415 results about "Light induced" patented technology

There are provided a display device and an electronic device. The display device comprises a substrate, a circuit layer, and an element layer. A sub-region of the substrate comprises a bending region. A display area of the substrate comprises emission areas, a non-emission area between the emission areas, and light sensing areas in portions of the non-emission area. The element layer comprises light emitting elements in the emission areas, and light sensing elements in the light sensing areas. The circuit layer comprises data bending lines disposed in the bending region and electrically connected to data lines; and read-out bending lines disposed in the bending region and electrically connected to read-out lines. The bending region comprises first wiring group areas in which two or more of the data bending lines are disposed; and second wiring group areas in which two or more of the read-out bending lines are disposed.

The invention discloses an MXene-based coating with a near-infrared light induction interaction effect and a preparation method of the MXene-based coating, and relates to the technical field of coatings. The preparation method comprises the following steps: a nano microcapsule and MXene powder are subjected to in-situ growth to form a composite dispersion liquid, the nano microcapsule is of a core-shell structure, a shell layer material is selected from at least one of polyaniline, polyurea, polyurethane, polyacrylate and silicon dioxide, a core contains a functional substance, and the surface of the core contains a porous material. The functional substances are selected from at least two of a corrosion inhibitor, a fluorescent indicator and a lubricant; adding a thermal reversible coating containing dynamic covalent bonds and a curing agent into the composite dispersion liquid, and uniformly mixing to form a homogeneous coating; and spraying the homogeneous coating on the surface of a base material, and curing to obtain the coating. The coating is high in mechanical strength, has a near-infrared light triggered self-repairing function, is high in self-repairing rate, and can realize multiple functions such as fluorescence labeling, corrosion early warning and lubrication coordinated regulation and control.

The invention relates to the technical field of lamps, in particular to a light sensor, a lamp and a using method. A light sensor includes: a condenser lens; a light sensor; the shell is provided with a containing space, a through hole is formed in the shell, the condensing lens and the light sensor are fixedly arranged in the containing space of the shell, part of the condensing lens is arranged in the through hole, the condensing lens and the light sensor are correspondingly arranged, the condensing lens is used for collecting light outside the shell, and the light sensor is used for sensing the light outside the shell. And the light sensor is used for sensing the change of the light rays collected by the condensing lens. The invention provides a light sensor, a lamp and a use method, and aims to solve the problems that a lighting element and a sensing element are fixed through two parts in the design process of an existing sensor, and in later assembly and use, due to the fact that the lighting element and the sensing element have installation errors, positioning of the lighting element and the sensing element is not accurate, and the cost is low. The use effect of the sensor is affected, and the experience is poor.

The utility model discloses a mirror cabinet with an ultraviolet sterilization function, and relates to the technical field of mirror cabinets. The cabinet comprises a cabinet body, the front end of the cabinet body is connected with a cabinet door through a hinge, the inner wall of the cabinet body is fixedly connected with a first vertical plate and a second vertical plate which can divide the interior of the cabinet body into three parts, and a supporting plate is fixedly arranged on the inner wall of the front end of the cabinet body close to the middle. According to the utility model, when the light-sensitive sensor detects that the ambient light is dark, the light-sensitive sensor sends a signal to the PLC control module to turn on the ultraviolet disinfection lamp, after the signal of the light-sensitive sensor is received, the PLC control module automatically turns on the ultraviolet disinfection lamp in the mirror cabinet to start ultraviolet sterilization treatment, and when the cabinet door is opened, the light is brightened, so that the ultraviolet disinfection lamp is turned off; when the mirror cabinet is used, the light induction sensor sends a closing signal, and the PLC control module immediately closes the ultraviolet disinfection lamp, so that people are prevented from being radiated by ultraviolet rays when using the mirror cabinet, and the cabinet body can be effectively sterilized.

The invention discloses an intelligent network connection electric vehicle lighting system. The intelligent network connection electric vehicle lighting system comprises a lighting lamp, a switch module, a light sensing module and a brightness adjusting module. The illuminating lamp and the light sensing module are arranged outside the vehicle, and the light sensing module is electrically connected with the illuminating lamp through the brightness adjusting module; the light sensing module is connected with a switch module; when the external brightness received by the light sensing module is higher than a preset value, the brightness of the illuminating lamp is reduced through the brightness adjusting module; when the external brightness received by the light sensing module is lower than a preset value, the brightness of the illuminating lamp is increased through the brightness adjusting module; the switch module can open or close the light sensing module. According to the intelligent network connection electric vehicle lighting system, the brightness of the lighting lamp can be automatically adjusted according to the intensity of external environment light, the electric quantity can be saved to the maximum extent, the endurance of an electric vehicle is improved, and the light sensing module can be turned on or turned off according to the requirements of a user.

