Preparation method and application of multi-responsive platinum complex luminescent film

Abstract

The present invention relates to the field of luminescent thin film materials, and in particular to a preparation method and application of a multi-responsive platinum complex luminescent thin film; wherein the preparation method of the multi-responsive platinum complex luminescent thin film comprises the following steps: (1) reacting a platinum complex precursor with 2,6-dimethylbenzene isocyanide to prepare a platinum complex, and recrystallizing the platinum complex in a chloroform solution to obtain a platinum complex; (2) dissolving the platinum complex in a good solvent S1 to obtain a platinum complex solution; (3) dissolving a high molecular weight polymer in a good solvent S2 to obtain a high molecular weight polymer solution; (4) mixing the platinum complex solution and the high molecular weight polymer solution to obtain a composite solution; (5) dripping the composite solution into an evaporating dish, casting and leveling the solution to obtain a platinum complex luminescent thin film. The raw materials of the present invention are readily available, the preparation method is simple, and the effect is good. The platinum complex luminescent thin film can be widely used in fields such as volatile organic compound detection and thermal sensing.

Description

Technical Field

[0001] The present invention relates to the field of luminescent thin film materials, and in particular to a preparation method and application of a multi-response platinum complex luminescent thin film. Background Art

[0002] Luminescent film is an important functional material that exhibits superior contrast, thermal conductivity, substrate adhesion, and outgassing rate. Environmentally responsive optoelectronic materials exhibit visible changes in color and luminescence in response to external stimuli such as steam, stress, and light. These materials hold significant potential for application in high-tech fields such as environmental monitoring, color-changing anti-counterfeiting, and novel optoelectronic devices.

[0003] Over the past two decades, research on luminescent color-changing materials has garnered significant attention. These materials exhibit unique light and color changes in response to external stimuli, such as light, heat, and mechanical friction. Multi-responsive luminescent color-changing materials, which exhibit distinct responses to multiple stimuli simultaneously, are finding application in numerous fields.

[0004] In 1963, Professor Pope of New York University first discovered electroluminescence from single-crystal anthracene, an organic material. In 1990, Professor Burroughes, Professor Friend, and others at the Cavendish Laboratory at the University of Cambridge, UK, used poly(p-phenylene vinylene) (PPV) as the luminescent material to create polymer electroluminescent devices, pioneering the field of polymer thin-film electroluminescence. In 1997, Professor Forrest of Princeton University discovered electrophosphorescence. The electrophosphorescent organic light-emitting devices (PHOLEDs) technology reported by Professor Forrest broke through the quantum efficiency limit of less than 25% for organic electroluminescent materials. According to the theory of spin statistics in quantum mechanics, the probabilities of forming singlet excitons and triplet excitons are 25% and 75%, respectively. However, in phosphorescent materials, the introduction of heavy metal atoms (Ir, Pt, Os, Au, Cu) in the complex improves the coupling between spin and orbit, shortens the lifetime of phosphorescence, makes the original triplet state have certain singlet state characteristics, enhances the intersystem crossing ability, and causes the forbidden triplet state to transition to the ground state to become locally allowed, thereby enabling the smooth emission of phosphorescence.

[0005] In recent years, platinum complexes have attracted the attention of optoelectronic scientists as luminescent materials. However, research on environmentally responsive optoelectronic functional materials based on platinum complexes has primarily focused on solutions, crystals, or powder samples. These samples are prone to loss during use, hindering practical applications. Therefore, there is a need for a luminescent film that exhibits a stable state in the absence of external stimuli but exhibits changes in luminescence intensity when exposed to steam or heating. Summary of the Invention

[0006] (1) Technical problems solved

[0007] The present invention provides a method for preparing a multi-responsive platinum complex luminescent film and its application. The platinum complex Pt(C^N^N)(Dmpi)Cl is doped into a high molecular polymer substrate to prepare a luminescent film. The luminescent film exhibits a stable state in the absence of external stimulation, but when the luminescent film is exposed to different steam and heating conditions, the luminescent intensity will change significantly.

