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The new generation of laser-based solid-state lighting (SSL) white light sources requires new material systems capable of withstanding, diffusing, and converting high intensity laser light. State-of-the-art systems use a blue light emitting diode or laser diode in combination with color conversion materials, such as yellow emitting Ce-doped phosphors or red and green emitting quantum dots (QD), to produce white light. However, for laser-based high-brightness illumination thermal management and uniform light diffusion are still major challenges in the quest to convert a highly focused laser beam into an efficient lighting solution. Here, we present a material system consisting of a highly open porous (> 99%) framework structure of hollow SiO2 microtubes. This framework structure enables efficient and uniform light distribution as well as ensuring good thermal management even at high laser powers of up to 5 W, while drastically reducing the speckle contrast. By further functionalizing the microtubes with halide perovskite QDs (SiO2@CsPbBr3 as model system) color conversion from UV to visible light is achieved. By depositing an ultrathin (~ 5.5 nm) film of poly(ethylene glycol dimethyl acrylate) (pEGDMA) via initiated chemical vapor deposition (iCVD), the luminescent stability of the QDs against moisture is enhanced. The demonstrated hybrid material system paves the way for the design of advanced and functional laser light diffusers and converters that can meet the challenges associated with laser-based SSL applications. [ABSTRACT FROM AUTHOR]

The integration of pressure quantification and visualization enhances pressure perception, accuracy, and efficiency. Current solutions require improvements in quantization accuracy, structural simplicity, and integration. We proposed a novel photonic skin comprising a 3 × 1 flexible optical fiber combiner, integrating red, green, and blue light emitting diode (LED) chips through three flexible optical fibers. Under pressure, changes in the optical fibers' transmission loss alter the output light intensity ratio, thus inducing a color shift at the combiner's output. This visible change can be precisely quantified using a color sensor chip. Performance metrics include sensing range up to 33N, sensitivity between 0.04 and 0.24 dB N−1, detection limit below 0.08 N, response time of 500 ms, recovery time of 400 ms, and durability exceeding 2000 cycles. A compact flexible circuit board manages light source driving, data acquisition, and wireless communication, forming a wearable photonic skin system. This system enables visual recognition and quantitative measurement of pressure across diverse scenarios, including different tactile modes, multi‐position pressure, finger bending, and neck movement. For oral occlusion force detection, the spatial separation of the sensing and visualization areas enables the system to simultaneously provide accurate measurements and intuitive visual assessment. [ABSTRACT FROM AUTHOR]

A yellowish‐green emitting phosphor Ba3YAl2O7.5:Eu2+ was synthesized by a solid‐state method. The crystal structure, luminescence, concentration quenching, fluorescence decay, and thermal quenching properties were systematically investigated. Under blue light (440 nm) excitation, Ba3YAl2O7.5:Eu2+ phosphors exhibit a yellowish‐green emission peaking at 550 nm with a full width at half maximum ∼ 69 nm, and The Commission Internationale de l'Eclairage (CIE) coordinates of Ba3YAl2O7.5:Eu2+ are (0.4064, 0.5811). Structural analysis and Van Uitert equation along with fluorescence lifetime analysis reveal that Eu2+ ions occupy 6‐coordinated Y and 9‐coordinated Ba sites in Ba3YAl2O7.5, and therefore generate two emission sub‐bands at 582 and 548 nm. In addition, Ba3YAl2O7.5:Eu2+ phosphor remaining 43% photoluminescence emission intensity at 125°C with an activation energy of 0.372 eV. Utilizing the title phosphor (Ba3YAl2O7.5:3%Eu2+), commercial red (Ca,Sr)AlSiN3:Eu2+ (CSAlSi:Eu2+) phosphor, and InGaN‐based blue light emitting diode (LED) chip, a proof‐of‐concept warm white LEDs (WLEDs) with a color rendering index of 80.1, CIE chromaticity coordinates of (0.411, 0.381), luminous efficacy of ∼ 22.13 lm/W, and correlated color temperature of ∼ 3288 K is achieved. Thus, Eu2+ activated Ba3YAl2O7.5 phosphors have the potential application in WLEDs pumped by a blue LED chip for solid‐state lighting application. [ABSTRACT FROM AUTHOR]

