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Modulating Ultraviolet-Visible-Near Infrared Emission in Hybrid Metal Halides via ns2 Ion Doping
Cheng Li1, Hui Li1, Zishao Wang1
1Institute of Ultrafast Optical Physics, Department of Applied Physics and MIIT Key Laboratory of Semiconductor Microstructure and Quantum Sensing, Nanjing University of Science and Technology, Nanjing, 210094, P. R. China.
Researchers developed new hybrid metal halide phosphors for tunable broad-spectrum luminescence. These materials offer efficient UV emission and broadband coverage across UV-vis-NIR, enabling advanced optoelectronic applications.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Optoelectronics
Background:
- Broad-spectrum luminescent materials are crucial for advanced optoelectronics.
- Conventional materials struggle with efficient UV emission and integrating multiple spectral components.
Purpose of the Study:
- To design and synthesize novel hybrid metal halide phosphors with tunable broad-spectrum luminescence.
- To investigate the relationship between lattice distortion and photoluminescence properties.
Main Methods:
- Synthesis of hybrid metal halide phosphors [(DFPD)2MCl4·H2O, M = Cd/Zn] doped with various ns2 ions (Sn2+, Pb2+, Sb3+, Bi3+, Te4+).
- Characterization of photoluminescence properties, including photoluminescence quantum yield (PLQY).
- Fabrication of a white light emitter and assessment of its performance (CRI, CCT).
Main Results:
- Reduced lattice distortion correlated with enhanced PLQY and broadband emission (UV-vis-NIR).
- Highly efficient UV emission (93% PLQY) achieved with 2% Pb-doped (DFPD)2CdCl4·H2O.
- Demonstrated a white light emitter with CRI of 92.9 and CCT of 6087 K.
- Promising functionalities in NIR imaging and multi-level anti-counterfeiting were observed.
Conclusions:
- The study elucidates the interplay between lattice distortion and exciton dynamics in Cd/Zn-based hybrid metal halides.
- A versatile strategy for designing next-generation broadband multifunctional optoelectronic materials was established.
- These phosphors show potential for applications in lighting, imaging, and security.
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