA), makrolon (PC) etc., can also select refractive index be less than in red quantum dot layer comprising polymeric material and
The optical material of the refractive index of the medium of light diffusion particle, such as the inorganic material that light transmittance is more than 85%, or from empty
Gas, nitrogen or inert gas etc..
Further, the inventors discovered that being introduced when between the green and red quantum dot layer of the quantum dot film in the present invention
When the separate layer or dichronic mirror of low-refraction, feux rouges is excited when the light of blue-light source in liquid-crystal apparatus first passes through red quantum dot,
Green glow is sent by green quantum dot again, because the effect of separate layer or dichronic mirror, green glow on a small quantity or will not can only reflex to red
Color quantum dot layer, so as to which the double absorption of blue light be reduced or avoided and excite.Also, in this liquid-crystal apparatus, dichronic mirror
Effect is that the green glow for making to send is not reflected back red quantum dot layer and absorbed again.
The quantum dot film with sandwich construction of the present invention is comprising one or more layers green quantum dot layer, one or more layers is red
Color quantum dot layer and separate layer or dichronic mirror between the green quantum dot layer and the red quantum dot layer, wherein, institute
State green quantum dot layer and the red quantum dot layer is alternately arranged, and the green quantum dot layer and the red quantum
Quantum dot in point layer is individually dispersed in the medium comprising polymeric material and light diffusion particle.
In the context of the present invention, above-mentioned " polymeric material " is commonly known commercially available of those skilled in the art
The curable polymeric material obtained, for example, the polymer of UV solidifications, such as containing acrylic acid series polymeric compounds, polymerization of epoxy resins
The polymeric material of thing and light trigger；With the polymer obtained with other methods, such as polyethylene terephthalate
(PET), polymethyl methacrylate (PMMA), makrolon (PC) etc..Moreover, it is preferably the polymeric material of optical grade,
Such as light transmittance is high, the few polymeric material of the absorption to light.
Used in the present invention " quantum dot " is preferably the luminescent nanocrystal of core/shell structure, and it commercially available can be obtained
.More specifically, the core Main Ingredients and Appearance of the nuclear shell structure quantum point is cadmium selenide, indium phosphide, lead selenide, or cadmium telluride, shell
Main Ingredients and Appearance be zinc sulphide, cadmium sulfide, vulcanized lead, or alloy material.Every layer of green quantum dot is under blue main light source
Send the secondary light green glow of single peak position, and every layer of red quantum dot sends the secondary light of simple spike position under blue main light source
Feux rouges.
The sandwich construction quantum dot film of the present invention can apply to luminous and light diffusion field, such as optical diffusion film with
And the high-end fluorescent material of illumination and display.
Brief description of the drawings
By reading following detailed description of the invention and with reference to accompanying drawing, those skilled in the art are readily appreciated that the above-mentioned mesh of the present invention
And advantage.
Fig. 1 be in embodiments of the invention 1 it is prepared first only comprising single green quantum dot 1G (luminous peak position compared with
It is short) quantum dot film 1QD structural representation.
Fig. 2 be in embodiments of the invention 1 it is prepared first only comprising single red quantum dot 2R (luminous peak position compared with
It is long) quantum dot film 2QD structural representation.
Fig. 3 shows luminous situation schematic diagram of the sandwich construction quantum dot film of embodiments of the invention 1 in Liquid crystal module,
Wherein separated between individual layer green and individual layer red quantum dot with separate layer 3M (pet layer), in Fig. 3 a, blue-light source first passes through red
Quantum dot layer, in Fig. 3 b, blue-light source first passes through green quantum dot layer.
Fig. 4 shows luminous situation schematic diagram of the sandwich construction quantum dot film of embodiments of the invention 2 in Liquid crystal module,
Wherein separated between individual layer green and individual layer red quantum dot with separate layer 4M (air of low-refraction), in Fig. 4 a, blue-light source
First pass through red quantum dot layer, in Fig. 4 b, blue-light source first passes through green quantum dot layer.
Fig. 5 shows luminous situation schematic diagram of the sandwich construction quantum dot film of embodiments of the invention 3 in Liquid crystal module,
Wherein there are dichronic mirror 5M, dichronic mirror 5M to prevent green glow from returning to red quantum dot layer between individual layer green and individual layer red quantum dot, it is blue
Light source first passes through red quantum dot layer.
