Organic-inorganic hybrid perovskite nanocrystal particle light emitting body having two-dimensional structure, method for producing same, and light emitting device using same
Provided are an organic-inorganic-hybrid perovskite nanocrystal particle light-emitter having a two-dimensional structure, a method for producing the same, and a light emitting device using the same. The organic-inorganic-hybrid perovskite nanocrystal particle light-emitter having a two-dimensional structure comprises an organic-inorganic-hybrid perovskite nanocrystal structure having a two-dimensional structure which can be dispersed in an organic solvent. Accordingly, the nanocrystal particle light-emitter comprises an organic-inorganic-hybrid perovskite nanocrystal having a crystal structure combining FCC and BCC; forms a lamellar structure where organic planes and inorganic planes are accumulated in an alternating manner; and can exhibit high color purity by confining excitons in the inorganic planes. In addition, since the exciton diffusion distance decreases and exciton binding energy increases, it is possible to prevent exciton annihilation caused by thermal ionization and delocalization of charge carriers, such that the nanocrystal particle light-emitter can have high luminescence efficiency at room temperature.
1. An organic-inorganic-hybrid perovskite nanocrystal particle light-emitter, which has a two dimensional (2D) structure, comprising an organic-inorganic-hybrid perovskite nanocrystal structure, is capable of being dispersible in an organic solvent and has a 2D structure.
2. The organic-inorganic-hybrid perovskite nanocrystal particle light-emitter of claim 1 , wherein the organic solvent comprises a polar solvent and a non-polar solvent,
the polar solvent comprises dimethylformamide, gamma butyrolactone, N-methylpyrrolidone, dimethylsulfoxide or isopropyl alcohol, and
the non-polar solvent comprises dichloroethylene, trichlorethylene, chloroform, chlorobenzene, dichlorobenzene, styrene, xylene, toluene, or cyclohexene.
3. The organic-inorganic-hybrid perovskite nanocrystal particle light-emitter of claim 1 , wherein the 2D structure is an organic-inorganic-hybrid perovskite nanocrystal structure with a center metal centered in a face centered cubic, in which six inorganic halide materials X are respectively located on all surfaces of a hexahedron, and in a body centered cubic, in which eight organic ammonium or inorganic cation are respectively located at all vertexes of a hexahedron and is defined as a structure of which a horizontal length and a vertical length are the same, but a height length is longer by 1.5 times or more than each of the horizontal length and the vertical length.
4. The organic-inorganic-hybrid perovskite nanocrystal particle light-emitter of claim 1 , wherein the nanocrystal particle has a spherical, cylindrical, cylindroid, polyprism or 2D shape.
5. The organic-inorganic-hybrid perovskite nanocrystal particle light-emitter of claim 1 , wherein the nanocrystal particle has a size of 1 nm to 900 nm.
6. The organic-inorganic-hybrid perovskite nanocrystal particle light-emitter of claim 1 , wherein the nanocrystal particle light-emitter has an emission wavelength of 200 nm to 1300 nm.
7. The organic-inorganic-hybrid perovskite nanocrystal particle light-emitter of claim 1 , wherein the organic-inorganic-hybrid perovskite nanocrystal particle has bandgap energy determined by the crystal structure without depending on the particle size.
8. The organic-inorganic-hybrid perovskite nanocrystal particle light-emitter of claim 1 , wherein the nanocrystal particle has bandgap energy of 1 eV to 5 eV.
9. The organic-inorganic-hybrid perovskite nanocrystal particle light-emitter of claim 1 , wherein the organic-inorganic-hybrid perovskite has a structure of A 2 BX 4 , ABX 4 , or A n−1 BnX 3n+1 (where n is an integer between 2 to 6), and
the A is organic ammonium or inorganic cation, the B is a metal material, the X is a halogen element.
10. The organic-inorganic-hybrid perovskite nanocrystal particle light-emitter of claim 9 , wherein the A is (CH 3 NH 3 ) n , ((C x H 2x+1 ) n NH 3 ) 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 3 ) 2 (CF 3 NH 3 ) n , ((C x F 2x+1 ) n NH 3 ) 2 ), (CH(NH 2 ) 2 ), C x H 2x+1 (C(NH 2 ) 2 ), Cs, Rb, K, (C n F 2n+1 NH 3 ) 2 or a combination thereof (where n is an integer equal to or greater than 1, and x is an integer equal to or greater than 1),
the B is a divalent transition metal, a rare earth metal, an alkali earth metal, Pb, Sn, Ge, Ga, In, Al, Sb, Bi, Po, or a combination thereof, and
the X is Cl, Br, I, or a combination thereof.
11. The organic-inorganic-hybrid perovskite nanocrystal particle light-emitter of claim 1 , further comprising a plurality of organic ligands surrounding a surface of the organic-inorganic-hybrid perovskite nanocrystal particle.
12. The organic-inorganic-hybrid perovskite nanocrystal particle light-emitter of claim 11 , wherein each of the organic ligands has a 2D structure comprising alkyl halide.
13. The organic-inorganic-hybrid perovskite nanocrystal particle light-emitter of claim 12 , wherein an alkyl structure of the alkyl halide comprises acyclic alkyl having a structure of C n H 2n+1 , primary alcohol, secondary alcohol, tertiary alcohol, alkylamine, p-substituted aniline, phenyl ammonium, or fluorine ammonium.
14. A light emitting device comprising:
a first electrode;
a second electrode; and
a light emitting layer disposed between the first electrode and the second electrode and comprising the organic-inorganic-hybrid perovskite nanocrystal particle light-emitter of claim 1 .
15. A method for manufacturing an organic-inorganic-hybrid perovskite nanocrystal particle light-emitter having a 2D structure, the method comprising steps of:
preparing a first solution in which organic-inorganic-hybrid perovskite having a 2D structure is dissolved in a polar solvent and a second solution in which an alkyl halide surfactant is dissolved in a non-polar solvent; and
mixing the first solution with the second solution to form the nanocrystal particle.
16. The method of claim 15 , wherein the step of mixing the first solution with the second solution comprises a step of dropping the first solution dropwise into the second solution to mix the first and second solutions with each other.
17. The method of claim 15 , wherein the organic-inorganic-hybrid perovskite has a structure of A 2 BX 4 , ABX 4 , or A n−1 BnX 3n+1 (where n is an integer between 2 to 6), and
the A is organic ammonium or metal cation, the B is a metal material, the X is a halogen element.
18. The method of claim 17 , wherein the A is (CH 3 NH 3 ) n , ((C x H 2x+1 ) n NH 3 ) 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 3 ) 2 (CF 3 NH 3 ) n , ((C x F 2x+1 ) n NH 3 ) 2 ), (CH(NH 2 ) 2 ), C x H 2x+1 (C(NH 2 ) 2 ), Cs, Rb, K, (C n F 2n+1 NH 3 ) 2 or a combination thereof (where n is an integer equal to or greater than 1, and x is an integer equal to or greater than 1),
the B is a divalent transition metal, a rare earth metal, an alkali earth metal, Pb, Sn, Ge, Ga, In, Al, Sb, Bi, Po, or a combination thereof, and
the X is Cl, Br, I, or a combination thereof.
19. The method of claim 17 , wherein the first solution is formed by mixing AX and BX 2 with the polar solvent at a predetermined ratio.