Light-emitting chip and preparation method thereof, light-emitting substrate, display device

A light-emitting chip, comprising:

• a silicon-based substrate comprising a plurality of sub-pixel openings;
• a plurality of light-emitting devices arranged on one side of the silicon-based substrate;
• wherein the light-emitting devices are in one-to-one correspondence to the sub-pixel openings, and orthographic projections of the light-emitting devices on the silicon-based substrate overlap with the sub-pixel openings;
• and
• a plurality of photoluminescent color films located in at least part of the sub-pixel openings;
• wherein the light-emitting devices are micro-sized inorganic light-emitting diodes;
• the light-emitting device comprises:
• N-type gallium nitride, a multi-quantum well layer and P-type gallium nitride stacked on one side of the silicon-based substrate;
• and the N-type gallium nitride of the plurality of light-emitting devices is integrally connected.