Fig. 6 shows and compared for the according to an embodiment of the invention 1 sandwich construction amount by the use of optics PET film as separate layer
Son point film；The individual layer quantum dot film of green and the red quantum dot mixing of comparative example 1；With the red and green quantum of comparative example 2
Point interlayer does not have luminescent spectrum of the quantum dot film of separate layer in blue-light source liquid-crystal apparatus, wherein, in the LCD device of blue-light source
Middle test, blue-light source first pass through the red quantum dot layer of sandwich construction.
Fig. 7 shows and compared for the sandwich construction of the 2 air separate layer with low-refraction according to an embodiment of the invention
The individual layer quantum dot film of green and the red quantum dot mixing of quantum dot film and comparative example 1 is luminous in blue-light source liquid-crystal apparatus
Spectrum.
Fig. 8 shows and compared for the according to an embodiment of the invention 3 sandwich construction quantum dot film for being provided with dichronic mirror；With
The backlight that the sandwich construction quantum dot film by the use of same thickness phase same material glass as separate layer of comparative example 3 is lighted in blue-light source
Luminescent spectrum and light efficiency contrast in module.
Embodiment
The quantum dot film of single quantum dot layer is applied to principle in LCD liquid-crystal apparatus in patent
CN201480005245 was announced.The invention discloses a kind of structure, preparation and the property of the quantum dot film with sandwich construction
Energy.Sandwich construction quantum dot film of the present invention is tested in the LCD device of blue-light source.
The present invention is compound obtain sandwich construction quantum dot film before, first prepare the film of only individual layer green or red quantum dot
(the 2QD layers in 1QD layers and Fig. 2 in such as Fig. 1).Preparation method include but is not limited to UV photocurings, solvent volatilization, extrusion,
Spin-coating etc..In order to illustrate the intension of the present invention, present invention employs the method for UV photocuring film forming.The mixing of UV photocurings
Quantum dot in thing is dispersed in the mixture of the optical grade polymeric material comprising UV-curable and light diffusion particle.It is described mixed
Optical grade polymeric material in compound includes acrylic acid series resin, photoreactive epoxy resin curing agent.Add light diffusion particle (such as
The 2DP in 1DP and Fig. 2 in Fig. 1) it is to change the path of light propagation to increase absorption of the quantum dot to light.UV light is consolidated
Change mixture and be coated on the basement membrane of PET, PMMA, PC, dichronic mirror or other optical materials the (2D in 1D and Fig. 2 in such as Fig. 1
It is shown).Then, basement membrane (1U and figure in such as Fig. 1 of another layer of PET, PMMA, PC, dichronic mirror or other optical materials are sticked
Shown in 2U in 2), the structure shown in Fig. 1 and Fig. 2 is formed after solidification.The purpose for being bonded second layer basement membrane is to allow UV to solidify
Mixture isolation oxygen, fully solidify under the UV illumination of low energy.Two layers of basement membrane can be easily release.
The present invention is combined the quantum dot film of sandwich construction using the green or red quantum dot film of individual layer.In this hair
In the first bright embodiment, red quantum dot layer and green is separated with ordinary optical materials, such as PET, PMMA, PC etc.
Color quantum dot layer.Specifically, in the case of two layers of basement membrane of individual layer quantum dot film all uses PET, due to the adhesive force of basement membrane
It is relatively strong, one layer of green quantum dispensing water, lid last layer PET basement membranes, UV can be applied on any one layer of basement membrane of red quantum dot film
Structure as shown in Figure 3 a is formed after solidification, wherein the above-mentioned any one layer of basement membrane of red quantum dot film is that is, red quantum
Separate layer 3M between point layer and green quantum dot layer.Also one layer of red can be applied on green any one layer of basement membrane of quantum dot film
Quantum dot glue, structure as shown in Figure 3 b is formed after UV solidifications, wherein the above-mentioned any one layer of basement membrane of green quantum dot film is
Equivalent to the separate layer 3M between green quantum dot layer and red quantum dot layer.
The embodiment with above-mentioned separate layer of the present invention has many advantages in preparation technology and in stability.It is first
First, the UV photocuring glue of many excellent performances under conditions of not starvation, it is necessary to very high energy could solidify, if
Add last layer separate layer in solidification, the solidification energy that can be reduced by more than 50.Secondly, if employing this technique, again
Do not retain if separate layer it is necessary to be related to a separate layer stripping technology, not only increase process complexity, can also increase equipment
Cost.In addition, quanta point material is sensitive to environment such as water oxygen in itself, it is aerial sudden and violent that reservation separate layer reduces quantum dot
Dew, can weaken the decay of quantum dot light emitting efficiency.
