Related Experiment Video
Updated: Jun 21, 2025
08:12
Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
Published on: September 8, 2017
9.6K
Near-Full-Spectrum Emission Realized in a Single Lead Halide Perovskite across the Visible-Light Region
Lian-Cai An1, Zi-Ying Li2, Muhammad Azeem2,3
1College of Chemistry and Chemical Engineering, Qingdao University, Qingdao, 266071, China.
Angewandte Chemie (International Ed. in English)
|July 16, 2024
Summary
Researchers achieved near-full-spectrum photoluminescence (PL) in a single hybrid perovskite material using high-pressure treatment. This breakthrough enables tunable, wide-spectrum light emission from one material.
Area of Science:
- Materials Science
- Solid-State Physics
- Photochemistry
Background:
- Achieving full-spectrum emission from a single material is a significant challenge in photoluminescence (PL) research.
- Two-dimensional (2D) hybrid lead halide perovskites offer potential for tunable optical properties.
Purpose of the Study:
- To engineer near-full-spectrum PL emission in a single-component 2D hybrid lead halide perovskite.
- To investigate the mechanism of pressure-induced spectral changes.
Main Methods:
- High-pressure treatment of (ETA)2PbBr4 (ETA+=(HO)(CH2)2NH3+).
- Analysis of pressure-induced phase transitions (orthorhombic to monoclinic).
- Investigation of hydrogen bonding and structural dynamics.
Main Results:
- Near-full-spectrum PL emission (424–620 nm) achieved in (ETA)2PbBr4.
- Pressure induces a phase transition and band gap narrowing.
- Hydrogen bonding modulates structural changes and emission spectra.
Conclusions:
- High-pressure treatment is an effective method for achieving wide-spectrum PL emission in single halide perovskites.
- The study demonstrates a pathway for developing single-material light sources with tunable, broad emission.
Related Concept Videos
01:32UV–Vis Spectroscopy of Conjugated Systems
6.9K
Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
One of the factors influencing λmax is the extent...
One of the factors influencing λmax is the extent...
6.9K
02:39Emission Spectra
51.8K
When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present.
51.8K
01:23Photoluminescence: Fluorescence and Phosphorescence
2.0K
Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
A pair of electrons in a...
A pair of electrons in a...
2.0K