225 results about "Electroluminescence spectra" patented technology

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 (mumax=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.

The invention discloses an organic electroluminescent device, which comprises a light emitting layer. The host material of the light emitting layer is a thermal active delay fluorescent material; the guest material is a thermal active delay fluorescent material; the band gap of the host material is larger than that of the guest material; and after the photoluminescence spectrum of the host material and the light-induced absorption spectrum of the guest material are normalized, the wavelength difference corresponding to peak values is within 50 nm.

The invention discloses an aza-phenanthro-fluorene derivative and a preparation method thereof as well as an electrically-induced fluorescence luminescent device. The structural general formula of the aza-phenanthro-fluorene derivative is as shown in the specification, wherein Ar1 and Ar2 in the structural general formula are carbazole groups. The aza-phenanthro-fluorene derivative disclosed by the invention has the advantages that the aza-phenanthro-fluorene derivative has a relatively good non-planar rigid structure, due to the introduction of heteroatom, the electron transfer rate of the fluorene compound is increased, the device efficiency is improved, meanwhile the fluorene compound is connected to other carbazole groups with high fluorescence quantum efficiency and hole transfer rate through 9-site of the aza-phenanthro-fluorene, the molecular rigidity of the whole compound can be enhanced very well, the glass transition temperature of the compound is increased, the luminescent layer hole and the electron transfer rate of the device are promoted, the exciton recombination probability is increased, the stability of the luminescent device is further improved, meanwhile the pi-pi stacking between molecules of the compound is inhibited, the red shift degree of electroluminescent spectra is reduced, and the efficiency of the fluorescence luminescent device is improved.

The invention discloses a bipolar-configuration pyrenyl blue-light emitting material containing a benzimidazole unit, a preparation method and an application, and belongs to the field of organic electroluminescent materials and devices. The efficient pyrenyl blue-light emitting material is synthesized by introducing phenyl, alkyl phenyl or alkoxy phenyl groups to 1-position and 8-position of pyrene and introducing N-phenylbenzimidazole groups to 3-position and 6-position of pyrene. The pyrenyl blue-light emitting material has the advantages of simple and convenient synthesis, cheap raw materials and low cost; peripheral substituent groups can effectively inhibit intermolecular accumulation, and the solid-state luminous efficiency of the material can be as high as 85.43%. The heat stability of the material is high, and the material has higher decomposition temperature and glass-transition temperature; the material has excellent electron transport capacity, so that a device structure can be simplified. An electroluminescent device prepared from the pyrenyl blue-light emitting material as a luminescent layer as well as an electron transport layer has higher level in the aspects of luminance, efficiency, stability and the like, the electroluminescence spectrum of the material is in an area from sky blue to dark blue, and one excellent blue-light emitting material is provided for full-color display and lighting.

An organic light-emitting display (OLED) device is disclosed that includes: a red organic light-emitting diode comprising a red organic emission layer; a green organic light-emitting diode comprising a green organic emission layer; and a blue organic light-emitting diode comprising a blue organic emission layer. The difference between a peak of a photoluminescence spectrum of the red organic emission layer and a peak of an electroluminescence spectrum of the red organic light-emitting diode is less than 2 nm, the difference between a peak of a PL spectrum of the green organic emission layer and a peak of an EL spectrum of the green organic light-emitting diode is less than 2 nm, and the difference between a peak of a PL spectrum of the blue organic emission layer and a peak of an EL spectrum of the blue organic light-emitting diode is 4 nm or greater.

The light extraction efficiency of a typical light-emitting diode (LED) is improved by incorporating one-dimensional ZnO nanorods. The light extraction efficiency is improved about 31% due to the waveguide effect of ZnO sub-microrods, compared to an LED without the nanorods. Other shapes of ZnO microrods and nanorods are produced using a simple non-catalytic wet chemical growth method at a low temperature on an indium-tin-oxide (ITO) top contact layer with no seed layer. The crystal morphology of a needle-like or flat top hexagonal structure and the density and size of ZnO microrods and nanorods are easily modified by controlling the pH value and growth time. The waveguide phenomenon in each ZnO rod is observed using confocal scanning electroluminescence microscopy (CSEM) and micro-electroluminescence spectra (MES).

The invention relates to high molecular lightening material of a three-color white light and its preparing method. Based on the physical idea of 'synthesizing blue, green and red lights into white light', the green light sending unit and red light sending unit are polymerized into the blue light sending high molecular, realizing the dispersion of nucleus level of the green light and red light sending units in blue light sending high molecular, as well as movement of partial energy from the blue light sending unit to the green light and red light sending unit, by adjusting the content of green light and red light sending units to prevent the energy movement from green light sending to red light sending, resulting in realizing the synchronistically lightening of blue light, red light and green light sending unit, make the spectrum of electroluminescence cover the range of all visible light. By adjusting the relative strengths of blue light green light and red light, the while light sending of high molecular can be realized, forming a high molecular lightening material three-color white light.