[0008] (2) Technical solution

[0009] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0010] A method for preparing a multi-responsive platinum complex luminescent film comprises the following steps:

[0011] (1) Preparing a platinum complex Pt(C^N^N)(Dmpi)Cl by reacting a platinum complex precursor with 2,6-dimethylbenzene isocyanide to prepare a pinene-functionalized complex, and then recrystallizing the pinene-functionalized complex multiple times in a chloroform solution to obtain a platinum complex Pt(C^N^N)(Dmpi)Cl;

[0012] (2) preparing a platinum complex solution, dissolving the platinum complex Pt(C^N^N)(Dmpi)Cl in a good solvent S1 at room temperature and stirring until completely dissolved to obtain a platinum complex solution;

[0013] (3) preparing a polymer solution by dissolving the polymer in a good solvent S2 at room temperature, and ultrasonically stirring until the polymer is completely dissolved to obtain a polymer solution;

[0014] (4) preparing a composite solution by mixing the platinum complex solution and the high molecular weight polymer solution at room temperature and stirring them to fully dissolve them to obtain a composite solution;

[0015] (5) Prepare a platinum complex film by dropping 1 to 10 mL of the above-mentioned composite solution into an evaporating dish with a diameter of 7.5 cm, casting it flat, and evaporating the composite solution at room temperature for more than 24 h to obtain a platinum complex film.

[0016] Preferably, in step (1), the structural formula of the platinum complex Pt(C^N^N)(Dmpi)Cl is as follows:

[0017]

[0018] Preferably, in step (2), the good solvent S1 is chloroform, and the concentration of the platinum complex solution is 0.1-1 g / L.

[0019] Preferably, in step (3), the high molecular weight polymer is one or more of polymethyl methacrylate, sodium carboxymethyl cellulose, hydroxypropyl cellulose, chitosan, and sodium alginate; the good solvent S2 is methanol, chloroform, or water, and the concentration of the high molecular weight polymer solution is 5 to 50 g / L.

[0020] Preferably, in step (4), the mass ratio of the high molecular weight polymer to the platinum complex in the composite solution is (100-10000):1.

[0021] Preferably, in step (4), the mass ratio of the high molecular weight polymer to the platinum complex in the composite solution is (200-1000):1.

[0022] Preferably, the room temperature is 25°C ± 2°C.

[0023] Preferably, in step (5), the maximum emission wavelength of the platinum complex film is 530 nm to 560 nm; when the high molecular polymer is polymethyl methacrylate, the obtained platinum complex film exhibits reversible vapor response behavior when exposed to CH2Cl2 vapor and presents a yellow color that can be distinguished by the naked eye, and in the CH2Cl2 vapor environment, the luminescence intensity of the platinum complex film at 545 nm is 1 times greater than the luminescence intensity at other wavelengths.

[0024] The invention discloses an application of a multi-responsive platinum complex luminescent film, wherein the platinum complex film is used in the fields of volatile organic compound detection and thermal sensing.

[0025] (3) Beneficial effects

[0026] The present invention provides a preparation method and application of a multi-responsive platinum complex luminescent film, which has the following beneficial effects:

[0027] (1) The platinum complex film prepared by the present invention exhibits gas-induced and heat-induced response behaviors; when the platinum complex prepared by the present invention is exposed to solvent vapor, the solvent vapor can penetrate into the platinum complex film, thereby reducing the quenching of triplet excited luminescence of the platinum complex molecules, resulting in enhanced emission intensity of the platinum complex film, and the platinum complex film exhibits reversible luminescence enhancement behavior when exposed to dichloromethane vapor, that is, reversible vapor response behavior; the platinum complex film exhibits heat-induced response behavior, exhibits obvious thermoluminescence enhancement behavior, and the luminescence intensity increases by 1 to 2 times.

[0028] (2) The present invention mixes platinum complex powder with a high molecular polymer matrix material, and grafts small molecules of the platinum complex onto the high molecular polymer skeleton to prepare a polymer film. The platinum complex film exhibits a stable state in the absence of external stimulation. When the platinum complex film is exposed to steam or heating conditions, a significant change in luminescence intensity occurs, which is of great significance for the practical application of environmentally responsive optoelectronic functional materials.

