The invention presents a photostable multifunctional organic-inorganic complex combining avobenzone (a common organic UV filter) with defect-rich zinc oxide nanocrystals (D-ZnO NCs). This complex forms a transparent, broadband UV-protective sunscreen layer that is photostable and emits visible light via defect luminescence. The luminescence not only offers enhanced skin brightening and camouflage of imperfections but also enables real-time monitoring of sunscreen application uniformity and sun protection factor (SPF). The technology supports personalized skincare formulations, optimizing UV protection and cosmetic benefits simultaneously. Additionally, the complex can be applied in UV protective coatings for solar cells, algae bioreactors, and other surfaces requiring visible-light UV protection.
Figure (1a) TEM images of C-ZnO NPs, the bottom right inset shows the HR-TEM of ZnO NPs, (1b) TEM image of D-QDs, the bottom right inset shows the HR-TEM of D-QDs; (2) Schematic showing the penetration of intense UVA emission from C-ZnO NPs till dermis and penetration of UVC, UVB and UVA without sunscreen; (3) Illustrates the use of defect emission from D-ZnO QDs for camouflaging the normal skin color
Traditional organic UV filters like avobenzone degrade under UV exposure, reducing sunscreen efficacy, thereby causing photoinstability. Additionally, there is a need for multifunctional sunscreen formulations that provide enhanced photoprotection, aesthetic skin brightening, and real-time application monitoring. Current sunscreens lack a way to measure application thickness and SPF on the skin, and do not offer customizable protection or cosmetic benefits for aging or blemished skin.
- Photostable Organic-Inorganic Complex: The technology integrates defect-rich ZnO quantum dots with avobenzone to form a highly photostable sunscreen complex, preventing the typical breakdown of organic UV filters under sunlight.
- Broadband UV Protection with Visible Transparency: Offers effective protection across UVA and UVB spectra while maintaining transparency on the skin, avoiding the white cast common with traditional mineral sunscreens.
- Defect-Induced Visible Luminescence for Skin Brightening: The nanocrystal defects emit visible light under UV radiation, enhancing skin appearance by brightening complexion and camouflaging imperfections.
- Non-Invasive Sunscreen Application Monitoring: The intensity of defect luminescence correlates with the thickness and uniformity of the applied sunscreen layer, enabling real-time assessment and personalized formulation adjustments.
- Stabilization of UV Filter Chemical Structure: Defect-rich ZnO nanocrystals stabilize the enol form of avobenzone, reducing photodegradation and thereby prolonging the sunscreen’s protective efficacy.
- Multifunctional Use beyond Cosmetics: The technology can be adapted for UV protective coatings in solar cells and algae bioreactors, enhancing renewable energy efficiency and sustainable biomass production through UV down-conversion.
The prototype is prepared by mixing a stable solution of defect-rich zinc oxide quantum dots (D-QDs) with controlled weight percentages of avobenzone, resulting in transparent and photostable topical formulations with tunable sun protection factors (SPF). Transmission electron microscopy (TEM) and spectral analyses confirm the presence of nanocrystal defects and their characteristic luminescence properties. The resulting coatings exhibit visible transparency and emit bright luminescence under UV excitation. Functional testing demonstrates excellent photostability upon UV exposure, with luminescence intensity correlating directly to sunscreen thickness, alongside notable cosmetic benefits such as skin brightening.
Process has been modified for ease of scale-up (for cost reduction) and successfully implemented with CFS for ease of integration into product line and overall cost effectiveness of the final product.
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This technology offers safer and more effective sunscreen options that not only protect against harmful UV radiation but also enhance skin appearance, promoting healthier skin across different age groups and skin types through tailored sun protection. Additionally, it contributes to sustainability by reducing UV damage to solar cells and algae cultures, supporting renewable energy and biomass production. By enabling application monitoring through luminescence, it may also improve sunscreen usage compliance, potentially lowering the incidence of UV-related skin diseases.
- Cosmetics and Personal Care: Advanced sunscreens with multifunctional protection and aesthetic benefits
- Dermatology: Personalized skincare products targeting aging and skin imperfections
- Renewable Energy: UV protective coatings for solar cells enhancing lifetime and efficiency
- Biotechnology: UV protection in algae bioreactors to increase biomass yields
- Coatings Industry: UV protective, visible light-emitting coatings for various surfaces
Geography of IP
Type of IP
16840997.7
3340962