Zinc sulfide-based multicolor luminescent material, and preparation method and application thereof

Abstract

The application belongs to the technical field of multicolor luminescent materials, and specifically discloses a zinc sulfide-based multicolor luminescent material and a preparation method and application thereof, the multicolor luminescent material is manganese-doped zinc sulfide, the actual content of manganese in the material is 20-170 ppm, and the multicolor luminescent material is prepared from the following raw materials: ZnS, MnCl2 and NaCl. The application uses zinc sulfide as a raw material, uses Mn as an activator, uses NaCl for protection, and prepares a zinc sulfide-based multicolor luminescent material. The preparation method of the multicolor luminescent material adopts a high-temperature solid-phase method (molten salt shielding method), the preparation process is simple, sintering can be performed in air, and the conditions are easy to control. No toxic gas is generated in the preparation process, and there is no pollution to the environment. By adjusting different excitation conditions, the simple, low-temperature and protection-free atmosphere synthesis of the zinc sulfide-based multicolor luminescent material is realized.

Description

Technical Field

[0001] This invention belongs to the field of multicolor luminescent materials technology, and relates to a zinc sulfide-based multicolor luminescent material, its preparation method and application, specifically a trace single-element doped luminescent material with multi-excitation dependence, its preparation method and application. Background Technology

[0002] Multicolor luminescent materials are materials that can emit different colors of light under different excitation or other conditions. In recent years, due to their dynamic and stimulus-response characteristics, multicolor luminescence has attracted much attention in fields such as anti-counterfeiting, information encryption, and temperature monitoring.

[0003] Existing multicolor luminescent materials have the following main drawbacks in their preparation process:

[0004] (1) High synthesis cost: Most multicolor luminescent materials rely on the implementation of two or more types of doping in the matrix, especially rare earth ion doping, which leads to high synthesis cost of the materials.

[0005] (2) Poor chemical stability: Some materials are easily affected by the environment after long-term exposure, and have poor physical and chemical stability, which may lead to a decrease or change in luminescence performance in practical applications.

[0006] (3) Complex preparation process: The preparation of multicolor luminescent materials usually involves high-temperature solid-state sintering (usually requiring temperatures exceeding 1000°C and a protective atmosphere), and parameters such as doping concentration and deformation frequency need to be optimized to balance performance.

[0007] In view of the above problems, this invention is proposed. Summary of the Invention

[0008] This invention synthesizes multicolor luminescent materials based on zinc sulfide by doping trace amounts of manganese ions into zinc sulfide, using zinc sulfide, sodium chloride, and manganese chloride as raw materials. These materials possess two luminescent centers, and by adjusting different excitation conditions, multicolor emission from blue to orange is achieved based on the zinc sulfide luminescent materials. When two materials of different concentrations are combined as anti-counterfeiting devices, they exhibit excellent information encryption capabilities. Authentic information can only be read under specific excitation conditions.

[0009] The first objective of this invention is to provide a zinc sulfide-based multicolor luminescent material, wherein the multicolor luminescent material is zinc sulfide doped with manganese.

[0010] Preferably, the multicolor luminescent material is ZnS:xMn. 2+ (x=20-170 ppm).

[0011] Preferably, the multicolor luminescent material is ZnS:Mn 2+The actual content of Mn ions in the material is 20-170 ppm.

[0012] Using the above technical solution, different samples were sintered according to different raw material ratios.

[0013] Preferably, the multicolor luminescent material is prepared from the following raw materials: ZnS, NaCl and MnCl2, with a molar ratio of 5000:1-5:21500, and NaCl is used as a protective molten salt.

[0014] A second objective of this invention is to provide a method for preparing the above-mentioned zinc sulfide-based multicolor luminescent material, comprising the following steps:

[0015] S1: Grind and mix ZnS, MnCl2 and a portion of NaCl to obtain a mixture powder. Spread a layer of remaining NaCl on the top layer of the mixture. The mass ratio of the NaCl used in the grinding to the NaCl used on the top layer of the mixture is 4:1.

[0016] S2: The mixture obtained in step S1 is sintered in air for 4 h, and then ground to obtain trace zinc sulfide manganese-doped multicolor luminescent material.