Second of embodiment of the present invention is related to the material separates that low-refraction is used between red and green quantum dot layer
The sandwich construction quantum dot film (as shown in Figure 4) opened.Green quantum dispensing water is coated in one layer of base of individual layer red quantum dot film
On film (separate layer 4M), structure as shown in fig. 4 a is formed after UV solidifications.Red quantum dot glue is coated in individual layer green quantum
On one layer of basement membrane (separate layer 4M) of point film, structure as shown in Figure 4 b is formed after UV solidifications.When separate layer is low-refraction light
When learning layer, the luminescent properties that two kinds of membrane structures that Fig. 4 a and Fig. 4 b are obtained are tested in the LCD device of blue-light source will not
Together, because the separate layer of low-refraction can reduce the green reflection that Fig. 4 a Greens quantum dot layers (4QDG) are sent and return amount of red
Son point layer (4QDR) is absorbed.Therefore, the sandwich construction quantum dot film shown in Fig. 4 a will be sent more than structure shown in Fig. 4 b
Green glow.4U, 4M and 4D are three layers of basement membranes in Fig. 4, and wherein 4M is also functioned as separate layer.
The present invention the third embodiment be related to be capable of 100% reflect green glow dichronic mirror separate it is red and green
The sandwich construction quantum dot film (as shown in Figure 5) of color quantum dot layer.In the present embodiment, it is red as the individual layer prepared first
Quantum dot film, one layer basement membrane are the dichronic mirrors of 100% reflection green glow.The present invention applies green quantum dispensing water in this amount of red
On the dichronic mirror basement membrane of son point film, structure as shown in Figure 5 is formed after UV solidifications.Assuming that two amounts point is in macromolecule medium
Luminous efficiency and their dosages in different film layers, thickness all, the quantum dot film of this sandwich construction is in blue-light source
LCD device in will send the green glow and feux rouges of equivalent.Reason is that this dichronic mirror does not allow green glow to enter red quantum dot layer
(5QDR), the green glow that green quantum dot (5QDG) sends will not be absorbed by red quantum dot.5U and 5D is two layers of basement membrane in Fig. 5,
5M is dichronic mirror.
Embodiment
The embodiment being listed herein below illustrates the present invention by way of example, limits the invention to implement without any
The intention for the embodiment specified in example, the scope that the present invention applies are able to body in the entirety of specification and claims
It is existing.
Unless otherwise indicated, the number in following embodiments and comparative example refers to mass parts.
Embodiment 1
Sandwich construction quantum dot film with PET separate layers
By 2 parts of light diffusion particles, (spread powder EL202, purchased from strange material is gushed, the light in aftermentioned embodiment and comparative example expands
Shot is identical with this) being distributed to 20 parts of polymeric materials containing acrylic resin, photoreactive epoxy resin initiator, (UV is bonded
Agent BTW-504-33, purchased from Bei Teli, the polymeric material in aftermentioned embodiment and comparative example is identical with this) in, dispersion machine
(Dragon Lab OS20-S) rotating speed is 1800rpm, disk diameter 30mm, jitter time 10min, and repeat the above steps acquisition
Another mixture of identical.Then, into the mixture each obtained, be separately added into 1.5 portions of green quantum dot mixed liquors (by
Tianjin Nanocomy provide, peak position 520nm) and 0.5 portion of red quantum dot mixed liquor (provided by Tianjin Nanocomy, peak position
625nm), green and red quantum dot UV solidified glues are each mixed to form.By the red quantum dot glue of above-mentioned UV-curable
It is coated on the PET basement membranes of 75 μ m-thicks, after being bonded the PET basement membranes of another μ m-thick of layer 75, solidifies under 365nm UV light and obtain quantum
The individual layer red quantum dot film that point thickness is 50 μm.Green quantum dispensing water is applied on the PET basement membranes of red quantum dot layer side,
Stick the PET basement membranes of another μ m-thick of layer 75,50 μm of the green quantum dot thickness that UV solidifications are formed after drying.This technique is formed more
Rotating fields quantum dot film is as shown in Figure 3 a.
The spectrum of the sandwich construction quantum dot film is as shown in 6DML in Fig. 6.