[0029] (3) The platinum complex film prepared by the present invention has important research value in the field of volatile organic compound detection and thermal sensing; and the preparation method provided by the present invention is relatively low in cost, simple to operate, low in risk, and easy to promote and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 These are photographs of the platinum complex film prepared in Example 2 of the present invention exposed to different solvent vapors and irradiated with an ultraviolet lamp (λ = 365 nm);

[0031] Figure 2 Graphs showing emission spectra of the platinum complex film prepared in Example 2 of the present invention when exposed to different solvent vapors (λex = 420 nm);

[0032] Figure 3 IR spectra of the platinum complex film prepared in Example 2 of the present invention before and after exposure to CH2Cl2 vapor;

[0033] Figure 4 UV spectra of the platinum complex film prepared in Example 2 of the present invention before and after exposure to CH2Cl2 vapor;

[0034] Figure 5 This is a luminescence photograph (λ = 365 nm) of the platinum complex film prepared in Example 2 of the present invention during the reversible response to CH2Cl2 vapor;

[0035] Figure 6 This is an emission spectrum of the platinum complex film prepared in Example 2 of the present invention during the reversible response to CH2Cl2 vapor (λex = 420 nm);

[0036] Figure 7 These are photos of the platinum complex film prepared in Example 2 of the present invention after being heated in a 70°C oven and irradiated with an ultraviolet lamp (λ = 365 nm), as well as the luminescence spectra (λex = 420 nm) before and after heating. DETAILED DESCRIPTION

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0038] Example 1

[0039] A method for preparing a multi-responsive platinum complex luminescent film comprises the following steps:

[0040] (1) Preparing a platinum complex Pt(C^N^N)(Dmpi)Cl by reacting a platinum complex precursor with 2,6-dimethylbenzene isocyanide to prepare a pinene-functionalized platinum complex, and then recrystallizing the pinene-functionalized platinum complex multiple times in a chloroform solution to obtain a platinum complex Pt(C^N^N)(Dmpi)Cl;

[0041] (2) Prepare a platinum complex solution by completely dissolving 0.001 g of the platinum complex Pt(C^N^N)(Dmpi)Cl in 10 mL of chloroform at room temperature to obtain a platinum complex solution with a concentration of 0.1 g / L.

[0042] (3) Prepare a polymethyl methacrylate solution by dissolving 0.5 g of polymethyl methacrylate in 10 mL of chloroform at room temperature, and ultrasonicate and stir until the polymethyl methacrylate is completely dissolved to obtain a polymethyl methacrylate solution with a concentration of 5 g / L.

[0043] (4) preparing a composite solution by mixing the platinum complex solution and the polymethyl methacrylate solution at room temperature and stirring to fully dissolve the two to prepare a composite solution; wherein the mass ratio of polymethyl methacrylate to platinum complex is 100:1;

[0044] (5) Preparation of platinum complex film: 10 mL of the above-mentioned composite solution was dropped into an evaporating dish with a diameter of 7.5 cm, and the film was cast flat. The composite solution was evaporated at room temperature for more than 24 h to obtain a platinum complex film.

[0045] The room temperature is 25°C ± 2°C, and the structural formula of the platinum complex Pt(C^N^N)(Dmpi)Cl is as follows:

[0046]

[0047] Example 2

[0048] A method for preparing a multi-responsive platinum complex luminescent film comprises the following steps:

[0049] (1) Preparing a platinum complex solution, referring to Example 1, to prepare a platinum complex Pt(C^N^N)(Dmpi)Cl; completely dissolving 0.005 g of the platinum complex Pt(C^N^N)(Dmpi)Cl in 10 mL of chloroform at room temperature to prepare a platinum complex solution with a concentration of 0.5 g / L;

[0050] (2) Prepare a polymethyl methacrylate solution by dissolving 1 g of polymethyl methacrylate in 100 mL of chloroform at room temperature and stirring under ultrasonication until completely dissolved to obtain a polymethyl methacrylate solution with a concentration of 10 g / L.

[0051] (3) preparing a composite solution by stirring and uniformly mixing the platinum complex solution and polymethyl methacrylate at room temperature to obtain a composite solution having a mass ratio of polymethyl methacrylate to platinum complex of 200:1;

[0052] (4) Preparation of platinum complex film: 5 mL of the above-mentioned composite solution was dropped into an evaporating dish with a diameter of 7.5 cm, and the film was cast flat. The composite solution was evaporated at room temperature for more than 24 h to obtain a platinum complex film.

