Abstract: The present application discloses a first aspect provides a quantum dot light-emitting diode, including: a cathode and an anode which are oppositely arranged; a quantum dot light-emitting layer arranged between the cathode and the anode; and a stacked layer arranged between the cathode and the quantum dot light-emitting layer. A stacked layer includes: a first metal oxide nanoparticle layer, and a mixed material layer arranged on a surface of the first metal oxide nanoparticle layer far away from the quantum dot light-emitting layer. The mixed material layer includes: first metal oxide nanoparticles, and a second metal oxide dispersed among gaps of the first metal oxide nanoparticles. First metal oxide nanoparticles in the first metal oxide nanoparticle layer serve as an electron transport material. A content of the second metal oxide in the mixed material layer gradually increases in a direction from the quantum dot light-emitting layer to the cathode.

Abstract: A switched mode power supply includes a power circuit and a control circuit coupled to the power circuit for regulating its output voltage. The control circuit is configured to generate a control signal for at least one power switch of the power circuit using a reference voltage, determine if a duty cycle of the control signal is within a defined range, sense one or more output parameters of the power circuit including the output voltage of the power circuit, and in response to determining the duty cycle of the control signal is outside the defined range, adjust the reference voltage to adjust the duty cycle of the control signal. The reference voltage is adjustable over time to thereby linearly adjust the output voltage of the power circuit. Other example switched mode power supplies, control circuits, and methods for regulating output voltages of switched mode power supplies are also disclosed.

Abstract: A switched mode power supply comprises a communication interface including an address terminal configured to couple to an external resistor for setting a communication address of the switched mode power supply. A control circuit is configured to determine the value of the external resistor a first time with a first technique and set the communication address of the switched mode power supply based on the value of the external resistor determined using the first technique if the value of the external resistor is greater than the threshold value. The control circuit is also configured to, if the value of the external resistor is less than the threshold value, determine the value of the external resistor a second time with a second technique and set the communication address of the switched mode power supply based on the value of the external resistor determined using the second technique.

Abstract: A method for preparing a quantum dot film, including: in the presence of an inert gas atmosphere, providing a mixed solution system comprising first quantum dots and a fatty acid solution of first ligands, and performing ligand exchange reaction under a first heating condition, to prepare second quantum dots having the first ligands having a structure of Formula 1 attached to surfaces thereof; and depositing the second quantum dots on a substrate to prepare a quantum dot prefabricated film, depositing a mixed solution containing an initiator and a cross-linker on the quantum dot prefabricated film, and heating to crosslink the first ligands on the surfaces of the second quantum dots; or alternatively, adding an initiator and a cross-linker to the second quantum dots, and depositing a resulting mixed system onto a substrate, heating to crosslink the first ligands on the surfaces of the second quantum dots.

Abstract: A quantum dot material includes quantum dot particles and a first ligand bonded to a surface of the quantum dot particles. The first ligand is a metal-organic framework (MOF) monomer, and the MOF monomer includes at least three first active groups bonded to the quantum dot particles.

Abstract: A quantum dot film includes: one surface grafted with a first ammonium halide ligand; and another surface opposite to the one surface and grafted with a second ammonium halide ligand. The first ammonium halide ligand has a general structural formula: and the second ammonium halide ligand has a general structural formula: n1?12, n2?12, 12?n3?17, 12?n4?17, n1, n2, n3 and n4 are natural numbers, Y1 and Y2 are independently selected from phenyl or hydrogen, and X is halogen.

Abstract: The present application discloses a method for modifying zinc oxide nanoparticles, comprising following steps: obtaining zinc oxide solution and betaine ligands; mixing the zinc oxide solution and the betaine ligand, keeping a resulting mixed solution reacted under a protective gas atmosphere at a preset temperature, and separating a modified zinc oxide from the resulting mixed solution to obtain a modified zinc oxide. The method for modifying zinc oxide nanoparticles provided in the present application is simple and quick to operate, suitable for industrial production and meets application requirements. And the modified zinc oxide with betaine ligands grafted on the surface has good stability and excellent monodisperse performance, hinders the transmission rate of electrons to a certain extent and improves the recombination efficiency of electrons and holes in the quantum dot light-emitting layer.

