186 results about "Luminescence spectra" patented technology

Provided is a white organic light emitting device including an anode, a cathode and an organic layer disposed therebetween, the organic layer having a structure wherein an arrangement of a green emissive layer and a blue emissive layer is formed on both surfaces of a red emissive layer such that the resultant structure is symmetrical around the red emissive layer, and a spacer layer is disposed between opposing surfaces of the blue emissive layer and the green emissive layer, where the white organic light emitting device including this structure exhibits a constant luminescence spectra irrespective of any change in current density. A method of forming the white organic light emitting device is also disclosed.

A sandwich device was prepared by electrodeposition of an insoluble layer of oligomerized tris(4-(2-thienyl)phenyl)amine onto conducting indium-tin oxide coated glass, spin coating the stacked platinum compound, tetrakis(p-decylphenylisocyano)platinum tetranitroplatinate, from toluene onto the oligomer layer, and then coating the platinum complex with aluminum by vapor deposition. This device showed rectification of current and gave electroluminescence. The electroluminescence spectrum ( lambda max=545 nm) corresponded to the photoluminescence spectrum of the platinum complex. Exposure of the device to acetone vapor caused the electroemission to shift to 575 nm. Exposure to toluene vapor caused a return to the original spectrum. These results demonstrate a new type of sensor that reports the arrival of organic vapors with an electroluminescent signal. The sensor comprises (a) a first electrode; (b) a hole transport layer formed on the first electrode; (c) a sensing / emitting layer formed on the hole transport layer, the sensing / emitting layer comprising a material that changes color upon exposure to the analyte vapors; (d) an electron conductor layer formed on the sensing layer; and (e) a second electrode formed on the electron conductor layer. The hole transport layer emits light at a shorter wavelength than the sensing / emitting layer and at least the first electrode comprises an optically transparent material.

A light emitting device is disclosed that emits light from the surface in a broad spectral range and in a broad range of angles tilted with respect to the direction normal to the exit surface. An apparatus for generating wavelength-stabilized light is formed of a light-emitting device, an external cavity and at least one external mirror. Light emitted by the light-emitting device at a certain preselected angle, propagates through the external cavity, impinges on the external mirror and is reflected back. Light emitted at other angles does not impinge on the external mirror. Thus, a feedback occurs only for the light emitted at a preselected angle. Light impinged on the external mirror and reflected back undergoes interference with the emitted light. The interference can be constructive or destructive. Constructive interference results in a positive feedback. The positive feedback occurs, if light emitted by the light-emitting device is reflected back and reaches the active region in phase, i.e. if the phase matching between emitted and reflected light waves occurs. The positive feedback conditions are met at one or a few selected wavelengths within the luminescence spectrum of the active region. Then the apparatus generates wavelength-stabilized light. In different embodiments, an apparatus may operate as a wavelength-stabilized light-emitting diode, a wavelength-stabilized superluminescent light-emitting diode, or a wavelength-stabilized laser.Various embodiments are possible which are distinguished in a way of optical coupling between a light-emitting device and an external mirror. The coupling can be realized via the far-field zone of the light emitted by the light-emitting device, via the near-field zone, or via a single epitaxial structure.An apparatus for the frequency conversion is disclosed further comprising a non-linear crystal located within the external cavity.

A white electroluminescent device realized by carbon quantum dots comprises a transparent sealing layer, a carbon quantum dot fluorescent layer, a transparent conductive layer, a light-emitting layer and a back conductive layer. The white electroluminescent device is characterized in that the carbon quantum dot fluorescent layer comprises carbon-containing nano fluorescent materials, has a light absorption range of 365-520 nm and a light emission range of 440-610 nm, and is used for converting the luminescent spectrums of the light-emitting layer into white light.

