期刊
NANO LETTERS
卷 17, 期 7, 页码 4534-4540出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b02147
关键词
Perovskite; nanocrystal; oriented emission; CsPbBr3
类别
资金
- Inorganic/Organic Nanocomposites Program [KC3104]
- Lawrence Berkeley National Laboratory, U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division [DE-AC02-05-CH11231]
- Advanced Research Projects Agency Energy (ARPA-E), U.S. Department of Energy [DE-AR0000627]
- Bavaria California Technology Center (BaCaTeC)
- German Ministry for Education and Research (BMBF) [13N13664]
- Deutsche Forschungsgemeinschaft (DFG) [Br 1728/18-1]
We report controllable anisotropic light emission of photons originating from vertically aligned transition dipole moments in spun-cast films of CsPbBr3 nanocubes. By depositing films of nanocrystals on precoated substrates we can control the packing density and resultant radiation pattern of the emitted photons. We develop a technical framework to calculate the average orientation of light emitters, i.e., the angle between the transition dipole moment vector (TDM) and the substrate. This model is applicable to any emissive material with a known refractive index. Theoretical modeling indicates that oriented emission originates from an anisotropic alignment of the valence band and conduction band edge states on the ionic crystal lattice and demonstrates a general path to model the experimentally less accessible internal electric field of a nanosystem from the photoluminescent anisotropy. The uniquely accessible surface of the perovskite nanoparticles allows for perturbation of the normally isotropic emissive transition. The reported sensitive and tunable TDM orientation and control of emitted light will allow for applications of perovskite nanocrystals in a wide range of photonic technologies inaccessible to traditional light emitters.
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