Comparative example 1
In line with the purpose of contrast and research, the individual layer quantum dot film as a comparison case 1 that quantum dot layer is 100 μm is prepared for.
By 1 part of light diffusion particle be distributed to 20 parts containing acrylic resin, photoreactive epoxy resin initiator polymeric material in, point
Dissipate machine (Dragon Lab OS20-S) rotating speed 1800rpm, disk diameter 30mm, jitter time 10min.Then, 0.75 part is added
Green quantum dot (being provided by Tianjin Nanocomy, peak position 520nm) and 0.25 part of red quantum dot (are carried by Tianjin Nanocomy
For peak position 625nm), it is mixed to form the UV solidified glues containing green and red quantum dot.Because every kind of quantum dot thickness increase
1 times, so glue quantum dot concentration is reduced to half.The quantum dot glue of this UV-curable is coated in the PET basement membranes of 75 μ m-thicks
On, after being bonded the PET basement membranes of another μ m-thick of layer 75, solidify under 365nm UV light and obtain the individual layer that quantum dot thickness is 100 μm
Quantum dot film.
The spectrum of the individual layer quantum dot film is as shown in 6SL in Fig. 6.
Comparative example 2
The red and green quantum dot interlayer of individual layer do not had into the quantum dot film of separate layer as a comparison case 2.Preparation method with
Embodiment 1 is essentially identical, differs only in：In the preparation process of above-mentioned multi-layer quantum point film, when preparing red quantum dot film
Using easy release PET basement membranes, then, one layer of easy release PET basement membrane of red quantum dot film is torn, apply last layer green quantum dot
Glue, last layer PET basement membranes are pasted, the multi-layer quantum point film of no separate layer is formed after UV solidifications.
The spectrum of the quantum dot film is as shown in 6DL in Fig. 6.
By the quantum dot film and the quantum dot film of comparative example 1 and comparative example 2 with sandwich construction of the embodiment of the present invention 1
Spectrum compares, as shown in fig. 6, spectrum 6DML show the embodiment of the present invention 1 the quantum dot film with sandwich construction send it is green
Coloured light 6DML (crest 528 or so) is more than the 6SL of comparative example 1 individual layer quantum dot film, it is meant that the present invention will be red and green
The separated way of color quantum dot can reduce the absorption for the green glow that red quantum dot is sent to green quantum dot.
And in actual applications, the addition of the green quantum dot in individual layer quantum dot film is 4 to the 10 of red quantum dot
Times so 20 times, cause green quantum dot concentration higher, so that its stability in covering material reduces.
Red quantum dot and green quantum dot are respectively coated by multi-layer quantum point film in different layers by the present invention, and with separation
Layer separates, additionally, also with following advantage：
(1) luminosity of red or green quantum dot can be strengthened using different covering materials, such as red
Color quantum dot layer, quantum dot can be blended in epoxy resin UV glue, for green quantum dot layer, quantum dot can be mixed
Close in polyurethanes UV glue；
(2) stability of red or green quantum dot, such as green quantum can be strengthened using different covering materials
Point is using the stronger UV glue cladding of alkalescence；
(3) red and green layer can optimize the parameter of product and cost using different thickness, due to red quantum
Point can absorb the light that green quantum dot is sent, as described above, in monofilm, green quantum dot dosage is the 4 of red quantum dot
To 20 times, that is to say, that the concentration of green quantum dot is 4 to 20 times of red quantum dot.Green and red quantum dot are separated,
The thickness of red quantum dot layer can be reduced, increases concentration of the red quantum dot in red color layer, reduces concentration difference and red green amount
Son point interferes；
(4) reduction of quantum dot light emitting efficiency in film-forming process is reduced.Spectroanalysis instrument is configured using U.S. Thorlabs
Integrating sphere measurement embodiment 1, comparative example 1 and 2 quantum dot luminous efficiency, find the embodiment of the present invention 1 above-mentioned quantum
The luminous efficiency of point film is 85%, and the individual layer quantum dot film luminous efficiency of comparative example 1 is only 75%, comparative example 2 without separation
The luminous efficiency of the quantum dot film of layer is 80%, is inferior to the luminous efficiency of the quantum dot film of embodiments of the invention 1.
