CN214255052U - Polymer stabilized liquid crystal laser and device - Google Patents
Polymer stabilized liquid crystal laser and device Download PDFInfo
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- CN214255052U CN214255052U CN202023352584.9U CN202023352584U CN214255052U CN 214255052 U CN214255052 U CN 214255052U CN 202023352584 U CN202023352584 U CN 202023352584U CN 214255052 U CN214255052 U CN 214255052U
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Abstract
The utility model discloses a liquid crystal laser and equipment are stabilized to polymer. 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 a perovskite quantum dot polymer stabilized liquid crystal layer is arranged in the resonant cavity unit. According to the utility model discloses liquid crystal laser is stabilized to polymer has following beneficial effect at least: 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 utility model relates to a laser instrument technical field especially relates to polymer stabilized liquid crystal laser and equipment.
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.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a low, the high polymer of emission intensity of laser threshold value stabilizes liquid crystal laser and equipment.
According to the utility model discloses a polymer stabilized liquid crystal laser of first aspect embodiment, this polymer stabilized liquid crystal laser includes the laser instrument main part, and the laser instrument main part includes:
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 a perovskite quantum dot polymer stabilized liquid crystal layer is arranged in the resonant cavity unit.
According to the utility model discloses liquid crystal laser is stabilized to polymer has following beneficial effect at least:
when the utility model discloses perovskite quantum dot among the polymer stabilized liquid crystal laser just has the overlap with the reflection wave band of polymer stabilized liquid crystal because of the optical wavelength of the enlarged spontaneous emission (ASE) that the pump source arouses, the light that the enlarged spontaneous emission produced will be constantly reflected by polymer stabilized liquid crystal, the reverberation further arouses perovskite quantum dot to produce stimulated radiation, and then constantly realize optical gain, optical gain when producing is greater than the loss that light caused because of reflection and refraction on the way of propagating, can realize laser outgoing. The perovskite quantum dots in the perovskite quantum dot polymer stabilized liquid crystal layer 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 layer is an all-inorganic perovskite quantum dot polymer stabilized liquid crystal layer.
According to some embodiments of the invention, the all-inorganic perovskite quantum dot polymer stabilized liquid crystal layer is CsPbX3The perovskite quantum dot polymer stabilizes the liquid crystal layer. 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 inventionThe perovskite quantum dot polymer stabilized liquid crystal layer is provided with at least two perovskite quantum dots, and different perovskite quantum dots have different light-emitting wave bands. Due to the adjustability of the screw 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, and further the spiral structure of the cholesteric liquid crystal is driven to deform, so that screw pitch gradient or screw pitch gradient is formed to change, the photon forbidden band is changed, and therefore laser emission can be respectively realized along with the change of the photon forbidden band by the perovskite quantum dots with different light-emitting wave bands, and the color changing effect of a laser is realized. 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 invention, the thickness of the resonator unit is 5 to 30 μm.
According to some embodiments of the utility model, the thickness of laser instrument main part is 1.4 ~ 2.2 cm.
According to some embodiments of the present invention, the first light-transmitting conductive layer is provided with a first parallel alignment layer on a side close to the resonator unit, and the second light-transmitting conductive layer is provided with a second parallel alignment layer on 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 utility model, the laser instrument main part still includes the interval module, and the interval module supports respectively with first printing opacity conducting layer and second printing opacity conducting layer and holds and form the accommodation space, and the accommodation space is used for holding resonant cavity unit.
According to some embodiments of the present invention, the spacer module is made of a thickness control adhesive composition, the thickness control adhesive composition including a spacer and an ultraviolet curing adhesive.
According to some embodiments of the present invention, the thickness control adhesive composition comprises 0.5 to 2 parts by mass of the spacer and 95 to 100 parts by mass of the ultraviolet curing adhesive.
According to some embodiments of the invention, the laser further comprises a pump source for providing pump energy to the laser body.
According to some embodiments of the invention, the pump source is a pulsed laser.
An apparatus according to an embodiment of the second 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 will be further described with reference to the following drawings 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 illustrating light entering and exiting from a laser main body of a polymer stabilized liquid crystal laser according to an embodiment of the present invention under different voltage conditions.
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 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 drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, 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, a plurality of means is one or more, a plurality of means is two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. 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 there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.
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" or the like 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.
The utility model discloses an in the description, provide a liquid crystal laser is stabilized to polymer, this liquid crystal laser is stabilized to polymer includes pumping source and laser instrument main part. 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, with a perovskite quantum dot polymer stabilized liquid crystal layer within the resonant cavity unit 130. The pump source generates pump light, the pump light enters the resonant cavity unit 130 from the first light-transmitting conductive layer 110, perovskite quantum dots in the perovskite quantum dot polymer stabilized liquid crystal layer are further excited to generate ASE, the radiation light of the ASE is overlapped with the reflection wave band of the perovskite quantum dot polymer stabilized liquid crystal layer, the radiation light of the ASE is continuously reflected by the perovskite quantum dot polymer stabilized liquid crystal layer, 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 emitting 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 layer have at least two different light emission 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, a 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 a 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 transparent conductive layer 110 and the second transparent conductive layer 140 are respectively connected to two electrodes of the power source 160, the power source 160 applies voltage to the two sides of the resonant cavity unit 130 or changes the voltage of the two sides, free impurity cations in the stable liquid crystal layer of the perovskite quantum dot polymer can drive the polymer network to move, cholesteric liquid crystal forms a pitch gradient or a pitch gradient to change, the photon forbidden band is changed accordingly, thereby the perovskite quantum dots with different light-emitting bands can be emitted along with the change of the photon forbidden band, and the laser realizes the color-changing effect.
