Scintillators and applications thereof

1. A crystalline particle comprising:

a radiation absorption region comprising at least one metal halide; and

a spatially discrete radiative exciton recombination region operable to receive excitons produced in the radiation absorption region, the discrete radiative exciton recombination region having a size of 1 nm to 10 nm and the radiation absorption region having a size of 10 nm to 500 nm, wherein the spatially discrete radiative recombination region is disposed between the radiation absorption region and an exterior surface of the crystalline particle.

2. The crystalline particle of claim 1 , wherein the spatially discrete radiative exciton recombination region comprises a metal halide comprising one or more scintillation activators.

3. The crystalline particle of claim 1 , wherein the spatially discrete radiative exciton recombination region is a shell at least partially surrounding the radiation absorption region.

4. The crystalline particle of claim 1 , wherein the metal halide comprises an alkali halide, an alkaline earth halide or a transition metal halide.

5. The crystalline particle of claim 4 , wherein the alkali halide comprises cesium iodide, sodium iodide or potassium iodide.

6. The crystalline particle of claim 5 , wherein the spatially discrete radiative exciton recombination region comprises an alkali halide comprising a thallium scintillation activator.

7. The crystalline particle of claim 4 , wherein the alkaline earth halide comprises strontium iodide, barium iodide or barium bromide iodide.

8. The crystalline particle of claim 7 , wherein the spatially discrete radiative exciton recombination region comprises an alkaline earth halide comprising a europium scintillation activator.

9. The crystalline particle of claim 4 , wherein the metal of the transition metal halide is selected from the group consisting of metallic elements of Groups IB, IIB, IIIB, IIIA, IVA and VA of the Periodic Table.

10. The crystalline particle of claim 1 , wherein the radiation absorption region comprises strontium iodide and the spatially discrete radiative exciton recombination region comprises strontium iodide comprising a europium scintillation activator.

11. The crystalline particle of claim 1 further comprising an exciton confinement region adjacent to the spatially discrete radiative exciton recombination region.

12. A crystalline particle comprising:

radiation absorption region comprising strontium iodide; and

a spatially discrete radiative exciton recombination region operable to receive excitons produced in the radiation absorption region, the discrete radiative exciton recombination region comprising strontium iodide having a europium scintillation activator, wherein the spatially discrete radiative recombination region is disposed between the radiation absorption region and an exterior surface of the crystalline particle.

13. The crystalline particle of claim 12 , wherein the discrete radiative exciton recombination region has a size of 1 nm to 10 nm and the radiation absorption region has a size of 10 nm to 500 nm.

14. The crystalline particle of claim 12 further comprising an exciton confinement region adjacent to the spatially discrete radiative exciton recombination region.

15. The crystalline particle of claim 12 , wherein the spatially discrete radiative exciton recombination region is a shell at least partially surrounding the radiation absorption region.

16. The crystalline particle of claim 12 , wherein the radiation absorption region has a carrier mobility of 1×10 4 cm 2 /V·s to 1000 cm 2 /V·s.

17. The crystalline particle of claim 12 , wherein the europium scintillation activator is present in the discrete radiative recombination region in an amount of 0.1 mol % to 10 mol %.

18. The crystalline particle of claim 12 comprising a plurality of the spatially discrete radiative exciton recombination regions.

19. The crystalline particle of claim 12 , wherein the radiation absorption region is single crystalline.