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Double Emission and Reversible Thermochromic Luminescence Based Sn2+:(NH4)4CdCl6 Single Crystal for
Shuai Zhang1, Shuang Jie1, Kerou Yang1
1College of Physics, Qingdao University, Ningxia Road No. 308, Qingdao 266071, China.
Inorganic Chemistry
|January 16, 2026
Summary
Researchers developed a novel Sn²⁺-doped metal halide crystal for advanced anticounterfeiting. This material exhibits dual emissions and stable thermochromic luminescence, enhancing security applications.
Area of Science:
- Materials Science
- Optoelectronics
- Solid-State Chemistry
Background:
- Metal halide materials offer multimodal optical responses crucial for anticounterfeiting.
- Existing methods often rely on expensive or unstable dopants, limiting practical use.
Purpose of the Study:
- To develop a cost-effective and stable metal halide material with multimodal optical responses for anticounterfeiting.
- To explore Sn²⁺ doping in (NH₄)₄CdCl₆ crystals for novel optical properties.
Main Methods:
- Synthesized Sn²⁺-doped (NH₄)₄CdCl₆ single crystals.
- Investigated the formation of Self-Trapped Excitons (STE) and Defect-Bound Excitons (DBE).
- Characterized optical responses, including thermochromic luminescence and photoluminescence quantum yield (PLQY).
Main Results:
- Achieved dual emission centers (STE and DBE) through Sn²⁺ doping.
- Demonstrated reversible thermochromic luminescence and a high PLQY of 41.23%.
- Exhibited excellent structural stability, maintaining integrity for over six months under ambient conditions.
Conclusions:
- The Sn²⁺-doped metal halide crystal presents a promising strategy for multimodal optical responses.
- The material shows potential for advanced lighting and optical anticounterfeiting applications.
- This work offers a new design paradigm for developing functional metal halide materials.