A yellowish‐green emitting phosphor Ba3YAl2O7.5:Eu2+ was synthesized by a solid‐state method. The crystal structure, luminescence, concentration quenching, fluorescence decay, and thermal quenching properties were systematically investigated. Under blue light (440 nm) excitation, Ba3YAl2O7.5:Eu2+ phosphors exhibit a yellowish‐green emission peaking at 550 nm with a full width at half maximum ∼ 69 nm, and The Commission Internationale de l'Eclairage (CIE) coordinates of Ba3YAl2O7.5:Eu2+ are (0.4064, 0.5811). Structural analysis and Van Uitert equation along with fluorescence lifetime analysis reveal that Eu2+ ions occupy 6‐coordinated Y and 9‐coordinated Ba sites in Ba3YAl2O7.5, and therefore generate two emission sub‐bands at 582 and 548 nm. In addition, Ba3YAl2O7.5:Eu2+ phosphor remaining 43% photoluminescence emission intensity at 125°C with an activation energy of 0.372 eV. Utilizing the title phosphor (Ba3YAl2O7.5:3%Eu2+), commercial red (Ca,Sr)AlSiN3:Eu2+ (CSAlSi:Eu2+) phosphor, and InGaN‐based blue light emitting diode (LED) chip, a proof‐of‐concept warm white LEDs (WLEDs) with a color rendering index of 80.1, CIE chromaticity coordinates of (0.411, 0.381), luminous efficacy of ∼ 22.13 lm/W, and correlated color temperature of ∼ 3288 K is achieved. Thus, Eu2+ activated Ba3YAl2O7.5 phosphors have the potential application in WLEDs pumped by a blue LED chip for solid‐state lighting application. [ABSTRACT FROM AUTHOR]

Achieving efficient blue electroluminescence (EL) is a crucial challenge for the commercial application of perovskite light-emitting diodes (LEDs), especially for pure blue light with wavelengths of 465~ 475 nm. The main factors contributing to the low efficiency of blue light perovskite LEDs are the high defect density and difficulties in carrier injection induced by the mixed halogen and dimensionality reduction strategies. Herein, we propose an approach for achieving high-performance pure-blue perovskite LEDs by incorporating a fluorine-containing phosphine oxide derivative (PFPO). This incorporation significantly suppresses the non-radiative recombination and fine-tunes the low-dimensional phase distribution of quasi-2D perovskites. The device results reveal that the maximum external quantum efficiency (EQE) of PFPO-treated perovskite LEDs has increased from 1. 83% to 3. 62%. The emission peak is located at 466 nm, corresponding to CIE of (0. 123, 0. 079), which is close to the International Telecommunication Union (ITU) Rec. 2020 blue standard (0. 131, 0. 046). [ABSTRACT FROM AUTHOR]

Synthesis of strongly quantum confined and emissive CsPbBr3 perovskite nanocrystals with sizes <4 nm has proven challenging owing to fast nucleation and rapid growth. In this work, ultra-small blue-emitting (∼461 nm) CsPbBr3 nanocrystals with an average particle size of 3.2 nm are synthesized via a high-temperature (170 °C) colloidal approach by controlling the supersaturation reaction conditions. Our approach yielded stable nanocrystals with uniform size, shape, and excellent color purity, making them promising for blue light emitting diode (LED) applications. [ABSTRACT FROM AUTHOR]

The application of non‐Cd quantum dots in future display technologies is promising due to their environmental friendliness. However, their low efficiency and broad emission linewidth limit their practical usage. Here, we report the fabrication of ZnSeTe quantum dots based blue light emitting diode (QLED) with different amounts of Te doping and top‐emitting structure. By regulating the thickness of the electron transport layer, we achieve electrical and optical balance control in QLED. Ultimately, we obtain a blue QLED with a emission wavelength of 461 nm, a current efficiency of 5.8 cd/A and a pure blue chromaticity coordinates of (0.13, 0.08). [ABSTRACT FROM AUTHOR]

