477results about How to "Long luminous life" patented technology

Disclosed herein is a red phosphorescent compound represented by Formula 1 below:

Further disclosed herein is an organic electroluminescent (EL) device using the red phosphorescent compound.

Disclosed herein is a red phosphorescent compound represented by Formula 1 below:

wherein

is

R1 is selected from the group consisting of C₁-C₄ alkyl and C₁-C₄ alkoxy; R2, R3, R4 and R5 are independently selected from the group consisting of

hydrogen, C₁-C₄ alkyl and C₁-C₄ alkoxy; and

is selected from the group consisting of 2,4-pentanedione, 2,2,6,6,-tetramethylheptane-3,5-dione, 1,3-propanedione, 1,3-butanedione, 3,5-heptanedione, 1,1,1-trifluoro-2,4-pentanedione, 1,1,1,5,5,5-hexafluoro-2,4-pentanedione and 2,2-dimethyl-3,5-hexanedione.

Further disclosed herein is an organic electroluminescent (EL) device using the red phosphorescent compound.

Provided is an organic EL element, which has a controlled emission wavelength, a high emission efficiency and a long emission life. An organic EL element material for such organic EL element, a lighting device, and a display device using such organic EL element are also provided.

An organic electroluminescence device of the present invention comprises a light emitting layer held between electrodes, the light emitting layer containing at least a host material and a dye or pigment. The light emitting layer further comprises an additive exhibiting an absorption edge of which energy level is higher than that of an absorption edge of the dye or pigment, but the difference of the energy levels being less than 120 kJ/mol, having no lone pair, and including at least two aromatic rings. The additive of the present invention is selected from a group consisting of phenyl-substituted anthracenes, naphthyl-substituted anthracenes, naphthyl-substituted naphthalenes, pyrenes, and a naphthacene derivatives.

A pyrromethene-boron complex compound represented by the following formula (1);

wherein Z¹ and Z² are independently a hydrogen atom, a substituted or unsubstituted aryl group, a substituted or unsubstituted alkoxy group or a substituted or unsubstituted aryloxy group, at least one of Z¹ and Z² is an alkoxy group substituted with a fluorine atom or an aryloxy group substituted with a fluorine atom or a fluoroalkyl group, and Z¹ and Z² may form a ring.

An organic electroluminescent element including at least an emission layer sandwiched between an anode and a cathode, wherein the emission layer comprises at least a compound represented by Formula (A),

The application provides a quantum dot electroluminescent device, and a display device and a light device with a quantum dot electroluminescent device. The quantum dot electroluminescent device comprises an anode, a quantum dot layer, an electron barrier layer, and a cathode. The quantum dot layer is arranged on the surface of the anode. The electron barrier layer is arranged on the surface, away from the anode, of the quantum dot layer. Materials forming the electron barrier layer include hole transmission materials and/or hole injection materials. The cathode is arranged on the surface, away from the quantum dot layer, of the electron barrier layer. Electrons and the cavity injection quantum dot layer are basically consistent in rate, so that the electrons are close to holes or injection balance is realized during running of the quantum dot electroluminescent device. In this way, quantum dots are electrically neutral, non-radiative recombination, quantum dot charging and the like due to excess electrons in the quantum dots are prevented, and the light-emitting efficiency and the service life of the device are improved.

An oxygen absorbent molding or a gas absorbent molding is provided. The oxygen absorbent molding is made of oxygen absorbent powder and a binder, and is characterized in that the binder is a fibrous resin. Fluororesin can be used as the fibrous resin. This oxygen absorbent molding has excellent oxygen-absorbing capability and mechanical strength and is suited for extending the life of an organic electroluminescent element.

The invention discloses a quantum dot sealing method, a quantum dot compound particle and applications. According to the method, quantum dots are made into quantum dot compound particles, then a blocking layer is arranged on the surface of each quantum dot compound particle so as to seal the quantum dots; after sealing, the interaction among quantum dots is reduced, thus the possibility of agglomeration is reduced; moreover, the air and water are obstructed; at the same time, the possibility that quantum dots are disturbed and destroyed by contacting the external environment, when the quantum dots are further dispersed into other materials or cured or during the device preparation process is reduced; the luminous efficiency of quantum dot is improved effectively, the service life of quantum dot is prolonged; and the provided quantum dot compound particle can be applied to optical devices such as light conversion material of liquid crystal display and has the advantages of high luminous efficiency of quantum dots and long service life.