The invention discloses a light-sensing external trigger signal output device for laser far-field parameter analysis, comprising: a light signal detector, used for collecting laser signals irradiated on a target plate and outputting a pulse current signal; a signal primary amplification module, used for converting the pulse current signal into a pulse voltage signal and amplifying the pulse voltage signal; a signal superposition amplification module, used for amplifying the pulse voltage amplification signal output by the signal primary amplification module again; a laser pulse signal judgment module, comprising a comparator, used for setting a signal judgment threshold value, the comparator being connected to a monostable trigger, and the monostable trigger sending a trigger signal when the pulse signal is greater than the signal judgment threshold value set by the comparator; an MCU main control module, used for interrupt processing, trigger signal delay and output frequency setting, trigger signal output and transmitting a timing control signal to an imaging camera; a power management module, connected to an external power supply and supplying power to the remaining modules.

The utility model discloses a photoelectric detector and a photoelectric sensing system, the photoelectric detector comprises a substrate layer, one side of the substrate layer close to an n-type electrode layer is provided with first grooves corresponding to contact columns, and the first grooves are respectively embedded with the corresponding contact columns; one side of the light sensing layer is fixedly connected with the substrate layer, the other side of the light sensing layer is provided with a plurality of second grooves, the light sensing layer comprises a light sensing area and a non-light sensing area, the light sensing area is used for absorbing incident light, and the second grooves are used for refracting and scattering the incident light; the p-type electrode layer is arranged on one side, far away from the substrate layer, of the non-photoinduction area; according to the photoelectric detector provided by the utility model, the sensitivity of the photoelectric detector can be improved.

The present disclosure provides a display panel and an electronic device. A pixel definition layer of the display panel is provided with multiple second openings corresponding to multiple light-sensing sensors, a metal inhibition layer of the display panel is laid in the multiple second openings, and a encapsulation layer of the display panel is disposed to cover the metal inhibition layer and fill into the multiple second openings. By providing the multiple second openings on the pixel definition layer, lights are capable of passing through the pixel definition layer to reach the multiple light-sensing sensors, thereby solving a problem that an existing under-screen optical fingerprint is difficult to be directly applied in OLED products.

A tamper detection system for detecting tampering of an enclosure of an electronic device is provided. The tamper detection system includes a light source and a light sensor both mounted inside the enclosure and connected to a tamper detection circuit. The light sensor is spaced apart and separate from the light source. The light sensor is configured to sense light emitted by the light source, the light sensed by the light sensor having a characteristic. A characteristic of the sensed light is stored during an initialization phase. During normal operation, the tamper detection circuit is configured to turn the light source on and off on a predetermined time interval. Tampering of the enclosure is detected when the light sensed by the light sensor does not compare favorably to the stored characteristic. In another embodiment, a method for detecting tampering is provided.

An electronic device includes a light sensing system and an at least partially translucent housing member positioned over at least the light sensing system. The housing member has an interior surface and an at least partially translucent exterior surface, wherein the interior surface includes multiple facets configured to direct light impinging on a translucent portion of the exterior surface toward the light sensing system. The facets are configured to create a prismatic effect, such as the effect produced by a Fresnel lens, that directs light toward the light sensing system. The light sensing system optionally includes a light sensor and / or a light guide. Where the electronic device is a lighting control device, the electronic device further includes a processor coupled to the light sensing system and operable to generate lighting control signals responsive to receipt of light sensing signals from the light sensing system.