Afresh synthesis of PPy/TiO2/SiO2 (PTS) nanocomposites via in situ chemical oxidation polymerization of pyrrole and by altering the weight ratio of TiO2/SiO2 nanosphere (TS Ns) is executed in this work. After a significant structural and morphological analysis, the nanocomposites were investigated for electrochemical behavior in 1 M H2SO4 adopting CV, GCD, and EIS measurements using three as well as two-electrode system setups. Results disclose that different feeding ratios of TS Ns, corresponding variation in PPy as well in synthesized nanocomposites play an important role in the enhancement of electrochemical properties. After a comparative study, it is observed that the PTS2 that is PPy:TS (w/w) as 50:50 sample at 10 mV/s scanning rate shows the highest specific capacitance, 499 F/g, and the value accords well with that of obtained through GCD findings (413 F/g) and the areal capacitance of the optimized electrode as 838.3 mF/cm2. PTS2 provided the energy density as 28.2 Wh/kg which is approximately 19 times more than that of neat PPy. The power density for PPy and PTS2 at 0.5 A/g current density was found to be 64.8 W/kg and 219 W/kg, respectively. Herein, the supercapacitor application gets strengthened with ideal capacitive behavior due to the high value (0.85) of “n” obtained through EIS findings and interpretation. It retained 92.23% of its initial current response even after covering ten thousand (10,000) charge–discharge rounds. Further, a device was assembled to show practical use of the best one configured electrode and charged for 5 min that could promptly illuminate the blue light emitting diode (LED) for 10 min.Schematical synthesis of PPy/TiO2/SiO2 NCs, electrode modification, and their electrochemical study for energy storage applicationGraphical abstract: Afresh synthesis of PPy/TiO2/SiO2 (PTS) nanocomposites via in situ chemical oxidation polymerization of pyrrole and by altering the weight ratio of TiO2/SiO2 nanosphere (TS Ns) is executed in this work. After a significant structural and morphological analysis, the nanocomposites were investigated for electrochemical behavior in 1 M H2SO4 adopting CV, GCD, and EIS measurements using three as well as two-electrode system setups. Results disclose that different feeding ratios of TS Ns, corresponding variation in PPy as well in synthesized nanocomposites play an important role in the enhancement of electrochemical properties. After a comparative study, it is observed that the PTS2 that is PPy:TS (w/w) as 50:50 sample at 10 mV/s scanning rate shows the highest specific capacitance, 499 F/g, and the value accords well with that of obtained through GCD findings (413 F/g) and the areal capacitance of the optimized electrode as 838.3 mF/cm2. PTS2 provided the energy density as 28.2 Wh/kg which is approximately 19 times more than that of neat PPy. The power density for PPy and PTS2 at 0.5 A/g current density was found to be 64.8 W/kg and 219 W/kg, respectively. Herein, the supercapacitor application gets strengthened with ideal capacitive behavior due to the high value (0.85) of “n” obtained through EIS findings and interpretation. It retained 92.23% of its initial current response even after covering ten thousand (10,000) charge–discharge rounds. Further, a device was assembled to show practical use of the best one configured electrode and charged for 5 min that could promptly illuminate the blue light emitting diode (LED) for 10 min.Schematical synthesis of PPy/TiO2/SiO2 NCs, electrode modification, and their electrochemical study for energy storage application [ABSTRACT FROM AUTHOR]

