Wavelength converting particle, method for manufacturing wavelength converting particle, and light-emitting diode containing wavelength converting particle

A light-emitting diode comprising:

• a base structure;
• at least one excitation light source disposed on the base structure and configured to emit light of a predetermined wavelength;
• and
• a wavelength-converting layer disposed along an optical path of the excitation light source and including a plurality of wavelength-converting particles which comprise:
• one or more nanocrystals of a perovskite material configured to absorb light having a first wavelength and to emit light having a second wavelength;
• wherein the second wavelength of the light emitted from the perovskite material does not change substantially over the nanocrystal size thereof unlike a quantum dot that substantially changes a wavelength of light emitted therefrom over a nanocrystal size thereof;
• a plurality of ligands attached to the one or more nanocrystals;
• a dispersion medium configured to disperse the wavelength-converting particles;
• and
• a sealing member that seals the wavelength-converting particles and the dispersion medium,
• wherein the wavelength-converting particles are dispersed in the dispersion medium, and
• wherein the plurality of ligands are configured to make the one or more nanocrystals more dispersible than without such ligands in a medium.