Intrinsically polarized light detector and preparation method thereof

Abstract

The present invention relates to an intrinsically polarized light detector comprising an optically active layer comprising a blended structure of a polymer donor and a small molecule acceptor, wherein the optically active layer exhibits anisotropy. The disclosed intrinsically polarized light detector based on a non-fullerene organic conjugated small molecule achieves simultaneous directional alignment of the polymer donor and the non-fullerene organic conjugated small molecule acceptor in the blended film, achieving optical anisotropy within their respective absorption spectrum bands. This enables the intrinsically polarized light detector to detect polarized light within the absorption spectrum bands of the two, filling a current research gap. Furthermore, the detector has the advantages of a simple structure, easy preparation, tunable response light, low energy consumption, room-temperature operation, and low cost, and holds great promise for future applications in complex, compact, integrated, and space-based detection and imaging systems.

Description

Technical Field

[0001] The present invention belongs to the field of polarized light detectors, and in particular relates to an intrinsic polarized light detector and a preparation method thereof. Background Art

[0002] In addition to identifying the intensity and wavelength of light waves, polarization detection technology can also obtain information about the polarization state, thereby adding four additional characteristic quantities: polarization angle, polarization azimuth, ellipticity, and rotation direction. This technology expands the signal detection dimensionality through a transformation of the detection mechanism, achieving a breakthrough in signal resolution. Polarization detection imaging technology can be used to discern material geometry, roughness, porosity, water content, conductivity, relative distance, and observation angle, enabling precise observation and seeing the invisible. Traditional polarization-sensitive photodetectors are cascaded components consisting of conventional photodetectors and polarization optical elements. Their complex structure, discrete components, and cumbersome operation hinder the development of miniaturized, modular, and highly integrated photodetectors. In contrast, intrinsic polarization-sensitive photodetectors utilize polarization-sensitive semiconductor films to achieve polarization response. This simplified structure eliminates the need for designing and fabricating any additional micro- and nano-optical structures, making them one of the preferred polarization-sensitive photodetector architectures.

[0003] Currently, only two types of intrinsic polarization-sensitive photodetectors based on organic conjugated structures have been developed. One is a bulk heterojunction in which the optically active layer is a full polymer; the other is a heterojunction in which the optically active layer is composed of a polymer and a fullerene derivative [6,6]-phenyl-C61-butyric acid isomethyl ester (PC 61 All-polymer organic optoelectronic devices have excellent device performance stability and mechanical properties, but their optoelectronic performance is still relatively backward, mainly due to the lack of high-performance polymer acceptor materials and the difficulty in controlling the micromorphology of the all-polymer photoactive layer.

[0004] Fullerene receptors are widely used in the preparation of organic optoelectronic devices. However, due to the poor tunability of fullerene receptor electronic energy levels, difficulty in chemical structure modification and purification, and high production costs, fullerene receptors are not ideal in practical applications. The anisotropic optical response of current intrinsic polarization-sensitive photodetectors mainly comes from the directional arrangement of polymers. Quasi-spherically symmetrical PC 61 The BM structure does not achieve directional alignment and therefore does not contribute any optical anisotropy in its absorption band.

[0005] In recent years, significant progress has been made in the research and development of non-fullerene organic conjugated small molecules. 61Unlike fullerene-based organic conjugated small molecules, their stripe-like structure with varying aspect ratios allows for anisotropic molecular structures. Furthermore, these molecules offer advantages such as easy chemical modification, a wide spectral absorption range, and ease of preparation. These advantages effectively overcome the shortcomings of fullerene-based receptor materials, making them a highly efficient active layer material for photodetectors.

[0006] However, the orientation of non-fullerene organic conjugated small molecules and their application in the field of polarized light detectors has not been proposed or realized.

