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Stable Sn-Based Hybrid Perovskite-Related Structures with Tunable Color Coordinates via Organic Cations in
Aarya Prabhakaran1,2, Balaji Dhanabalan1, Iryna Andrusenko3
1Center for Convergent Technologies, Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy.
ACS Energy Letters
|June 16, 2023
Summary
Researchers developed a new, simple method to create lead-free layered perovskites for lighting. By changing organic cations, they tuned the light emission properties, achieving high efficiency without harsh conditions.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Photonic Materials
Background:
- Organic-inorganic lead-free layered perovskites are efficient broadband emitters, showing promise for lighting applications.
- Current synthesis methods require controlled atmospheres, high temperatures, and long preparation times, limiting emission tunability.
- Tuning emission via organic cations is common in lead-based perovskites but underexplored in lead-free alternatives.
Purpose of the Study:
- To develop a facile synthetic protocol for lead-free layered perovskites under ambient conditions.
- To investigate the tunability of optical properties, including chromaticity and photoluminescence quantum yield (PLQY), by varying organic monocations.
- To understand the structure-property relationships concerning octahedra connectivity and optical characteristics.
Main Methods:
- Developed a simplified synthetic protocol performed under air at 4 °C.
- Utilized X-ray diffraction and 3D electron diffraction for structural analysis.
- Characterized optical properties, including photoluminescence quantum yield (PLQY) and chromaticity coordinates.
Main Results:
- Synthesized Sn-Br layered perovskite-related structures with tunable chromaticity coordinates and high PLQY (up to 80%).
- Demonstrated diverse octahedra connectivity (disconnected and face-sharing) influencing optical properties.
- Confirmed preservation of organic-inorganic layer intercalation across different structures.
Conclusions:
- A facile, air-stable, low-temperature synthetic route for lead-free layered perovskites was established.
- Organic cation choice significantly impacts the structural diversity and optical properties of these materials.
- This work provides a new strategy for tuning the color coordinates of lead-free layered perovskites through tailored organic cations.