The present invention provides a white light source comprising: a light emitting diode (LED) having a light emission peak wavelength in a range of 350 or more and 420 nm or less; and a phosphor layer including four or more types of phosphors and resin, wherein the white light source satisfies a relational equation of: −0.2≦[(P(λ)×V(λ)) / (P(λmax1)×V(λmax1))−(B(λ)×V(λ)) / (B(λmax2)×V(λmax2))]≦+0.2, assuming that: a light emission spectrum of the white light source is P(λ); a light emission spectrum of black-body radiation having a same color temperature as that of the white light source is B(λ); a spectrum of a spectral luminous efficiency is V(λ); a wavelength at which P(λ)×V(λ) becomes largest is λmax1; and a wavelength at which B(λ)×V(λ) becomes largest is λmax2, and wherein an amount (difference) of chromaticity change on CIE chromaticity diagram from a time of initial lighting up of the white light source to a time after the white light source is continuously lighted up for 6000 hours is less than 0.010. According to the above white light source, there can be provided a white light source capable of reproducing the same light emission spectrum as that of natural light.

The invention discloses a quantum dot electroluminescent device, which comprises a light emitting layer. The light emitting layer comprises a quantum dot material and a thermally-activated delayed fluorescence (TADF) material; and after the luminescent spectrum of the thermally-activated delayed fluorescence material and the absorption spectrum of the quantum dot material are subjected to normalization, the difference of wavelengths corresponding to wave crests is within 50 nm. The TADF material in the light emitting layer of the quantum dot electroluminescent device can effectively convert triplet excitons to singlet excitons, the singlet excitons are then transmitted to quantum dots through Forster fluorescence resonance energy transfer, the quantum dots are excited to emit light, and the current efficiency of the quantum dot electroluminescent device is thus improved.

The invention belongs to the technical field of bio-analytical detection and discloses a fluorescent compound with aggregation-induced luminescence properties and application thereof to the cell fluorescence imaging field. The fluorescent compound with the aggregation-induced luminescence properties adopts one of structures shown as a formula 1 to a formula 4. The fluorescent compound with the aggregation-induced luminescence properties almost does not emit light or emit weak fluorescence in a solution state, can obtain the strong fluorescence emission aggregation-induced luminescence properties in solid state and aggregation states, has room temperature phosphorescent emission properties in a crystalline state, is simple to prepare and wide in luminous spectrum range, is applied to cell fluorescence imaging, biological analysis and other fields, has the characteristics of being sensitive and quick in cell dyeing, small in cytotoxicity, excellent in fluorescence signal anti-photobleaching properties and capable of in-situ real-time monitoring, and has practical application values.

The invention relates to a quantitative measurement method for the absolute photoluminescence quantum efficiency of near infrared quantum shear, relates to the field of the absolute luminous efficiency measurement of quantum shear materials, and solves the problems that the current measurement method adopting the theoretical quantum efficiency can only relatively evaluate the performance of the quantum shear materials, and the accuracy of measurement is low; as a result, the quantum shear materials cannot be absolutely evaluated. The quantitative measurement method comprises the following steps: putting a standard lamp into an integrating sphere of an integrating sphere detection system, and measuring the luminescence spectrum of the standard lamp to obtain the response function of the integrating sphere detection system; respectively causing laser to radiate into the empty integrating sphere, to radiate into the integrating sphere and not to directly radiate onto a sample and to radiate into the integrating sphere and to directly radiate onto the sample, thus obtaining spectrums of output laser of the integrating sphere and sample fluorescence under the three conditions; calibrating the spectrums of output laser of the integrating sphere and sample fluorescence, converting the calibrated spectrums to photon number distribution spectrums, carrying out integration on the photon number distribution spectrums, and computing to obtain the absolute quantum efficiency eta. The quantitative measurement method is applied to the field of quantitative measurement.

The invention relates to a white OLED (Organic Light Emitting Diode) luminophor which is characterized in that the electroluminescence spectrum of the OLED luminophor at least comprises blue luminescent component with the Y value of the CIE (Commission International Eclairage) chromaticity coordinate smaller than 0.55. The white OLED luminophor further comprises a transparent base plate on which transparent conducting electrode layers of the OLED luminophor are distributed; color transformation material capable of transforming the electroluminescence of the OLED luminophor to photoluminescence is arranged between a reflecting electrode layer and the transparent base plate of the OLED luminophor; after being reflected by the reflecting electrode layer, the photoluminescence emits towards the transparent base plate at a right angle; and the photoluminescence emitted from the transparent base plate is mixed with the electroluminescence emitted from the transparent base plate to form white luminescence. The white OLED luminophor is high in yield and low in production cost, and can be applied in white OLED lighting field or be used as a liquid crystal backlight source.

