Research on the application of white light LED driving based on electric field induced power amplifier

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Research on the application of white light LED driving based on electric field induced power amplifier [Copy link]

Experimental name: Preparation and application of white light LED structured coating based on electric field induction

Research direction: Experimental research on the preparation process of electric field induced structure

Experimental content:

This paper mainly focuses on the experimental research of two electric field induction processes: planar electrode and structured electrode. In the planar electrode electric field induction process, the influence of parameters such as voltage, electrode spacing, polymer film thickness on the two-dimensional distribution of the formed morphology is explored. With the purpose of enhancing the optical scattering performance, the preparation method of disordered microlenses and the preparation method of rough multi-level structures are developed based on basic process research to make the surface morphology of the structure more variable, and different process parameters are selected to study their influence on the final formed morphology of the polymer, so as to achieve effective regulation of the formed structure. In the structured electrode induction, the formation law of the polymer in the structured electric field and the influence of process parameters such as electrode voltage, initial polymer film thickness, and electrode spacing on the morphology of the formed structure are explored.

Test equipment: signal generator, power amplifier , spin coater, UV curing lamp, ultra-deep well microscope, 3D optical profiler, scanning electron microscope

Experimental process:

The planar electrode electric field induction process uses parallel flat electrodes as electric field excitation devices to amplify slight thermal disturbances on the polymer surface through a uniform electric field. In the competition of interface perturbation growth, a specific wavelength of thermal disturbance will have the fastest growth rate and eventually dominate, and a relatively disordered micro-nano column structure will grow with this wavelength as the period.

The signal generator can excite square wave, sawtooth, sine and other electrical signal functions, with a maximum loading voltage amplitude of 5V. It is amplified by a power amplifier with an amplification factor range of 1-100 times and a maximum output voltage of 1600Vpp. It is combined with the power amplifier as the electric field excitation power supply for the experiment.

In the research experiment on electrode voltage parameters, the induction process applied electrode voltages of 200V, 300V, 400V, and 500V to induce the structure. The induction process was completed within 30s. As the voltage increased, the structure grew faster.

Experimental results:

During the electric field induction process of the planar electrode, the column structure first begins to grow in the four corners of the induction area, then extends from the four sides and distributes around the frame, and finally wraps from the outside to the inside toward the center area. The size of the electrode voltage has a greater impact on the structure diameter and density under low voltage conditions. The larger the voltage, the smaller the structure diameter and the greater the structure density. The impact is minimal under high voltage conditions.

Bar graph of average diameter and relative density of formed junctions at different voltages

In the electric field-assisted microlens array forming process, different voltage waveforms have different effects on polymer rheology, which is mainly reflected in the different morphology control limits. Among them, square wave voltage with appropriate frequency has better morphology control ability than constant voltage at the same amplitude.

Too high or too low a square wave voltage frequency will weaken the effect of the voltage amplitude on the profile control. Under a 5Hz square wave voltage, the surface curvature and aspect ratio of the lens structure gradually increase with the increase of the amplitude. When the amplitude is slightly above 180V, the aspect ratio of the lens surface reaches 0.693, which verifies the good morphology control ability of the process.

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