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Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
Published on: October 1, 2019
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Influence of Triplet Diffusion on Lead Halide Perovskite-Sensitized Solid-State Upconversion
Sarah Wieghold1, Alexander S Bieber1, Zachary A VanOrman1
1Department of Chemistry and Biochemistry , Florida State University , Tallahassee , Florida 32306 , United States.
The Journal of Physical Chemistry Letters
|June 28, 2019
Summary
Lead halide perovskites enhance rubrene upconversion via triplet-triplet annihilation (TTA). Higher triplet populations near the interface reduce visible emission due to back-transfer, impacting photoluminescence quantum yield.
Area of Science:
- Materials Science
- Photochemistry
- Optoelectronics
Background:
- Lead halide perovskites are promising for upconversion applications.
- Triplet-triplet annihilation (TTA) is a key mechanism for upconversion.
- Rubrene is a common organic material used in TTA.
Purpose of the Study:
- Investigate the role of triplet population in perovskite-sensitized TTA upconversion in rubrene.
- Understand the relationship between triplet population, diffusion length, and upconverted emission.
- Analyze the impact of perovskite/rubrene interface on photoluminescence quantum yield.
Main Methods:
- Fabrication of perovskite-sensitized rubrene films.
- Spectroscopic analysis of upconverted emission.
- Time-resolved photoluminescence measurements.
- Investigating triplet state dynamics and diffusion.
Main Results:
- Observed two independent rates of TTA.
- Demonstrated a sharp drop in visible emission intensity over time.
- Correlated TTA rates and emission intensity with triplet population density and diffusion length.
- Identified proximity to perovskite interface as a factor in reduced singlet state emission.
Conclusions:
- Triplet population density significantly influences TTA efficiency and upconverted emission in perovskite-rubrene systems.
- Diffusion-mediated TTA dynamics are dependent on triplet population.
- Back-transfer of singlet states to the perovskite layer reduces observed photoluminescence quantum yield, especially at high triplet populations near the interface.
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