The LED Blue Light (LBL) (450 nm) effect on hormones levels and on jasmonates (JAs) metabolism in oranges was investigated. The quantum flux (2 days, 60 μmol m−2. s−1) was chosen for its efficacy in reducing postharvest rot caused by this crop's main postharvest phytopathogenic fungus (Penicillium digitatum). The analysis of abscisic (ABA), salicylic (SA) and indole-3-acetic (IAA) acids, and of JAs-related metabolites, revealed that LBL modifies all studied metabolites and had major effects on JAs levels, mainly on jasmonic acid (JA) and its precursor cis -(+)-12-oxo-phytodienoic acid (OPDA). This agrees with the up-regulation of the genes participating in their synthesis. Results highlight the relevance of CsLOX1 and CsLOX5 , and the contribution of CsAOC3 , in the LBL-induced OPDA biosynthesis, whereas CsOPR2 , CsACX1 and CsACX3 would play a part in the synthesis of JA from OPDA. Data also suggest that the applied LBL quantum flux favors fruit JA perception by increasing the expression of the coronatine insensitive 1 (COI1) receptor; and signaling by down-regulating abundant CsJAZ negative regulators. Differences in OPDA and JA between the LBL-treated oranges and their control fruit left in the dark disappeared after shifting the LBL-treated oranges to darkness for 3 more days. However, the LBL and darkness combination slightly increased IAA and SA contents. • Light emitting diodes blue light (LBL) modulates hormones content in citrus fruit. • LBL lowers ABA and IAA and the LBL + darkness combination increases IAA and SA. • OPDA, JA and MeJA LBL-induced accumulations are lost when fruit move to darkness. • LBL increases LOX1/5, AOC3, OPR2, ACX1/3 and ACOT transcripts accumulation. • LBL-mediated regulation may favor JAs perception and signaling in citrus fruit. [ABSTRACT FROM AUTHOR]

Anti-blue light films with high transparency and low haze that completely originate from renewable and biodegradable biomass materials for eye protection is a growing trend with great demand in the near future. Therefore, in this study, a natural bioactive ingredient, lutein, was incorporated into the cellulose matrix via a green and facile adsorption strategy to prepare biodegradable ultraviolet (UV) and blue light filters. The lutein/carboxymethylated cellulose films (L-CCFs) displayed high anti-UV capacity, with UV-A and UV-B blocking ratios of 52.7 %-90.9 % and 44.1–85.2 %, respectively. The composite films could block 83.1–97.8 % of blue light in the 400−500 nm region while maintaining high transparency (86.6–89.3 %) and low haze (2.1–2.6 %). By light absorption, the films can effectively shield blue light emitted by light-emitting diodes, sunshine, lighting systems, mobile phone, and computer screens. Quite encouragingly, the addition of lutein significantly increased the water contact angle from 40.1 to 70.5° and the composite films have excellent liquid barrier properties. Meanwhile, these films exhibit higher light stability than lutein powders, thus greatly extending the service life of the film as a blue light shielding material. Moreover, the films have excellent mechanical strength (>110 MPa) and biodegradability. These films prepared entirely from natural resources offer great application value in the fields of electronic screen films and spectacle lenses. [Display omitted] • High tensile strength lutein-cellulose films were prepared for eye protection. • Lutein-cellulose films demonstrated UV and blue light double-blocking capacity. • Lutein-cellulose films exhibited high optical transmittance and low haze. • Compositing with lutein could improve water contact angle of films. [ABSTRACT FROM AUTHOR]

