3results about How to "Increase the starting voltage" patented technology

This invention discloses an organic electroluminescent device and display device. The organic electroluminescent device includes an anode, a cathode, and at least one light-emitting layer formed between the anode and the cathode. A hole injection layer and a hole transport region are provided between the anode and the light-emitting layer closest to the anode. The hole transport region includes a first hole transport layer and a second hole transport layer with different refractive indices. The first hole transport layer is selected from compounds of Formula 1 or Formula 3, and the second hole transport layer is selected from compounds of Formula 2. This invention's organic electroluminescent device, through improvements in film structure and material matching, ensures both material stability and carrier transport, while simultaneously improving the light field distribution through optimized optical microcavity structure, thus achieving performance enhancement. [Formula 1] [Formula 2] [Formula 3]

The present invention provides a phosphorescent host material and a preparation method thereof and an organic electroluminescent device. The present invention belongs to the technical field of organic electroluminescent materials. The light-emitting device containing the phosphorescent host material of the present invention exhibits the characteristics of low driving voltage, high luminous efficiency and long life, and the comprehensive performance of the device is more excellent.

The present invention belongs to the technical field of voltage transformers, and particularly relates to a method for manufacturing a voltage transformer. The method comprises the following steps: step S1: manufacturing a mold; step S2: manufacturing a voltage transformer coil body; step S3: vacuum drying the voltage transformer coil body and preheating it, and then heating the mold with the voltage transformer coil body to a constant temperature after molding; step S4: evacuating the inner cavity of the mold and filling it with SF6 gas, and then depressurizing it to normal pressure, so that the inner cavity of the mold is completely in an insulating gas environment; step S5: injecting epoxy resin mixture into the inner cavity of the mold under pressure; step S6: curing the heat-insulating gel; step S7: demoulding, and then curing; step S8: assembling. The present invention has a simple process, convenient operation, short gel curing time, shortened production cycle, small mixture viscosity, stable gel time and glass transition temperature, high mechanical and electrical strength of the product, and small partial discharge.