Universal Existence of Localized Single-Photon Emitters in the Perovskite Film of All-Inorganic CsPbBr3 Microcrystals.
All-inorganic halide perovskites have drawn a lot of research attention very recently owing to their potential solution to the instability issue currently faced by the organic-inorganic counterparts. Meanwhile, the halide perovskites in a solid film are manifested as microscale morphologies whose functionalities are unavoidably affected by the interior or exterior presence of various nanoscale entities. Here all-inorganic solid films are fabricated with varying densities of single CsPbBr3 microcrystals, showing that very sharp photoluminescence peaks can be universally observed at 4 K with the linewidths being as narrow as hundreds of μeV. The single-photon emission nature is confirmed for such a photoluminescence peak, whose intensity is completely quenched above ≈30 K to suggest its possible origin from a low potential-energy region of the single microcrystal. The discovery of such a novel emitting species in halide perovskites, with the enriched structure-property relationship, will surely impart significant influences on the advancement of relevant optoelectronic devices and quantum-light sources.
['Feng|Shengnan|S|', 'Qin|Qilin|Q|', 'Han|Xiaopeng|X|', 'Zhang|Chunfeng|C|', 'Wang|Xiaoyong|X|https://orcid.org/0000-0003-1147-0051', 'Yu|Tao|T|', 'Xiao|Min|M|']
single-photon emitters microcrystals CsPbBr
3 all-inorganic perovskites