CN112909719A - Polymer stabilized liquid crystal laser and method and apparatus for making same - Google Patents
Polymer stabilized liquid crystal laser and method and apparatus for making same Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/1065—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using liquid crystals
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Abstract
The invention discloses a polymer stabilized liquid crystal laser and a preparation method and equipment thereof. The polymer stabilized liquid crystal laser includes a laser body including: a first light-transmitting conductive layer; the second light-transmitting conductive layer is arranged opposite to the first light-transmitting conductive layer; and the resonant cavity unit is positioned between the first light-transmitting conducting layer and the second light-transmitting conducting layer, and perovskite quantum dot polymer stable liquid crystal is filled in the resonant cavity unit. The polymer stabilized liquid crystal laser provided by the embodiment of the invention has at least the following beneficial effects: the perovskite quantum dots in the polymer stabilized liquid crystal have high fluorescence quantum yield which can reach 50-100%. The extremely high fluorescence quantum yield makes it easier to generate ASE and, correspondingly, lasing, which further results in higher emission intensity and lower lasing threshold.
Description
Technical Field
The invention relates to the technical field of lasers, in particular to a polymer stabilized liquid crystal laser and a preparation method and equipment thereof.
Background
A laser is generally composed of a pump source, a resonant cavity, and a gain medium. The gain medium is generally a luminescent dye or a semiconductor luminescent material, the pumping source is used as an external energy source, the gain medium generates population inversion, the resonant cavity selects light with certain frequency and wavelength to perform gain amplification, and when the gain of the generated light is larger than a loss threshold value, the laser can generate laser emission. The most commonly used laser at present is a semiconductor laser, but the semiconductor laser has poor temperature characteristics, is easy to generate noise, and output light is scattered, so that the laser is not suitable for application in some occasions. In contrast, the polymer stabilized liquid crystal laser has the advantages of high stability, large tuning range and the like, and can solve some defects of the semiconductor laser. However, the gain medium of polymer stabilized liquid crystal lasers is typically a luminescent dye such as DCM and PM597, but common luminescent dyes result in high laser threshold and low emission intensity of polymer stabilized liquid crystal lasers.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a polymer stabilized liquid crystal laser with low laser threshold and high emission intensity and a preparation method thereof.
According to an embodiment of the first aspect of the invention, a polymer stabilized liquid crystal laser comprises a laser body comprising:
a first light-transmitting conductive layer;
the second light-transmitting conductive layer is arranged in parallel relative to the first light-transmitting conductive layer;
and the resonant cavity unit is positioned between the first light-transmitting conducting layer and the second light-transmitting conducting layer, and perovskite quantum dot polymer stable liquid crystal is filled in the resonant cavity unit.
The polymer stabilized liquid crystal laser provided by the embodiment of the invention has at least the following beneficial effects:
when the wavelength of Amplified Spontaneous Emission (ASE) light of the doped perovskite quantum dots in the polymer stabilized liquid crystal laser provided by the embodiment of the invention, which is excited by the pumping source, is just overlapped with the reflection waveband of the polymer stabilized liquid crystal, light generated by the amplified spontaneous emission is continuously reflected by the polymer stabilized liquid crystal, the reflected light further excites the perovskite quantum dots to generate stimulated radiation, and further optical gain is continuously realized, and when the generated optical gain is larger than the loss of the light caused by reflection and refraction in the transmission process, laser emission can be realized. The perovskite quantum dots doped in the perovskite quantum dot polymer stabilized liquid crystal have high fluorescence quantum yield which can reach 50-100%. The extremely high fluorescence quantum yield makes it easier to generate ASE and, correspondingly, lasing, which further results in higher emission intensity and lower lasing threshold.
