Iridium complex and iridium complex / natural polymer composite material as well as preparation method and application of iridium complex / natural polymer composite material

Abstract

The invention discloses an iridium complex, an iridium complex / natural polymer composite material as well as a preparation method and application of the iridium complex / natural polymer composite material, and relates to the technical field of organic photoelectric functional materials. According to the present invention, the problem of aggregation fluorescence quenching of the traditional iridium complex under the high concentration or the solid state is solved, the aggregation-induced emission effect is significantly improved, the hydrophobicity, the film forming uniformity and the photophysical property of the composite material can be optimized, and the adjustable (yellow light to orange light) high-intensity stable light emission can be achieved under the 365 nm ultraviolet excitation.

Description

Technical Field

[0001] The present invention relates to the technical field of organic photoelectric functional materials, and in particular to an iridium complex and an iridium complex / natural polymer composite material, as well as a preparation method and application thereof. Background Art

[0002] Iridium metal complexes have attracted much attention in the field of optoelectronic devices due to their high quantum efficiency, tunable emission color, and long excited-state lifetime. However, traditional iridium complexes are prone to aggregation-induced quenching (ACQ) in the solid state or at high concentrations, and their poor hydrophobicity and film-forming properties severely restrict their practical applications. To address this issue, researchers have attempted to introduce alkyl chains to modify the ligand structure to improve hydrophobicity and molecular stacking. For example, the introduction of lipophilic alkyl chains can inhibit π-π stacking, improve solvent solubility, and optimize film uniformity; at the same time, the flexible design of the alkyl chain can enhance the molecular self-assembly ability, reduce non-radiative transitions, and thus improve luminescence efficiency. Despite this, single iridium complexes still have problems such as low mechanical strength and poor environmental stability.

[0003] Natural polymer materials (such as chitosan and sodium alginate) are considered ideal matrices due to their biocompatibility, degradability, and excellent film-forming properties. Chitosan forms a transparent, flexible film at pH 5. Its amino and hydroxyl groups can hydrogen bond with iridium complexes, inhibiting phase separation. The carboxyl anions in sodium alginate stabilize the dispersed state of the iridium complex through electrostatic interactions. However, the composite process requires precise control of matrix concentration, pH, and iridium complex doping level; otherwise, phase separation or luminescence quenching is likely to occur. Existing technologies have not yet effectively synergized the optical advantages of lipophilic iridium complexes with the film-forming properties of natural polymers. There is an urgent need to develop a composite film preparation method that balances high luminescence efficiency, environmental stability, and processability. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an iridium complex and an iridium complex / natural polymer composite material and a preparation method thereof. By using a long alkyl chain to structurally modify the ligand of the iridium complex, a lipophilic iridium complex is designed and synthesized, which can effectively regulate the photophysical properties of the iridium complex, especially the luminescent properties of the optically functional thin film.

[0005] The technical problem to be solved by the present invention is achieved by adopting the following technical solutions: One of the objects of the present invention is to provide an iridium complex, the structural formula of which is as follows: ; The value of n is an integer between 7 and 13.

[0006] A second object of the present invention is to provide a method for preparing the iridium complex, comprising the following steps: (1) reacting the primary ligand with iridium trichloride trihydrate to obtain an iridium-chlorobridged dimer; (2) reacting the iridium-chloro bridge dimer with an auxiliary ligand and hexafluorophosphate to obtain an iridium complex; Wherein, the main ligand is 2-phenylbenzimidazole modified with a long alkyl chain; and the auxiliary ligand is 2-(2-pyridyl)benzimidazole modified with a long alkyl chain.

[0007] Furthermore, the hexafluorophosphate is at least one of potassium hexafluorophosphate, sodium hexafluorophosphate, and ammonium hexafluorophosphate.

[0008] Furthermore, the molar ratio of the main ligand, the auxiliary ligand, iridium trichloride trihydrate, and hexafluorophosphate is 2:1:(1~1.5):(1~1.5).

[0009] The third object of the present invention is to provide a method for preparing an iridium complex / natural polymer composite material, which comprises dissolving a natural polymer material in a solvent to prepare a solution, then adding the iridium complex, mixing uniformly, and drying to obtain the iridium complex / natural polymer composite material.

