CN105938284A - White fluorescence cholesteric liquid crystal device based on chiral ions, and preparation technology thereof - Google Patents
White fluorescence cholesteric liquid crystal device based on chiral ions, and preparation technology thereof Download PDFInfo
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- CN105938284A CN105938284A CN201610301213.7A CN201610301213A CN105938284A CN 105938284 A CN105938284 A CN 105938284A CN 201610301213 A CN201610301213 A CN 201610301213A CN 105938284 A CN105938284 A CN 105938284A
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- liquid crystal
- cholesteric liquid
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- crystal device
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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
- G02F1/137—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/13718—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on a change of the texture state of a cholesteric liquid crystal
-
- 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
- G02F1/137—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/13762—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering containing luminescent or electroluminescent additives
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal Substances (AREA)
- Liquid Crystal (AREA)
Abstract
The present invention discloses a white fluorescence cholesteric liquid crystal device based on chiral ions. The white fluorescence cholesteric liquid crystal device is formed by two transparent substrate layers and a single cholesteric liquid crystal layer clamped therebetween. The white fluorescence cholesteric liquid crystal device is simple in technology and high in implementation, white fluorescence is present, the color rendering index is high, and rapid switching can be carried out.
Description
Technical field
The present invention relates to liquid crystal device field, a kind of white fluorescent cholesteric liquid crystal device based on chiral ion
And preparation technology.
Background technology
White light emitting material has superior performance in terms of color fidelity, so it has in terms of visible light display and illumination
Great potential.The research of white light emitting material and device in recent years achieves the biggest achievement, and white light emitting material can be mixed by physics
Conjunction or chemosynthesis have the chromophoric group of complementary emission color and obtain.Therefore, the generation of white light often relies on white light emitting material
Synthetic method and the preparation technology of period.The method that current people obtain white electroluminescence mainly has following 3 kinds: (1) is being sent out
Doped with fluorescent dyes in photosphere, is transmitted by the incomplete energy between material of main part and guest materials, and the two is simultaneously emitted by not
With the light of color, thus realize white electroluminescence；(2) in the multilamellar luminescent device including red bluish-green luminescent layer, by not
Adjust the recombination region of carrier with the level-density parameter of material, or use electronics (hole) barrier layer to obtain white light；(3) three bases
The superposition that color RGB is luminous.But the operational stability of the purity of material and device is white light emitting material and maximum the asking of device thereof
Topic.The reason that cost is high, efficiency is low, device exterior coupling efficiency is low, operational stability is poor also contributes to the application of white light parts.
Therefore, designing, inventing a kind of color rendering index white fluorescent device that is high and that quickly regulate is to be badly in need of at present solving
Technical problem.
Summary of the invention
It is an object of the invention to provide a kind of white fluorescent cholesteric liquid crystal device based on chiral ion and preparation work thereof
Skill, to solve the problem that white fluorescent device color rendering index is low, can not quickly regulate.
In order to achieve the above object, the technical solution adopted in the present invention is:
Described a kind of based on chiral ion white fluorescent cholesteric liquid crystal device, it is characterised in that: include two-layer
Transparent substrate layer and double team monolayer cholesteric crystal layer between two transparent substrate layer, wherein luminescent material is entrained in liquid crystal layer
In, cholesteric liquid crystal by nematic liquid crystal doping chiral agent constitute with chiral ion, cholesteric liquid crystal two transparent substrate layer it
Between helically Gradient distribution.
A kind of white fluorescent cholesteric liquid crystal device based on chiral ion, it is characterised in that: described luminescent material divides
It is distributed in cholesteric liquid crystal.When pitch is uniformly distributed, device presents single fluorescent characteristic；When forming pitch gradient, device
Part fluorescence spectrum broadens, and color rendering index uprises.
Described cholesteric liquid crystal is negative liquid crystal, and the luminescent material weight adulterated is nematic liquid crystal weight
0.15%-0.25%, cholesteric liquid crystal is made up of nematic liquid crystal doping chiral agent and chiral ion, and chiral agent weight is nematic
The 4%-25% of phase liquid crystal weight, the chiral ion simultaneously adulterated is imidazole chiral ion, and its weight is nematic liquid crystal
The 4%-10% of weight.
The preparation technology of a kind of white fluorescent cholesteric liquid crystal device based on chiral ion, it is characterised in that include following
Step:
First two-layer in liquid crystal device is injected in the mixing of nematic liquid crystal, fluorescent material, chiral agent and chiral ion transparent
Between substrate layer, nematic liquid crystal and chiral agent, chiral ion are mixed to get cholesteric liquid crystal, between two-layer transparent substrate layer
Apply DC electric field, switch to high-frequency alternating current field after stablizing, i.e. obtain stable white fluorescent cholesteric liquid crystal device.
