期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 12, 期 46, 页码 11371-11377出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.1c03437
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资金
- European Research Council [759744]
- Deutsche Forschungsgemeinsschaft (DFG) under Germany's Excellence Strategy [EXC 2089/1390776260]
- Bavarian State Ministry of Science, Research and Arts through the grant Solar Technologies go Hybrid (SolTech)
- European Research Council (ERC) [759744] Funding Source: European Research Council (ERC)
The thickness-tunable 2D halide perovskite nanoplatelets show a dependence of photoluminescence linewidth and maximum emission wavelength on thickness, with the thinnest nanoplatelets exhibiting the smallest temperature-induced broadening. The effects are attributed to the combined interaction of exciton-phonon coupling and thermal lattice expansion.
Semiconductor nanocrystals are receiving increased interest as narrow-band emitters for display applications. Here, we investigate the underlying photoluminescence (PL) linewidth broadening mechanisms in thickness-tunable 2D halide perovskite (Csn-1PbnBr3n+1) nanoplatelets (NPLs). Temperature-dependent PL spectroscopy on NPL thin films reveals a blue-shift of the PL maximum for thicker NPLs, no shift for three monolayer (ML) thick NPLs, and a red-shift for the thinnest (2 ML) NPLs with increasing temperature. Emission linewidths also strongly depend on NPL thickness, with the thinnest NPLs showing the smallest temperature-induced broadening. We determine the combined interaction of exciton-phonon coupling and thermal lattice expansion to be responsible for both effects. Additionally, the 2 ML NPLs exhibit a significantly larger Frohlich coupling constant and optical phonon energy, possibly due to an inversion in the exciton fine structure. These results illustrate that ultrathin halide perovskite NPLs could illuminate the next generation of displays, provided a slightly greater sample homogeneity and improved stability.
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