[0017] Preferably, the sintering method of the mixture in step S2 is as follows: heat up to 200 °C at 3 °C / min, then heat up to 1000 °C at 8 °C / min and sinter for 4 h, then cool down to 200 °C at 13 °C / min, and finally cool naturally to room temperature.

[0018] A third objective of this invention is to provide applications of the aforementioned zinc sulfide-based multicolor luminescent material.

[0019] Preferably, the application is in the preparation of information encryption devices and the visualization of various stimuli.

[0020] Preferably, the method for preparing the multicolor luminescent film is as follows: two concentrations of multicolor luminescent materials are mixed evenly with PDMS colloid to obtain their respective mixed liquids; the two mixed liquids are evenly coated in a mold, sealed and covered, and then heated to cure the colloid; the cured film is cut and spliced, and encapsulated in a PET film to obtain a luminescent device that can be used for information encryption.

[0021] Preferably, the method for preparing the multicolor luminescent film is as follows: multicolor luminescent materials with concentrations of 88ppm and 162ppm are mixed evenly with PDMS colloid to obtain their respective mixed liquids. The two mixed liquids are evenly coated in a mold, sealed and covered, and then heated to cure the colloid. The cured film is cut and spliced, and then encapsulated in a PET film to obtain a luminescent device that can be used for information encryption.

[0022] Preferably, the mass percentage of the multicolor luminescent material in the mixed liquid is 30%-35%.

[0023] Preferably, the heating and curing temperature is 80 ℃ and the curing time is 1-2 h.

[0024] The beneficial effects of this invention are:

[0025] (1) This invention uses zinc sulfide (ZnS), manganese chloride (MnCl2) and sodium chloride (NaCl) as raw materials and Mn as an activator to prepare zinc sulfide-based multicolor luminescent materials. The preparation method of the multicolor luminescent materials of this invention adopts the high-temperature solid-state method with molten salt shielding. The preparation process is simple, and sintering can be carried out in air. The conditions are easy to control. No toxic gases are generated during the preparation process, and there is no pollution to the environment. Through trace doping, the simple, low-temperature synthesis of zinc sulfide-based multicolor luminescent materials without the need for a protective atmosphere is realized.

[0026] (2) Based on the fact that the blue and orange light-emitting centers of trace zinc sulfide doped with manganese respond differently to different stimulation conditions, the present invention achieves multicolor emission of trace zinc sulfide doped with manganese by adjusting the excitation conditions (such as changing the excitation wavelength, excitation power, temperature, etc.).

[0027] (3) The trace-doped zinc sulfide (ZnS) multicolor luminescent material of the present invention can be used for information encryption. A luminescent film is prepared by mixing and curing zinc sulfide (ZnS) with PDMS colloid. The film is then cut, spliced, and encapsulated in a PET film to create an information encryption device. Under other excitation conditions, the emission colors of samples with different concentrations are similar, resulting in low overall contrast, thus achieving information hiding. However, under specific conditions, the emission color contrast of the sample is relatively high, and the information can be read. This phenomenon can be directly observed with the naked eye in a dark environment. Attached Figure Description

[0028] Figure 1 Zinc sulfide (ZnS) for multicolor luminescence: 162 ppm Mn 2+ XRD pattern.

[0029] Figure 2 Zinc sulfide (ZnS) for multicolor luminescence: 162 ppm Mn 2+ PL excitation-emission spectral mapping.

[0030] Figure 3 Zinc sulfide (ZnS) for multicolor luminescence: 162 ppm Mn 2+ PL power-emission spectrum mapping.

[0031] Figure 4 Zinc sulfide (ZnS) for multicolor luminescence: 162 ppm Mn 2+PL photographs at different temperatures.

[0032] Figure 5 Zinc sulfide (ZnS) for multicolor luminescence: 162 ppm Mn 2+ PL spectra at different temperatures.

[0033] Figure 6 Zinc sulfide (ZnS) for multicolor luminescence: 162 ppm Mn 2+ Two emission intensity changes in a heating and cooling cycle.

[0034] Figure 7 Zinc sulfide (ZnS) for multicolor luminescence: 162 ppm Mn 2+ The time-resolved spectrum after excitation is stopped.