[0010] Furthermore, the natural polymer material includes but is not limited to at least one of chitosan and sodium alginate. When the natural polymer material is chitosan, the pH value of the solution is adjusted to 3.0-6.0 with glacial acetic acid to completely dissolve the chitosan.

[0011] Furthermore, the solvent is an organic solvent and / or water. Furthermore, the organic solvent includes but is not limited to at least one of methanol, ethanol, acetone, ethyl acetate, N,N-dimethylformamide, and dimethyl sulfoxide.

[0012] Furthermore, the usage ratio of the natural polymer material to the iridium complex is 10 mg: (0.5~5) μmol.

[0013] A fourth object of the present invention is to provide an iridium complex / natural polymer composite material obtained by the aforementioned preparation method.

[0014] A fifth objective of the present invention is to provide the use of the iridium complex and iridium complex / natural polymer composite material in photoluminescent materials. The iridium complex / natural polymer composite material can be formed into a thin film using a solution film formation method. This film combines the advantages of being environmentally friendly, flexible, and having high luminous efficiency. As a photoluminescent film, it can be used in applications such as the light-emitting layer of flexible organic light-emitting diode (OLED) devices, biocompatible optical sensors, and blue light-blocking coatings.

[0015] The beneficial effects of the present invention are as follows: by modifying the iridium complex with a long alkyl chain and compounding the natural polymer material with the iridium complex, the present invention not only solves the aggregation fluorescence quenching problem of the traditional iridium complex at high concentration or in the solid state, significantly improves the aggregation-induced emission effect, but also optimizes the hydrophobicity, film-forming uniformity and photophysical properties of the composite material, and realizes adjustable (yellow to orange light) high-intensity stable emission under 365 nm ultraviolet excitation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 UV-visible absorption spectra of the iridium complex prepared in Example 2 in methanol-water mixed solutions with different water contents; Figure 2 The fluorescence emission spectra of the iridium complex prepared in Example 2 in methanol-water mixed solutions with different water contents; Figure 3 The irradiation effects of the iridium complex / chitosan composite film prepared in Example 8 under sunlight and 365 nm ultraviolet light respectively; Figure 4 This is the UV-visible absorption spectrum of the iridium complex / chitosan composite film prepared in Example 8; Figure 5 This is the fluorescence emission spectrum of the iridium complex / chitosan composite film prepared in Example 8; Figure 6 This is the effect of 365 nm ultraviolet light irradiation on the iridium complex / sodium alginate composite film prepared in Example 9; Figure 7 This is the UV-visible absorption spectrum of the iridium complex / sodium alginate composite film prepared in Example 9; Figure 8 This is the fluorescence emission spectrum of the iridium complex / sodium alginate composite film prepared in Example 9. DETAILED DESCRIPTION

[0017] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below with reference to specific embodiments and illustrations.

[0018] Example 1 Synthesis of linear octyl-modified iridium complexes:

[0019] (1) 20 mmol of linear octyl-modified 2-phenylbenzimidazole was dissolved in 50 mL of ethylene glycol monoethyl ether. Then, 15 mmol of iridium trichloride trihydrate and 50 mL of deionized water were added. The mixture was heated to 120 °C under nitrogen and reacted for 24 h. The mixture was cooled to room temperature, filtered, washed with water, and dried to obtain an iridium-chlorobridged dimer with a yield of 100%.

[0020] (2) The iridium chloride bridge dimer prepared in step (1) and 10 mmol of linear octyl-modified 2-(2-pyridyl)benzimidazole were added to 100 mL of ethylene glycol monoethyl ether, and the temperature was raised to 120°C under nitrogen protection for 6 h. The mixture was cooled to room temperature, and then 15 mmol of potassium hexafluorophosphate was added and stirred for 1 h. The mixture was filtered, washed with water, and purified by column chromatography to obtain a linear octyl-modified iridium complex in a yield of 40%. 1 H NMR (400 MHz, CDCl3) δ (ppm): 8.56 (d, J = 8.0 Hz, 1H), 8.37(t, J = 4.0 Hz, 1H), 8.13 (d, J = 4.0 Hz, 1H), 7.78-7.72 (m, 2H), 7.52 (d, J = 8.0Hz, 1H), 7.43-7.38 (m, 2H), 7.36-7.32 (m, 2H), 7.25-7.20 (m, 2H), 7.11-7.06(m, 2H), 7.01-6.93 (m, 2H),6.83-6.76 (m, 3H), 6.47 (d, J = 8.0 Hz, 1H), 6.40(d, J = 8.0 Hz, 1H), 6.32 (d, J = 8.0 Hz, 1H), 5.89 (d, J = 8.0 Hz, 1H), 5.67 (d, J =8.0 Hz, 1H), 4.83-4.79 (m, 2H), 4.74-4.65 (m, 2H), 4.63-4.56 (m, 2H), 2.06-2.00 (m, 2H), 1.88-1.83 (m,4H), 1.26 (s, 30H), 0.90-0.88 (m, 9H).