[0007] Therefore, attempts to orient optically active layers based on non-fullerene organic conjugated small molecules to make them anisotropic remain an unexplored topic. Summary of the Invention

[0008] The intrinsic polarization light detector based on non-fullerene organic conjugated small molecules disclosed in the present invention realizes the simultaneous directional arrangement of the polymer donor and the non-fullerene organic conjugated small molecule acceptor in the blended film, and realizes optical anisotropy within the respective absorption spectral bands, so that the intrinsic polarization light detector can realize polarized light detection within the absorption spectral bands of the two, filling the current research gap; and has the advantages of simple structure, easy preparation, adjustable response light, low energy consumption, room temperature operation and low cost, and has great application prospects in future light, small, integrated, space-type complex detection and imaging systems.

[0009] An object of the present invention is to provide an intrinsic polarization light detector comprising an optically active layer,

[0010] in,

[0011] The optically active layer comprises a blended structure of a polymer donor and a small molecule acceptor,

[0012] The optically active layer has anisotropy.

[0013] Furthermore, the small molecule receptor is selected from non-fullerene structures.

[0014] The molecular structures of the small molecule receptors selected in the present invention all have long and short axes, and appear to be strips or rods from a visual perspective, that is, the length of the molecule along the X-axis is significantly greater than the length of the molecule along the Y-axis.

[0015] The donor and the acceptor in the optically active layer of the present invention both have a long-short axis structure, so that when subjected to an external oriented force, the molecules have an oriented order along the long axis.

[0016] Furthermore, the molecular structure of the polymer donor includes a structure containing one or more of the following structural units:

[0017]

[0018] in

[0019] R1-R6 are independently selected from hydrogen, an alkyl group with 1-40 carbon atoms, or an alkyl derivative with 1-40 carbon atoms;

[0020] One or more carbon atoms in the alkyl derivative are substituted by one or more of hydrogen atoms, oxygen atoms, alkenyl groups, alkynyl groups, aryl groups, hydroxyl groups, amino groups, carbonyl groups, carboxyl groups, ester groups, cyano groups, and nitro groups;

[0021] and / or,

[0022] One or more hydrogen atoms on the alkyl derivative are replaced by one or more of fluorine atoms, chlorine atoms, bromine atoms, and iodine atoms;

[0023] The X1 and X2 are independently selected from one or more of a hydrogen atom, a fluorine atom, a chlorine atom, a cyano group, and a nitro group.

[0024] Furthermore, the molecular structure of the small molecule receptor includes a structure containing one or more of the following structural units:

[0025]

[0026] in,

[0027] R1-R6 are independently selected from hydrogen, an alkyl group with 1-40 carbon atoms, or an alkyl derivative with 1-40 carbon atoms;

[0028] One or more carbon atoms in the alkyl derivative are substituted by one or more of hydrogen atoms, oxygen atoms, alkenyl groups, alkynyl groups, aryl groups, hydroxyl groups, amino groups, carbonyl groups, carboxyl groups, ester groups, cyano groups, and nitro groups;

[0029] and / or,

[0030] One or more hydrogen atoms on the alkyl derivative are replaced by one or more of fluorine atoms, chlorine atoms, bromine atoms, and iodine atoms;

[0031] Said X1-X6 are independently selected from one or more of hydrogen atom, fluorine atom, chlorine atom, cyano group and nitro group.

[0032] Furthermore, the absorption spectrum of the optically active layer has dichroism.

[0033] Furthermore, the structure of the intrinsic polarization light detector includes, from bottom to top, a substrate, a transparent electrode, an optically active layer, and a metal electrode.

[0034] Preferably, the transparent electrode may be, but is not limited to, at least one of metal, graphene, carbon nanotube, silver nanowire, indium tin oxide (ITO), FTO, PEDOT:PSS, and polyaniline.

[0035] Furthermore, the structure of the intrinsic polarization light detector further includes one or two electron transport layers or hole transport layers.

[0036] Furthermore, the hole transport layer is at least one of PEDOT:PSS, MoO3, WO3, PVK, TPD, Spiro-TPD and NPD.

[0037] Furthermore, the electron transport layer is ZnO x 、TiO x 、PFN、PFN-Br、PC 61 BM, PC 71 At least one of BM, PEIE (polyethoxyethyleneimine) and PEI (polyetherimide).