[0035] Figure 8 Zinc sulfide (ZnS) for multicolor luminescence: 162 ppm Mn 2+ Photos showing responses to various external stimuli.

[0036] Figure 9 A photograph of a device used for information encryption. Detailed Implementation

[0037] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0038] ZnS and MnCl2 were selected as raw materials, and NaCl was used as a protective molten salt. ZnS, MnCl2 and NaCl of the corresponding elements were weighed according to the composition and proportion. The ZnS, MnCl2 and NaCl raw materials were manually ground and mixed to obtain a mixture. The mixture was sintered in air at 1000 ℃ for 4 h. The mixture was ground to obtain trace zinc sulfide manganese-doped multicolor luminescent materials with different raw material ratios. The mixture was mixed evenly with PDMS colloid to obtain a mixed liquid. The colloid was heated and cured. The cured film was cut and spliced ​​and sealed in PET film to obtain a zinc sulfide-based multicolor luminescent film for information encryption.

[0039] In some embodiments, the trace zinc sulfide-based multicolor luminescent material is prepared from the following molar fractions of raw materials: 0.2 mol of ZnS, 0.0002 mol of MnCl2, and 0.86 mol of NaCl.

[0040] In some embodiments, the trace zinc sulfide-based multicolor luminescent material is prepared from the following raw materials in molar fractions: 0.2 mol of ZnS, 0.00016 mol of MnCl2 and 0.86 mol of NaCl.

[0041] In some embodiments, the trace zinc sulfide-based multicolor luminescent material is prepared from the following raw materials in molar fractions: 0.2 mol of ZnS, 0.00014 mol of MnCl2 and 0.86 mol of NaCl.

[0042] In some embodiments, the trace zinc sulfide-based multicolor luminescent material is prepared from the following raw materials in molar fractions: 0.2 mol ZnS, 0.00012 mol MnCl2, and 0.86 mol NaCl.

[0043] In some embodiments, the trace zinc sulfide-based multicolor luminescent material is prepared from the following raw materials in molar fractions: 0.2 mol of ZnS, 0.0001 mol of MnCl2, and 0.86 mol of NaCl.

[0044] In some embodiments, the trace zinc sulfide-based multicolor luminescent material is prepared from the following molar fractions of raw materials: 0.2 mol of ZnS, 0.00008 mol of MnCl2 and 0.86 mol of NaCl.

[0045] In some embodiments, the trace zinc sulfide-based multicolor luminescent material is prepared from the following molar fractions of raw materials: 0.2 mol of ZnS, 0.00006 mol of MnCl2 and 0.86 mol of NaCl.

[0046] In some embodiments, the trace zinc sulfide-based multicolor luminescent material is prepared from the following molar fractions of raw materials: 0.2 mol of ZnS, 0.00004 mol of MnCl2 and 0.86 mol of NaCl.

[0047] The following detailed description is provided in conjunction with specific embodiments.

[0048] Example 1: ZnS: 162 ppm Mn 2+ For example

[0049] A method for preparing trace amounts of zinc sulfide-based multicolor luminescent material includes the following steps:

[0050] S1: ZnS with a purity of 97wt%, MnCl2 with a purity of 98wt%, and NaCl with an AR concentration are ground and mixed to obtain a mixed powder, wherein NaCl is used as a grinding aid, and a layer of sodium chloride is laid on the top of the mixture as a protective molten salt; the mixed powder contains 0.2 mol of ZnS, 0.0002 mol of MnCl2, and 0.86 mol of NaCl;

[0051] S2: The mixture powder obtained in step S1 is placed in air at a temperature of 1000 ℃ for high-temperature sintering for 4 h, and then ground to obtain trace zinc sulfide-based multicolor luminescent material with an Mn ion content of about 162 ppm.

[0052] In this embodiment, the sintering method of the mixture in step S2 is as follows: heat up to 200 ℃ at 3 ℃ / min, then heat up to 1000 ℃ at 8 ℃ / min and sinter for 4 h, then cool down to 200 ℃ at 13 ℃ / min, and finally cool naturally to room temperature.