Embodiment 2
Sandwich construction quantum dot film with low-refraction separate layer (air dielectric)
2 parts of light diffusion particle is distributed to 20 parts of polymer containing acrylic resin, photoreactive epoxy resin initiator
In material, dispersion machine (Dragon Lab OS20-s) rotating speed is 1800rpm, disk diameter 30mm, jitter time 10min, is repeated
Another mixture of above-mentioned steps acquisition identical.Then, into the mixture each obtained, 1.5 parts of amount of green color are separately added into
Son order mixed liquor (Tianjin Nanocomy offer, peak position 520nm) and 0.5 portion of red quantum dot mixed liquor, and (Tianjin Nanocomy is carried
For peak position 625nm), each it is mixed to form green and red quantum dot UV solidified glues.Two kinds of glue are coated in 75 μ m-thicks respectively
On PET basement membranes, after being bonded the PET basement membranes of another μ m-thick of layer 75, solidify under 365nm UV light and obtain the quantum dot of two individual layers
Film.In the present embodiment, the quantum dot glue after solidification approaches with PET basement membrane refractive indexes, and one layer of PET basement membrane of fitting does not connect
Touching the side of quantum dot glue has 30 microns of deep horizontal stripe rills for being spaced 50 microns.In test, directly by two film strips lines
The side stacks, and is that air separates equivalent to centre, namely air layer act as the separate layer of low-refraction.
The quantum dot film of this sandwich construction is put into the LCD device of blue-light source, with spectrometer come the luminous of detection panel
Intensity.Fig. 7 shows the luminescent properties of the quantum dot film of two kinds of placement relations of the present embodiment.Spectrum 7RB corresponds to Fig. 4 a institutes
The near sandwich construction quantum dot film of the red leafing blue-light source shown, spectrum 7GB correspond to the green leafing blue-light source shown in Fig. 4 b
Near sandwich construction quantum dot film.Sandwich construction quantum dot film reduces red quantum dot in the LCD of blue-light source corresponding to 7RB
Absorption to green glow, so have issued more green glows.And sandwich construction quantum dot film is in the LCD of blue-light source corresponding to 7GB
Absorb more green glows and be converted into feux rouges, so have issued more feux rouges.
Compared with comparative example 1, the individual layer quantum dot film of comparative example 1 is put into the LCD device of blue-light source, uses spectrum
Instrument carrys out the luminous intensity of detection panel, and the 7SL in Fig. 7 corresponds to the luminous intensity of the comparative example 1.As can be seen that when such as this reality
Apply using low-refraction separate layer and when red quantum dot layer is close to blue-light source described in example 2, the spectrum of the gained of the present embodiment 2
7RB shows that the quantum dot film of the sandwich construction of the present embodiment obtains more green glows, so as to compared with individual layer quantum dot film, subtract
Lack the double absorption of green quantum dot and excited, enhance the synthesis luminous efficiency of quantum dot.
Embodiment 3
The quantum dot film of sandwich construction with dichronic mirror
The multilayer knot of red and green quantum dot layer is separated with the dichronic mirror for being capable of 100% reflection certain incident direction green glow
Structure quantum dot film.The incidence angle of dichronic mirror used in the present embodiment is 45 °, 6.5 millimeters of thickness, 30 millimeters of diameter.Due to
Used dichronic mirror is thicker smaller, can not be in the direct film in its surface, and the green or red quantum dot film of individual layer is first made in we
To carry out this experiment.1 part of light diffusion particle is distributed to 20 parts containing acrylic resin, photoreactive epoxy resin initiator
In polymeric material, dispersion machine (Dragon Lab OS20-S) rotating speed 1200rpm, disk diameter 30mm, jitter time 10min,
Another mixture of the acquisition identical that repeats the above steps.Then, into the mixture each obtained, be separately added into 1.0 parts it is green
Color quantum dot mixed liquor (Tianjin Nanocomy is provided, peak position 520nm) and 0.6 part of red quantum dot mixed liquor (Tianjin
Nanocomy is provided, peak position 625nm), each it is mixed to form green and red quantum dot UV solidified glues.Gained UV-curable
Red quantum dot glue is coated on the PET basement membranes of 75 μ m-thicks, after being bonded the easy release PET basement membranes of another μ m-thick of layer 75, in 365nm
UV light under solidify after to tear easily release PET basement membranes off to obtain quantum dot thickness be 50 μm of individual layer red quantum dot film.Similarly, institute
The green quantum dispensing water for obtaining UV-curable is coated on the PET basement membranes of 75 μ m-thicks, is bonded the easy release PET bases of another μ m-thick of layer 75
After film, tear easily release PET basement membranes after solidifying under 365nm UV light off and obtain the individual layer green quantum that quantum dot thickness is 50 μm
Point film.