This invention discloses an online multi-band photosensitive decoupling method for monitoring the forming process of micro-optical components. This method allows for online monitoring and correction of forming process parameters, controlling the forming scale of the micro-surface topology of optical components and diagnosing the operating conditions of equipment. The method includes the following steps: selecting process parameters based on desired height; acquiring multi-band illuminance curves of light during the processing from multiple angles online and extracting feature values ​​through decoupling; combining the correlation between photosensitive feature values ​​and process parameters from past experience data; predicting processing parameters in real time, including hot-pressing temperature, hot-pressing pressure, and holding time; characterizing the surface stress of micro-forming using thermal melting compression theory; and finally, correcting equipment conditions and controlling the micro-forming scale through a feedback control algorithm. This method enables efficient online prediction and diagnosis of multiple parameters in the micro-optical component forming process and solves the time-varying problem in the micro-optical component manufacturing process.

The invention relates to the technical field of marine aquaculture, in particular to marine intelligent purse seine aquaculture management equipment which comprises an automatic bait casting system, a water quality detection module, an underwater inspection module, an intelligent sensing module, a photovoltaic power supply system, a light inducing device and an informatization center control module. Through real-time monitoring and intelligent early warning, the risk of sudden change of water quality is reduced, accurate feeding is realized through combination of an automatic bait casting system and fish shoal behaviors, the bait utilization rate is improved, resource waste is reduced, the fish shoal state and the purse seine safety can be dynamically monitored through an underwater patrol module, management timeliness and visibility are enhanced, and the system is suitable for popularization and application. A photovoltaic power supply system and low-power-consumption equipment are adopted, the long-time stable operation capacity is achieved, and the device adapts to the complex open sea environment.

The invention discloses an intelligent ring system and a light interference suppression method thereof, and the system comprises a ring housing which is a circular ring with a ring cavity; the flexible printed circuit board is used for loading various electronic and non-electronic elements required by the ring system, and the flexible printed circuit board is arranged in the ring shell and is encapsulated and fixed through epoxy resin; the light-emitting module is composed of one or more wavelength light-emitting diodes, and the light-emitting module is coupled to the flexible printed circuit board; the light sensing module is composed of photodiodes, is coupled to the flexible printed circuit board and is matched with the light emitting module to complete PPG signal acquisition; the method has the beneficial effects that the optical crosstalk inside / outside the finger ring can be effectively inhibited, so that the quality of a finger PPG signal is optimized, the dependence on a signal processing algorithm is reduced, and finally the calculation accuracy of physiological indexes such as HR, SpO2, HRV and the like is improved.

A refrigerator comprises a refrigerator body, and a lock body and a refrigerator door are arranged on the refrigerator body. The lock body comprises a lock cylinder and a lock shell, and the inner space of the lock shell is divided into a lock cylinder area and a lock hook connecting area through a partition block. The lock cylinder comprises a lock tongue; an identification piece is arranged in the lock cylinder area; a light-emitting element is arranged in the lock cylinder area, a photoelectric sensor is arranged in the lock cylinder area, a shielding piece is arranged on the spring bolt, a control circuit board is arranged in the lock cylinder area, and the light-emitting element and the photoelectric sensor are both electrically connected with the control circuit board. According to the embodiment of the utility model, when the lock tongue moves to the first lock tongue position where the cabinet door can be locked, the shielding piece moving along with the lock tongue cuts off the light sensing signal of the photoelectric sensor, and the control circuit board is triggered to control the light-emitting element to illuminate the identification plate; a customer can determine whether the refrigerator door is locked or not according to whether the display window emits light or not, and economic losses of the customer due to the fact that the refrigerator is unlocked and commodities are lost are avoided.

The present invention provides a laser sensing device and a camera system, and relates to the field of camera device protection technology. By arranging a laser sensing device in a preset area, since the preset area is determined by an image acquisition device, the laser will first irradiate the preset area before irradiating the image acquisition device, so the laser irradiating the preset area can be collected by the laser collection component and the laser transmission component of the laser sensing device and transmitted to the laser sensor, and the laser sensor can detect the presence of the laser and send a signal of sensing the laser, so that the presence of the laser can be detected before the laser irradiates the image acquisition device and a signal can be sent in advance, so that the image acquisition device can make early warning preparations in advance.

A method and system for light induced transfer of components (15) from a donor substrate (10) to an acceptor substrate (20). The donor substrate (10) comprises a transparent carrier (11) configured to carry the components (15) facing the acceptor substrate (20), and a release stack (S). The release stack (S) comprises a light-absorbing layer (12), a decomposition layer (16), a melt layer (13), and an adhesive layer (14). The light-absorbing layer (12) has a high absorption coefficient for absorbing the light beam (L) causing heat conduction to the melt layer (13). The light-absorbing layer (12) remains solid while the melt layer (13) is melted. The adhesive layer (14) adheres the components (15) to the melt layer (13) while the melt layer (13) is solid and releases adhesion when the melt layer (13) is melted (M). The decomposition layer (16) has an evaporation temperature above the melting temperature of the melt layer, and forms a bubble (17) stimulating the release and transfer when the melt layer 913) is liquid.