The present invention provides a white light source comprising a blue light emitting LED having a light emission peak of 421 to 490 nm and satisfying a relational equation of−0.2≦[(P(λ)×V(λ)) / (P(λmax1)×V(λmax1))−(B(λ)×V(λ)) / (B(λmax2)×V(λmax2))]≦+0.2,assuming that: a light emission spectrum of the white light source is P(λ); a light emission spectrum of black-body radiation having a same color temperature as that of the white light source is B(λ); a spectrum of a spectral luminous efficiency is V(λ); a wavelength at which P(λ)×V(λ) becomes largest is λmax1; and a wavelength at which B(λ)×V(λ) becomes largest is λmax2. According to the above white light source, there can be provided a white light source capable of reproducing the same light emission spectrum as that of natural light.

The invention relates to a deep ultraviolet laser photoluminescent spectrometer, which comprises a full solid deep ultraviolet laser, a vacuum sample chamber, a vacuum monochrometer, a first vacuum maintaining system, a second vacuum maintaining system, a low-temperature system, a temperature control device, a sample frame three-dimensional adjusting device, a stable state emission spectrum detection system, a time resolution spectrum detection system, a vacuum leakage safety system and a computer control device, wherein the vacuum sample chamber is connected with the full solid deep ultraviolet laser; the vacuum monochrometer is connected with the vacuum sample chamber; the first vacuum maintaining system is connected with the vacuum sample chamber; the second vacuum maintaining system is connected with the vacuum monochrometer; the low-temperature system and the temperature control device and the vacuum sample chamber are connected by a flange; the sample frame three-dimensional adjusting device is connected with the vacuum sample chamber; the stable state emission spectrum detection system is connected with the vacuum monochrometer; the time resolution spectrum detection system is connected with the vacuum monochrometer; the first control end and the second control end of the vacuum leakage safety system are connected with the first vacuum maintaining system, the third control end and the fourth control end of the vacuum leakage safety system is connected with the second vacuum maintaining system, and the fifth control end of the vacuum leakage safety system is connected with the low-temperature system and the temperature control device; and the computer control device is used for controlling the vacuum leakage safety system, the vacuum monochrometer, the low-temperature system, the temperature control device, the sample frame three-dimensional adjusting device, the stable state emission spectrum detection system and the time resolution spectrum detection system.

The invention discloses a spectrum feedback dimming colorimetric light box. The spectrum of a light source is adjusted by arranging a spectrum measurement device and utilizing the real-time feedback regulation mechanism of a feedback control device, so that the spectral power distribution of the light source meets the preset requirement, a higher rendering index is realized, and multiple types and occasions of light sources can be generated by accurate simulation; in the whole process, the luminescence spectrum of the light source is actually measured, so that the reliability of the adjustment result is guaranteed; a great deal of light source data does not need to be stored in advance, and the luminescence spectrum of the light source can be accurately adjusted; furthermore, the spectrum measurement device is flexibly arranged, so that diversified measurement functions can be realized; the spectrum feedback dimming colorimetric light box has the characteristics of being high in regulation and control speed, high in accuracy, wide in application scope, powerful in functions and the like, thus being widely applied to occasions such as color evaluation needing multiple light source spectrum lighting conditions.

