Application of boron-containing organic material in anti-blue light product

Abstract

According to the invention, the existing MR organic molecules are used in the anti-blue light product, so that not only are the defects of broadband absorption, low light transmittance, color cast, instability and the like of the traditional absorption type anti-blue light material improved, but also the overall light stability and durability are improved by utilizing the structural advantages of the MR molecules. The blue-light-resistant transparent base material achieves precise narrow-band protection, long-term stable protection, excellent color reducibility and good compatibility with existing transparent base materials, and is suitable for various blue-light-resistant products such as spectacle lenses, screen protection films, vehicle-mounted glass, lighting lampshades and VR / AR optical elements.

Description

Technical Field

[0001] This invention relates to the field of organic optoelectronic materials, specifically to the application of a boron-containing organic material in blue light blocking products. Background Technology

[0002] With the widespread use of smartphones, tablets, computer monitors, and LED lighting, the human eye is exposed to high-energy short-wavelength blue light (approximately 400–450 nm) for extended periods. Studies have shown that blue light can cause visual fatigue, affect melatonin secretion, disrupt sleep rhythms, and may even damage the macula and retinal cells. Therefore, developing optical protective products that can effectively block harmful blue light (such as eyeglass lenses, display screen protectors, lampshades, and automotive glass) is of great significance.

[0003] There are currently three main types of blue light blocking technologies on the market:

[0004] Reflection / interference type: Selective reflection of blue light is achieved through optical interference of multilayer dielectric films, but the processing technology is complex, the angle dependence is strong, and interference colors are easily generated.

[0005] Absorption type: These products are doped with organic dyes or inorganic pigments, and achieve protection by absorbing blue light themselves. These products are commonly found in blue light blocking glasses and screen protectors for mobile phones.

[0006] Light conversion type: uses fluorescent or quantum dot materials to convert blue light into long-wavelength light, but introduces additional emitted light, affecting the accuracy of visual color.

[0007] Disadvantages of existing technology

[0008] Among the three types of technologies mentioned above, absorption-type blue light blocking products are the most widely used, but existing technologies have significant drawbacks:

[0009] Wide absorption bandwidth: Traditional organic dyes (such as azo dyes and carbazole dyes) or metal complexes exhibit broadband absorption in the 400-500nm range, resulting in reduced overall transmittance and a yellowish tint in imaging.

[0010] Insufficient selectivity: It is difficult to achieve precise selective blocking of harmful short-wavelength blue light (400-450nm), while lacking the ability to distinguish long-wavelength blue light (460-480nm), affecting normal visual perception.

[0011] Poor light stability: Most organic dyes are prone to photobleaching and fading under long-term exposure to ultraviolet and blue light, resulting in a decrease in protective performance.

[0012] Poor compatibility with the substrate: Dyes tend to migrate or aggregate in polymer substrates (such as PC, PMMA, PET), leading to coating cracking and uneven optical properties. Summary of the Invention

[0013] To address the problems of broadband absorption, insufficient selectivity, and poor photostability in existing blue light blocking materials, this invention proposes a novel application scheme using multi-resonance (MR) organic molecules as blue light blocking absorption layer materials. Although these MR materials were initially developed as deep blue emitting materials for OLEDs, their narrowband absorption characteristics in the 400–450 nm region make them highly suitable for precisely blocking harmful short-wavelength blue light.

[0014] This invention provides the application of boron-containing organic materials with the following structural formula in blue light blocking products.

[0015]

[0016] Among them, X and Y are independently selected from N, S, and O;

[0017] When X is S or O, there is no Ar4 substitution; when Y is S or O, there is no Ar3 substitution.

[0018] Ar1, Ar2, Ar3, and Ar4 are independently selected from aryl, substituted aryl, and carbazole aryl groups; ------- indicates bonding or no bonding; when ------- represents bonding, they are selected from the following:

[0019]

[0020] R is alkyl, aryl, substituted aryl, carbazole, substituted carbazole, diarylamine, or substituted diarylamine. In a preferred embodiment of the present invention, Ar1, Ar2, Ar3, and Ar4 are independently selected from:

[0021] In a preferred embodiment of the present invention, R is selected from:

[0022]

[0023]

[0024] In a preferred embodiment of the present invention, the blue light blocking product includes eyeglass lenses, screen protectors, architectural glass, automotive glass, lighting covers, protective glass, flexible optical elements, and optical sensor protective components.

[0025] In a preferred embodiment of the present invention, the boron-containing organic material is doped into a polycarbonate, polyester, acrylate or epoxy resin matrix in the form of a monomer, block or filler to form a composite material that can be processed into a transparent film.

[0026] In a preferred embodiment of the present invention, the structural formula of the boron-containing organic material is selected from the following:

[0027]

[0028]

[0029]

[0030]

[0031]

[0032]

[0033]

[0034]

[0035]

[0036]

[0037]

[0038] In a preferred embodiment of the present invention, the blue light blocking product includes eyeglass lenses, screen protectors, architectural glass, automotive glass, lighting covers, protective glass, flexible optical elements, and optical sensor protective components.