The invention relates to the technical field of functional ink, in particular to metal ink based on near-infrared light induced photo-thermal synergistic curing and an additive manufacturing method of the metal ink. The ink is composed of 50%-90% of metal powder, 1%-35% of photosensitive resin, 1%-35% of photosensitive monomer, 0.1%-7% of photoinitiator, 0.1%-5% of upconversion material and 0%-2% of auxiliaries. The curing speed and the curing depth of the ink are improved through the photo-thermal synergistic effect of near-infrared light, the complexity of an ink formula is reduced, and support-free additive manufacturing of the metal ink can be achieved through real-time curing in the printing process. The photo-thermal synergistic curing can be realized without adding a thermal initiator, and meanwhile, the storage stability can be improved, the impurity content in a final product is reduced, and the quality is improved.

The invention relates to a roadway surrounding rock deformation monitoring device, system and method, and belongs to the field of industrial and mining equipment. According to the technical scheme, the roadway surrounding rock deformation monitoring device comprises a laser emitting assembly and a plurality of laser sensing assemblies, the laser emitting assembly comprises a plurality of laser emitting units, each laser emitting unit comprises a mounting frame, two laser positioning lamps are rotationally mounted in each mounting frame, and the multiple laser emitting units are arranged in the extending direction of a roadway; the laser induction assemblies are located in the projection directions of the multiple laser positioning lamps, and the multiple laser induction assemblies are electrically connected with the controller. According to the scheme, the laser emission unit is arranged to be a plurality of groups of paired laser positioning lamps, the projection angles of the laser positioning lamps are adjustable, and the laser induction assemblies with the corresponding number are matched, so that multiple positions of the surrounding rock of the roadway in one section are monitored, the monitoring is more comprehensive and perfect, and the reliability of monitoring data is improved; and the angle-adjustable form can adapt to roadways with different section shapes and sizes, so that the use is more flexible.

The invention relates to a method for locating or tracking individual emitters in a sample (2) using a light microscope (1), comprising illuminating the sample (2) with illumination light (B), wherein an intensity distribution of the illumination light (B) with a local intensity minimum is formed in the sample (2), and wherein the illumination light induces or modulates light emissions of an individual emitter in the sample (2), detecting light emissions of the individual emitter and determining position data of the individual emitter based on the detected light emissions.wherein, based on the detected light emissions, a wavefront of the illumination light is adjusted and / or a beam path of an illumination light beam (B) of the illumination light and a beam path of a detection light beam (D) of the light emissions are adjusted relative to each other and / or a beam path of the illumination light beam (B) and a beam path of another illumination light beam are adjusted relative to each other, as well as a light microscope (1) and a computer program for carrying out the procedure.

The novel beacon vessel comprises a base and further comprises a water flow power generation device and a solar power generation device which are installed on the base, the base is arranged to be cylindrical, a notch is formed in the middle of the base, an impeller of the water flow power generation device overhangs in the notch to rotate, and the cylindrical base rotates in real time in the water flow direction. A solar power generation device is mounted on the top surface of the base at the rear part of the notch, and is provided with a foldable turnover mechanism, so that a solar panel of the solar power generation device is always positioned at the optimal sunlight receiving angle; multi-source power generation is achieved through the water flow power generation device and the solar power generation device, redundant electric energy is stored for standby application and delivery while power is supplied to the beacon light and other electric equipment on the device, real-time data acquisition is achieved through the camera and the light induction sensor, and the device is simple and compact in structure, reliable in operation, low in cost, convenient to install and high in practicability. Power generation is stable and efficiency is high.

The invention provides a preparation method and application of a near-infrared light induction type silk fibroin nano preparation, and belongs to the technical field of medical preparations. And dropwise adding an ICG solution into the silk fibroin nano-particle solution, and then adding a ferric trichloride solution for reaction to obtain a precipitate, namely the near-infrared light induction type silk fibroin nano-preparation. The nano preparation prepared by the method disclosed by the invention can realize synergistic interaction of two treatment mechanisms, and the anti-tumor effect is remarkably improved.

