Organic-inorganic hybrid perovskite nanocrystals and methods of making the same

1. A nanoparticle composition comprising:

a layer of organic-inorganic perovskite nanocrystals, the organic-inorganic perovskite nanocrystals comprising surfaces associated with ligands of size unable to incorporate into octahedral corner sites of the perovskite crystal structure, wherein the ligands form a matrix in which the organic-inorganic perovskite nanocrystals are dispersed.

2. The nanoparticle composition of claim 1 , wherein the organic-inorganic nanocrystals have an average size less than 50 nm.

3. The nanoparticle composition of claim 1 , wherein the organic-inorganic nanocrystals have an average size less than 20 nm.

4. The nanoparticle composition of claim 1 , wherein the organic-inorganic nanocrystals have an average size less than 15 nm.

5. The nanoparticle composition of claim 1 , wherein the organic-inorganic nanocrystals have an average size of 1-10 nm.

6. The nanoparticle composition of claim 1 , wherein the organic-inorganic perovskite nanocrystals are of the formula Me 1-y A y BX 3-z Y z , wherein Me is an alkali or alkaline earth metal cation, A is an organic cation, B is an element selected from the group consisting of transition metals, Group IVA elements and rare earth elements and X and Y are independently selected from Group VIIA elements, wherein 0<y<1 and wherein 0≤z<3.

7. The nanoparticle composition of claim 1 , wherein the ligands comprise organoammonium ions.

8. The nanoparticle composition of claim 7 , wherein the organoammonium ions comprise one or more substituents selected from the group consisting of alkyl, heteroalkyl, alkenyl, cycloalkyl, cycloalkenyl, heterocycloalkyl, aryl and heteroaryl.

9. The nanoparticle composition of claim 1 , wherein the layer of organic-inorganic perovskite nanocrystals has root mean square (RMS) surface roughness less than 10 nm.

10. The nanoparticle composition of claim 1 , wherein the layer of organic-inorganic perovskite nanocrystals has RMS roughness less than 1 nm.

11. The nanoparticle composition claim 1 , wherein the layer of organic-inorganic perovskite nanocrystals is pinhole free.

12. The nanoparticle composition of claim 1 , wherein the layer of organic-inorganic perovskite nanocrystals exhibits peak light emission in the visible or infrared region of the electromagnetic spectrum.

13. The nanoparticle composition of claim 7 , wherein the organoammonium ions comprise one or more substituents selected from the group consisting of branched alkyl, cycloalkyl, cycloalkenyl, heterocycloalkyl, aryl, and heteroaryl.

14. The nanoparticle composition of claim 7 , wherein the organoammonium ions comprise one or more substituents selected from the group consisting of aryl and heteroaryl.

15. The nanoparticle composition of claim 7 , wherein the organoammonium ions comprise one or more substituents selected from the group consisting of 4-fluorophenylmethylammonium, phenylammonium, and phenylalkylammonium.

16. The nanoparticle composition of claim 1 , wherein the matrix is amorphous.

17. A nanoparticle composition comprising:

a layer of organic-inorganic perovskite nanocrystals, the organic-inorganic perovskite nanocrystals comprising surfaces associated with ligands of size unable to incorporate into octahedral corner sites of the perovskite crystal structure, wherein the ligands comprise organoammonium ions including one or more substituents selected from the group consisting of branched alkyl, cycloalkyl, cycloalkenyl, heterocycloalkyl, aryl, and heteroaryl.

18. The nanoparticle composition of claim 16 , wherein the organoammonium ions comprise one or more substituents selected from the group consisting of aryl and heteroaryl.

19. The nanoparticle composition of claim 17 , wherein the organoammonium ions comprise one or more substituents selected from the group consisting of 4-fluorophenylmethylammonium, phenylammonium, and phenylalkylammonium.