[0038] Another object of the present invention is to provide a method for preparing the intrinsic polarization light detector, which includes an orientation method, wherein the orientation method enables the prepared optically active layer to have anisotropy.

[0039] Furthermore, the orientation method includes a floating film transfer method, a mechanical dragging method or a stretching orientation method.

[0040] Furthermore, the floating film transfer method comprises the following steps:

[0041] S1. Prepare a mixed solution of the donor and the acceptor, wherein the concentration of the mixed solution is 0.1 to 100 mg / mL;

[0042] S2. Place an appropriate amount of liquid matrix in a square culture dish and heat to a certain temperature, 30-100°C;

[0043] S3. Place a custom-made polytetrafluoroethylene slide in a square Petri dish so that half of its sloped surface is immersed in the liquid matrix.

[0044] S4. A drop of the mixed solution is dropped into the center of the slider. The mixed solution rapidly spreads and expands in the form of a ribbon, forming a ribbon-like film on the surface of the liquid matrix;

[0045] S5. Transferring the thin film from the liquid matrix surface to the substrate by transfer printing, and performing drying treatment to obtain an optically anisotropic optically active layer.

[0046] In step S2, the liquid matrix is ​​at least one of ethylene glycol, glycerol, and deionized water, or a mixture of two or three of them.

[0047] Furthermore, the mechanical dragging method comprises the following steps:

[0048] S1. Prepare a mixed solution of the donor and the acceptor, wherein the concentration of the mixed solution is 0.1 to 100 mg / mL;

[0049] S2. Spin-coating the mixed solution onto a clean substrate to obtain a blended film;

[0050] S3. Fix the substrate to the heating stage and wait until the substrate temperature and the heating stage temperature reach equilibrium;

[0051] S4. The blended film was rubbed several times in one direction by hand using a velvet cloth to obtain an optically anisotropic optically active layer.

[0052] Furthermore, the stretching orientation method comprises the following steps:

[0053] S1. Prepare a mixed solution of the donor and the acceptor, wherein the concentration of the mixed solution is 0.1 to 100 mg / mL;

[0054] S2. Spin-coat PEDOT:PSS onto a glass substrate and anneal it.

[0055] S3. In step S1, the mixed solution is spin-coated onto a PEDOT:PSS-coated glass substrate;

[0056] S4. The prepared film is laminated onto a polydimethylsiloxane (PDMS) plate;

[0057] S5. Immerse the PDMS / film composite in deionized water to dissolve the PEDOT:PSS layer, leaving a thin blend film on the PDMS plate.

[0058] S6. Connect the PDMS / film composite to a custom-made strain stage and apply uniaxial strain to it.

[0059] S7. Laminating the strained film to a substrate and removing the PDMS to obtain an optically anisotropic optically active layer.

[0060] The present invention has the following beneficial effects:

[0061] (1) The intrinsic polarization light detector based on the organic conjugated structure in the present invention realizes the simultaneous directional arrangement of the polymer donor and the non-fullerene organic conjugated small molecule acceptor in the blended film, and realizes optical anisotropy within the respective absorption spectrum bands, so that the detector can realize polarized light detection within the absorption spectrum bands of the two; the absorption spectrum of the optically active layer in the present invention has dichroism, and the absorption intensity of the optically active layer for linearly polarized light with a polarization direction parallel to the direction of the molecular transition dipole moment in the film is greater than the absorption intensity perpendicular to this direction.

[0062] (2) The intrinsic polarization light detector device containing rod-like organic conjugated small molecules in the present invention has a simple structure, is easy to prepare, has adjustable response light, low energy consumption, can operate at room temperature, and is low in cost. It has great application prospects in future light, small, integrated, and space-type complex detection and imaging systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Figure 1 The device structure of the intrinsic polarization light detector in Example 1 is shown.

[0064] Reference numerals: 1—silver electrode, 2—hole transport layer, 3—organic active layer, 4—electron transport layer, 5—ITO transparent electrode, 6—glass substrate.