According to some embodiments of the invention, the perovskite quantum dot polymer stabilized liquid crystal is CsPbX3Perovskite quantum dot polymer stabilized liquid crystal (all-inorganic perovskite quantum dot polymer stabilized liquid crystal), wherein X is Cl or ClmBr3-m、Br、BrmI3-mAt least one of I and I, 0<m<3. Perovskite quantum dot as high-performance luminescent material, CsPbX represented therein3The quantum dot fluorescence quantum yield is high, the threshold of ASE generated is extremely low after the perovskite quantum dot polymer is used for stabilizing liquid crystal, the half-height width of luminescence is narrow, the wavelength can reach below 20nm, and the linearity is good.
According to some embodiments of the invention, there are at least two perovskite quantum dots in the perovskite quantum dot polymer stabilized liquid crystal, different perovskite quantum dots having different luminescence bands. Due to the adjustability of the pitch of the polymer stabilized liquid crystal, after voltage is applied to the polymer stabilized liquid crystal or the voltage on two sides is changed through the first light-transmitting conducting layer and the second light-transmitting conducting layer on two sides, free impurity cations in the polymer stabilized liquid crystal can drive the polymer network to move, further the spiral structure of the cholesteric liquid crystal is driven to deform, a pitch gradient or a pitch gradient is formed to change, and a photon forbidden band is changed, so that a light-emitting waveband is changedDifferent perovskite quantum dots can respectively realize laser emission along with the change of photon forbidden bands, so that the laser realizes the color changing effect. For example, CsPbCl with a blue light emission band may be included3CsPbBr with green light-emitting waveband3And CsPbI with red light-emitting waveband3And the like.
According to some embodiments of the present invention, the polymer stabilized liquid crystal in the perovskite quantum dot polymer stabilized liquid crystal is mainly formed by mixing raw materials of a negative liquid crystal, a chiral dopant, a liquid crystal monomer and a photoinitiator. Negative liquid crystal and chiral dopant form cholesteric liquid crystal with chirality, photoinitiator initiates liquid crystal monomer to polymerize under the irradiation of ultraviolet light or visible light to form polymer network, thereby forming polymer stable liquid crystal.
According to some embodiments of the present invention, the perovskite quantum dot polymer stabilized liquid crystal is mainly formed by mixing 1-3 parts by mass of perovskite quantum dots, 0.01-5 parts by mass of chiral dopant, 80-90 parts by mass of negative liquid crystal, 1-5 parts by mass of liquid crystal monomer and 0.01-1 part by mass of photoinitiator.
According to some embodiments of the invention, the thickness of the resonator unit is 5-30 μm.
According to some embodiments of the invention, the laser body has a thickness of 1.4-2.2 cm.
According to some embodiments of the invention, the first light-transmissive electrically-conductive layer is provided with a first parallel alignment layer at a side close to the resonator unit, and the second light-transmissive electrically-conductive layer is provided with a second parallel alignment layer at a side close to the resonator unit. The first and second parallel alignment layers have the same alignment direction. The polymer-stabilized liquid crystal in the resonator unit is aligned in a specific direction by the first and second parallel alignment layers.
According to some embodiments of the present invention, the laser main body further includes a spacing module, and the spacing module is respectively abutted against the first light-transmitting conductive layer and the second light-transmitting conductive layer to form an accommodating space for accommodating the resonant cavity unit.
According to some embodiments of the present invention, the spacer module is mainly made of a thickness control adhesive composition, the thickness control adhesive composition includes a spacer and an ultraviolet curing adhesive, and finally forms the spacer and a curing adhesive layer coated on the surface of the spacer.
According to some embodiments of the present invention, the thickness control paste composition includes 0.5 to 2 parts by mass of the spacer and 95 to 100 parts by mass of the ultraviolet curing paste.
According to some embodiments of the invention, the laser further comprises a pump source for providing pump energy to the laser body.
A method of making a polymer stabilized liquid crystal laser according to an embodiment of the second aspect of the invention comprises the steps of:
the method comprises the following steps: arranging the first light-transmitting conductive layer and the second light-transmitting conductive layer in parallel relatively to prepare a liquid crystal box;
step two: filling perovskite quantum dot polymer stable liquid crystal into the liquid crystal box to form a resonant cavity unit;
step three: and after the liquid crystal box is solidified by ultraviolet light, a polymer stabilized liquid crystal laser is formed.