[0053] Example 2: ZnS: 121 ppm Mn 2+ For example

[0054] A method for preparing trace amounts of zinc sulfide-based multicolor luminescent material includes the following steps:

[0055] S1: ZnS with a purity of 97wt%, MnCl2 with a purity of 98wt%, and NaCl with an AR concentration are ground and mixed to obtain a mixed powder, wherein NaCl is used as a grinding aid, and a layer of sodium chloride is laid on the top of the mixture as a protective molten salt; the mixed powder contains 0.2 mol of ZnS, 0.00016 mol of MnCl2, and 0.86 mol of NaCl;

[0056] S2: The mixture powder obtained in step S1 is placed in air at a temperature of 1000 ℃ for high-temperature sintering for 4 h, and then ground to obtain trace zinc sulfide-based multicolor luminescent material with a Mn ion content of about 121 ppm.

[0057] In this embodiment, the sintering method of the mixture in step S2 is as follows: heat up to 200 ℃ at 3 ℃ / min, then heat up to 1000 ℃ at 8 ℃ / min and sinter for 4 h, then cool down to 200 ℃ at 13 ℃ / min, and finally cool naturally to room temperature.

[0058] Example 3: ZnS: 100 ppm Mn 2+ For example

[0059] A method for preparing trace amounts of zinc sulfide-based multicolor luminescent material includes the following steps:

[0060] S1: ZnS with a purity of 97wt%, MnCl2 with a purity of 98wt%, and NaCl with an AR concentration are ground and mixed to obtain a mixed powder, wherein NaCl is used as a grinding aid, and a layer of sodium chloride is laid on the top of the mixture as a protective molten salt; the mixed powder contains 0.2 mol of ZnS, 0.00014 mol of MnCl2, and 0.86 mol of NaCl;

[0061] S2: The mixture powder obtained in step S1 is placed in air at a temperature of 1000 ℃ for high-temperature sintering for 4 h, and then ground to obtain trace zinc sulfide-based multicolor luminescent material with a Mn ion content of about 100 ppm.

[0062] In this embodiment, the sintering method of the mixture in step S2 is as follows: heat up to 200 ℃ at 3 ℃ / min, then heat up to 1000 ℃ at 8 ℃ / min and sinter for 4 h, then cool down to 200 ℃ at 13 ℃ / min, and finally cool naturally to room temperature.

[0063] Example 4: ZnS: 88 ppm Mn 2+ For example

[0064] A method for preparing trace amounts of zinc sulfide-based multicolor luminescent material includes the following steps:

[0065] S1: ZnS with a purity of 97wt%, MnCl2 with a purity of 98wt%, and NaCl with an AR concentration are ground and mixed to obtain a mixed powder, wherein NaCl is used as a grinding aid, and a layer of sodium chloride is laid on the top of the mixture as a protective molten salt; the mixed powder contains 0.2 mol of ZnS, 0.00012 mol of MnCl2, and 0.86 mol of NaCl;

[0066] S2: The mixture powder obtained in step S1 is placed in air at a temperature of 1000 ℃ for high-temperature sintering for 4 h, and then ground to obtain trace zinc sulfide-based multicolor luminescent material with a Mn ion content of about 88 ppm.

[0067] In this embodiment, the sintering method of the mixture in step S2 is as follows: heat up to 200 ℃ at 3 ℃ / min, then heat up to 1000 ℃ at 8 ℃ / min and sinter for 4 h, then cool down to 200 ℃ at 13 ℃ / min, and finally cool naturally to room temperature.

[0068] Example 5: ZnS: 76 ppm Mn 2+ For example

[0069] A method for preparing trace amounts of zinc sulfide-based multicolor luminescent material includes the following steps:

[0070] S1: ZnS with a purity of 97wt%, MnCl2 with a purity of 98wt%, and NaCl with an AR concentration are ground and mixed to obtain a mixed powder, wherein NaCl is used as a grinding aid, and a layer of sodium chloride is laid on the top of the mixture as a protective molten salt; the mixed powder contains 0.2 mol of ZnS, 0.0001 mol of MnCl2, and 0.86 mol of NaCl;

[0071] S2: The mixture powder obtained in step S1 is placed in air at a temperature of 1000 ℃ for 4 h for high-temperature sintering, and then ground to obtain trace zinc sulfide-based multicolor luminescent material with a Mn ion content of about 76 ppm.