[0065] Figure 2 The dependence of the response current of the polarized light detector on the polarization angle orientation of the linearly polarized light under irradiation of 532 nm linearly polarized light in Example 1 is shown.

[0066] Figure 3 The linear dynamic detection range of the polarization light detector in Example 1 is shown.

[0067] Figure 4 The specific steps of the floating film transfer method of Examples 1-3 and Comparative Examples 1-2 are shown, wherein the liquid matrix is ​​ethylene glycol:glycerol (1:1, v / v).

[0068] Figure 5 Specific steps of the mechanical dragging method of Example 4 are shown.

[0069] Figure 6 Specific steps of the stretching orientation method of Example 5 are shown.

[0070] Figure 7 (a)-(c) / Figure 7 (d)-(e) respectively show the thin film absorption spectra of the optically active layers of Examples 1-3 / Comparative Examples 1-2. DETAILED DESCRIPTION

[0071] In order to more clearly illustrate the technical solutions of the present invention, the following examples are given. Unless otherwise stated, the raw materials, reactions and post-processing methods mentioned in the examples are common raw materials on the market and technical methods well known to those skilled in the art.

[0072] The P3HT, TQ1, PC 71 The chemical structures of BM, Y6 and O-IDTBR are shown below:

[0073]

[0074] The deposition methods of the ITO transparent electrode, electron transport layer, hole transport layer and silver electrode of the specified thickness described in the embodiments and comparative examples of the present invention are conventional methods well known to those skilled in the art, and the methods are as follows:

[0075] The method for preparing the intrinsic polarization light detector comprises the following steps:

[0076] S1. Deposit an electron transport layer onto a clean, transparent ITO electrode.

[0077] S2. Transferring the optically active layer onto the electron transport layer by a solution method;

[0078] S3. Depositing a hole transport layer on the optically active layer by a solution method or vacuum evaporation method;

[0079] S4. Deposit metal on the hole transport layer by vacuum evaporation to complete the device.

[0080] Example 1

[0081] An intrinsically polarized light detector, whose device structure from bottom to top is: glass substrate (1.1mm) / ITO transparent electrode (180nm) / titanium dioxide electron transport layer (50nm) / optically active layer (P3HT:Y6, 3:1, m / m) (20nm) / molybdenum trioxide hole transport layer (15nm) / silver electrode (100nm). Figure 1 The device structure of the intrinsic polarization light detector in Example 1 is shown.

[0082] The preparation method of the intrinsic polarization light detector is as follows:

[0083] The optically active layer is prepared by a floating film transfer method, and the specific method is as follows:

[0084] S1. Dissolve the polymer P3HT and the organic conjugated small molecule Y6 in a 3:1 m / m mixture of chlorobenzene and chloroform (1:1 v / v) to a solute concentration of 25 mg / ml. Shake thoroughly and place at room temperature until ready for use.

[0085] S2. Place the liquid matrix ethylene glycol:glycerol (1:1, v / v) in a square Petri dish and heat to 60°C;

[0086] S3. Place the Teflon slide in a square Petri dish so that half of its slope is immersed in the liquid matrix.

[0087] S4. A drop of the mixed solution is dropped into the center of the slider, so that it slides to the junction of the liquid matrix surface and the slider, and rapidly spreads and expands in the form of a strip, forming a strip-shaped film on the surface of the liquid matrix;

[0088] S5. Transferring the strip-shaped film from the liquid matrix surface to the titanium dioxide electron transport layer by transfer printing, and drying the strip-shaped film to obtain an optically anisotropic optically active layer of a specified thickness.

[0089] Figure 2 The figure shows the dependence of the polarization detector's response current on the polarization angle orientation of linearly polarized light under 780nm linearly polarized light illumination in Example 1. The solid line is the fitted curve, which conforms to Malus's law. This demonstrates that the detector is sensitive to polarized light and exhibits intrinsic polarization sensitivity, meaning it can generate a polarization response to polarized light without the need for external optical components such as polarizers or gratings.