The present invention relates to a spectrum test device used for material detection, and especially to a spectrometer based on X ray inspired light source. The spectrometer comprises an X ray generator, a vacuum channel, a limiting slit, a rotation sample table for placing the tested sample, an optical fiber, an incidence slit, a diffraction grating, an emergence slit, a concave mirror, a lens, a photomultiplier tube and a computer processing system. The X ray emitted from the X ray generator passes through a limiting slit of vacuum channel outlet and is irradiated to the tested sample on the rotation sample table. The inspired light of sample is transmitted to the incidence slit through the optical fiber, and is emitted out from the emergence slit after light splitting of diffraction grating. The inspired light is assembled to the photomultiplier tube after the concave mirror and lens. The photomultiplier tube is connected with the computer processing system through an A / D converter. The spectrometer of the invention settles a technical problem that the prior technical means can not realize the accurate and whole detection to the luminescent spectrum of luminescent material under the inspiration of X ray.

The invention discloses optical anti-forgery ink with red, green and blue long-life luminescent characteristics and a preparation method and application thereof, and relates to the optical anti-forgery ink. The optical anti-forgery ink is prepared from the following components: 1-2 parts of a high-nitrogen doped carbon dot material, 150-250 parts of urea, 50-100 parts of allophanamide, and 5,000-8,000 parts of an organic solvent. The preparation method comprises the following steps: enabling the high-nitrogen doped carbon dot material to be mixed with water solution of the urea, performing ultrasonic treatment, to obtain reacting mixed liquid, performing a drying reaction, cooling to a room temperature, and dissolving in the organic solvent with a carbon-dot-based composite material of theallophanamide, performing the ultrasonic treatment, to obtain the optical anti-forgery ink with red, green and blue long-life luminescent characteristics. The optical anti-forgery ink is sprayed on paper by using a commercial ink-jet printer, and an anti-fake mark is obtained. Based on a characteristic luminescent spectrum of the ink, long luminescent life and ink spraying, image or character information is formed.

The present invention discloses a hydrothermal synthesis method of a zinc oxide nanomaterial, and the method is as follows: under the conditions of hydrothermal synthesis, a reaction solution containing a zinc salt and an alkali is contacted with a growth substrate in a reactor to prepare a ZnO nanostructure array on the growth substrate, the reaction solution also contains an ammonium salt. The invention also provides the zinc oxide nanomaterial prepared by the method, the near band edge emission intensity and defect state emission intensity ratio in the light induced luminescence spectra of the zinc oxide nanomaterial is greater than 6, preferably greater than 10, and more preferably greater than 20. The defect density of the ZnO nanostructure synthesized by the method is significantly reduced, and the optical quality of the ZnO nanostructure array is greatly improved. In addition, the length of the ZnO nanostructure array synthesized by the method in same growth period is increased significantly, and the growth rate of the ZnO nanostructure array is greatly improved.

According to one embodiment, there is provided a white light source system. P(λ), B(λ) and V(λ) satisfy an equation (1) below in a wavelength range of 380 nm to 780 nm. The white light source system satisfies an expression (2) below in a wavelength range of 400 nm to 495 nm:∫380780⁢P⁡(λ)⁢V⁡(λ)⁢d⁢⁢λ=∫380780⁢B⁡(λ)⁢V⁡(λ)⁢d⁢⁢λ(1)P⁡(λ) / B⁡(λ)≦1.8.(2)where P(λ) is a light emission spectrum of white light, B(λ) is a light emission spectrum of blackbody radiation of a color temperature correspond to a color temperature of the white light, and V(λ) is a spectrum of a spectral luminous efficiency.

The invention discloses a quick detection method and detection device of a diamond luminescent spectrum. The method includes the following steps that the surface of a diamond sample is irradiated by lasers with the wavelength of 405 nm; after the lasers irradiate features of lattice defects on the surface of the diamond sample, a photoluminescence phenomenon is generated, and the spectrum is formed; the spectrum is received by a spectrograph through an optical fiber mechanism and transmitted to a computer display screen; peak position feature spectrum charts of the corresponding lattice defects are displayed by the computer display screen according to different features of the diamond sample; according to the peak position features of the spectrum charts, it is confirmed that diamond is natural or synthesized; when the peak positions of the spectrum position are at the 415 nm position and the 741 nm position, it can be confirmed that the diamond is natural diamond; if the peak position of the spectrum position is at the 737 nm position and no 415 nm peak position exists, it can be confirmed that the diamond is synthesized through the chemical vapor deposition method; if the peak positions of the spectrum position are on the 883 nm position and the 884 nm position, it can be confirmed that the diamond is high-temperature high-pressure synthesized diamond. The method and device have the advantages that detection is easy, operation is convenient and distinguishing is accurate.