[0072] In this embodiment, the sintering method of the mixture in step S2 is as follows: heat up to 200 ℃ at 3 ℃ / min, then heat up to 1000 ℃ at 8 ℃ / min and sinter for 4 h, then cool down to 200 ℃ at 13 ℃ / min, and finally cool naturally to room temperature.

[0073] Example 6: ZnS: 60 ppm Mn 2+ For example

[0074] A method for preparing trace amounts of zinc sulfide-based multicolor luminescent material includes the following steps:

[0075] S1: ZnS with a purity of 97wt%, MnCl2 with a purity of 98wt%, and NaCl with an AR concentration are ground and mixed to obtain a mixed powder, wherein NaCl is used as a grinding aid, and a layer of sodium chloride is laid on the top of the mixture as a protective molten salt; based on the molar fraction of the mixed powder as 100%, the mixed powder contains 0.2 mol of ZnS, 0.00008 mol of MnCl2, and 0.86 mol of NaCl;

[0076] S2: The mixture powder obtained in step S1 is placed in air at a temperature of 1000 ℃ for high-temperature sintering for 4 h, and then ground to obtain trace zinc sulfide-based multicolor luminescent material with a Mn ion content of about 60 ppm.

[0077] In this embodiment, the sintering method of the mixture in step S2 is as follows: heat up to 200 ℃ at 3 ℃ / min, then heat up to 1000 ℃ at 8 ℃ / min and sinter for 4 h, then cool down to 200 ℃ at 13 ℃ / min, and finally cool naturally to room temperature.

[0078] Example 7: ZnS: 41 ppm Mn 2+ For example

[0079] A method for preparing trace amounts of zinc sulfide-based multicolor luminescent material includes the following steps:

[0080] S1: ZnS with a purity of 97wt%, MnCl2 with a purity of 98wt%, and NaCl with an AR concentration are ground and mixed to obtain a mixed powder, wherein NaCl is used as a grinding aid, and a layer of sodium chloride is laid on the top of the mixture as a protective molten salt; the mixed powder contains 0.2 mol of ZnS, 0.00006 mol of MnCl2, and 0.86 mol of NaCl;

[0081] S2: The mixture powder obtained in step S1 is placed in air at a temperature of 1000 ℃ for high-temperature sintering for 4 h, and then ground to obtain trace zinc sulfide-based multicolor luminescent material with a Mn ion content of about 41 ppm.

[0082] In this embodiment, the sintering method of the mixture in step S2 is as follows: heat up to 200 ℃ at 3 ℃ / min, then heat up to 1000 ℃ at 8 ℃ / min and sinter for 4 h, then cool down to 200 ℃ at 13 ℃ / min, and finally cool naturally to room temperature.

[0083] Example 8: ZnS: 25 ppm Mn 2+ For example

[0084] A method for preparing trace amounts of zinc sulfide-based multicolor luminescent material includes the following steps:

[0085] S1: ZnS with a purity of 97wt%, MnCl2 with a purity of 98wt%, and NaCl with an AR concentration are ground and mixed to obtain a mixed powder, wherein NaCl is used as a grinding aid, and a layer of sodium chloride is laid on the top of the mixture as a protective molten salt; the mixed powder contains 0.2 mol of ZnS, 0.00004 mol of MnCl2, and 0.86 mol of NaCl;

[0086] S2: The mixture powder obtained in step S1 is placed in air at a temperature of 1000 ℃ for high-temperature sintering for 4 h, and then ground to obtain trace zinc sulfide-based multicolor luminescent material with a Mn ion content of about 25 ppm.

[0087] In this embodiment, the sintering method of the mixture in step S2 is as follows: heat up to 200 ℃ at 3 ℃ / min, then heat up to 1000 ℃ at 8 ℃ / min and sinter for 4 h, then cool down to 200 ℃ at 13 ℃ / min, and finally cool naturally to room temperature.

[0088] Figure 1 The image shows the XRD pattern of the multicolor luminescent material zinc sulfide doped with manganese prepared in Example 1. Figure 1 The XRD pattern matched well with the PDF standard card (JCDP#05-0566), indicating the successful synthesis of the zinc sulfide sphalerite phase.