The preparation method of the polymer stabilized liquid crystal laser provided by the embodiment of the invention has at least the following beneficial effects:
in the polymer stabilized liquid crystal laser prepared by the preparation method provided by the embodiment of the invention, the perovskite quantum dots in the perovskite quantum dot polymer stabilized liquid crystal have higher fluorescence quantum yield which can reach 50-100%. The extremely high fluorescence quantum yield makes it easier to generate ASE and, correspondingly, lasing, which further results in a higher emission intensity and a lower lasing threshold for the laser.
According to some embodiments of the invention, in step two, the perovskite quantum dot polymer stabilized liquid crystal is prepared by the following method:
blending and stirring negative liquid crystal, chiral dopant, liquid crystal monomer and photoinitiator to obtain polymer stable liquid crystal;
and mixing the perovskite quantum dots and the polymer stable liquid crystal, ultrasonically dispersing for 10-60 min, and mechanically stirring for 1-3 h to obtain the perovskite quantum dot polymer stable liquid crystal.
An apparatus according to an embodiment of the third aspect of the invention comprises a polymer stabilized liquid crystal laser as described above. The device can be a device using the laser in the fields of photonic integration, optical fiber communication, biological detection and optical sensing, such as an optical device, and the polymer stabilized liquid crystal laser is used as a light source.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The invention is further described with reference to the following figures and examples, in which:
FIG. 1 is a schematic structural diagram of a polymer stabilized liquid crystal laser according to an embodiment of the present invention;
fig. 2 to 4 are schematic diagrams of light input and output of the laser body of the polymer stabilized liquid crystal laser according to the embodiment of the present invention at different voltages.
Reference numerals: the laser comprises a first light-transmitting conductive layer 110, a first parallel alignment layer 120, a resonant cavity unit 130, a second parallel alignment layer 140, a second light-transmitting conductive layer 150, a power supply 160, a spacing module 170, a pump pulse laser 210, an emergent laser 220, cholesteric liquid crystals 231, a polymer network 232, first perovskite quantum dots 241, second perovskite quantum dots 242 and third perovskite quantum dots 243.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality is one or more, the meaning of a plurality is two or more, and the above, below, exceeding, etc. are understood as excluding the present numbers, and the above, below, within, etc. are understood as including the present numbers. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
In the description of the present invention, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In describing the present invention, a polymer stabilized liquid crystal laser is provided that includes a pump source and a laser body. Referring to fig. 1, the laser body includes a first light-transmissive conductive layer 110, a resonant cavity unit 130, and a second light-transmissive conductive layer 150, and the resonant cavity unit 130 is filled with a perovskite quantum dot polymer-stabilized liquid crystal. The pump source generates pump energy, the pump energy enters the resonant cavity unit 130 from the first light-transmitting conductive layer 110, and then the perovskite quantum dots in the polymer stabilized liquid crystal are excited to generate ASE, the radiation light of the ASE is overlapped with the reflection wave band of the polymer stabilized liquid crystal, the radiation light of the ASE is continuously reflected by the polymer stabilized liquid crystal, the reflected light further excites the perovskite quantum dots to generate stimulated radiation, and therefore light gain is achieved, when the generated light gain is larger than loss caused by refraction and reflection, laser emission can be achieved through the second light-transmitting conductive layer 150. The fluorescence quantum yield of the perovskite quantum dots is usually 50-100%, and the higher fluorescence quantum yield enables ASE to be generated in the resonant cavity unit 130 more easily, and laser emission is generated more easily, so that higher emission intensity and lower laser threshold are further caused.