The invention relates to the technical field of electrical fire monitoring, in particular to an electrical fire monitoring device and system.The electrical fire monitoring device comprises a sliding rail, a lamp strip is arranged at the bottom end of the sliding rail, a plurality of sets of lamps are evenly arranged on the surface of the lamp strip, grooves are formed in the top end and the bottom end of the sliding rail, a sliding groove is formed in the sliding rail, and the sliding rail is connected with the lamp strip. A sliding groove is formed in the upper portion of the base, a roller is arranged in the sliding groove, the size of the roller is slightly smaller than that of the sliding groove, one end of the roller is rotationally connected with a driving mechanism, one end of the driving mechanism is connected with a monitoring mechanism through a connecting column, and a smoke sensor is arranged at the bottom end of the driving mechanism. The rollers can be driven by the motor to quickly move in the sliding rails, whether injured persons exist at a fire point and a fire scene or not and the internal humidity and temperature of the fire scene and a fire source are quickly found, searchlighting can be conducted on the injured persons through light induction and a lamp belt, and an auxiliary effect is achieved for self-protection.

The invention discloses a cleaning system with ultraviolet light and a monitoring method, which are used for detecting the running state of an ultraviolet light tube of an autonomous mobile robot. The monitoring method for ultraviolet light elimination comprises the following steps: enabling the autonomous mobile robot to move at an advancing speed, driving a plurality of ultraviolet light tubes to emit ultraviolet light, obtaining a light-induced voltage value of each ultraviolet light tube, generating return information according to the light-induced voltage value of each ultraviolet light tube, and sending the return information to the autonomous mobile robot. And transmitting the return information to the monitoring platform by the autonomous mobile robot through the network. On the basis, the monitoring platform confirms and records the running state of each ultraviolet lamp tube according to the return information, and sends notification information to a specified client when any ultraviolet lamp tube is abnormal.

The utility model discloses an oil acid value detection sensor, and belongs to the technical field of oil detection, and the oil acid value detection sensor comprises a base, a shell and an acid value detection assembly. The base is connected with external equipment; the shell is arranged on the surface of the base, a main channel, a detection channel and two shunt channels are arranged in the shell, the main channel is flush with the detection channel, the two ends of each shunt channel are communicated with the main channel and the detection channel respectively, and the sectional area of the main channel is larger than that of each shunt channel; the sectional area of the shunting channel is larger than that of the detection channel; the acid value detection assembly comprises a light emitting module, a light filtering membrane and a light sensing module, the light emitting module is arranged on the surface of the shell and located on one side of the detection channel, the light sensing module is arranged on the surface of the shell, located on the other side of the detection channel and aligned with the light source, and the light filtering membrane is arranged between the detection channel and the light sensing module. According to the invention, the accuracy of acid value detection can be improved.

To provide an optical sensor capable of performing highly accurate optical sensing of a scene.SOLUTION: The optical sensor includes a unit D1 including x blocks 11, for example, three (x = 3) blocks a, b, and c, each having a plurality of pixels 12 arranged in a first direction 11A in a plan view. The pixels 12 are arranged at a pixel pitch D1 in the first direction P1. The three blocks a, b, and c are arranged side by side in a second direction D1 orthogonal to the first direction D2, and are arranged to be shifted from each other by P1 / 3 in the first direction D1. For example, the light receiving elements 11A and 10b each including the units 10a corresponding to the number of stages of the TDI are arranged so as to partially overlap each other in the D1 in the first direction, and the optical sensing is performed using the blocks a and b in which the positional deviation of the pixels 12 is minimized. In addition, by increasing the size of each of the light receiving elements 10a and 10b in the second direction D2, inclination at the time of mounting, poor connection, and the like are suppressed.SELECTED DRAWING: Figure 10

The invention discloses biological particle enrichment equipment, a biological particle enrichment device and a microdroplet generator. The droplet generator comprises a light sensing structure and a matching structure which are arranged at an interval, an attaching layer connected to the light sensing structure and the matching structure, and a piezoelectric piece arranged on the attaching layer. The droplet generator encloses and defines a sorting channel arranged along a flow direction. The attaching layer is provided with a sorting hole, and the sorting hole is communicated with the sorting channel in the liquid outlet direction perpendicular to the flowing direction. The piezoelectric piece and the sorting hole are arranged on the two opposite sides of the attaching layer in the liquid outlet direction respectively. The droplet generator defines a droplet firing area extending from the sorting hole to the piezoelectric member. Therefore, through the structural configuration of the micro-droplet generator, the piezoelectric piece can be adopted to quickly and accurately sort and enrich the biological particles.