[0089] Figure 2 The multicolor luminescent material ZnS prepared in Example 1: 162 ppm Mn 2+ The excitation-emission spectrum mapping of PL shows that there are two emission centers in PL, and the responses of blue emission and orange emission change differently with wavelength.

[0090] Figure 3 The multicolor luminescent material ZnS prepared in Example 1: 162 ppm Mn 2+ The power-emission spectrum mapping of the photoplethysmography (PL) shows that the responses of blue and orange emission differ with increasing power. At low power, orange is dominant in the PL, while blue is dominant at high power.

[0091] Figure 4 The multicolor luminescent material ZnS prepared in Example 1: 162 ppm Mn 2+ The PL luminescence photograph shows that as the temperature increases, the PL color changes from blue to orange.

[0092] Figure 5 The multicolor luminescent material ZnS prepared in Example 1: 162 ppm Mn 2+ The PL spectra at different temperatures show that, with increasing temperature, the blue emission in PL is quenched while the orange emission remains relatively stable.

[0093] Figure 6 The multicolor luminescent material ZnS prepared in Example 1: 162 ppm Mn 2+ The changes in blue and orange emission intensities during a heating and cooling process, and the reversal of the PL color change with temperature after cooling.

[0094] Figure 7 The multicolor luminescent material ZnS prepared in Example 1: 162 ppm Mn 2+ The time-resolved PL spectrum after excitation was stopped showed a significant color change, with orange being relatively enhanced and blue being relatively weakened.

[0095] Figure 8 The multicolor luminescent material ZnS prepared in Example 1: 162 ppm Mn 2+ The responses to a variety of external stimuli are shown.

[0096] Figure 9 The devices for information encryption fabricated at 88 ppm and 162 ppm in Examples 1-8 and their performance are shown, demonstrating the information encryption capabilities of the devices.

[0097] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. 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 implemented in other specific forms without departing from its spirit or basic characteristics. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0098] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A zinc sulfide-based multicolor luminescent material, characterized in that, The multicolor luminescent material is zinc sulfide doped with manganese (ZnS:xMn). 2 + (x=20-162 ppm).

2. The zinc sulfide-based multicolor luminescent material according to claim 1, characterized in that, The multicolor luminescent material is prepared from ZnS, NaCl and MnCl2, with a molar ratio of 5000:1-5:21500.

3. A method for preparing zinc sulfide-based multicolor luminescent materials as described in any one of claims 1-2, characterized in that, Includes the following steps: S1: Grind and mix ZnS, NaCl and MnCl2 to obtain a mixed powder; S2: The mixture powder obtained in step S1 is sintered in air for 4 hours, and then ground to obtain the multicolor luminescent material zinc sulfide doped with manganese.

4. The method for preparing a zinc sulfide-based multicolor luminescent material as described in claim 3, characterized in that, The sintering method in step S2 is as follows: heat up to 300 ℃ at 3 ℃ / min, then heat up to 1000 ℃ at 8 ℃ / min and sinter for 4 h, then cool down to 200 ℃ at 13 ℃ / min, and finally cool naturally to room temperature.

5. An application of the zinc sulfide-based multicolor luminescent material as described in any one of claims 1-2.

6. The application of the zinc sulfide-based multicolor luminescent material as described in claim 5, characterized in that, Applications in the fabrication of anti-counterfeiting light-emitting devices and stimulation visualization.

7. The application of the zinc sulfide-based multicolor luminescent material as described in claim 6, characterized in that, The method for preparing the anti-counterfeiting light-emitting device is as follows: two concentrations of light-emitting materials are mixed evenly with PDMS colloid to obtain their respective mixed liquids. The two mixed liquids are evenly coated in a mold, sealed and covered, and then heated to cure the colloid. The cured film is cut and spliced ​​to obtain the information encryption light-emitting device.

8. The application of the zinc sulfide-based multicolor luminescent material as described in claim 7, characterized in that, In the mixed liquid, the mass percentage of the multicolor luminescent material is 30%-35%.

9. The application of the zinc sulfide-based multicolor luminescent material as described in claim 7, characterized in that, The heating and curing temperature is 80 ℃, and the curing time is 1-2 h.

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