[0021] Example 2 Synthesis of linear nonyl-modified iridium complexes: The method of Example 1 was followed, except that the linear octyl-modified 2-phenylbenzimidazole and the linear octyl-modified 2-(2-pyridyl)benzimidazole were replaced by linear nonyl-modified 2-phenylbenzimidazole and linear nonyl-modified 2-(2-pyridyl)benzimidazole, respectively.

[0022] ; 1 H NMR (400 MHz, CDCl3) δ (ppm): 8.56 (d, J = 8.0 Hz, 1H), 8.37 (t, J = 4.0Hz, 1H), 8.13 (d, J = 4.0 Hz, 1H), 7.78-7.72 (m, 2H), 7.52 (d, J = 8.0 Hz, 1H),7.43-7.38 (m, 2H), 7.36-7.32 (m, 2H), 7.25-7.20 (m, 2H), 7.11-7.06 (m, 2H),7.01-6.93 (m, 2H), 6.83-6.76 (m, 3H), 6.47 (d, J = 8.0 Hz, 1H), 6.40 (d, J = 8.0Hz, 1H), 6.32 (d, J = 8.0 Hz, 1H), 5.89 (d, J = 8.0 Hz, 1H), 5.67 (d, J = 8.0 Hz,1H), 4.83-4.79 (m, 2H), 4.74-4.65 (m, 2H), 4.63-4.56 (m, 2H), 2.06-2.00 (m,2H), 1.88-1.83 (m,4H), 1.26 (s, 30H), 0.90-0.88 (m, 9H).

[0023] Example 3 Synthesis of linear decyl modified iridium complexes: The method of Example 1 was followed, except that the linear octyl-modified 2-phenylbenzimidazole and the linear octyl-modified 2-(2-pyridyl)benzimidazole were replaced by linear decyl-modified 2-phenylbenzimidazole and linear decyl-modified 2-(2-pyridyl)benzimidazole, respectively.

[0024] ; 1 H NMR (400 MHz, CDCl3) δ (ppm): 8.56 (d, J = 8.0 Hz, 1H), 8.37 (t, J = 4.0Hz, 1H), 8.13 (d,J = 4.0 Hz, 1H), 7.78-7.72 (m, 2H), 7.52 (d, J = 8.0 Hz, 1H),7.43-7.38 (m, 2H), 7.36-7.32 (m, 2H), 7.25-7.20 (m, 2H), 7.11-7.06 (m, 2H),7.01-6.93 (m, 2H), 6.83-6.76 (m, 3H), 6.47 (d, J = 8.0 Hz, 1H), 6.40 (d, J = 8.0Hz, 1H), 6.32 (d, J = 8.0 Hz, 1H), 5.89 (d, J = 8.0 Hz, 1H), 5.67 (d, J = 8.0 Hz,1H), 4.83-4.79 (m, 2H), 4.74-4.65 (m, 2H), 4.63-4.56 (m, 2H), 2.06-2.00 (m,2H), 1.88-1.83 (m,4H), 1.26 (s, 36H), 0.90-0.88 (m, 9H).

[0025] Example 4 Synthesis of linear undecyl-modified iridium complexes: The method of Example 1 was followed, except that the linear octyl-modified 2-phenylbenzimidazole and the linear octyl-modified 2-(2-pyridyl)benzimidazole were replaced by linear undecyl-modified 2-phenylbenzimidazole and linear undecyl-modified 2-(2-pyridyl)benzimidazole, respectively.