In some embodiments of the invention, the perovskite quantum dots in the perovskite quantum dot polymer stabilized liquid crystal have at least two different luminescence bands. Due to the adjustability of the pitch of the polymer stabilized liquid crystal, after voltage is applied to the polymer stabilized liquid crystal, free impurity cations in the polymer stabilized liquid crystal can drive a polymer network to move, so that the spiral structure of the cholesteric liquid crystal is driven to deform, and a pitch gradient is formed, so that laser emission can be respectively realized by perovskite quantum dots with different light-emitting wave bands along with the change of photon forbidden bands, and a laser obtains a color changing effect.
In some embodiments of the present invention, the first parallel alignment layer 120 is disposed on a side of the first light-transmitting conductive layer 110 close to the resonant cavity unit 130, and the second parallel alignment layer 140 is disposed on a side of the second light-transmitting conductive layer 150 close to the resonant cavity unit 130. The first and second parallel alignment layers 120 and 140 may be made of a raw material such as a polyvinyl alcohol solution.
In some embodiments of the present invention, the first light-transmitting conductive layer 110 and the second light-transmitting conductive layer 140 are respectively connected to two poles of a power supply 160, and a voltage is applied to or changed from two sides of the resonant cavity unit 130 by the power supply 160, so that free impurity cations in the polymer stabilized liquid crystal can drive the polymer network to move, the cholesteric liquid crystal forms a pitch gradient or the pitch gradient changes, and the photon forbidden band changes accordingly, so that perovskite quantum dots with different light-emitting bands can be respectively emitted along with the change of the photon forbidden band, and the laser realizes a color change effect.
In some embodiments of the present invention, the laser body further comprises a spacer module 170, and the spacer module 170 is mainly made of a thickness control adhesive composition, wherein the thickness control adhesive composition comprises a silica gel spacer and a raw material of an ultraviolet light curing adhesive. The silica gel spacer is cured by ultraviolet light curing glue to form a core layer of the spacer and a cured glue layer coating the core layer, an accommodating space is formed between the first transparent conductive layer 110 and the second transparent conductive layer 150 so as to facilitate subsequent filling of perovskite quantum dot cholesteric liquid crystal, and the distance between the first transparent conductive layer 110 and the second transparent conductive layer 150 (the thickness of the resonant cavity unit 130) is controlled by the silica gel spacer of the spacer module 170. The thickness of the resonator unit 130 is generally 5 to 30 μm under the control of the spacing module 170, and the thickness of the laser body is 1.4 to 2.2 cm.
The preparation method of the polymer stabilized liquid crystal laser comprises the following steps:
(1) under the condition of yellow light, 87.45 parts by mass of negative liquid crystal HNG-30400-200, 3.55 parts by mass of chiral dopant R5011, 5 parts by mass of liquid crystal monomer HCM-009 and 1 part by mass of photoinitiator IRG651 (benzoin dimethyl ether) are respectively taken and stirred uniformly in a brown bottle at the temperature of 60 ℃ to prepare polymer stable liquid crystal.
(2) Respectively taking 1 part by mass of CsPbCl3、CsPbBr3And CsPbI3And adding the quantum dots into the prepared polymer stable liquid crystal at normal temperature, and mechanically stirring for 3 hours after carrying out ultrasonic treatment for 1 hour at normal temperature to obtain the perovskite quantum dot polymer stable liquid crystal.
(3) Taking a clean and light-transmitting ITO substrate (indium tin oxide conductive glass), coating 5 parts by mass of a polyvinyl alcohol aqueous solution, steaming for 1h at 60 ℃, cooling to normal temperature, and rubbing the transparent substrate coated with the polyvinyl alcohol aqueous solution along one direction by using a velvet to form a parallel orientation structure.
(4) Taking an ITO substrate forming a parallel orientation structure, dispensing glue on the periphery of the ITO substrate by using a thickness control glue composition (formed by mixing 1 part by mass of silica gel spacers and 99 parts by mass of ultraviolet curing glue), taking another ITO substrate forming the parallel orientation structure, arranging the other ITO substrate opposite to the dispensed ITO substrate to form a liquid crystal box, filling the prepared perovskite quantum dot polymer liquid crystal mixture into the liquid crystal box on a 60 ℃ hot table, and curing the liquid crystal box filled with the mixed liquid crystal under the ultraviolet light condition to form the polymer stabilized liquid crystal laser.