Arrays of nanorod multi-quantum-well (MQW) blue light emitting diodes (nLEDs) with diameter 800 nm were prepared by reactive ion etching (RIE) with subsequent surface treatment by KOH etching alone, and KOH etching followed by SiO 2 passivation with the SiO 2 prepared by the sol-gel technique. In addition, the effects of Ag/SiO 2 core/shell nanoparticles prepared by sol-gel were studied for all surface treatments. For as etched nLEDs, the Internal Quantum Efficiency (IQE) of photoluminescence was low, 5.5 %, because of the impact of surface damage introduced by RIE. KOH etching and KOH plus SiO 2 passivation produced an increase of IQE to respectively 5.7 and 6.8 %. When the Ag/SiO 2 core/shell nanoparticles known to produce localized surface plasmon resonance at the wavelength well-matched to the light emission from the MQWs were added to the polymer filling the gaps between the MQW nanorods, the result was found to depend on finding a proper balance between the enhancement due to the interaction Ag/SiO 2 nanoparticles adjacent to the MQW nanorods and the absorption by "idle" Ag/SiO 2 particles in the bulk of the polymer. When optimal concentrations of LSP NPs giving rise to maximal enhancement of the MQW PL intensity were used, a considerable improvement of performance was obtained, with IQE of 10.6 %. • Arrays of blue light emitting diodes were prepared by reactive ion etching with subsequent KOH etching or SiO 2 passivation. • Effects of Ag/SiO 2 core/shell nanoparticles prepared by sol-gel were studied for all surface treatments. • For as etched nLEDs, the Internal Quantum Efficiency (IQE) was 5.5%. • KOH etching and KOH plus SiO 2 passivation produced IQE of respectively 5.7 and 6.8%. • When optimal concentrations of LSP NPs were used, IQE was 10.6%. [ABSTRACT FROM AUTHOR]

Induced resistance is considered as a sustainable strategy to control postharvest decay of fruits, while light emitting diodes (LEDs) as a green physical technology are of more and more interest in postharvest fruit preservation field. In this study, we evaluated for the first time the resistance inducing ability of LED irradiation with different light wavelengths and photoperiods for cherry tomatoes (Solanum lycopersicum L. 'Qianxi'). Results indicated the exposure to 40 W m-2 of four light wavelengths for 3 d decreased B. cinerea lesion diameter on harvested cherry tomatoes, notably the best effect in blue light (470 nm). Meanwhile, the mechanism of blue light-induced disease resistance is the enhancement of defense-enzyme activity and the expression of defense-related genes. Moreover, results revealed that blue light enhanced vitamin C content and the firmness of the fruit exocarp, suggesting the potential usage of blue light in the postharvest preservation of cherry tomatoes. • LEDs of different wavelengths in inducing disease resistance of fruits were studied. • The best results were obtained by blue light continuously at 40 W m-2 for 3 d. • Blue light enhanced the activities of defense enzymes and antioxidant enzymes. • Blue light maintained soluble solids, vitamin C content and peel hardness. [ABSTRACT FROM AUTHOR]

• CsPbBr 3 nanocrystals were readily prepared on a gram-scale. • Visible-light-induced selective oxysulfenylation of alkenes. • Diverse substituted β -hydroxysulfides and β -oxosulfides with high efficiency and regioselectivity were obtained. • Investigations were carried out to reveal the mechanism. Lead halide perovskites are promising candidates for efficient phtocatalysts in organic synthesis due to their attractive properties in light absorption, photogenerated charge transportation, and utilization. We report herein the development of photoinduced selective oxysulfenylation of alkenes using CsPbBr 3 nanocrystals that is visible light-responsive, easy-to-prepare, and cost-effective. Under blue light-emitting diode (LED), a series of alkene substrates are demonstrated to be highly efficient reaction partners to couple with disulfides tolerated with various functional groups, affording diverse β -hydroxysulfides and β -oxosulfides with excellent yields and high selectivity. Mechanism investigation shows that the visible-light induces the generation of thiyl radicals to initiate the reaction, followed by radical addition and oxygenation to form hydroperoxy sulfides intermediate, which selective convert to β -oxo sulfideos and β ‑hydroxy sulfides. The work provides a new exploration of the rational utilization of CsPbBr 3 nanocrystals to achieve selective oxysulfenylation of alkenes, displaying the great potential of perovskites for radical chemistry via photocatalysis. [Display omitted] The photoinduced selective oxysulfenylation of alkenes has been developed by using CsPbBr 3 nanocrystals that is visible light-responsive, easy-to-prepare, and cost-effective, in which the heterogeneous photocatalyst can be recycled at least five times without a substantial decrease in photocatalytic efficiency. [ABSTRACT FROM AUTHOR]