[0026] ; 1 H NMR (400 MHz, CDCl3) δ (ppm): 8.56 (d, J = 8.0 Hz, 1H), 8.37 (t, J = 4.0Hz, 1H), 8.13 (d, J = 4.0 Hz, 1H), 7.78-7.72 (m, 2H), 7.52 (d, J= 8.0 Hz, 1H),7.43-7.38 (m, 2H), 7.36-7.32 (m, 2H), 7.25-7.20 (m, 2H), 7.11-7.06 (m, 2H),7.01-6.93 (m, 2H), 6.83-6.76 (m, 3H), 6.47 (d, J = 8.0 Hz, 1H), 6.40 (d, J = 8.0Hz, 1H), 6.32 (d, J = 8.0 Hz, 1H), 5.89 (d, J = 8.0 Hz, 1H), 5.67 (d, J = 8.0 Hz,1H), 4.83-4.79 (m, 2H), 4.74-4.65 (m, 2H), 4.63-4.56 (m, 2H), 2.06-2.00 (m,2H), 1.88-1.83 (m,4H), 1.26 (s, 42H), 0.90-0.88 (m, 9H).

[0027] Example 5 Synthesis of linear dodecyl-modified iridium complexes: The method of Example 1 was followed, except that the linear octyl-modified 2-phenylbenzimidazole and the linear octyl-modified 2-(2-pyridyl)benzimidazole were replaced by linear dodecyl-modified 2-phenylbenzimidazole and linear dodecyl-modified 2-(2-pyridyl)benzimidazole, respectively.

[0028] ; 1 H NMR (400 MHz, CDCl3) δ (ppm): 8.56 (d, J = 8.0 Hz, 1H), 8.37 (t, J = 4.0Hz, 1H), 8.13 (d, J = 4.0 Hz, 1H), 7.78-7.72 (m, 2H), 7.52 (d, J = 8.0 Hz, 1H),7.43-7.38 (m, 2H), 7.36-7.32 (m, 2H), 7.25-7.20 (m, 2H), 7.11-7.06 (m, 2H),7.01-6.93 (m, 2H), 6.83-6.76 (m, 3H), 6.47 (d,J = 8.0 Hz, 1H), 6.40 (d, J = 8.0Hz, 1H), 6.32 (d, J = 8.0 Hz, 1H), 5.89 (d, J = 8.0 Hz, 1H), 5.67 (d, J = 8.0 Hz,1H), 4.83-4.79 (m, 2H), 4.74-4.65 (m, 2H), 4.63-4.56 (m, 2H), 2.06-2.00 (m,2H), 1.88-1.83 (m,4H), 1.26 (s, 48H), 0.90-0.88 (m, 9H).

[0029] Example 6 Synthesis of linear tridecyl modified iridium complexes: The method of Example 1 was followed, except that the linear octyl-modified 2-phenylbenzimidazole and the linear octyl-modified 2-(2-pyridyl)benzimidazole were replaced by linear tridecyl-modified 2-phenylbenzimidazole and linear tridecyl-modified 2-(2-pyridyl)benzimidazole, respectively.

[0030] ; 1 H NMR (400 MHz, CDCl3) δ (ppm): 8.56 (d, J = 8.0 Hz, 1H), 8.37 (t, J = 4.0Hz, 1H), 8.13 (d, J = 4.0 Hz, 1H), 7.78-7.72 (m, 2H), 7.52 (d, J = 8.0 Hz, 1H),7.43-7.38 (m, 2H), 7.36-7.32 (m, 2H), 7.25-7.20 (m, 2H), 7.11-7.06 (m, 2H),7.01-6.93 (m, 2H), 6.83-6.76 (m, 3H), 6.47 (d, J = 8.0 Hz, 1H), 6.40 (d, J = 8.0Hz, 1H), 6.32 (d, J = 8.0 Hz, 1H), 5.89 (d, J = 8.0 Hz, 1H), 5.67 (d,J = 8.0 Hz,1H), 4.83-4.79 (m, 2H), 4.74-4.65 (m, 2H), 4.63-4.56 (m, 2H), 2.06-2.00 (m,2H), 1.88-1.83 (m,4H), 1.26 (s, 54H), 0.90-0.88 (m, 9H).

[0031] Example 7 Synthesis of linear tetradecyl modified iridium complexes: The method of Example 1 was followed, except that the linear octyl-modified 2-phenylbenzimidazole and the linear octyl-modified 2-(2-pyridyl)benzimidazole were replaced by linear tetradecyl-modified 2-phenylbenzimidazole and linear tetradecyl-modified 2-(2-pyridyl)benzimidazole, respectively.