Under the condition that the voltage applied by the power supply 160 at one end of the resonant cavity unit 130 is 0 and no pump source is stimulated, the perovskite quantum dots in the perovskite quantum dot polymer stabilized liquid crystal generate spontaneous radiation, each electron at a high energy level in the quantum dots transits to a low energy level, and releases one photon, the spontaneous radiation generates polarized light, however, the wavelength of the spontaneous radiation polarized light is just in a photon forbidden band of cholesteric liquid crystal in the perovskite quantum dot polymer stabilized liquid crystal, the photon density is almost zero, and the spontaneous radiation is continuously reflected until the energy is lost.
Referring to fig. 2, it is a schematic diagram of light entering and exiting from the laser body of the polymer stabilized liquid crystal laser according to the embodiment of the present invention when the voltage of the power supply 160 is 0V. The pumping source emits pumping light to the laser main body, the pumping light is pumping pulse laser 210, the pumping pulse laser 210 enters the resonant cavity unit 130 through the first light-transmitting conductive layer 110 and the first parallel alignment layer 120, cholesteric liquid crystal 231 and a polymer network 232 appear after photocuring in the resonant cavity unit 130, the cholesteric liquid crystal 231 is formed by negative liquid crystal and chiral dopant, and the polymer network 232 is formed by liquid crystal monomers, photoinitiator and illumination. Under the action of the first parallel orientation layer 120 and the second parallel orientation layer 140, the cholesteric liquid crystal 231 forms a cholesteric structure and a specific pitch parallel to the two sides, after the pump pulse laser 210 enters the resonant cavity unit 130, the first perovskite quantum dot 241, the second perovskite quantum dot 242 and the third perovskite quantum dot 243 are subjected to stimulated absorption, and the energy supplied by the electron absorption pump source at the low energy level is transited to the high energy level, so that the population inversion is generated, and the ASE is further realized. At this time, the band of the spontaneous emission of the first perovskite quantum dot 241 generated by the pump pulse laser 210 is located at the edge of the photon forbidden band of the cholesteric liquid crystal 231, the photon density is maximum, the emission light generated by the ASE is continuously reflected by the cholesteric liquid crystal 231, and the first perovskite quantum dot 24 is further excited1, excited radiation is generated, so that a larger optical gain is realized, and when the generated optical gain is larger than the loss caused by reflection and refraction, laser in the wave band of the first perovskite quantum dot 241 emits outgoing laser 220 outwards through the second parallel orientation layer 140 and the second light-transmitting conducting layer 150. Meanwhile, the second perovskite quantum dot 242 and the third perovskite quantum dot 243 have almost zero photon density because the wave band of the spontaneous radiation generated by the pumping pulse laser 210 is within the photon forbidden band of the cholesteric liquid crystal 231, so that the light generated by the spontaneous radiation is gradually consumed in the continuous reflection process in the resonant cavity unit 130, and finally the light cannot be emitted outwards by the second light-transmitting conductive layer 150. Downward arrows near the first perovskite quantum dot 241, the second perovskite quantum dot 242 and the third perovskite quantum dot 243 indicate whether the spontaneous radiation of the perovskite quantum dot can be emitted from the second light-transmitting conductive layer 150, one arrow indicates that the spontaneous radiation is generated but the light cannot be emitted, and the three arrows indicate that the generated spontaneous radiation can be emitted. The first perovskite quantum dot 241 is CsPbCl3And finally, the band edge laser emission of blue light is realized.