The present invention provides a white light source satisfying a relational equation of−0.2≦[(P(λ)×V(λ)) / (P(λmax1)×V(λmax1))−(B(λ)×V(λ)) / (B(λmax2)×V(λmax2))]≦+0.2,assuming that: a light emission spectrum of the white light source is P(λ); a light emission spectrum of black-body radiation having a same color temperature as that of the white light source is B(λ); a spectrum of a spectral luminous efficiency is V(λ); a wavelength at which P(λ)×V(λ) becomes largest is λmax1; and a wavelength at which B(λ)×V(λ) becomes largest is λmax2. According to the above white light source, there can be provided a white light source capable of reproducing the same light emission spectrum as that of natural light.

The present invention provides a white light source comprising: a blue light emitting diode (blue LED) having a light emission peak wavelength in a range of 421 to 490 nm; and a phosphor layer including phosphor and resin, wherein the white light source satisfies a relational equation of −0.2≦[(P(λ)×V(λ)) / (P(λmax1)×V(λmax1))−(Bλ)×V(λ)) / (B(λmax2)×V(λmax2))]≦+0.2, assuming that: a light emission spectrum of the white light source is P(λ); a light emission spectrum of black-body radiation having a same color temperature as that of the white light source is B(λ); a spectrum of a spectral luminous efficiency is V(λ); a wavelength at which P(λ)×V(λ) becomes largest is λmax1; and a wavelength at which B(λ)×V(λ) becomes largest is λmax2, and wherein an amount of chromaticity change on CIE chromaticity diagram from a time of initial lighting up of the white light source to a time after the white light source is continuously lighted up for 6000 hours is less than 0.010. According to the above white light source, there can be provided a white light source capable of reproducing the same light emission spectrum as that of natural light.

The invention provides a 2,1,3-Benzothiadiazole-based D-A-A type near-infrared luminous compound and application thereof. The chemical structure of the 2,1,3-Benzothiadiazole-based D-A-A type near-infrared luminous compound is described in the description, wherein 2,1,3-Benzothiadiazole is taken as a main body, A is cyano, pyridine, sulfuryl or bis(2,4,6-trimethylphenyl) borane; D is diphenylamine, triphenylamine, 4,4'-dimethyl diphenylamine, 4,4'-dimethyl triphenylamine, 4,4'-dimethoxy diphenylamine or 4,4'-dimethoxy triphenylamine. The D-A-A type near-infrared luminous compound provided by the invention not only maintains the intense interaction of D-A, but also has higher fluorescence quantum yield. The luminescent spectrum and quantum yield of the luminous compound can be adjusted by adjusting the intensity of the D-A, so that the balance of the D-A is realized, and the efficiency of a near-infrared organic light emitting diode is further increased.

The invention relates to fluorescent powder using silicon-aluminum base nitrogen oxides as base materials and a preparation method thereof, which belong to the field of nitrogen oxide preparation and luminescent materials thereof. The fluorescent powder has the composition of M<6-a-c>X<2a>Al<4-b>SiNO<12-b>:cR or M<6-a-c>X<2a>Al<4-b>SiNO<12-b>:(2c / 3)R, wherein a crystalline phase represented by M<6-a-c>X<2a>Al<4-b>SiNO<12-b> is used as a major ingredient, and R is used as an optical activity element, wherein M represents any one ion or the combination of any two ions in Ca<2+>, Sr<2+>, Ba<2+> and Zn<2+>, X represents any one ion or the combination of any two ions in Li<+>, Na<+> and K<+>, R is any one ion or the combination of any two ions in Ce, Eu, Bi, Mn, Sn, Tb, Tl, Pb and Sm, a is greater than or equal to 0 and is smaller than or equal to 2, b is greater than or equal to 2 and is smaller than or equal to 3, and c is greater than or equal to 0.001 and is smaller than or equal to 0.2. The fluorescent powder of the invention has good fluorescent performance in the visible light wave band range. When being excited by ultraviolet light, the fluorescent powder has higher luminescent intensity and wider luminescent spectrum. The fluorescent powder can be used for luminescent layers of power type semiconductor illumination devices.