[0090] Figure 3 The linear dynamic range (LDR) of the polarized light detector in Example 1 is shown, indicating that the detector can maintain a linear light response over a wide range of light intensities over approximately 5 orders of magnitude.

[0091] Example 2

[0092] An intrinsically polarized light detector, whose device structure from bottom to top is: glass substrate (1.1mm) / ITO transparent electrode (180nm) / titanium dioxide electron transport layer (50nm) / optically active layer (TQ1:Y6, 3:1, m / m) (20nm) / molybdenum trioxide hole transport layer (15nm) / silver electrode (100nm).

[0093] The preparation method of the intrinsic polarization light detector is as follows:

[0094] The deposition methods of the obtained ITO transparent electrode, electron transport layer, hole transport layer and silver electrode of the above-mentioned specified thickness are conventional methods well known to those skilled in the art and will not be described in detail here.

[0095] The optically active layer is prepared by a floating film transfer method, and the specific method is as follows:

[0096] S1. Dissolve polymer TQ1 and organic conjugated small molecule Y6 in a 3:1 m / m mixture of chlorobenzene and chloroform (1:1 v / v) to a solute concentration of 25 mg / ml. Shake thoroughly and place at room temperature until ready to use.

[0097] S2. Place the liquid matrix ethylene glycol:glycerol (1:1, v / v) in a square Petri dish and heat to 60°C;

[0098] S3. Place the Teflon slide in a square Petri dish so that half of its slope is immersed in the liquid matrix.

[0099] S4. A drop of the mixed solution is dropped into the center of the slider, so that it slides to the junction of the liquid matrix surface and the slider, and rapidly spreads and expands in the form of a strip, forming a strip-shaped film on the surface of the liquid matrix;

[0100] S5. Transferring the strip-shaped film from the liquid matrix surface to the titanium dioxide electron transport layer by transfer printing, and drying the strip-shaped film to obtain an optically anisotropic optically active layer of a specified thickness.

[0101] Example 3

[0102] An intrinsically polarized light detector, whose device structure from bottom to top is: glass substrate (1.1 mm) / ITO transparent electrode (180 nm) / titanium dioxide electron transport layer (50 nm) / optically active layer (P3HT:O-IDTBR, 3:1, m / m) (20 nm) / molybdenum trioxide hole transport layer (15 nm) / silver electrode (100 nm).

[0103] The preparation method of the intrinsic polarization light detector is as follows:

[0104] The deposition methods of the obtained ITO transparent electrode, electron transport layer, hole transport layer and silver electrode of the above-mentioned specified thickness are conventional methods well known to those skilled in the art and will not be described in detail here.

[0105] The optically active layer is prepared by a floating film transfer method, and the specific method is as follows:

[0106] S1. The polymer P3HT and the organic conjugated small molecule O-IDTBR were blended (3:1, m / m) and dissolved in a chlorobenzene:chloroform (1:1, v / v) solvent mixture to ensure that the solute concentration in the mixed solution was 25 mg / ml. After sufficient shaking, the mixture was placed at room temperature until use.

[0107] S2. Place the liquid matrix ethylene glycol:glycerol (1:1, v / v) in a square Petri dish and heat to 60°C;

[0108] S3. Place the Teflon slide in a square Petri dish so that half of its slope is immersed in the liquid matrix.

[0109] S4. A drop of the mixed solution is dropped into the center of the slider, so that it slides to the junction of the liquid matrix surface and the slider, and rapidly spreads and expands in the form of a strip, forming a strip-shaped film on the surface of the liquid matrix;

[0110] S5. Transferring the strip-shaped film from the liquid matrix surface to the titanium dioxide electron transport layer by transfer printing, and drying the strip-shaped film to obtain an optically anisotropic optically active layer of a specified thickness.

[0111] Example 4

[0112] An intrinsically polarized light detector, whose device structure from bottom to top is: glass substrate (1.1mm) / ITO transparent electrode (180nm) / titanium dioxide electron transport layer (50nm) / optically active layer (P3HT:Y6, 3:1, m / m) (50nm) / molybdenum trioxide hole transport layer (15nm) / silver electrode (100nm). Figure 1 The device structure of the intrinsic polarization light detector in Example 1 is shown.