[0032] ; 1 H NMR (400 MHz, CDCl3) δ (ppm): 8.56 (d, J = 8.0 Hz, 1H), 8.37 (t, J = 4.0Hz, 1H), 8.13 (d, J = 4.0 Hz, 1H), 7.78-7.72 (m, 2H), 7.52 (d, J = 8.0 Hz, 1H),7.43-7.38 (m, 2H), 7.36-7.32 (m, 2H), 7.25-7.20 (m, 2H), 7.11-7.06 (m, 2H),7.01-6.93 (m, 2H), 6.83-6.76 (m, 3H), 6.47 (d, J = 8.0 Hz, 1H), 6.40 (d, J = 8.0Hz, 1H), 6.32 (d, J = 8.0 Hz, 1H), 5.89 (d, J = 8.0 Hz, 1H), 5.67 (d, J= 8.0 Hz,1H), 4.83-4.79 (m, 2H), 4.74-4.65 (m, 2H), 4.63-4.56 (m, 2H), 2.06-2.00 (m,2H), 1.88-1.83 (m,4H), 1.26 (s, 60H), 0.90-0.88 (m, 9H).

[0033] Example 8 Aggregation-induced emission of iridium complexes: Figure 1 The UV-visible absorption spectra of the iridium complex prepared in Example 2 in methanol-water mixed solutions with different water contents (0-90%). Figure 1 It can be seen that all spectra have obvious high-intensity absorption peaks at 245~330 nm and relatively weak absorption peaks at 400~500 nm; from the absorption peak at 320 nm, it can be seen that when the water content in the methanol-water mixed solution is less than 50%, a red shift phenomenon occurs, indicating that the iridium complex molecules have J-type aggregation at this time, which is conducive to the generation of aggregation-induced emission (AIE) phenomenon.

[0034] Figure 2 The fluorescence emission spectra of the iridium complex prepared in Example 2 in methanol-water mixed solutions with different water contents (0-90%) are shown in Table 2. Figure 2 All spectra show fluorescence emission peaks between 520 and 650 nm. The fluorescence intensity increases with increasing water content in the methanol-water mixture, but decreases when the water content exceeds 50%. As the intermolecular distance of the iridium complex decreases, the complex undergoes a J-type stacking arrangement in solution, demonstrating AIE properties.

[0035] Example 9 Preparation of iridium complex / chitosan composite film: Dissolve 10 mg of chitosan in 5 mL of a methanol-water (1:1, v / v) mixture, and adjust the pH of the solution to 5.0 with 0.1 M glacial acetic acid to obtain a chitosan solution. Add different volumes (5 μL, 10 μL, 15 μL, 20 μL, 25 μL, 30 μL, 35 μL, 40 μL, 45 μL, and 50 μL) of a 0.1 M methanol solution of the iridium complex prepared in Example 2 to 10 portions of the chitosan solution. After thorough mixing, apply the mixture evenly to a glass slide and air-dry at room temperature for 24 h to obtain an iridium complex / chitosan composite film.

[0036] Figure 3The irradiation effect of iridium complex / chitosan composite film under sunlight and 365 nm ultraviolet light. Figure 3 It can be seen that films made with low concentrations of iridium complex (5-20 μL) emit a faint yellow light, while as the iridium complex content increases (25-50 μL), the film emits a deep yellow light. The film formation is best when the volume of the iridium complex solution is 40 μL.

[0037] Figure 4 is the UV-visible absorption spectrum of iridium complex / chitosan composite film. Figure 4 It can be seen that at an absorption wavelength of 370nm, when the volume of the iridium complex solution is 25 µL, the absorbance of the film is the lowest. This moderate absorption characteristic can effectively reduce the non-radiative energy loss caused by molecular aggregation at high concentrations, and selectively block the ultraviolet and blue light bands, making it suitable as a surface coating for optical protective devices; when the volume of the iridium complex solution is 30 µL, the absorbance of the film is the highest. This strong ultraviolet capture ability makes it valuable for application in photocatalytic films or photoluminescent devices.

