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PreprintCC BY-NCChemRxiv

Capturing Transient Growth Windows for Narrow-Emitting Perovskite Nanoplatelets

  • Leo Luber1,2,3
  • Maximilian Dörfler1,2,3
  • Jonathan Paul1,2,3
  • Nina A. Henke1,2,3
  • Jakob Möller1,2,3
  • Sebastian Sturm1,2,4
  • Luca Reim1,2,3
  • Tim Hashagen1,2,3
  • Knut Müller-Caspary1,2,4
  • Alexander S. Urban1,2,3
4 affiliations
  1. 1Center for NanoScience (CeNS)
  2. 2Ludwig-Maximilians-Universität (LMU) München
  3. 3Nanospectroscopy Group, Department of Physics
  4. 4Department of Chemistry
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Abstract

Colloidal perovskite nanoplatelets offer thickness-tunable, directional emission, but maintaining narrow ensemble photoluminescence linewidths at greater thicknesses remains challenging. Here, we show that under selected reaction conditions, distinct CsPbBr3 nanoplatelet thickness populations emerge in succession during synthesis, each offering a transient window for isolation before further morphological evolution. By tuning growth kinetics through precursor composition and overall dilution under ambient conditions, we make these windows experimentally accessible. In situ photoluminescence monitoring tracks the successive populations and guides the time-selective isolation of 4- and 5-monolayer nanoplatelets. The resulting ensembles exhibit narrow cyan emission with linewidths down to 70 and 80 meV, respectively. Post-synthetic surface treatment increases the photoluminescence quantum yield to 70 % while preserving narrow emission, and halide exchange extends the approach to red-emitting iodide nanoplatelets. These findings demonstrate that favorable nanoplatelet morphologies can be accessed as transient populations along a growth trajectory, establishing control over growth kinetics and isolation time as a strategy for obtaining narrow-emitting colloidal nanostructures.

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Cite

BibTeXRIS
BibTeX
@misc{luber2026capturing,
  title = {{Capturing Transient Growth Windows for Narrow-Emitting Perovskite Nanoplatelets}},
  author = {Leo Luber and Maximilian Dörfler and Jonathan Paul and Nina A. Henke and Jakob Möller and Sebastian Sturm and Luca Reim and Tim Hashagen and Knut Müller-Caspary and Alexander S. Urban},
  howpublished = {ChemRxiv},
  year = {2026},
  month = oct,
  doi = {10.26434/chemrxiv.15011023/v1},
  url = {https://chemrxiv.org/doi/full/10.26434/chemrxiv.15011023/v1},
  note = {CC BY-NC},
}
RIS
TY  - UNPB
TI  - Capturing Transient Growth Windows for Narrow-Emitting Perovskite Nanoplatelets
AU  - Leo Luber
AU  - Maximilian Dörfler
AU  - Jonathan Paul
AU  - Nina A. Henke
AU  - Jakob Möller
AU  - Sebastian Sturm
AU  - Luca Reim
AU  - Tim Hashagen
AU  - Knut Müller-Caspary
AU  - Alexander S. Urban
PY  - 2026
DA  - 2026/10/25
PB  - ChemRxiv
DO  - 10.26434/chemrxiv.15011023/v1
UR  - https://chemrxiv.org/doi/full/10.26434/chemrxiv.15011023/v1
AB  - Colloidal perovskite nanoplatelets offer thickness-tunable, directional emission, but maintaining narrow ensemble photoluminescence linewidths at greater thicknesses remains challenging. Here, we show that under selected reaction conditions, distinct CsPbBr3 nanoplatelet thickness populations emerge in succession during synthesis, each offering a transient window for isolation before further morphological evolution. By tuning growth kinetics through precursor composition and overall dilution under ambient conditions, we make these windows experimentally accessible. In situ photoluminescence monitoring tracks the successive populations and guides the time-selective isolation of 4- and 5-monolayer nanoplatelets. The resulting ensembles exhibit narrow cyan emission with linewidths down to 70 and 80 meV, respectively. Post-synthetic surface treatment increases the photoluminescence quantum yield to 70 % while preserving narrow emission, and halide exchange extends the approach to red-emitting iodide nanoplatelets. These findings demonstrate that favorable nanoplatelet morphologies can be accessed as transient populations along a growth trajectory, establishing control over growth kinetics and isolation time as a strategy for obtaining narrow-emitting colloidal nanostructures.
ER  -