[0039] In a preferred embodiment of the present invention, the boron-containing organic material is doped into a polycarbonate, polyester, acrylate or epoxy resin matrix in the form of a monomer, block or filler to form a composite material that can be processed into a transparent film.

[0040] Implementing this invention has the following beneficial effects:

[0041] This invention combines MR organic molecules with transparent polymer substrates (such as PC, PMMA, PET, etc.) to form an optical protective layer, effectively reducing harmful blue light radiation while ensuring high transmittance and color fidelity. This solution not only improves upon the shortcomings of traditional absorptive blue light blocking materials, such as broadband absorption, low transmittance, color shift, and instability, but also utilizes the structural advantages of MR molecules to enhance overall photostability and durability.

[0042] Therefore, this invention achieves precise narrow-band protection, long-term stable protection, excellent color reproduction, and good compatibility with existing transparent substrates, making it suitable for various blue light protection products such as eyeglass lenses, screen protectors, automotive glass, lamp covers, and VR / AR optical components. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0044] The present invention will be further described in detail below with reference to the embodiments.

[0045] In recent years, a series of multi-resonance (MR) organic molecules have been reported in the field of organic light-emitting diodes (OLEDs). Although initially used in deep blue light-emitting devices, these materials typically exhibit narrow-band, strong absorption characteristics in the 400–450 nm region. Therefore, while these MR molecules are not new materials, their absorption spectral characteristics suggest that they can be reused in the field of blue light protection as highly selective blue light blocking optical shielding materials. By applying these known OLED materials to optical protective products, harmful short-wavelength blue light can be precisely blocked while maintaining high transmittance and good color reproduction. Furthermore, MR materials possess strong structural rigidity and high stability, making them more suitable than traditional dyes for maintaining stable optical performance under long-term use.

[0046] Example 1: Characterization of Blue Light Protection Performance

[0047] I. Purpose

[0048] To verify the performance advantages of the multi-resonance deep blue emitting organic material described in this invention in blue light protection, a standardized blue light protection test system was constructed to evaluate its blocking ability, total light transmittance, color fidelity, and long-term stability in the 400–450 nm short-wavelength blue light range, providing repeatable technical evidence for productization and patent protection.

[0049] II. Sample Preparation

[0050] 1. Material source and purification

[0051] The tested materials were 121 types of multi-resonance luminescent molecules, listed above as T-1 to T-121, all of which were purified by column chromatography and recrystallization, with an HPLC purity of ≥99%.

[0052] 2. Solution and Coating

[0053] The materials were dissolved in chloroform (0.1 wt%), filtered through a 0.22 μm filter membrane, and then spin-coated onto a 1.0 mm thick optical-grade polycarbonate (PC) substrate (2000 rpm, 30 s). The film was then dried in a vacuum oven at 80 °C for 2 h. The film thickness was approximately 150 nm.

[0054] 3. Control group

[0055] Samples were prepared under the same conditions using commercially available blue light blocking dyes (broad-spectrum azo system) for cross-sectional comparison.

[0056] III. Testing Methods

[0057] 1. Transmittance and absorption spectroscopy determination

[0058] Transmittance T(λ) in the 350–800 nm range was determined using a PerkinElmer Lambda 950 UV-Vis-NIR spectrophotometer.

[0059] 2. Blue Light Blocking Rate (BLR) Calculation

[0060]

[0061] Among them, I D65 (λ) represents the CIE standard daylight spectrum.

[0062] 3. Total light transmittance (Tv)

[0063] Visible light transmittance was calculated using the CIE 1931V(λ) light efficiency function with weighting.

[0064] 4. Color difference test

[0065] ΔE*ab was calculated using the CIE Lab color space to evaluate color deviation.

[0066] 5. Light stability test

[0067] The sample was placed under a 365nm ultraviolet light source (10mW / cm). 2 After continuous irradiation for 100 hours, the change in transmittance ΔT was measured.

[0068] IV. Summary Table of Test Results (T-1 to T-122)

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[0074] Performance Comparison Summary Table (MR Material vs. Control Group)

[0075]

[0076] V. Performance Discussion

[0077] 1. Absorption spectral characteristics

[0078] Test results show that all materials from T-1 to T-121 have clear absorption peaks in the 400–450 nm range, with half-peak widths concentrated at about 30 nm, and the absorption characteristics are concentrated and stable; the absorption peaks of the commercially available azo dyes in the control group are located at 435 nm and 470 nm, with half-peak widths of about 80 nm, showing broad-spectrum absorption characteristics.

[0079] 2. Blue Light Blocking Performance (BLR)

[0080] The blue light blocking rate of MR materials is concentrated in the range of 80-88%, which can effectively reduce the transmittance in the 400-450nm band; the blocking rate of the control group is about 90%, but its broadband absorption also has a significant impact on the 500-700nm visible light.