An organic light-emitting element includes a first electrode, a second electrode, and at least one organic compound layer disposed between the first electrode and the second electrode. The organic compound layer includes a light-emitting layer containing a light-emitting material and being configured to emit light toward the first electrode and the second electrode. The light emitted toward the first electrode is reflected from a reflection plane located at the first electrode to cause interference with the light emitted toward the second electrode. The interference provides an interference intensity distribution having a maximum peak at a wavelength λ1. The light-emitting material of the light-emitting layer exhibits a photoluminescence spectrum having a maximum peak at a wavelength λ2. The organic light-emitting element produces an electroluminescence spectrum having a maximum peak at a wavelength λ3. These wavelengths satisfy the relationships: λ2≠λ3 and |λ2−λ3|<|λ2−λ1|.

The invention relates to a red-light niobium zincate luminescent material. A chemical formula of the red-light niobium zincate luminescent material is Me(3-x)ZnNb2O9:xPr<3+>, wherein x is 0.01 to 0.08, Me is at least one selected from calcium, strontium and barium, and Pr<3+> is an activating element. In an electroluminescent (EL) spectrum of a luminescent thin film made from the red-light niobium zincate luminescent material, luminescent peaks in the wavelength region of 611nm are very strong, so that the red-light niobium zincate luminescent material can be applied to a thin-film electroluminescent display. The invention further provides a preparation method for the red-light niobium zincate luminescent material and an application of the red-light niobium zincate luminescent material.

A cerium terbium double-doped nitrogen silicon lanthanum luminescent material has a chemical formula of La2Si6N10:xCe<3+>, yTb<3+>, wherein La2Si6N10 is a matrix, Ce<3+> and Tb<3+> are active elements, x is 0.01-0.05 and y is 0.01-0.06. In the electroluminescent spectra (EL) of a light-emitting film prepared by the cerium terbium double-doped nitrogen silicon lanthanum luminescent material, 490nm and 580nm wavelength regions both have strong light-emitting peaks, so that the light-emitting film can be used in a thin film electroluminescent display. The invention also provides a preparation method and application of the cerium terbium double-doped nitrogen silicon lanthanum luminescent material.

The invention provides a samarium-doped alkaline-earth niobium zincate luminescent material of which the chemical formula is Me[3-x]ZnNb2O9:xSm<3+>,Me[3-x]ZnNb2O9, wherein Me[3-x]ZnNb2O9 is the matrix, Sm<3+> is an active element, x is 0.01-0.05, and Me is one of calcium, strontium and barium. The light-emitting film prepared from the samarium-doped alkaline-earth niobium zincate luminescent material has strong light-emitting peaks at the wavelength of 638nm and 727nm in the electroluminescent spectrum (EL), and thus, is applicable to film electroluminescent display devices. The invention also provides a preparation method and application of the samarium-doped alkaline-earth niobium zincate luminescent material.

The invention relates to a cerium-doped alkaline earth gallate luminescent material. The cerium-doped alkaline earth gallate luminescent material has the chemical formula represented by MeGa2O4:xCe<3+>, wherein x is 0.01-0.05 and Me is zinc ion, magnesium ion, calcium ion, strontium ion or barium ion. In electroluminescent spectra (EL) of a luminescent film prepared from the cerium-doped alkaline earth gallate luminescent material, a strong luminescent peak is present at 610nm wavelength region and can be applied in thin film electroluminescent displays. The invention also provides a preparation method and an application of the cerium-doped alkaline earth gallate luminescent material.

The invention discloses carbazole group-containing azafluorene orange-light ionic-type iridium (III) complexes including hexafluorophosphoric acid-[di(2-phenylpyridine)]-[9,9-di(9-ethyl carbazole-3-yl)-4,5-diazafluorene] iridium (III) (Ir1), hexafluorophosphoric acid-[di(2-phenylpyridine)]-[9,9-di(9-ethyl hexyl carbazole-3-yl)-4,5-diazafluorene] iridium (III) (Ir2), and hexafluorophosphoric acid-[di(2-phenylpyridine)]-[9,9-di(9-phenylcarbazole-3-yl)-4,5-diazafluorene] iridium (III) (Ir3). When doping concentration of the complex Ir1 is 10%, maximum illumination brightness 907cd / m2 and current efficiency 8.35cd / A are achieved, the maximum peak of an electroluminescence spectrum is observed at 568nm, color coordinates (CIE) x=0.45, and y=0.53, orange light is emitted, and relatively weak efficiency roll off of parts is observed. Electroluminescence devices made from the complex Ir2 and Ir3 possess similar performance.