Substrate for LED (Light Emitting Diode) chip and preparation method thereof

The present invention discloses a method for preparing the substrate and the LED chip, the LED chip used includes a substrate main body, is provided with a plurality of partitions on the body; on each of the partitions has a reflector for controlling the three-dimensional optical phase distribution stepped structure, the three-dimensional structure having a step ladder several different depths. While the present invention provides a method for preparing the substrate, comprising: providing a blanket substrate; in the partition unit, designed with a microstructure control simulation phase distribution of the reflected light; the microstructure into simulated three-dimensional simulation step structure; simulation of the designed three-dimensional step structure prepared to each partition of the unpatterned substrate, forming a substrate for the LED chip. Preparing a substrate for an LED chip of the present invention solves the problem of the conventional substrate can not control the phase distribution of the reflected light to improve the light amount of the LED chip, to improve the brightness of the LED chip.