The preparation technology of described a kind of based on chiral ion white fluorescent cholesteric liquid crystal device, it is characterised in that:
Applying size is that the DC voltage of 100V induces the distribution of its pitch gradient, during applying on described cholesteric liquid crystal
Between be 3s；The 100V high-frequency ac voltage applying 100KHz again obtains the liquid crystal molecule of regular arrangement, application time 0.4s, high frequency
AC field frequency must be sufficiently high, more than 60KHz, pitch gradient can be kept constant.
Compared with tradition width white fluorescent device, the present invention has the beneficial effect that:
1, the present invention utilizes high-voltage dc and high-frequency ac electric field to produce cholesteric liquid crystal pitch gradient, process letter
Easily, implementation is strong.Realize being switched fast glow color by electric field adjusting.
2, liquid crystal device white fluorescent color rendering index of the present invention is high, before there is huge application in illumination and display field
Scape.
3, liquid crystal device of the present invention is different from the led white light parts studied before, real in terms of cholesteric liquid crystal displays
Show white fluorescent.
4, the present invention utilizes nematic liquid crystal doping fluorescent material, chiral agent and chiral ion to carry out device to prepare, technique
Simply.
Accompanying drawing explanation
Fig. 1 is the white fluorescent cholesteric liquid crystal devices structure chart prepared by the present invention.
Fig. 2 is the schematic flow sheet that the embodiment of the present invention prepares white fluorescent cholesteric liquid crystal devices.
Fig. 3 is transmittance graph figure and the fluorescence curve figure of liquid crystal device prepared by the embodiment of the present invention.
Detailed description of the invention
As it is shown in figure 1, a kind of white fluorescent cholesteric liquid crystal device based on chiral ion, include two-layer transparency carrier
Layer 1 and double team monolayer liquid crystal layer between two transparent substrate layer.Luminescent material 2 is evenly distributed in cholesteric liquid crystal, along with
Liquid crystal molecule helically Gradient distribution.Liquid crystal layer is cholesteric liquid crystal 3, by nematic liquid crystal doped luminescent material, chiral agent and
Chiral ion is constituted.Cholesteric liquid crystal 3 helically Gradient distribution between two transparent substrate layer 1.
Cholesteric liquid crystal 3 is negative liquid crystal, the 0.15%-that luminescent material weight is nematic liquid crystal weight adulterated
0.25%, cholesteric liquid crystal is made up of nematic liquid crystal doping chiral agent and chiral ion 4, and chiral agent weight is nematic liquid crystal
The 4%-25% of weight, the chiral ion simultaneously adulterated is imidazole chiral ion, and its weight is nematic liquid crystal weight
4%-10%.
A kind of preparation technology of white fluorescent cholesteric liquid crystal device based on chiral ion, first by cholesteric liquid crystal,
Luminescent material, chiral agent and chiral ion mixing are injected in liquid crystal device between two-layer transparent substrate layer 1, nematic liquid crystal and hands
Property agent, chiral ion be mixed to get cholesteric liquid crystal, to applying DC electric field between two-layer transparent substrate layer, stable after switch to
High-frequency ac electric field, i.e. obtains white fluorescent cholesteric liquid crystal device.
Applying size is that the DC voltage of 100V induces the distribution of its pitch gradient, during applying on described cholesteric liquid crystal
Between be 3s；The 100V high-frequency ac voltage applying 100KHz again obtains the liquid crystal molecule of regular arrangement, application time 0.4s, high frequency
AC field frequency must be sufficiently high, more than 60KHz, pitch gradient can be kept constant.
The present invention is doped luminescent material, chiral agent and chiral ion material in nematic liquid crystal, lures under electric field action
Drain crystalline substance pitch gradient is distributed, thus obtains white luminous liquid crystal device, and the internal structure of device is as shown in Figure 1.Preparation
Liquid crystal device has white light emission performance, high and quickly regulation the advantage of color rendering index.
Present invention white fluorescent based on chiral ion cholesteric liquid crystal device by the transparent glass substrate being parallel to each other and
The cholesteric liquid crystal composition of pitch gradient distribution in liquid crystal cell.
Liquid crystal device of the present invention induces pitch gradient through DC electric field, then controls through sufficiently high frequency high-frequency ac electric field
Obtain the regular arrangement of liquid crystal molecule.
Embodiment:
1, the preparation of cholesteric liquid crystal
The proportioning weighing cholesteric liquid crystal is:
HNG715600-100/S811/CIM/AFAN=79.91%/15.98%/4%/0.11% (wt%).
Used HNG715600-100 is the negativity nematic phase liquid that Jiangsu Hecheng Display Technology Co., Ltd. produces
Brilliant；AFAN is luminescent material, and chemical formula isS811 is chiral agent, and chemical formula is
CIM is chiral ion, and chemical formula is
By cholesteric liquid crystal heated and stirred in thermal station, heat time heating time 30min, heating-up temperature is 95 DEG C.
2, the preparation of liquid crystal device
The preparation of device is as shown in Figure 2.Above-mentioned cholesteric liquid crystal utilizes capillary tube method inject in 30 μm liquid crystal cells, executes
Adding DC voltage 100V, be then switched to high-frequency ac voltage, test device transmittance graph, checking obtains white fluorescent cholesteric
Phase liquid crystal display part.