• Zinc gallate was synthesized by Bio mediated route using Leucas aspera extract. • Structural, Phase diagram, Optical and Latent fingerprint analysis was performed. • The might be a potential candidate for display technology, cool blue light emitting diodes, florescence boards and in forensic science. [Display omitted] For the first time, Zinc Gallium Oxide is synthesized using L e u c a s A s p e r a leaves extract as a reducing agent followed by the calcination at 500 ∘ C. The structural, morphological, and optical properties are discussed. The Bragg reflections confirm that ZGO gets crystallized in pure cubic form. The surface morphology consists of agglomerated NPs. The direct energy band gap was found to be 3.1 eV. The photoluminescence analysis excited under 233 nm, and CIE values fall in the blue region of visible spectra. The CCT value was found to be 2748 K which might find an application as a nanophosphor in warm light-emitting diodes. Further, the powder dusting method was employed to collect the latent fingerprints (LFPs) on the pores and non-pores surfaces under UV as well as in day light. The synthesized ZGO exhibits well-resolved ridge patterns that can be used to identify LFPs with clarity. From all these results, the present synthesized ZGO NPs might find an application in display technology as a blue nanophosphor material and for LFP detection in crime investigation. [ABSTRACT FROM AUTHOR]

To investigate the effects of trifluoromethyl and tert -butyl moieties on the general optoelectronic properties of star-shaped hosts based on phenyls substituted carbazole, we used 3,6,9-tris (4-(tert -butyl)-phenyl)-9 H -carbazole (M1) as a reference, and different numbers of electron-withdrawing 3,5-bis(trifluoromethyl) benzene were introduced into 3, 6 and 9 positions of carbazole to obtain compounds 9-(3,5-bis(trifluoromethyl)phenyl)-3,6-bis(4-(tert -butyl)phenyl)-9 H -carbazole (M3) , 3,6-bis(3,5-bis(trifluoromethyl)phenyl)-9-(4-(tert -butyl)phenyl)-9 H -carbazole (M5) and 3,6,9-tris(3,5-bis(trifluoromethyl)phenyl)-9 H -carbazole (M6). After the introduction of 3,5-bis (trifluoromethyl) benzene, the thermal temperature at 5 % mass loss of M3 , M5 and M6 decreased to 344 °C, while the glass transition temperature and melting point of M3 and M5 showed a significant increase. However, M6 did not show obvious glass transition, but its melting point also showed a significant increase. M3 crystallized at 125 °C as evidenced by differential scanning calorimetry, and the linking model of M3 is helpful to crystalize. In addition, when compared with those of M1 , the fluorescence emission peaks of M3 and M6 showed a blue-shift, while M5 showed a red-shift, all of which were in the deep blue emission range. The color purity of blue light for M1 in tetrahydrofuran solution is the highest, and M1 exhibit aggregation-induced emission characteristics. Compared to the photoluminescence quantum efficiency (PLQY) of compound M1 of 39 % in toluene, the PLQYs of M3 and M6 decreased to 34 % and 29 %, and the PLQY of M5 increased to 46 %. The function of the lowest unoccupied molecular orbital trap of M3 film under the external electrical field will increase, which not only offsets the increasing effect of the electrical field to the electron carrier and further decreases the carrier mobility when the electrical field increase, and the same situation is also feasible for the highest occupied molecular orbital traps in M5 , M6 and M1. The organic blue light emitting diodes were prepared by using M1 , M3 , M5 and M6 as the hosts of bis [2-(4,6-difluorophenyl)pyridinato-C2,N](picolinato)iridium, and the optimized device of M1 as the host showed the best performance with a maximum luminescence brightness of 2978 cd/m2, maximum current efficiency of 39.42 cd/A and maximum external quantum efficiency of 18.36 %. • Trifluoromethyl decreased the thermal-stability of the hosts. • 3,5-bis(trifluoromethyl) benzene tri-substituted host emitted light more effectively. • 3,5-bis(trifluoromethyl) benzene improved the electron-injecting ability of the hosts. • 3,5-bis(trifluoromethyl) benzene mono-substituted M3 made the charge mobilities to change oppositely relative to the others. • M1 without 3,5-bis(trifluoromethyl) benzene showed aggregation-induced emission characteristic and better device performance. [ABSTRACT FROM AUTHOR]

