181 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 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 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 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.

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.