Embedding Te⁴⁺ into Sn⁴⁺-Based Metal Halide To Passivate Structure Defects for High-Performance Light-Emitting...

Area of Science:

• Materials Science
• Solid-State Chemistry
• Optoelectronics

Background:

• Low-dimensional lead-halide hybrids are promising optical materials but face toxicity and stability issues.
• Lead-free tin(IV)-based metal halides offer environmental benefits and structural robustness.
• Existing tin(IV)-based halides exhibit poor photoluminescence (PL) with unclear mechanisms.

Purpose of the Study:

• To develop a stable tin(IV)-based halide hybrid.
• To enhance the photoluminescence properties of tin(IV)-based halides.
• To investigate the photoluminescence mechanisms in these materials for lighting applications.

Main Methods:

• Synthesis of a stable Sn(IV)-based halide hybrid, (C4H7N2)2SnCl6.
• Introduction of Te(IV) ions into the Sn(IV) halide lattice to enhance PL.
• Characterization of optical properties and investigation of emission mechanisms at room temperature and 80 K.
• Fabrication of white light-emitting diodes (WLEDs) using the developed material.

Main Results:

• A stable (C4H7N2)2SnCl6 hybrid was synthesized, exhibiting poor room temperature (RT) PL.
• Te(IV) doping resulted in broadband orange emission (~640 nm) with ~46% PL efficiency at RT.
• Triple emission bands were observed at 80 K, attributed to organic cations and Te(IV)-induced self-trapped states.
• High-performance WLEDs were fabricated, demonstrating practical lighting potential.

Conclusions:

• Te(IV) doping significantly enhances the PL efficiency of Sn(IV)-based halide hybrids.
• The study provides insights into the PL mechanisms of Sn(IV)-based metal-halide hybrids.
• The developed material is a promising candidate for eco-friendly lighting applications.