[0081] 3. Total light transmittance (T_v)

[0082] The weighted visible light transmittance of the MR material is above 90%, and the overall light transmittance performance remains high; the total light transmittance of the control group is about 85%, and the light transmission loss is more obvious.

[0083] 4. Color difference performance (ΔE*ab)

[0084] The ΔEab test value of MR materials is generally ≤1.0, which is close to the human eye's color difference perception threshold; the control group has a ΔEab of about 3.5, and color deviation is visible.

[0085] 5. Light stability

[0086] After 100 hours of irradiation with 365nm ultraviolet light, the transmittance of the MR material decreased by no more than 2%; the transmittance of the control group decreased by about 5%.

[0087] 6. Reproducibility and Applicability

[0088] The methods for material preparation, sample spin coating, optical testing, and stability evaluation are all based on standardized procedures, which are repeatable and operable, and can serve as a unified reference for performance evaluation of different material systems.

[0089] VI. Typical Application Scenarios

[0090] 1. Visual protection products

[0091] 1.1 Anti-blue light glasses and contact lenses: block high-energy short-wave blue light and reduce visual fatigue.

[0092] 1.2 High-end display protective film (mobile phones, tablets, computers, car HUDs): Significantly reduces blue light radiation without affecting the screen's color reproduction.

[0093] 2. Immersive devices and optical components

[0094] 2.1 VR / AR headsets and augmented reality waveguide devices: ensuring comfort and retinal safety during extended wear, while meeting requirements for high transparency and low chromatic aberration.

[0095] 2.2 Precision optical lenses and sensor front optical filters: protect imaging devices from damage by short-wavelength blue light.

[0096] 3. Smart glass for automotive and architectural applications

[0097] 3.1 High-end automotive interior glass and panoramic sunroof: Balancing blue light protection with high visible light transmittance, suitable for smart dimming windows.

[0098] 3.2 Energy-saving glass curtain wall for buildings: Combining the triple functions of blue light protection, heat insulation and UV protection, it meets the needs of health and energy saving.

[0099] 4. Medical and lighting devices

[0100] 4.1 Medical goggles and protective shields: Provide effective protection in situations with strong ultraviolet / blue light exposure (surgery, laboratory).

[0101] 4.2 High-end LED lighting lampshade: Reduces blue light hazards while maintaining the color rendering index of the light source.

[0102] VII. Overall Conclusion

[0103] This embodiment conducted systematic optical performance tests on multi-resonance deep blue emitting organic materials and established a repeatable evaluation process for blue light blocking capability. The results show that the T-1 to T-121 series materials exhibit clear absorption characteristics in the 400–450 nm wavelength band, with blue light blocking rates between 80–88%, and weighted visible light transmittance remaining above 90%. The color difference (ΔE*ab) is controlled within 1.0, and the transmittance decreases by no more than 2% after 100 hours of ultraviolet irradiation.

[0104] The control group of commercially available broadband azo blue light blocking dyes had a blocking rate of approximately 90%, but this was accompanied by a decrease in total light transmittance to 85% and significant color shift (ΔE*ab≈3.5), with a stability degradation of approximately 5%. Horizontal comparisons show that multi-resonance molecular materials exhibit concentrated narrow-spectrum absorption and higher transmittance and stability, and the process route and testing methods demonstrate good reproducibility.

[0105] Based on data analysis, this embodiment can directly support the application and development of materials in various products such as blue light blocking glasses lenses, display screen protective films, automotive and architectural glass, and VR / AR optical devices. The relevant experimental procedures can serve as a standard reference scheme for the future research and development of similar blue light blocking functional materials.

Claims

1. Use of a boron-containing organic material of the following structural formula in a blue light blocking article, wherein X, Y are independently selected from N, S, O; when X is S or O, Ar4 is not substituted; when Y is S or O, Ar3 is not substituted; Ar1, Ar2, Ar3, Ar4 are independently selected from aryl, substituted aryl, carbazolyl; represents a bond or no bond; when represents a bond, it is selected from the following: R is alkyl, aryl, substituted aryl, carbazole, substituted carbazole, diarylamine or substituted diarylamine.

2. Use according to claim 1, characterized in that, Ar1, Ar2, Ar3, Ar4 are independently selected from the following:

3. Use according to claim 1, characterized in that, R is selected from the following:

4. Use according to claim 1, characterized in that, The blue light blocking article includes eyeglass lenses, screen protection films, architectural glass, automotive glass, lighting covers, protective glass, flexible optical elements, optical sensor protection.

5. The use according to claim 1, characterized in that, The boron-containing organic material is doped in a polycarbonate, polyester, acrylate or epoxy matrix in the form of a monomer, block or filler to form a composite material that can be processed into a transparent film.

6. Use according to claim 1, characterized in that, The boron-containing organic material has a structural formula selected from the following:

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