[0053] Example 3

[0054] A method for preparing a multi-responsive platinum complex luminescent film comprises the following steps:

[0055] (1) Preparing a platinum complex solution, referring to Example 1, to prepare a platinum complex Pt(C^N^N)(Dmpi)Cl; completely dissolving 0.005 g of the platinum complex Pt(C^N^N)(Dmpi)Cl in 10 mL of chloroform at room temperature to prepare a platinum complex solution with a concentration of 0.5 g / L;

[0056] (2) Prepare a polymethyl methacrylate solution. Dissolve 5 g of polymethyl methacrylate in 200 mL of chloroform at room temperature and ultrasonicate and stir until completely dissolved to obtain a polymethyl methacrylate solution with a concentration of 25 g / L.

[0057] (3) preparing a composite solution by stirring and mixing the platinum complex solution and the polymethyl methacrylate solution at room temperature to obtain a composite solution having a mass ratio of polymethyl methacrylate to platinum complex of 1000:1;

[0058] (4) Preparation of platinum complex film: 5 mL of the above-mentioned composite solution was dropped into an evaporating dish with a diameter of 7.5 cm, and the film was cast flat. The composite solution was evaporated at room temperature for more than 24 h to obtain a platinum complex film.

[0059] Example 4

[0060] A method for preparing a multi-responsive platinum complex luminescent film comprises the following steps:

[0061] (1) Prepare a platinum complex solution. Referring to Example 1, prepare a platinum complex Pt(C^N^N)(Dmpi)Cl; completely dissolve 0.005 g of the platinum complex Pt(C^N^N)(Dmpi)Cl in 5 mL of chloroform at room temperature to prepare a platinum complex solution with a concentration of 1 g / L;

[0062] (2) Prepare a polymethyl methacrylate solution by dissolving 50 g of polymethyl methacrylate in 1000 mL of chloroform at room temperature and ultrasonically stirring until completely dissolved to obtain a polymethyl methacrylate solution with a concentration of 50 g / L.

[0063] (3) preparing a composite solution by stirring and uniformly mixing the platinum complex solution and the polymethyl methacrylate solution at room temperature to obtain a composite solution having a mass ratio of polymethyl methacrylate to platinum complex of 10,000:1;

[0064] (4) Preparation of platinum complex film: 1 mL of the above-mentioned composite solution was dropped into an evaporating dish with a diameter of 7.5 cm, and the film was cast flat. The composite solution was evaporated at room temperature for more than 24 h to obtain a platinum complex film.

[0065] Example 5

[0066] A method for preparing a multi-responsive platinum complex luminescent film comprises the following steps:

[0067] (1) Preparing a platinum complex solution, referring to Example 1, to prepare a platinum complex Pt(C^N^N)(Dmpi)Cl; completely dissolving 0.005 g of the platinum complex Pt(C^N^N)(Dmpi)Cl in 10 mL of chloroform at room temperature to prepare a platinum complex solution with a concentration of 0.5 g / L;

[0068] (2) Prepare hydroxypropyl cellulose solution: dissolve 1 g of hydroxypropyl cellulose in 100 mL of methanol at room temperature and ultrasonicate and stir until completely dissolved to obtain a hydroxypropyl cellulose solution with a concentration of 10 g / L;

[0069] (3) preparing a composite solution by stirring and uniformly mixing the platinum complex solution and the hydroxypropyl cellulose solution at room temperature to obtain a composite solution having a mass ratio of polymethyl methacrylate to platinum complex of 200:1;

[0070] (4) Preparation of platinum complex film: 5 mL of the above-mentioned composite solution was dropped into an evaporating dish with a diameter of 7.5 cm, and the film was cast flat. The composite solution was evaporated at room temperature for more than 24 h to obtain a platinum complex film.

[0071] Example 6

[0072] A method for preparing a multi-responsive platinum complex luminescent film comprises the following steps:

[0073] (1) Preparing a platinum complex solution, referring to Example 1, to prepare a platinum complex Pt(C^N^N)(Dmpi)Cl; completely dissolving 0.005 g of the platinum complex Pt(C^N^N)(Dmpi)Cl in 10 mL of chloroform at room temperature to prepare a platinum complex solution with a concentration of 0.5 g / L;

[0074] (2) Prepare chitosan solution: dissolve 1 g of chitosan in 100 mL of water at room temperature and ultrasonicate and stir until completely dissolved to obtain a chitosan solution with a concentration of 10 g / L;

[0075] (3) preparing a composite solution by stirring and uniformly mixing the platinum complex solution and the chitosan solution at room temperature to obtain a composite solution having a mass ratio of polymethyl methacrylate to platinum complex of 200:1;

[0076] (4) Preparation of platinum complex film: 5 mL of the above-mentioned composite solution was dropped into an evaporating dish with a diameter of 7.5 cm, and the film was cast flat. The composite solution was evaporated at room temperature for more than 24 h to obtain a platinum complex film.

