Air stable and highly efficient Bi3+-doped Cs2SnCl6 for blue light-emitting diodes
Yue Yao1,2, Si-Wei Zhang1, Zijian Liu1,2
1Tsinghua-Berkeley Shenzhen Institute (TBSI), Tsinghua University Shenzhen 518055 China wangcy0317@gmail.com malan@sz.tsinghua.edu.cn weiguodan@sz.tsinghua.edu.cn.
RSC Advances
|April 28, 2022
Summary
Bismuth-doped cesium tin hexachloride perovskites offer enhanced luminescence for optoelectronic applications. This research demonstrates their stability and potential for developing efficient blue light-emitting diodes (LEDs).
Area of Science:
- Materials Science
- Solid-State Chemistry
- Optoelectronics
Background:
- Cesium tin hexachloride (Cs2SnCl6) perovskites are explored as stable, less toxic alternatives to lead-based optoelectronic materials.
- Current Cs2SnCl6 luminescence performance is insufficient for many applications.
- Bismuth (Bi3+) doping is investigated to enhance luminescence properties.
Purpose of the Study:
- To synthesize and characterize Bi3+-doped Cs2SnCl6 (Cs2SnCl6:Bi3+) via a solution-phase route.
- To investigate the effect of initial Sn2+ concentration on doping, crystal growth, and photophysical properties.
- To evaluate the potential of Cs2SnCl6:Bi3+ as a phosphor for blue light-emitting diodes (LEDs).
Main Methods:
- Solution-phase synthesis of Cs2SnCl6:Bi3+ perovskites.
- Tuning initial Sn2+ concentration to control nucleation and crystal growth.
- Characterization of crystal morphology, doping levels, and photophysical properties.
- Fabrication and testing of blue LED devices using Cs2SnCl6:Bi3+ phosphors.
Main Results:
- Initial Sn2+ concentration influences Bi3+ doping, crystal morphology, and photophysical properties.
- Synthesized Cs2SnCl6:Bi3+ exhibits excellent atmospheric stability.
- Achieved photoluminescence (PL) at ~456 nm with a photoluminescence quantum yield (PLQY) of 31%.
- Luminescence attributed to [BiSn3+ + VCl] defects.
- Blue LED demonstrated stable operation (~120 h) with CIE coordinates (0.14, 0.11).
Conclusions:
- A strategy for synthesizing stable, Bi3+-doped perovskites was developed.
- Cs2SnCl6:Bi3+ shows promising luminescence and stability for optoelectronic applications.
- This work facilitates the development of Cs2SnCl6:Bi3+ for blue LED applications.