MgO-ZnO-Ga 2 O 3 nanocomposites are synthesized by solution combustion method using Aloe Vera gel as a reducing agent to increase the efficiency of blue emission. The appearance of Bragg reflections corresponding to MgO, ZnO and Ga 2 O 3 clearly indicates the formation of nanocomposites. The surface morphology consists irregular shape and sized NPs. The Energy dispersive X-ray analysis confirms the purity of the sample. The band energy gap was tuned to 3.1 eV. The Photoluminescence excitation and emission spectra was discussed and compared it with emission spectra of individual oxides as well as with other reported blue emitted nanophosphors. Further, the chromaticity coordinates and Color correlated temperature coordinates clearly confirms their warm blue emission. Further, the powder dusting method was employed to collect the latent fingerprints on the pores and non-pores surfaces. The synthesized MgO-ZnO-Ga 2 O 3 nanocomposites exhibits well-resolved ridge patterns that can be used to identify latent finger prints with clarity. From all these results, the present synthesized MgO-ZnO-Ga 2 O 3 nanocomposite might find an application in display technology as a blue nanophosphor material and for latent finger print detection in crime investigation. [Display omitted] • Mgo-ZnO-Ga 2 O 3 nanocomposite was synthesized by Bio mediated route using Aloe Vera extract. • Structural, Phase diagram, Optical and Latent fingerprint analysis was performed. • The might be a potential candidate for display technology, cool blue light emitting diodes, florescence boards and in forensic science. [ABSTRACT FROM AUTHOR]

[Display omitted] • Blue LED light inhibits S. aureus by excitation of endogenous PS. • Curcumin and riboflavin have synergistic antimicrobial activity in PDT. • PDT causes membrane deformations and ruptures with loss of cytoplasmic content. • PDT reduces S. aureus in milk and does not change macronutrient composition. • PDT is a promising method to inhibit foodborne bacterial pathogens. Foodborne bacterial pathogens such as Staphylococcus aureus (S. aureus) are a threat due to the progressive resistance of microorganisms to multiple drugs. In this sense, photodynamic therapy (PDT) is an innovative food decontamination technique based on the combination of a photosensitizer compound (PS), light of adequate wavelength, and molecular oxygen. The reactive oxygen species (ROS) produced are responsible for non-specific cell damage and make the development of resistance unlikely. The objective was to determine the cell viability of S. aureus ATCC 25923 submitted to PDT mediated by Riboflavin (RIB) and Curcumin (CUR) in vitro and in fluid milk. The structural damage responsible for the death of the bacteria was investigated. In milk, lighting was tested by two methods: thin layers and constant agitation. The effects of the treatments on the composition, oxidation, and color of the product were also investigated. The blue light emitting diode (LED) inhibits S. aureus even in the absence of PS. CUR and RIB demonstrated synergistic antimicrobial activity, increasing the efficiency of PDT. CUR was more efficient than RIB, inhibiting 7 log CFU/mL at concentrations above 62.50 μg/mL in vitro. PDT caused cell death through oxidation and disruption of the bacterial membrane. Despite the considerable photoinhibition in milk (1.63 log CFU/mL), the physiological environment of this matrix impaired the efficiency of the technique. Both lighting methods reduced the bacteria counts. There was no change in macronutrients composition and protein oxidation. However, light caused lipid peroxidation and PS pigmented the milk. Therefore, PDT is efficient to inhibit bacterial pathogens and can be used as a complement to traditional food preservation technologies. [ABSTRACT FROM AUTHOR]