An image display apparatus includes a light source unit including light emitting elements halving different wavelengths, wherein n (n is an integer higher that 2) light emitting elements have at least one wavelength; and a light-up controller which drives the light emitting elements having different wavelengths in a time-sequential manner within a time period, wherein the light-up controller divides the n light emitting elements having at least one wavelength into m (m is an integer satisfying 2≦m≦n) light-up groups having a same light-up timing, and the m light-up groups are alternately lighted at a frequency of 1/m within the time period, so that any one of the m light-up groups can be lighted within the time period.

The present invention discloses a quantum dot luminescent layer and device, and preparation methods thereof, a luminescence module and a display device. The preparation method of the quantum dot luminescent layer comprises the steps: the quantum dots having the surfaces coated with ligand are dissolved in solvent to obtain the quantum dot solution; the quantum dot solution is deposited on the substrate or a function layer by employing the solution method to obtain a quantum dot luminescent layer; the quantum dot luminescent layer is arranged in a vacuum cavity, and organic metal compounds are pumped in to process for 0.5-30 mins, wherein the pressure in the cavity is 0.01-1mbar, the partial pressure of the organic metal compounds after gasification is 0.001-0.1mbar, the temperature in the cavity is 10-25 DEG C; and the quantum dot luminescent layer is taken out to obtain the quantum dot crosslinking luminescent layer. The quantum dot film is not only uniform flat and has a stable film, so that the quantum dot film is difficult to be redissolved to take away or wash away by the solvent when the subsequent other function layers are deposited so as to effectively improve the luminescence uniformity and the stability of the QLED.

An aromatic amine derivative represented by the following formula (1):

wherein at least one of R₁ to R₈ is a group other than a hydrogen atom, Ar₁ to Ar₄ are a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms.

A method of manufacturing an organic EL display unit and an organic EL display unit capable of improving light emitting efficiency and life of blue are provided. A hole injection layer are formed on a lower electrode. For a red organic EL device and a green organic EL device, a hole transport layer, a red light emitting layer, and a green light emitting layer made of a polymer material are formed. A hole transport layer made of a low molecular material is formed on the hole injection layer of a blue organic EL device. A blue light emitting layer made of a low molecular material is formed on the red light emitting layer, the green light emitting layer, and the hole transport layer for the blue organic EL device. An electron transport layer, an electron injection layer, and an upper electrode are sequentially formed on the blue light emitting layer.

An organic electroluminescent device comprising an anode, a cathode, a light emitting layer that is disposed between the anode and the cathode and contains a first light emitting layer material containing a phosphorescent compound and a second light emitting layer material containing a charge transporting polymer compound (that is, a light emitting layer containing a first light emitting layer material and a second light emitting layer material), and a hole transporting layer that is disposed between the anode and the light emitting layer so as to be adjacent to the light emitting layer and is composed of a hole transporting polymer compound, wherein the lowest excitation triplet energy T1_e (eV) of the first light emitting layer material, the lowest excitation triplet energy T1_h (eV) of the second light emitting layer material and the lowest excitation triplet energy T1_t (eV) of the hole transporting polymer compound satisfy the following formulae (A) and (B):

T1_e≦T1_h  (A)

T1_t−T1_e≦0.10  (B).

An organic electroluminescent device comprising an anode and a cathode, and a hole transporting layer and a light emitting layer disposed between the anode and the cathode, wherein the hole transporting layer contains 1) a mixture of 2,2′-bipyridine and/or 2,2′-bipyridine derivative and a non-2,2′-bipyridinediyl group-containing hole transporting polymer compound, 2) a 2,2′-bipyridinediyl group-containing polymer compound having a constitutional unit composed of an unsubstituted or substituted 2,2′-bipyridinediyl group, and at least one constitutional unit selected from the group consisting of constitutional units composed of a divalent aromatic amine residue and constitutional units composed of an unsubstituted or substituted arylene group, or a combination thereof.