This invention discloses an energy-saving control method for elevator light curtains and a low-power wireless communication light curtain, relating to the field of elevator control technology. The energy-saving control method for elevator light curtains includes: Step 1, establishing an energy-saving control environment, which includes: a camera, a light-sensing module, a controller, and a central control center. The central control center is used to regulate the operating status of each elevator. Step 2, establishing control logic, which includes: the central control center being configured to: if the current time is within a preset low-traffic period, acquire video data fed back by the camera; identify and analyze the number of people, their positions, and the items they are carrying in the elevator based on the video data; adjust the light curtain monitoring range based on the identification results; and output a light curtain adjustment control command to the corresponding controller. The controller is configured to: if it receives a light curtain adjustment control command, control the opening and closing of the corresponding number of transmitters; acquire monitoring signals fed back by the receiver; and control the elevator control system response based on the monitoring signals. This application has the effect of reducing energy consumption.

The invention discloses a display device and a display device control method.The display device comprises a display module, a control module, a gesture sensing module and a light sensing module, and the light sensing module is used for detecting the brightness of ambient light and generating an ambient light brightness signal; the control module is used for adjusting working parameters of the gesture sensing module according to the ambient light brightness signal; the gesture sensing module is used for sensing an instruction gesture made by a user and generating a corresponding sensing signal; and the control module is also used for generating a corresponding control signal according to the sensing signal and controlling the display module to display through the control signal. Therefore, the display device can be controlled by identifying the gesture of the user, so that diversified requirements in different scenes are met, the operation convenience is improved, the working parameters of the gesture sensing module are dynamically adjusted according to the ambient light brightness condition, the accuracy and reliability of instruction gesture identification can be improved, and the energy loss is reduced.

The utility model discloses a cloth inspecting machine defect marking device which comprises an installation frame, a winding roller and an unwinding roller, the winding roller and the unwinding roller are both installed on the installation frame, a detection frame is fixedly installed on the installation frame, a strip-shaped light-emitting plate is fixedly installed on the inner top wall of the detection frame, a light-receiving sensing plate is installed on the inner wall of the detection frame, and the strip-shaped light-emitting plate is fixedly installed on the strip-shaped light-emitting plate. The light-receiving sensing plate is located at the bottom of the strip-shaped light-emitting plate, and a processor is integrated in the mounting frame. According to the device, the strip-shaped light-emitting plate and the light-receiving sensing plate are matched to detect flaws of cloth conveyed at the bottom, a plurality of flaw positions can be marked through the marking assembly subsequently, subsequent repairing is facilitated, meanwhile, mark points are air-dried through the air drying assembly, it can be ensured that ink is completely dried before rolling, and the quality of the cloth is improved. Therefore, the ink is prevented from staining other parts of the cloth, the dried mark is firmer and is not easy to erase or fuzzy, and subsequent quality inspection and tracking are facilitated.

The invention discloses a wavelength selective photoresponse strontium-based metal organic framework eutectic material as well as a preparation method and application thereof. A metal node of the material is strontium ions, N, N '-bis (5-isophthalic acid) naphthalimide is used as a ligand, anthracene and a derivative thereof are used as objects, N, N-dimethylformamide is used as a solvent, and the material is obtained through solvothermal reaction. The material is composed of an electron donor (D) and an electron acceptor (A), and is a strontium-based MOF eutectic with an infinitely extended pi stacked A-D-D-A configuration. The MOF eutectic material has lattice characteristics of a tetragonal crystal system, a space group is I 41 / a, and cell parameters are a = b = 28.42240 (10), c = 13.71600 (10), and alpha = beta = gamma = 90 degrees. Sr-NDI at An has unique wavelength selective photoresponse property: ultraviolet light triggers [4 + 4] dimerization of an object anthracene, red light excites [4 + 2] reaction of anthracene and singlet oxygen, and near-infrared light induces generation of free radicals.