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Realizing Efficient Emission in Three-Dimensional CsCdCl3 Single Crystals by Introducing Separated Emitting Centers
Yan Zhang1, Lei Zhou1, Dan Li1
1Key Laboratory of Luminescence Analysis and Molecular Sensing (Southwest University), Ministry of Education, School of Chemistry and Chemical Engineering, Southwest University, Chongqing400715, People's Republic of China.
This study enhances the photoluminescence (PL) of 3D perovskite single crystals by doping with Mn2+ and Sn2+. Doping with Mn2+ yields intense orange emission, while Sn2+ doping produces efficient red emission, improving luminescence performance.
Area of Science:
- Materials Science
- Solid-State Physics
- Photochemistry
Background:
- Three-dimensional (3D) perovskite single crystals often show poor photoluminescence (PL) due to low exciton binding energy.
- Excitons in bulk 3D perovskites are spatially unconfined, limiting their radiative recombination efficiency.
Purpose of the Study:
- To improve the luminescence efficiency of 3D CsCdCl3 single crystals.
- To explore the effects of Mn2+ and Sn2+ doping on the optical properties of CsCdCl3.
- To demonstrate the potential of doped CsCdCl3 for white-light-emitting diode (WLED) applications.
Main Methods:
- Synthesis of 3D CsCdCl3 single crystals.
- Introduction of Mn2+ and Sn2+ dopants into the CsCdCl3 lattice.
- Characterization of photoluminescence properties, including PL quantum yield (PLQY).
- Fabrication of a WLED device using Mn2+-doped CsCdCl3.
Main Results:
- Undoped 3D CsCdCl3 exhibited low PL quantum yield (PLQY) of ~4.8% due to self-trapped excitons (STEs).
- Mn2+ doping resulted in intense orange emission (~100% PLQY) via d-d transitions.
- Sn2+ doping induced Jahn-Teller-like STEs, leading to efficient deep red emission (~28.22% PLQY).
- A WLED was successfully fabricated, showcasing potential for lighting applications.
Conclusions:
- Doping with Mn2+ and Sn2+ significantly enhances the luminescence of 3D CsCdCl3 single crystals.
- The unique bonding in CsCdCl3 facilitates efficient luminescence from Sn2+ related STEs.
- This work offers a new strategy for improving the luminescence of bulk 3D perovskite materials for optoelectronic applications.
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