The invention relates to a preparation method and applications of zero-dimensional lead-free perovskite Cs3Cu2X5, and belongs to the technical field of luminescent materials and LEDs. The preparationmethod adopts a ball milling method, mainly utilizes intermolecular collision to react in a ball milling process, and has the characteristics of simplicity in operation, short reaction time, mild reaction conditions and suitability for batch production. The zero-dimensional lead-free perovskite Cs3Cu2X5 prepared by the invention has the advantages of wide luminescence spectrum, small self-absorption, low cost and the like, and has a good application prospect in fluorescent devices.

The invention relates to establishment of a series of artificial luciferases based on artificial amino acid sequences extracted by amino acid alignment of copepod-derived luciferase sequences in a database based on amino acid similarity. The invention provides high luminescence intensity, high luminescence stability, and a spectrum with increased wavelength as luminescence characteristics. A series of artificial luciferases (ALuc) was established. The group of ALucs has superior luminescence characteristics, such as an increase in luminescence intensity, an increase in luminescence stability, or an increase in wavelength of the luminescence spectrum, which were not obtained before. Further, by using the artificial luciferases (ALuc) of the invention, it is possible to provide a novel, superior bioassay system, such as a bioluminescent probe, two-hybrid assay, a luminescent capsule, or the like having improved measurement function.

An organic electroluminescent element comprising an anode, a first light-emitting layer containing at least a first host material and a first dopant, and a second light-emitting layer containing at least a second host material and a second dopant in the following order , and the cathode, characterized in that: the energy gap E of the first host material gh 1. The energy gap E of the first dopant gd 1. The energy gap E of the second host material gh 2 and the energy gap E of the second dopant gd 2 satisfy the following formula, and the luminous intensity I1 of the luminous maximum wavelength from the luminous spectrum of the first luminous layer and the luminous intensity I2 of the luminous maximum wavelength of the luminous spectrum from the second luminous layer satisfy the following formula: E gh 1>E gd 1;E gh 2>E gd 2;E gd 1>E gd 2; I1>3.5×I2.

The invention discloses a red light-fluorescent light conversion material for a plant lamp and a preparation method of the conversion material. The conversion material adopts the formula of (Y1-xAx)3(Al1-y-mCrmBy)5O12, wherein x is larger than or equal to 0 and smaller than or equal to 1; y is larger than or equal to 0 and smaller than or equal to 1; m is larger than or equal to 0 and smaller than or equal to 0.05; A is one or Lu, Tb, Pr, La, Gd and Ce; B is one or Ga, Ti, Mn and Zr. The conversion material adopts a proper blue LED chip and a light conversion material, so as to enhance the luminous intensity of the lamp in a targeted manner at the wave bands of 400 to 520 nm (blue) and 610 to 720 nm (red), and directly form a luminescent source meeting the requirement of plant growth; moreover, the luminescent spectrum can be adjusted by adjusting the performance or size proportion of the light conversion material, so as to be convenient to use and easy to operate and control.

The invention relates to a preparation method of Ag2CO3 / g-C3N4. According to the preparation method, a nitrogen-containing organic matter, a silver salt solution and a silver precipitant are used as precursors and are roasted to prepare g-C3N4; then the g-C3N4 is precipitated to prepare Ag2CO3; then an Ag2CO3 / g-C3N4 compound photocatalyst is prepared and is characterized through X-ray diffraction(XRD), infrared spectrum (IR), ultraviolet-visual diffuser reflectance (UV-Vis DRS), photoluminescence spectrum (PL) and the like. The invention further relates to application of the prepared catalyst; methyl orange is used as a model compound of photocatalytic reaction and the photocatalytic activity of the catalyst is evaluated.