[0113] The preparation method of the intrinsic polarization light detector is as follows:

[0114] The optically active layer is prepared by a mechanical dragging method, and the specific method is as follows:

[0115] S1. Dissolve the polymer P3HT and the organic conjugated small molecule Y6 in a 3:1 m / m mixture of chlorobenzene and chloroform (1:1 v / v) to a solute concentration of 25 mg / ml. Shake thoroughly and place at room temperature until ready for use.

[0116] S2. The mixed solution was spin-coated (2000 rpm, 40 s) onto the titanium dioxide electron transport layer to obtain a blended film;

[0117] S3. Fix the substrate on a heating plate at a constant temperature of 180°C for 5 minutes until the substrate temperature and the heating plate temperature reach equilibrium;

[0118] S4. The blend film was rubbed four times in one direction by hand using a velvet cloth to obtain an optically anisotropic optically active layer of a specified thickness.

[0119] Example 5

[0120] An intrinsically polarized light detector, whose device structure from bottom to top is: glass substrate (1.1mm) / ITO transparent electrode (180nm) / titanium dioxide electron transport layer (50nm) / optically active layer (P3HT:Y6, 3:1, m / m) (50nm) / molybdenum trioxide hole transport layer (15nm) / silver electrode (100nm). Figure 1 The device structure of the intrinsic polarization light detector in Example 1 is shown.

[0121] The preparation method of the intrinsic polarization light detector is as follows:

[0122] The optically active layer is prepared by a stretching orientation method, and the specific method is as follows:

[0123] S1. Dissolve the polymer P3HT and the organic conjugated small molecule Y6 in a 3:1 m / m mixture of chlorobenzene and chloroform (1:1 v / v) to a solute concentration of 25 mg / ml. Shake thoroughly and place at room temperature until ready for use.

[0124] S2. PEDOT:PSS was spin-coated (3000 rpm, 40 s) onto a glass substrate and annealed (150°C, 10 min).

[0125] S3. The mixed solution described in step S1 was spin-coated (2000 rpm, 40 s) onto the PEDOT:PSS-coated glass substrate;

[0126] S4. The film prepared in step S3 is laminated onto a polydimethylsiloxane (PDMS) plate;

[0127] S5. Immerse the PDMS / film composite in deionized water to dissolve the PEDOT:PSS layer, leaving a thin blend film on the PDMS plate.

[0128] S6. Connect the PDMS / film composite to a custom-made strain stage and apply uniaxial strain to it.

[0129] S7. Laminating the strained film onto the titanium dioxide electron transport layer and removing the PDMS to obtain an optically anisotropic optically active layer of a specified thickness.

[0130] Comparative Example 1

[0131] The raw materials, device structure and preparation method used in Comparative Example 1 are the same as those in Example 1. The only difference is that the optical active layer in Comparative Example 1 is P3HT and PC. 71 The structure obtained after BM blending (3:1, m / m) and floating film transfer method.

[0132] Comparative Example 2

[0133] The raw materials, device structure and preparation method used in Comparative Example 2 are the same as those in Example 2. The only difference is that the optical active layer in Comparative Example 1 is TQ1 and PC 71 The structure obtained after BM blending (3:1, m / m) and floating film transfer method.

[0134] Figure 4 The specific steps of the floating film transfer method of Examples 1-3 and Comparative Examples 1-2 are shown.

[0135] Figure 5 Specific steps of the mechanical dragging method of Example 4 are shown.

[0136] Figure 6 Specific steps of the stretching orientation method of Example 5 are shown.

[0137] Test Example 1

[0138] The following tests were performed on the intrinsic polarization light detectors obtained in Examples 1-3 and Comparative Examples 1-2.

[0139] The specific testing method of the absorption spectrum is well known to those skilled in the art.

