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Updated: Jun 14, 2025
04:14
Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
Published on: October 1, 2019
12.9K
Structural Changes and Differences in Intrinsic Photoluminescence of Four Cationic Two-Dimensional Lead Halide
Xuqing Jin1, Junfei Wang1, Chengdong Peng1
1Key Laboratory of Carbon Materials of Zhejiang Province, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, P. R. China.
Inorganic Chemistry
|August 31, 2024
Summary
Researchers synthesized novel luminescent hybrid organolead halide materials, revealing how structural changes impact their light-emitting properties. This discovery offers insights into self-trapped excitons and potential applications in white light-emitting diodes (WLEDs).
Area of Science:
- Materials Science
- Solid-State Chemistry
- Photophysics
Background:
- Hybrid organolead halide materials with cationic inorganic frameworks show promise for visible light applications due to their chemical inertness.
- Understanding the relationship between structural modifications and luminescence properties is crucial for optimizing these materials.
Purpose of the Study:
- To synthesize and characterize novel hybrid organolead halide structures with varying luminescence properties.
- To elucidate the correlation between structural distortions, electronic properties, and luminescence mechanisms.
Main Methods:
- Single crystal synthesis of [Pb2X3](PDAH)(H2O) and [Pb11X14](PDA)4 using a hydrothermal method at different temperatures.
- X-ray crystallography to analyze structural differences and PbII coordination environments.
- Density Functional Theory (DFT) calculations to investigate band gap characteristics and electronic structures.
Main Results:
- Two distinct crystal structures, [Pb2X3](PDAH)(H2O) and [Pb11X14](PDA)4, were successfully synthesized.
- Significant differences in luminescence properties were observed, linked to varying degrees of PbII center distortion and altered electron-phonon coupling.
- DFT calculations confirmed distinct band gap characteristics influenced by inorganic-organic component ratios.
- [Pb11Br14](PDA)4 exhibited broadband orange emission with a high photoluminescence quantum efficiency (PLQE) of 86%.
Conclusions:
- Synthesis temperature critically influences the structure and luminescence of hybrid organolead halides.
- Structural distortions and electronic band structures are key factors governing self-trapped exciton emission.
- The high PLQE and emission characteristics of [Pb11Br14](PDA)4 suggest its potential for white light-emitting diode (WLED) applications.
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