[0077] Example 7

[0078] A method for preparing a multi-responsive platinum complex luminescent film comprises the following steps:

[0079] (1) Preparing a platinum complex solution, referring to Example 1, to prepare a platinum complex Pt(C^N^N)(Dmpi)Cl; completely dissolving 0.005 g of the platinum complex Pt(C^N^N)(Dmpi)Cl in 10 mL of chloroform at room temperature to prepare a platinum complex solution with a concentration of 0.5 g / L;

[0080] (2) Prepare sodium carboxymethyl cellulose solution: dissolve 1 g of sodium carboxymethyl cellulose in 100 mL of water at room temperature and ultrasonicate and stir until completely dissolved to obtain a sodium carboxymethyl cellulose solution with a concentration of 10 g / L;

[0081] (3) preparing a composite solution by stirring and mixing the platinum complex solution and the sodium carboxymethyl cellulose solution at room temperature to obtain a composite solution having a mass ratio of polymethyl methacrylate to platinum complex of 200:1;

[0082] (4) Preparation of platinum complex film: 5 mL of the above-mentioned composite solution was dropped into an evaporating dish with a diameter of 7.5 cm, and the film was cast flat. The composite solution was evaporated at room temperature for more than 24 h to obtain a platinum complex film.

[0083] Example 8

[0084] A method for preparing a multi-responsive platinum complex luminescent film comprises the following steps:

[0085] (1) Preparing a platinum complex solution, referring to Example 1, to prepare a platinum complex Pt(C^N^N)(Dmpi)Cl; completely dissolving 0.005 g of the platinum complex Pt(C^N^N)(Dmpi)Cl in 10 mL of chloroform at room temperature to prepare a platinum complex solution with a concentration of 0.5 g / L;

[0086] (2) Prepare sodium alginate solution: dissolve 1 g of sodium alginate in 100 mL of water at room temperature and ultrasonicate and stir until completely dissolved to obtain a sodium alginate solution with a concentration of 10 g / L;

[0087] (3) preparing a composite solution by stirring and uniformly mixing the platinum complex solution and the sodium alginate solution at room temperature to obtain a composite solution having a mass ratio of polymethyl methacrylate to platinum complex of 200:1;

[0088] (4) Preparation of platinum complex film: 5 mL of the above-mentioned composite solution was dropped into an evaporating dish with a diameter of 7.5 cm, and the film was cast flat. The composite solution was evaporated at room temperature for more than 24 h to obtain a platinum complex film.

[0089] Detection and analysis of gas- and thermal-induced response behaviors

[0090] The platinum complex film prepared in Example 2 was used to detect and analyze the response behavior.

[0091] (1) Detection and analysis of gas-induced response behavior

[0092] like Figure 1 As shown in the figure, when the platinum complex film is exposed to CH2Cl2 vapor, the luminescence intensity is significantly enhanced, while when the platinum complex film is exposed to CH3OH vapor and H2O vapor, the luminescence intensity of the platinum complex film does not change much; when the polymer is polymethyl methacrylate, the prepared platinum complex film exhibits steam response behavior when exposed to CH2Cl2 vapor.

[0093] like Figure 2As shown in the figure, the maximum emission wavelength of the platinum complex film is around 545 nm, and its emission state comes from 3MLCT and 3LLCT; CH2Cl2 vapor significantly enhances the luminescence at 545 nm, and the emission intensity increases by about 1 times. This is because the solvent vapor penetrates into the platinum complex film, reducing the quenching of the molecular triplet excited state of luminescence, resulting in an enhanced emission intensity of the platinum complex film.

[0094] By performing infrared and ultraviolet spectroscopy tests on platinum complex films before and after exposure to CH2Cl2 vapor, as Figure 3 and Figure 4 As shown, the platinum complex film did not show new infrared and ultraviolet absorption peaks before and after exposure to CH2Cl2 vapor, indicating that the chemical structure of the platinum complex film did not change.