[0038] Iridium complex / chitosan composite films prepared from 25 μL and 30 μL of iridium complex solution were selected for fluorescence emission spectrum measurement, such as Figure 5 As shown. Figure 5 It can be seen that the emission intensity of the film is the highest when the volume of the iridium complex solution is 30 μL.

[0039] Example 10 Preparation of iridium complex / sodium alginate composite film: Dissolve 100 mg of sodium alginate in 1 mL of a methanol-water (1:1, v / v) mixed solvent to obtain a sodium alginate solution. Add different volumes (5 μL, 10 μL, 15 μL, 20 μL, 25 μL, 30 μL, 35 μL, 40 μL, 45 μL, and 50 μL) of the iridium complex prepared in Example 2 in methanol (0.1 M) to 10 portions of the sodium alginate solution. Mix thoroughly and evenly coat the mixture on a glass slide. Air-dry at room temperature for 24 h to obtain an iridium complex / sodium alginate composite film.

[0040] Figure 6 The irradiation effect of iridium complex / sodium alginate composite film under sunlight and 365 nm ultraviolet light. Figure 6 It can be seen that as the iridium complex content increases, the film emits orange light.

[0041] Figure 7 is the UV-visible absorption spectrum of iridium complex / sodium alginate composite film. Figure 7It can be seen that at an absorption wavelength of 350nm, the film's absorbance is lowest when the volume of the iridium complex solution is 5 µL. This moderate absorption property effectively reduces non-radiative energy loss caused by molecular aggregation at high concentrations and selectively blocks ultraviolet and blue light, making it suitable as a surface coating for optical protective devices. The film's absorbance is highest when the volume of the iridium complex solution is 45 µL. This strong UV-trapping capability has application value in photocatalytic films or photoluminescent devices.

[0042] Iridium complex / sodium alginate composite films prepared from 5 μL and 45 μL of iridium complex solution were selected for fluorescence emission spectrum measurement, such as Figure 8 As shown. Figure 8 It can be seen that the emission intensity of the film is the highest when the volume of the iridium complex solution is 45 μL.

[0043] In summary, the present invention prepares a long alkyl chain-modified iridium complex, and through its composite with the natural polymer material chitosan or sodium alginate, a photofunctional film can be obtained, which has potential applications in protecting against strong ultraviolet or blue light bands or as a photoluminescent layer.

[0044] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. An iridium complex, characterized in that The structural formula of the iridium complex is shown below: ； The value of n is an integer between 7 and 13.

2. The method for preparing the iridium complex according to claim 1, wherein The following steps are involved: (1) reacting the primary ligand with iridium trichloride trihydrate to obtain an iridium-chlorobridged dimer; (2) reacting the iridium-chloro bridge dimer with an auxiliary ligand and hexafluorophosphate to obtain an iridium complex; Wherein, the main ligand is 2-phenylbenzimidazole modified with a long alkyl chain; and the auxiliary ligand is 2-(2-pyridyl)benzimidazole modified with a long alkyl chain.

3. The method for preparing an iridium complex according to claim 2, wherein: The hexafluorophosphate is at least one of potassium hexafluorophosphate, sodium hexafluorophosphate, and ammonium hexafluorophosphate.

4. The method for preparing an iridium complex according to claim 2, wherein: The molar ratio of the main ligand, the auxiliary ligand, iridium trichloride trihydrate, and hexafluorophosphate is 2:1:(1-1.5):(1-1.5).

5. A method for preparing an iridium complex / natural polymer composite material, characterized in that: The natural polymer material is dissolved in a solvent to prepare a solution, and then the iridium complex according to claim 1 is added, mixed evenly, and dried to obtain an iridium complex / natural polymer composite material.

6. The method for preparing the iridium complex / natural polymer composite material according to claim 5, wherein: The natural polymer material is at least one of chitosan and sodium alginate.

7. The method for preparing the iridium complex / natural polymer composite material according to claim 5, wherein: The solvent is an organic solvent and / or water.

8. The method for preparing the iridium complex / natural polymer composite material according to claim 5, wherein: The usage ratio of the natural polymer material to the iridium complex is 10 mg: (0.5-5) μmol.

9. An iridium complex / natural polymer composite material obtained by the preparation method according to any one of claims 5 to 8.

10. Use of the iridium complex according to claim 1 or the iridium complex / natural polymer composite material according to claim 9 in photoluminescent materials.

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