At this time, the voltage of the power supply 160 is adjusted to be changed from 0V to 10V, so that the voltages at two sides of the resonant cavity unit 130 are changed, referring to fig. 3, in this process, free impurity cations in the polymer stabilized liquid crystal can drive the polymer network 232 to move, and further drive the spiral of the cholesteric liquid crystal 231 to deform, and the pitch gradient changes, so that the band of the spontaneous radiation generated by the first perovskite quantum dot 241 and the third perovskite quantum dot 243 due to the pumping pulse laser 210 is in the photon forbidden band of the cholesteric liquid crystal 231 after the pitch gradient changes, the photon density is almost zero, the band of the spontaneous radiation of the second perovskite quantum dot 242 is at the photon forbidden band edge of the cholesteric liquid crystal 231, and the photon density is a maximum value. Therefore, the light generated by the spontaneous radiation of the first perovskite quantum dot 241 and the third perovskite quantum dot 243 is gradually consumed in the continuous reflection process in the resonant cavity 130, and thus the light cannot be emitted; the light generated by the spontaneous radiation of the second perovskite quantum dot 242 realizes stronger ASE in the continuous reflection process under the action of the cholesteric liquid crystal 231 after the pitch gradient is changed, the stimulated radiation and stronger optical gain are realized, and when the generated optical gain is realizedGreater than the optical loss, to realize laser emission. The second perovskite quantum dot 242 is CsPbBr3And finally, the band edge laser emitting of green light is realized.
Further, the voltage of the power supply 160 is adjusted to be changed from 10V to 20V, so that the voltages at the two sides of the resonant cavity unit 130 are changed, referring to fig. 4, in this process, free impurity cations in the polymer stabilized liquid crystal further drive the polymer network 232 to move, so that the pitch gradient is changed greatly, the band of the spontaneous radiation generated by the first perovskite quantum dot 241 and the second perovskite quantum dot 242 due to the pump pulse laser 210 is in the photon forbidden band of the cholesteric liquid crystal 231 after the pitch gradient is changed, the photon density is almost zero, the band of the spontaneous radiation of the third perovskite quantum dot 243 is at the edge of the photon forbidden band of the cholesteric liquid crystal 231, and the photon density is maximum. Therefore, light generated by spontaneous radiation of the first perovskite quantum dot 241 and the second perovskite quantum dot 242 is gradually consumed in the continuous reflection process in the resonant cavity 130, and light cannot be emitted; the light generated by the spontaneous radiation of the tricalcium titanium ore quantum dots 243 realizes stronger ASE and optical gain in the continuous reflection process under the action of the cholesteric liquid crystal 231 after the pitch gradient is changed, and when the generated optical gain is larger than the optical loss, the laser emission is realized. The second perovskite quantum dot 242 is CsPbI3And finally, band edge laser emission of red light is realized.
In summary, the voltage at the two sides of the resonant cavity unit 130 is adjusted by the power supply 160, so that the polymer stabilized liquid crystal laser can obtain the laser light emitting effect of different bands under different applied voltages. The device manufactured by using the polymer stabilized liquid crystal laser has good application prospect in the fields of photonic integration, optical fiber communication, biological detection and optical sensing.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention. Furthermore, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.
Claims (10)
1. A polymer stabilized liquid crystal laser comprising a laser body, the laser body comprising:
a first light-transmitting conductive layer;
the second light-transmitting conductive layer is arranged opposite to the first light-transmitting conductive layer;
and the resonant cavity unit is positioned between the first light-transmitting conducting layer and the second light-transmitting conducting layer, and perovskite quantum dot polymer stable liquid crystal is filled in the resonant cavity unit.
2. The polymer stabilized liquid crystal laser of claim 1, wherein the perovskite quantum dot polymer stabilized liquid crystal is CsPbX3Perovskite quantum dot polymer stabilized liquid crystal, wherein X is Cl or ClmBr3-m、Br、BrmI3-mAt least one of I and I, 0<m<3。
3. The polymer stabilized liquid crystal laser of claim 1, wherein there are at least two perovskite quantum dots in the perovskite quantum dot polymer stabilized liquid crystal, the at least two perovskite quantum dots having different emission bands.