3, liquid crystal device performance test
The transmittance graph figure of white fluorescent cholesteric liquid crystal displays part of preparation and fluorescence curve figure as shown in Figure 3,
Wherein (A) is the transmittance graph of prepared white fluorescent cholesteric liquid crystal devices.It it is P state when pitch is uniformly distributed
(planar texture state), corresponding to the solid line in figure, has the narrow zone of reflections；It it is broadband (wide ripple when pitch gradient is distributed
Section display state), corresponding to the dotted line in figure, there is the relatively wide zone of reflections.Wherein (B) is prepared white fluorescent cholesteric phase liquid
The fluorescence curve figure of LCD, the solid line in figure is P state, has a stronger blue-fluorescence peak；Dotted line in figure is wide
Band, presents wide photoluminescent band, and color rendering index is high.
White light cholesteric liquid crystal device internal structure as shown in Figure 1, owing to electric field adjusting, cholesteric liquid crystal can be passed through
Pitch gradient can quickly be distributed, such that it is able to be switched fast between blue-fluorescence and white fluorescent.
Claims (5)
1. a white fluorescent cholesteric liquid crystal device based on chiral ion, it is characterised in that: by two-layer transparent substrate layer with
And the cholesteric crystal layer composition between two-layer transparency carrier.Cholesteric liquid crystal by nematic liquid crystal doping chiral agent and chirality from
Son is constituted；Luminescent material is distributed in cholesteric liquid crystal, with Liquid Crystal Molecules Alignment；The pitch of cholesteric liquid crystal is at two transparency carriers
Distribution gradient between Ceng.
A kind of white fluorescent cholesteric liquid crystal device based on chiral ion the most according to claim 1, it is characterised in that:
When pitch is uniformly distributed, device presents single fluorescent characteristic；And when forming pitch gradient, device fluorescence spectrum broadens,
Color rendering index uprises.
A kind of white fluorescent cholesteric liquid crystal device based on chiral ion the most according to claim 1, it is characterised in that:
Described cholesteric liquid crystal is negative liquid crystal, the 0.15%-0.25% that luminescent material weight is nematic liquid crystal weight adulterated, gallbladder
Steroid phase liquid crystal is made up of nematic liquid crystal doping chiral agent and chiral ion, and chiral agent weight is the 4%-of nematic liquid crystal weight
25%, the chiral ion simultaneously adulterated is imidazole chiral ion, and its weight is the 4%-10% of nematic liquid crystal weight.
4. the preparation technology of a white fluorescent cholesteric liquid crystal device based on chiral ion, it is characterised in that include following step
Rapid:
First the mixing of nematic liquid crystal, fluorescent material, chiral agent and chiral ion is injected the two-layer transparency carrier of liquid crystal device
Between Ceng, to applying DC electric field between two-layer transparent substrate layer, after stablizing, switch to high-frequency alternating current field, i.e. obtain white glimmering
Light cholesteric liquid crystal device.
The preparation technology of a kind of white fluorescent cholesteric liquid crystal device based on chiral ion the most according to claim 4,
It is characterized in that: applying size is that the DC voltage of 100V induces the distribution of its pitch gradient on described cholesteric liquid crystal, executes
Adding the time is 3s；The 100V high-frequency ac voltage applying 100KHz again obtains the liquid crystal molecule of regular arrangement, application time
0.4s, high-frequency ac electric field frequency must be sufficiently high, more than 60KHz, pitch gradient can be kept constant.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112342036A (en) * | 2020-10-21 | 2021-02-09 | 复旦大学 | Liquid crystal material combining structural color and fluorescence and liquid crystal device |
| CN114879399A (en) * | 2022-04-28 | 2022-08-09 | 合肥工业大学 | Polymer stabilized cholesteric liquid crystal color-changing glass and preparation method and application thereof |
| CN115161035A (en) * | 2022-07-11 | 2022-10-11 | 华中科技大学 | Photoresponse cholesteric liquid crystal gel, and preparation method and application thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112342036A (en) * | 2020-10-21 | 2021-02-09 | 复旦大学 | Liquid crystal material combining structural color and fluorescence and liquid crystal device |
| CN112342036B (en) * | 2020-10-21 | 2022-12-16 | 复旦大学 | Liquid crystal material combining structural color and fluorescence and liquid crystal device |
| CN114879399A (en) * | 2022-04-28 | 2022-08-09 | 合肥工业大学 | Polymer stabilized cholesteric liquid crystal color-changing glass and preparation method and application thereof |
| CN115161035A (en) * | 2022-07-11 | 2022-10-11 | 华中科技大学 | Photoresponse cholesteric liquid crystal gel, and preparation method and application thereof |
| CN115161035B (en) * | 2022-07-11 | 2023-10-20 | 华中科技大学 | Light response cholesteric liquid crystal gel, preparation method and application thereof |
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Application publication date: 20160914 |