Similarly, since used dichronic mirror is thicker, test can not be carried out in LCD device.In the present embodiment, use is devised
The backlight module of blue-light source detects the effect using dichronic mirror.Optic film structure in backlight module as shown in figure 8, wherein,
The blue light 8BL that side enters enters light guide plate 8LGP, by the total reflection film 8SR in one layer of reverse light-source direction, passes through sandwich construction quantum
Point film 8MLQD, then by two layers brightness enhancement film 8BEF and 8DEF, then imitated with spectrometer detection light.
The quantum dot film 8MLQD bottoms with sandwich construction of the present embodiment are one layer of amount of red made from the above method
Son point layer 8R, separate layer is dichronic mirror 8DM.
Spectrometer detects the obtained quantum dot film 8MLQD with sandwich construction spectrum as shown in 8DML in Fig. 8.
Comparative example 3
Except replacing the dichronic mirror 8DM in embodiment 3 with the equal thickness optical glass 8G of no color separation effect, with implementation
The identical method of example 3 prepares the quantum dot film with sandwich construction and imitated with spectrometer detection light, as a result such as the 8GL in Fig. 8
It is shown.
By embodiment 3 compared with the light efficiency result of comparative example 3, it can be seen that 8DML shows similar equivalent
Feux rouges and green glow, and 8GL green glows are reduced, feux rouges increases.Its main cause is exactly the non-dichronic mirror because in this backlight module
8G green glow can be made repeatedly to be absorbed by red quantum dot layer, cause overall green glow to reduce, feux rouges increases.It is general next
Say, the luminous efficiency of quantum dot causes the total of quantum dot film less than 100%, therefore because green glow is absorbed by red quantum dot
Body luminous efficiency reduces.The light double absorption of light source can be effectively reduced using the embodiment 3 of dichronic mirror and is excited, enhancing amount
The luminous efficiency of son point film.
Embodiment described above and comparative example demonstrate the advantageous effects of the present invention, such as reduce green and red
Color quantum dot interferes, and strengthens 5 to 10 percentage points of the luminous efficiency of quantum dot film.Embodiment 1 and comparative example 1 and 2
Comparing result demonstrate the present invention quantum dot film in interference of the red quantum dot to green quantum dot illumination effect it is less, simultaneously
Quantum dot light emitting efficiency adds about 10 percentage points.Separated in embodiment 2 between two layers of quantum dot with the medium of low-refraction
When, illumination effect of the contrast red color layer close to blue-light source and green layer close to blue-light source, when as a result proving that red leafing light source is near,
Absorption of the red quantum dot to green glow can be further reduced, the double absorption of light source is reduced and excites.Embodiment 3 examines use
Advantage of the dichronic mirror as separate layer, the separate layer with non-dichronic mirror contrast, and it is red as a result to prove that dichronic mirror can be reduced further
Interference of the color quantum dot to green quantum dot light emitting, reduce the double absorption of light source and excite.
It the above is only the embodiment for illustrating the present invention, any formal limit not made to the present invention
System.Although the present invention is disclosed above with separate embodiment, but is not limited to the present invention.It is any to be familiar with this professional skill
Art personnel, without departing from the scope of the present invention, make a little change using the technology contents of the disclosure above or repair
Decorations will be considered as the equivalent embodiment of equivalent variations.In every case without departing from technical solution of the present invention content, the technology according to the present invention
Essence, within the spirit and principles in the present invention, any simply modification, the equivalent substitution made to above case study on implementation are with changing
Enter, belong within the protection domain of technical solution of the present invention.
Description of reference numerals
The numbering of numeral only representative graph before reference, the general mark of some of which are not subject to the numbering of figure
Distinguish
DP light diffusion particles
U upper stratas basement membrane
D lower floors basement membrane
QD quantum dot layers
G green quantum dots
R red quantum dots
BL blue-light sources
QDR red quantum dot layers
QDG green quantum dot layers
RL feux rouges
GL green glows
3M, 4M separate layer
5M dichronic mirrors
The luminescent spectrum of the quantum dot film of 6DL comparative examples 2
The luminescent spectrum of the quantum dot film of 6SL comparative examples 1
The luminescent spectrum of the quantum dot film of 6DML embodiments 1
Luminescent spectrum of the red quantum dot layer of 7RB embodiments 2 close to blue-light source
Luminescent spectrum of the green quantum dot layer of 7GB embodiments 2 close to blue-light source
The luminescent spectrum of the quantum dot film of 7SL comparative examples 1
LGP light guide plates
SR total reflection films
MLQD sandwich construction quantum dot films
BEF, DEF brightness enhancement film
8DM dichronic mirrors
The luminescent spectrum of the quantum dot film of 8DML embodiments 3
The luminescent spectrum of the quantum dot film of 8GL comparative examples 3.