Abstract: A composite material, a preparation method thereof, and a quantum dot light-emitting diode. The composite material includes n-type metal oxide nanoparticles and an organic molecule shown in Formula I connected to the n-type metal oxide nanoparticles, and the organic molecule is bound on the surface of the n-type metal oxide nanoparticles through carboxyl groups. In Formula I, R is a hydrocarbyl group or a hydrocarbyl derivative containing at least one conjugation effect unit. The composite material has good film-forming quality and crystalline properties, and enhances the electron mobility of the composite material through conjugation efficiency, thereby having good electron transportation capability.

Abstract: A method for preparing a composite material, including the following steps: providing metal oxide nanoparticles and a polyaromatic compound having a structure represented by Formula I, where, Ar1, Ar2, Ar3, and Ar4 are selected from aromatic rings; X1, X2, and X3 are selected from active groups configured for binding with the metal oxide nanoparticles, each of R1, R2, and R3 independently contains at least one of alkylene, amine, —N?N—, alkenyl, alkynyl, and phenyl, and each of m, n, and y is independently selected from 0 or positive integers; dispersing the polyaromatic compound and the metal oxide nanoparticles in a solvent to yield a mixed solution; and heating the mixed solution to yield the composite material. A composite material includes: a polyaromatic compound and metal oxide nanoparticles. The polyaromatic compound is connected to the metal oxide nanoparticles. The polyaromatic compound has a structure represented by Formula I.

Abstract: A switched mode power supply includes a power circuit and a control circuit coupled to the power circuit for regulating its output voltage. The control circuit is configured to generate a control signal for at least one power switch of the power circuit using a reference voltage, determine if a duty cycle of the control signal is within a defined range, sense one or more output parameters of the power circuit including the output voltage of the power circuit, and in response to determining the duty cycle of the control signal is outside the defined range, adjust the reference voltage to adjust the duty cycle of the control signal. The reference voltage is adjustable over time to thereby linearly adjust the output voltage of the power circuit. Other example switched mode power supplies, control circuits, and methods for regulating output voltages of switched mode power supplies are also disclosed.

Abstract: The present application discloses a first aspect provides a quantum dot light-emitting diode, including: a cathode and an anode which are oppositely arranged; a quantum dot light-emitting layer arranged between the cathode and the anode; and a stacked layer arranged between the cathode and the quantum dot light-emitting layer. A stacked layer includes: a first metal oxide nanoparticle layer, and a mixed material layer arranged on a surface of the first metal oxide nanoparticle layer far away from the quantum dot light-emitting layer. The mixed material layer includes: first metal oxide nanoparticles, and a second metal oxide dispersed among gaps of the first metal oxide nanoparticles. First metal oxide nanoparticles in the first metal oxide nanoparticle layer serve as an electron transport material. A content of the second metal oxide in the mixed material layer gradually increases in a direction from the quantum dot light-emitting layer to the cathode.

Abstract: A switched mode power supply includes a power circuit and a control circuit coupled to the power circuit for regulating its output voltage. The control circuit is configured to generate a control signal for at least one power switch of the power circuit using a reference voltage, determine if a duty cycle of the control signal is within a defined range, sense one or more output parameters of the power circuit including the output voltage of the power circuit, and in response to determining the duty cycle of the control signal is outside the defined range, adjust the reference voltage to adjust the duty cycle of the control signal. The reference voltage is adjustable over time to thereby linearly adjust the output voltage of the power circuit. Other example switched mode power supplies, control circuits, and methods for regulating output voltages of switched mode power supplies are also disclosed.

Abstract: A switched mode power supply includes a power circuit and a control circuit coupled to the power circuit for regulating its output voltage. The control circuit is configured to generate a control signal for at least one power switch of the power circuit using a reference voltage, determine if a duty cycle of the control signal is within a defined range, sense one or more output parameters of the power circuit including the output voltage of the power circuit, and in response to determining the duty cycle of the control signal is outside the defined range, adjust the reference voltage to adjust the duty cycle of the control signal. The reference voltage is adjustable over time to thereby linearly adjust the output voltage of the power circuit. Other example switched mode power supplies, control circuits, and methods for regulating output voltages of switched mode power supplies are also disclosed.