In some embodiments of the present invention, the laser main body further comprises a spacer module 170, the spacer module 170 is mainly made of a thickness control adhesive composition, and 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 the ultraviolet light curing adhesive to form a core layer of the spacer and a cured adhesive 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 the perovskite quantum dot polymer stabilized liquid crystal layer, 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. The thickness of the laser main body is 1.4-2.2 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 ITO substrate opposite to the glue-dispensed ITO substrate to form a liquid crystal box, filling the prepared perovskite quantum dot polymer stable liquid crystal mixture into the liquid crystal box on a hot table at 60 ℃, and then curing the liquid crystal box filled with the mixed liquid crystal under the ultraviolet light condition to form the polymer stable 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 layer 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 polarized light of the spontaneous radiation 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 polarized light is continuously reflected until the energy is lost.
Referring to fig. 2, it is a schematic diagram of the light entering and exiting from the laser main 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. The cholesteric liquid crystal 231 forms a cholesteric structure parallel to both sides by the first and second parallel alignment layers 120 and 140And a specific pitch, 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 stimulated and absorbed, and the electrons at the low energy level absorb the energy supplied by the pump source to jump to the high energy level, and thus the population inversion is generated. At this time, the wavelength band of the spontaneous radiation of the first perovskite quantum dot 241 generated by the pump pulse laser 210 is located at the photon forbidden band edge of the cholesteric liquid crystal 231, the photon density is a maximum value, the light generated by the spontaneous radiation is continuously reflected by the cholesteric liquid crystal 231, and after further exciting the first perovskite quantum dot 241 to generate more spontaneous radiation, ASE is realized, and when the generated light is larger than the energy consumed by the reflected light, the laser of the wavelength band of the first perovskite quantum dot 241 emits the outgoing laser 220 outwards through the second parallel alignment layer 140 and the second light-transmitting conductive 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 from 0V to 10V, so that the voltages at the two sides of the resonant cavity unit 130 change, referring to fig. 3, in this process, the free impurity cations in the polymer stabilized liquid crystal can drive the polymer network 232 to move, and further drive the helix of the cholesteric liquid crystal 231 to deform, and the pitch gradient changes. The first perovskite quantum dot 241 and the third perovskite quantum dot 243 have photon forbidden bands of spontaneous radiation generated by the pump pulse laser 210 in the cholesteric liquid crystal 231 after the pitch gradient is changedIn the interior, the photon density is almost zero, the band of the spontaneous radiation of the second perovskite quantum dot 242 is at the edge of the photon forbidden band of the cholesteric liquid crystal 231, and the photon density is maximum. 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, so that the light cannot be emitted; the light generated by the spontaneous emission of the second perovskite quantum dot 242 realizes ASE in the continuous reflection process under the action of the cholesteric liquid crystal 231 after the pitch gradient is changed, and when the generated light is larger than the energy consumed by the reflected light, the laser emission is realized. 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 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, the free impurity cations in the polymer stabilized liquid crystal further drive the polymer network 232 to move, so that the pitch gradient is changed more greatly. The wave 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 wave 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 ASE in the continuous reflection process under the action of the cholesteric liquid crystal 231 after the pitch gradient is changed, and when the generated light is more than the energy consumed by reflected light, 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 without departing from the spirit of the present invention within the knowledge of those skilled in the art. Furthermore, the embodiments of the present invention and 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 a perovskite quantum dot polymer stabilized liquid crystal layer is arranged in the resonant cavity unit.
2. The polymer stabilized liquid crystal laser of claim 1, wherein the perovskite quantum dot polymer stabilized liquid crystal layer is an all inorganic perovskite quantum dot polymer stabilized liquid crystal layer.
3. 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.
4. 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.
5. The polymer stabilized liquid crystal laser of claim 4, wherein the spacer module comprises a spacer and a layer of cured glue coating a surface of the spacer.
6. The polymer stabilized liquid crystal laser according to claim 1, wherein the thickness of the resonator unit is 5 to 30 μm.
7. The polymer stabilized liquid crystal laser of claim 1, wherein the thickness of the laser body is 1.4-2.2 cm.
8. The polymer stabilized liquid crystal laser according to any one of claims 1 to 7, further comprising a pump source for providing pump light to the laser body.
9. The polymer stabilized liquid crystal laser of claim 8, wherein the pump source is a pulsed laser.
10. A device comprising a polymer stabilized liquid crystal laser according to any of claims 1 to 9.
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| CN202023352584.9U CN214255052U (en) | 2020-12-31 | 2020-12-31 | Polymer stabilized liquid crystal laser and device |
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| CN202023352584.9U CN214255052U (en) | 2020-12-31 | 2020-12-31 | Polymer stabilized liquid crystal laser and device |
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