1. A process for preparing LED comprising the following steps: Cu NCs fluorescent nanoflowers are grounded evenly, and mixed with phosphor of different colors, then deposited on a LED chip by gluing and curing that yields various light-emitting color LEDs; wherein the Cu NCs fluorescent nanoflowers comprise flakes with a chemical composition of Cu4I4, which is quad-core Cu NCs with Cu as nucleus and triphenylphosphine as a ligand; each of the Cu NCs fluorescent nanoflowers has a diameter of 30-50 μm, each of the flakes has a length of 15-20 μm and a width of 5-8 μm.
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