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Wavelength-Tuneable Near-Infrared Luminescence in Mixed Tin-Lead Halide Perovskites
Meiyue Liu1, Ru Zhao1, Fuhao Sun1
1Key Laboratory of Photovoltaic Materials, Henan University, Kaifeng, China.
Frontiers in Chemistry
|June 17, 2022
Summary
Researchers developed new mixed tin-lead perovskite near-infrared light-emitting diodes (NIR-LEDs). Tuning the tin-lead ratio achieved emission wavelengths over 950 nm, overcoming limitations of current devices for advanced applications.
Area of Science:
- Materials Science
- Optoelectronics
- Solid-State Physics
Background:
- Near-infrared light-emitting diodes (NIR-LEDs) are crucial for applications like night vision and biological imaging.
- Current perovskite NIR-LEDs using CsPbI3 and FAPbI3 are limited to 700-800 nm emission.
- Pure tin-based perovskites offer longer wavelengths but suffer from low efficiency and instability.
Purpose of the Study:
- To investigate mixed tin-lead halide perovskites for efficient and stable NIR-LEDs.
- To tune the emission spectra of perovskite NIR-LEDs beyond 800 nm.
- To understand the impact of cation composition on electronic properties and bandgap bowing.
Main Methods:
- Systematic investigation of optical properties in hybrid tin and lead iodide compounds.
- Tuning emission spectra by adjusting the tin:lead ratio.
- Comparison of absorption and photoluminescence emission properties across different compositions.
Main Results:
- Achieved tunable emission spectra red-shifting from 710 nm to over 950 nm by varying the Sn:Pb ratio.
- Demonstrated the potential of mixed Sn-Pb halide perovskites for efficient NIR-LEDs.
- Clarified the influence of cations on bandgap bowing and electronic properties.
Conclusions:
- Mixed tin-lead halide perovskites are promising for next-generation, low-cost, and efficient NIR-LEDs.
- Adjusting the Sn:Pb ratio is key to achieving longer emission wavelengths and improved stability.
- Understanding cation effects is vital for further optimizing perovskite optoelectronic devices.
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