Wavelength converting particle, method for manufacturing wavelength converting particle, and light-emitting diode containing wavelength converting particle
Provided are a wavelength converting particle, a method for manufacturing a wavelength converting particle, and a light-emitting diode containing a wavelength converting particle. The wavelength converting particle comprises a hybrid OIP nanocrystal that converts a wavelength of light generated by an excitation light source into a specified wavelength. Accordingly, it is possible to optically stabilize and improve color purity and light-emission performance without changes in a light-emitting wavelength range.
1 . A light-emitting device 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.
2 . The light-emitting device of claim 1 , wherein the base structure is a light-emitting diode wafer.
3 . The light-emitting device of claim 1 , wherein the base structure is a sub-mount substrate.
4 . The light-emitting device of claim 1 , wherein the perovskite material has a crystal structure of A 2 BX 4 , ABX 4 , ABX 3 , or A n−1 B n X 3n+1 (n is an integer ranging from 2 to 6); and
A is organic ammonium or organic cation, B is a metal, and X is a halogen.
5 . The light-emitting device of claim 4 , wherein A is (CH 3 NH 3 ) n , (C x H 2x+1 ) n NH 2 )(CH 3 NH 3 ) n , (RNH 3 ) 2 , (C n H 2n+1 NH 3 ) 2 , (CF 3 NH 3 ), (CF 3 NH 3 ) n , (C x F 2x+1 ) n NH 2 )(CF 3 NH 3 ) n , (C x F 2x+1 ) n NH 3 ) 2 , or (C n F 2n+1 NH 3 ) 2 , wherein “n” is an integer greater than or equal to 1 and “x” is an integer greater than or equal to 1;
wherein B is a divalent transition metal, a rare earth metal, an alkaline earth metal, Pb, Sn, Ge, Ga, In, Al, Sb, Bi, Po, or a combination thereof;
“R” is an Alkyl; and
X is CI, Br, I, or a combination thereof.
6 . The light-emitting device of claim 1 , wherein the at least one excitation light source is at least one selected from the group consisting of a light-emitting diode (LED) and a laser diode, and
wherein the at least one excitation light source emits blue light of a wavelength ranging from 420 nm to 480 nm.
7 . The light-emitting device of claim 1 ,
wherein the plurality of ligands are configured to make the one or more nanocrystals more dispersible than without such ligands in a medium.
8 . The light-emitting device of claim 1 ,
wherein the one or more nanocrystals of a perovskite material have a nanocrystal size greater than 10 nm and smaller than 300 nm.
9 . 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.