[0140] The dichroic ratio is tested by placing linear polarizers with the same polarization angle at the light outlets of the UV-2550 UV spectrophotometer's sample and reference chambers, respectively. After baseline calibration, the test is performed. The sample's absorption over a range of wavelengths at different polarization angles is measured. When the polarization direction is parallel to the film's self-assembly direction (defined as parallel), the absorption intensity reaches its maximum. However, when the polarization direction is rotated 90°, perpendicular to the film's self-assembly direction (defined as perpendicular), the absorption intensity reaches its minimum. This indicates that the film exhibits anisotropy in optical absorption, with a polarization effect on light absorption.

[0141] The order parameters are introduced to quantify the degree of orientation of the film's molecular structure. The formula for calculating the dichroic ratio (D) is:

[0142] D=A / / / A ⊥

[0143] A ∥ and A ⊥ They represent the absorption values ​​when the polarization direction of polarized light in the absorption spectrum is parallel and perpendicular to the self-assembly direction of the film, respectively. The degree of order O can be calculated based on the dichroic ratio D at the absorption peak wavelength, and its calculation formula is:

[0144] O=(D-1) / (D+2)

[0145] The order degree O value is calculated based on it. If the value is closer to 0, the isotropy of the film is higher; if the order degree O value is closer to 1, the anisotropy of the film is higher.

[0146] The thin film absorption spectra of the optically active layers of Examples 1-3 and Comparative Examples 1-2 are shown in FIG. Figure 7 (a)-(c) / Figure 7 As shown in (d)-(e). Figure 7 In (a)-(e), the solid line indicates the maximum absorption of linearly polarized light (polarization direction is parallel to the light), and the dotted line indicates the minimum absorption of linearly polarized light (polarization direction is perpendicular to the light).

[0147] The relevant data obtained are shown in Table 1.

[0148] Table 1 Test results of absorption spectra of intrinsic polarized light detectors obtained in Examples 1-3 and Comparative Examples 1-2

[0149]

[0150]

[0151] As can be seen from Table 1, the polymer and rod-like organic conjugated small molecule blend films of Examples 1-3 exhibit optical anisotropy within the absorption spectrum of the polymer and the organic conjugated small molecule, respectively, and exhibit high order values. This indicates that the organic conjugated small molecules achieve directional alignment in the blend films.

[0152] However, the polymer and fullerene small molecule blend films in Comparative Examples 1 and 2 have optical anisotropy only within the absorption spectrum band of the polymer. Therefore, the quasi-spherically symmetrical fullerene small molecules do not contribute any optical anisotropy. This indicates that the fullerene small molecules do not achieve directional arrangement in the blend films, resulting in a low order value of the blend films, that is, a low degree of anisotropy.

[0153] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

[0154] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. An intrinsic polarization light detector, characterized in that: The intrinsic polarization light detector comprises an optically active layer, in, The optically active layer comprises a blended structure of a polymer donor and a small molecule acceptor, The optically active layer has anisotropy; The small molecule receptor is selected from the non-fullerene structure Y6; The method for obtaining the anisotropy is selected from a floating film transfer method, a mechanical dragging method or a stretching orientation method; The polymer donor is P3HT.

2. The intrinsic polarization light detector according to claim 1, characterized in that: The absorption spectrum of the optically active layer has dichroism.

3. The intrinsic polarization light detector according to claim 1, characterized in that: The structure of the intrinsic polarization light detector comprises, from bottom to top, a substrate, a transparent electrode, an optically active layer, and a metal electrode.

4. The intrinsic polarization light detector according to claim 3, characterized in that: The structure of the intrinsic polarization light detector further includes one or two electron transport layers or hole transport layers.

5. The method for preparing the intrinsic polarization light detector according to any one of claims 1 to 4, characterized in that: The method for preparing the intrinsic polarization light detector includes an orientation method, and the orientation method enables the prepared optical active layer to have anisotropy.

6. The method for preparing the intrinsic polarization light detector according to claim 5, characterized in that: The orientation method includes a floating film transfer method, a mechanical dragging method or a stretching orientation method.

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