Journal
ADVANCED SCIENCE
Volume 6, Issue 13, Pages -Publisher
WILEY
DOI: 10.1002/advs.201900462
Keywords
blue emission; cesium lead halide perovskite; nanoplatelets; quantum wells; self-assembly
Categories
Funding
- National Science Foundation of China [51961135107, 51774034, 51772026, 21801013]
- National Key Research and Development Program of China [2017YFE0119700]
- Beijing Natural Science Foundation [2182039]
- National Natural Science Foundation of China/Research Grants Council Joint Research Scheme [N_CityU108/17]
- Talent Introduction Plan of Overseas Top Ranking Professors by the State Administration of Foreign Expert Affairs [MSBJLG040]
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Colloidal all-inorganic perovskite nanocrystals have gained significant attention as a promising material for both fundamental and applied research due to their excellent emission properties. However, reported photoluminescence quantum yields (PL QYs) of blue-emitting perovskite nanocrystals are rather low, mostly due to the fact that the high energy excitons for such wide bandgap materials are easily captured by interband traps, and then decay nonradiatively. In this work, it is demonstrated how to tackle this issue, performing self-assembly of 2D perovskite nanoplatelets into larger size (approximate to 50 nm x 50 nm x 20 nm) cuboid crystals. In these structures, 2D nanoplatelets being isolated from each other within the cuboidal scaffold by organic ligands constitute multiple quantum wells, where exciton localization on potential disorder sites helps them to bypass nonradiative channels present in other platelets. As a result, the cuboid crystals show an extremely high PL QY of 91% of the emission band centered at 480 nm. Moreover, using the same synthetic method, mixed-anion CsPb(Br/Cl)(3) cuboid crystals with blue emission peaks ranging from 452 to 470 nm, and still high PL QYs in the range of 72-83% are produced.
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