The invention relates to a method for preparing a perovskite LED device based on surface ligand control, including the following steps: applying an organic solution of a hole injection layer materialto the surface of a conductive substrate, and forming a hole injection layer after annealing; dissolving cesium bromide, lead bromide and phenethylamine bromide in an organic solvent under the effectof a 3-(decyl dimethyl ammonium) propane-1-sulfonic acid inner salt surfactant to obtain a perovskite precursor solution, applying the perovskite precursor solution to the surface of the hole injection layer and obtaining a perovskite film after annealing; treating the surface of the perovskite film with an alkylamine organic solution to form a light-emitting layer; and successively preparing an electron transport layer, an electron injection layer and a metal cathode electrode on the surface of the light-emitting layer. The method of the invention is simple and convenient, has a wide range ofmaterials and good repeatability, and can achieve the device performance. Through surface ligand exchange, the flatness and uniformity of the perovskite film are improved, the formation of defects iseffectively suppressed, and the overall performance of the device is significantly improved.

The invention relates to a benzanthracene organic electroluminescent material, and a preparation method and application thereof. The invention solves the technical problems that the anthracene luminescent material in the prior art can not satisfy the operating requirement for OLEDs (organic light-emitting diodes). The benzanthracene organic electroluminescent material provided by the invention is prepared by reacting R1/R2-substituted amine compound and benzanthracene bromine substitute. Due to the introduction of methyl group in the 10 site, the material has the advantages of higher solubility and favorable film-forming properties. The preparation method provided by the invention has the advantages of simple synthesis and purification processes and low cost, and can satisfy the demands of industrialized development. Compared with the device prepared by using arylamino-substituted anthracene as the luminescent layer, the device prepared from the material provided by the invention has obviously higher luminescence efficiency and longer half-time service life; the luminescence efficiency is 25 Lm/w, and the half-time service life is 20000 hours; and thus, the material can satisfy the operating requirements for OLEDs.

This invention relates to a current control device of a simplified LED module including: a current control circuit, a first transistor and a current limiting protection circuit, in which, the current control circuit includes a first resistor generating a first current signal to regulate the radiation power of at least one LED, the first transistor controls the operation of the LED with the help of the first current signal and generates a second current signal, and a second transistor in the current-limiting protection circuit can decide open or close of channels based on the second current signal and the second resistor to further control said first current signal, in this way, the module can control the radiation power by the current control circuit and protect it with the help of current limit of the protection circuit.

The invention provides a compound and an organic electroluminescent device using the compound. The compound is expressed by a general formula (I) shown in the description, wherein X is O, S or Se; Ar1and Ar2 are respectively and independently selected from C6-C30 aryls, C3-C30 heteroaryls and A, and at least one of the Ar1 and the Ar2 is a heteroaryl; L1 and L2 are respectively and independentlyselected from a single bond, C6-C30 arylidenes and C3-C30 sub-heteroaryls; R1 and R2 are respectively and independently selected from hydrogen, C1-C12 alkyls or naphthenic bases, the C6-C30 aryls andthe C3-C30 heteroaryls, and the adjacent R1 and R2 can be connected into a ring; p and q are respectively 1-4 integers; m and n are respectively 0-4 integers; Ar3 and Ar4 are respectively and independently selected from the C6-C30 aryls and the C3-C30 heteroaryls; and when above various groups have substituent groups, the substituent groups are the aryls or the heteroaryls.

The invention provides a 6-mesitylene-6H-6-boron hetero benzo[cd]pyrene derivative containing substituted or non-substituted carbazolyl. Due to the bipolar transmission characteristic, the derivative can effectively balance transmission of carriers and improve transmission efficiency, by using the derivative in phosphorescent organic light-emitting devices as a main material. The invention also provides an organic electroluminescent device that has increased current efficiency, reduced turn-on voltage and good stability, and solves the problems of low transmission efficiency or poor stability of phosphorescent organic light-emitting main materials in the prior art.

In a phosphor thin film comprising a matrix material and a luminescence center, the matrix material has the compositional formula: MIIvAxByOzSw wherein MII is Zn, Cd or Hg, A is Mg, Ca, Sr, Ba or rare earth element, B is Al, Ga or In, and atomic ratios v, x, y, z and w are 0.005<=v<=5, 1<=x<=5, 1<=y<=15, 0<z<=30, and 0<w<=30. The phosphor thin film of quality is formed at low cost by a low-temperature process, enabling manufacture of full-color EL panels.