Abstract: A switched mode power supply comprises a communication interface including an address terminal configured to couple to an external resistor for setting a communication address of the switched mode power supply. A control circuit is configured to determine the value of the external resistor a first time with a first technique and set the communication address of the switched mode power supply based on the value of the external resistor determined using the first technique if the value of the external resistor is greater than the threshold value. The control circuit is also configured to, if the value of the external resistor is less than the threshold value, determine the value of the external resistor a second time with a second technique and set the communication address of the switched mode power supply based on the value of the external resistor determined using the second technique.

Abstract: A switched mode power supply includes a communication interface and an address terminal for setting a communication address for the power supply using the resistance of an external resistor when the external resistor is coupled to the address terminal. The power supply is configured to determine a first resistance value for the external resistor using a first technique, determine a second resistance value for the external resistor using a second technique, set the communication address of the power supply using the first resistance value if the first resistance value is greater than a threshold value, and set the communication address of the power supply using the second resistance value if the first resistance value is less than the threshold value. Other example switched mode power supplies, power systems including one or more power supplies, and methods for setting a communication address of a power supply are also disclosed.

Abstract: A switched mode power supply includes a communication interface and an address terminal for setting a communication address for the power supply using the resistance of an external resistor when the external resistor is coupled to the address terminal. The power supply is configured to determine a first resistance value for the external resistor using a first technique, determine a second resistance value for the external resistor using a second technique, set the communication address of the power supply using the first resistance value if the first resistance value is greater than a threshold value, and set the communication address of the power supply using the second resistance value if the first resistance value is less than the threshold value. Other example switched mode power supplies, power systems including one or more power supplies, and methods for setting a communication address of a power supply are also disclosed.

Abstract: A low noise amplifier and a radio frequency amplification method using the low noise amplifier are provided. The low noise amplifier includes gain stage circuits, the number of which is not less than that of RF signals to be amplified, and the gain stage circuit is configured to independently amplify the RF signal when being enabled; a plurality of amplification selection switching circuits, each of which is connected to one of the gain stage circuits and is configured to, according to the RF signal, control the gain stage circuit to be enabled or disabled; a plurality of driving circuits, each of which is connected to a respective one of the plurality of gain stage circuits and is configured to, when the gain stage circuit is enabled, receive at least one RF signal amplified by the gain stage circuit and output the amplified RF signal; and at least one load circuit.

Abstract: A low noise amplifier and a radio frequency amplification method using the low noise amplifier are provided. The low noise amplifier includes gain stage circuits, the number of which is not less than that of RF signals to be amplified, and the gain stage circuit is configured to independently amplify the RF signal when being enabled; a plurality of amplification selection switching circuits, each of which is connected to one of the gain stage circuits and is configured to, according to the RF signal, control the gain stage circuit to be enabled or disabled; a plurality of driving circuits, each of which is connected to a respective one of the plurality of gain stage circuits and is configured to, when the gain stage circuit is enabled, receive at least one RF signal amplified by the gain stage circuit and output the amplified RF signal; and at least one load circuit.

Abstract: The present invention relates to a method for preparing a sulfur-resistant catalyst for aromatics saturated hydrogenation, comprising the steps of: preparing noble metal impregnation solutions from a noble metal and deionized water or an acid solution; impregnating a carrier with the impregnation solutions sequentially from high to low concentrations by incipient impregnation; homogenizing, drying, and calcinating to obtain the sulfur-resistant catalyst for aromatics saturated hydrogenation. The catalyst for aromatics saturated hydrogenation prepared by the method according to the present invention is primarily used in processing low-sulfur and high-aromatics light distillate, middle distillate, atmospheric gas oil, and vacuum gas oil.

Abstract: Disclosed are a method for preparing a noble metal hydrogenation catalyst comprising preparing a carrier from a molecular sieve having a 10-member ring structure and/or an amorphous porous material; preparing a noble metal impregnation solution; and preparing noble metal impregnation solutions in a concentration gradient ranging from 0.05 to 5.0 wt % with deionized water, and sequentially impregnating the carrier with the impregnation solutions from low to high concentrations during the carrier impregnation process, or preparing a noble metal impregnation solution at a low concentration ranging from 0.05 to 0.5 wt % and impregnating the carrier by gradually increasing the concentration of the noble metal impregnation solution to 2.0 to 5.0 wt % in the impregnation process, followed by homogenization, drying, and calcination, as well as a noble metal hydrogenation catalyst, use thereof, and a method for preparing lubricant base oil.