[0095] The platinum complex film exhibits reversible vapor response behavior to CH2Cl2 vapor, such as Figure 5 and Figure 6 As shown in the figure, when the platinum complex film is exposed to CH2Cl2 vapor, the luminescence intensity of the platinum complex film is significantly enhanced. Subsequently, when the platinum complex film is placed in the air, the luminescence intensity gradually weakens. After 30 minutes, the luminescence intensity of the platinum complex film is basically consistent with the initial one. By monitoring the emission spectrum, at 30 minutes, the emission curve of the platinum complex film basically overlaps with the initial curve, indicating that the gas-induced response behavior of the platinum complex film is reversible.

[0096] The molecular configuration and stacking mode of the platinum complex Pt(C^N^N)(Dmpi)Cl are highly sensitive to external environmental stimuli. Under external stimuli, individual molecules may undergo configurational changes or form aggregates through Pt-Pt, π-π and other interactions. These morphological changes are reversible under the stimulation of a solvent vapor environment.

[0097] (2) Detection and analysis of thermal response behavior

[0098] like Figure 7 As shown in the figure, the platinum complex film exhibits obvious thermoluminescence enhancement; when the platinum complex film is placed in a 70℃ oven and heated for 3 minutes, the luminescence intensity is significantly enhanced; the maximum emission wavelength of the platinum complex film before and after heating is around 545 nm, and the intensity of the maximum emission wavelength of the platinum complex film increases by about 1 times after heating; the peak shape of the emission spectrum of the platinum complex film changes slightly after heating, the symmetry of the emission curve after heating is enhanced, and the shoulder peak (λ = 515 nm) becomes narrower. This is because the conformational flexibility of the platinum complex film is reduced after heating, which inhibits the non-radiative decay process, resulting in enhanced luminescence.

[0099] When the platinum complex film is left to cool at room temperature for 24 hours, its ability to inhibit non-radiative decay weakens, and the emission intensity is reduced to half of that of the heated luminescent film, which is similar to the emission spectrum of the platinum complex film before heating.

[0100] This invention utilizes the platinum complex Pt(C^N^N)(Dmpi)Cl's ability to readily change color and luminescence in response to environmental stimuli to detect volatile organic compounds (VOCs). This method utilizes its responsiveness to different vapor atmospheres to detect VOCs. The resulting platinum complex thin film has significant application value in VOC detection and thermal sensing.

[0101] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for preparing a multi-responsive platinum complex luminescent film, characterized in that: The following steps are involved: (1) Preparing a platinum complex Pt(C^N^N)(Dmpi)Cl by reacting a platinum complex precursor with 2,6-dimethylbenzene isocyanide to prepare a pinene-functionalized complex, and then recrystallizing the pinene-functionalized complex multiple times in a chloroform solution to obtain a platinum complex Pt(C^N^N)(Dmpi)Cl; (2) preparing a platinum complex solution, dissolving the platinum complex Pt(C^N^N)(Dmpi)Cl in a good solvent S1 at room temperature and stirring until completely dissolved to obtain a platinum complex solution; (3) preparing a polymer solution by dissolving the polymer in a good solvent S2 at room temperature, and ultrasonically stirring until the polymer is completely dissolved to obtain a polymer solution; (4) preparing a composite solution by mixing the platinum complex solution and the high molecular weight polymer solution at room temperature and stirring them to fully dissolve them to obtain a composite solution; (5) Preparing a platinum complex film: drip 1-10 mL of the above-mentioned composite solution into an evaporating dish with a diameter of 7.5 cm, cast it flat, and evaporate the composite solution at room temperature for more than 24 hours to obtain a platinum complex film; In step (2), the good solvent S1 is chloroform, and the concentration of the platinum complex solution is 0.1-1 g / L; In step (4), the mass ratio of the high molecular weight polymer to the platinum complex in the composite solution is (100-10000):1; The high molecular polymer is polymethyl methacrylate; the good solvent S2 is methanol, chloroform or water, and the concentration of the high molecular polymer solution is 5 to 50 g / L; In step (1), the structural formula of the platinum complex Pt(C^N^N)(Dmpi)Cl is as follows: 。 2. The method for preparing a multi-responsive platinum complex luminescent thin film according to claim 1, wherein: In step (4), the mass ratio of the high molecular weight polymer to the platinum complex in the composite solution is (200-1000):

1.

3. The method for preparing a multi-responsive platinum complex luminescent thin film according to claim 1, wherein: The room temperature is 25°C±2°C.

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