4. The polymer stabilized liquid crystal laser according to claim 1, wherein the polymer stabilized liquid crystal in the perovskite quantum dot polymer stabilized liquid crystal is mainly formed by mixing raw materials of a negative liquid crystal, a chiral dopant, a liquid crystal monomer and a photoinitiator;
preferably, the perovskite quantum dot polymer stabilized liquid crystal is mainly prepared by mixing 1-3 parts by mass of perovskite quantum dots, 0.01-5 parts by mass of chiral dopant, 80-90 parts by mass of negative liquid crystal, 1-5 parts by mass of liquid crystal monomer and 0.01-1 part by mass of photoinitiator.
5. The polymer stabilized liquid crystal laser according to claim 1, wherein the thickness of the resonator unit is 5 to 30 μm.
6. The polymer stabilized liquid crystal laser of claim 1, wherein the thickness of the laser body is 1.4-2.2 cm.
7. The polymer stabilized liquid crystal laser of claim 1, wherein said first light transmissive conductive layer is provided with a first parallel alignment layer on a side adjacent to said resonator cell, and said second light transmissive conductive layer is provided with a second parallel alignment layer on a side adjacent to said resonator cell.
8. The polymer stabilized liquid crystal laser according to claim 1, wherein the laser main body further comprises a spacing module, the spacing module abuts against the first light-transmitting conductive layer and the second light-transmitting conductive layer respectively to form an accommodating space, and the accommodating space is used for accommodating the resonant cavity unit;
preferably, the spacer module is mainly made of a thickness control adhesive composition, and the thickness control adhesive composition comprises a spacer and an ultraviolet curing adhesive;
preferably, the thickness control adhesive composition comprises 0.5-2 parts by mass of the spacer and 95-100 parts by mass of the ultraviolet curing adhesive.
9. A method of making a polymer stabilized liquid crystal laser according to any of claims 1 to 8, comprising the steps of:
the method comprises the following steps: arranging the first light-transmitting conductive layer and the second light-transmitting conductive layer in parallel relatively to prepare a liquid crystal box;
step two: filling perovskite quantum dot polymer stable liquid crystal into the liquid crystal box to form a resonant cavity unit;
step three: and after the liquid crystal box is solidified by ultraviolet light, a polymer stabilized liquid crystal laser is formed.
Preferably, in the second step, the preparation method of the perovskite quantum dot polymer stabilized liquid crystal is as follows:
blending and stirring negative liquid crystal, chiral dopant, liquid crystal monomer and photoinitiator to obtain polymer stable liquid crystal;
and mixing the perovskite quantum dots with the polymer stable liquid crystal, ultrasonically dispersing for 10-60 min, and mechanically stirring for 1-3 h to obtain the perovskite quantum dot polymer stable liquid crystal.
10. A device comprising a polymer stabilized liquid crystal laser according to any of claims 1 to 8.
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| CN108011292A (en) * | 2017-10-27 | 2018-05-08 | 北京理工大学 | Colloidal Quantum Dots continuous wave laser and preparation method thereof |
| CN109066285B (en) * | 2018-07-25 | 2020-10-02 | 合肥工业大学 | Wide-range continuously adjustable electric control optical pumping liquid crystal laser device and preparation method thereof |
| CN110643373B (en) * | 2019-09-04 | 2023-06-13 | 五邑大学 | Perovskite quantum dot doped polymer dispersed liquid crystal and preparation method and application thereof |
| CN110932083B (en) * | 2019-11-25 | 2021-08-17 | 五邑大学 | Semiconductor quantum dot doped polymer dispersed liquid crystal containing Ag nano particles |
| CN111048976A (en) * | 2020-01-09 | 2020-04-21 | 曲阜师范大学 | Inorganic perovskite quantum dot distributed feedback laser |
-
2020
- 2020-12-31 CN CN202011640897.6A patent/CN112909719A/en active Pending
-
2021
- 2021-05-27 WO PCT/CN2021/096283 patent/WO2022142103A1/en active Application Filing
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| Publication number | Publication date |
|---|---|
| WO2022142103A1 (en) | 2022-07-07 |
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