Claims (12)
1. quantum dot film, it is included：
One or more layers green quantum dot layer,
One or more layers red quantum dot layer, and
Separate layer or dichronic mirror between the green quantum dot layer and the red quantum dot layer,
Wherein, the quantum dot in the green quantum dot layer and the red quantum dot layer is individually dispersed in comprising polymeric material
In the medium of light diffusion particle, and the green quantum dot layer and the red quantum dot layer are alternately arranged.
2. quantum dot film as claimed in claim 1, wherein, the number of plies of the green quantum dot layer and the red quantum dot layer
It is respectively less than independently of one another or equal to 5 layers, is preferably each independently 1 or 2 layer.
3. quantum dot film as claimed in claim 1 or 2, wherein, the green quantum dot layer includes being given an account of for 20 mass parts
The green quanta point material of matter and 0.01 to 2.5 mass parts, preferably 0.3 to 2.5 mass parts, more preferably 0.5 to 2.0 mass parts,
Thickness range with the green quantum dot layer is 5 to 100 microns, preferably 10 to 50 microns.
4. the quantum dot film as described in claim any one of 1-3, wherein, the red quantum dot layer includes the institute of 20 mass parts
Give an account of the red quantum dot material of matter and 0.01 to 2.0 mass parts, preferably 0.05 to 1.0 mass parts, and the red quantum dot
The thickness range of layer is 5 to 100 microns, preferably 10 to 50 microns.
5. the quantum dot film as described in claim any one of 1-4, wherein, the separate layer is less than the red comprising refractive index
The optical material of the refractive index of the medium in quantum dot layer, such as the inorganic material that light transmittance is more than 85%；Air, nitrogen
Gas, inert gas；Or ordinary optical high polymer material, such as polyethylene terephthalate (PET), polymethylacrylic acid
Methyl esters (PMMA), makrolon (PC).
6. the multi-layer quantum point film as described in claim any one of 1-5, wherein, the spacer thickness scope is 5 to 50 micro-
Rice.
7. the quantum dot film as described in claim any one of 1-6, wherein, the smooth diffusion particle is selected from silica, dioxy
Change titanium, modified organic silicon, high molecular emulsion and combinations thereof.
8. the multi-layer quantum point film as described in claim any one of 1-7, wherein, the particle size range of the smooth diffusion particle is
0.5 to 20 microns, relative to the polymeric material of 20 mass parts, the addition of the smooth diffusion particle is 0.01 to 5 matter
Measure part.
9. the multi-layer quantum point film as described in claim any one of 1-8, wherein, the green quantum dot layer contains single luminous
The luminescent nanocrystal of the core shell structure of peak position, its peak position scope are 510nm to 550nm, and/or the red quantum dot layer contains
There is the luminescent nanocrystal of the core shell structure of single luminous peak position, its peak position scope is 610nm to 670nm.
10. the multi-layer quantum point film as described in claim any one of 1-9, wherein, the polymeric material includes UV solidifications
Polymer, such as polymeric material containing acrylic acid series polymeric compounds, epoxide resin polymer and light trigger；Obtained with other methods
The polymer arrived, such as polyethylene terephthalate (PET), polymethyl methacrylate (PMMA), makrolon (PC).
11. the multi-layer quantum point film as described in claim any one of 1-10, wherein, the quantum dot layer selected from UV by solidifying
It is prepared by a kind of method of method, solvent evaporation method and extrusion molding.
12. the purposes of the multi-layer quantum point film as described in claim any one of 1-11, it is used for luminous and light diffusion field, example
Such as it is used as optical diffusion film and the high-end fluorescent material of illumination and display.
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| CN201610692771.0A CN107656330A (en) | 2016-08-19 | 2016-08-19 | Quantum dot optical film, preparation method and use with sandwich construction |
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| CN201610692771.0A CN107656330A (en) | 2016-08-19 | 2016-08-19 | Quantum dot optical film, preparation method and use with sandwich construction |
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Family
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