jz8b02477_si_002.pdf (2.23 MB)
Point Defects and Green Emission in Zero-Dimensional Perovskites
journal contribution
posted on 2018-09-05, 00:00 authored by Jun Yin, Haoze Yang, Kepeng Song, Ahmed M. El-Zohry, Yu Han, Osman M. Bakr, Jean-Luc Brédas, Omar F. MohammedZero-dimensional
(0D) perovskites have recently opened a new frontier
in device engineering for light conversion technologies due to their
unprecedented high photoluminescence quantum yield as solids. Although
many experimental and theoretical efforts have been made to understand
their optical behavior, the origin of their green emission is still
opaque. Here, we develop a complete experimental and theoretical picture
of point defects in Cs–Pb–Br perovskites and demonstrate
that bromide vacancies (VBr) in prototype 0D perovskite
Cs4PbBr6 have a low formation energy and a relevant
defect level to contribute to the midgap radiative state. Moreover,
the state-of-the-art characterizations including atomic-resolution
electron imaging not only confirm the purity of the 0D phase of Br-deficient
green-emissive Cs4PbBr6 nanocrystals (NCs) but
also exclude the presence of CsPbBr3 NCs impurities. Our
findings provide robust evidence for defect-induced green luminescence
in 0D perovskite NCs, which helps extend the scope of the utility
of these bulk 0D quantum materials in optoelectronic applications.
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bulk 0 D quantum materialsatomic-resolution electron imagingV Brprototype 0 D perovskite Cs 4 PbBr 6CsPbBr 3 NCs impuritiespoint Defects0 D phaselight conversion technologiesmidgap radiative stateformation energyBr-deficient green-emissive Cs 4 PbBr 6 nanocrystalsdefect levelphotoluminescence quantumoptoelectronic applicationsdevice engineeringbromide vacanciesGreen Emissionpoint defects0 D perovskite NCs
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