Related Experiment Video
Updated: Jun 12, 2025
11:06
Fabrication of Fully Solution Processed Inorganic Nanocrystal Photovoltaic Devices
Published on: July 8, 2016
10.4K
In Situ Fabrication of Highly Efficient and Stable Cs2NaInCl6: Sb3+@PVDF Composite Films for Optoelectronic Devices
Wen Li1, Yongrun Dong1, Ting Xie2,3,4
1Guangxi Key Lab of Processing for Non-ferrous Metals and Featured Materials and Key Lab of New Processing Technology for Nonferrous Metals and Materials, Ministry of Education; School of Resources, Environmental and Materials, Guangxi University, Nanning 530004, China.
ACS Applied Materials & Interfaces
|September 23, 2024
Summary
Lead-free double perovskites (DPs) are now easier to prepare in flexible films using a novel in situ method. This advancement enhances their potential for stable, bright blue light-emitting devices and optoelectronics.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Optoelectronics
Background:
- Lead-free double perovskites (DPs) offer promising phase stability and optical properties for illumination and display applications.
- Traditional DPs preparation involves high-temperature heating and hazardous solvents, limiting scalability and increasing costs.
- A need exists for safer, more cost-effective, and versatile methods for DPs synthesis.
Purpose of the Study:
- To develop an in situ fabrication strategy for synthesizing lead-free Cs2NaInCl6: Sb3+ double perovskites within polyvinylidene difluoride (PVDF) films.
- To optimize the luminescent properties of the resulting Cs2NaInCl6: Sb3+@PVDF composite films (CFs).
- To investigate the origin of the excellent optical and environmental stability of the prepared DPs.
Main Methods:
- In situ fabrication of Cs2NaInCl6: Sb3+@PVDF composite films using dimethyl sulfoxide (DMSO) as a solvent.
- Photoluminescence (PL) spectroscopy to evaluate luminescence intensity and optimize doping concentrations.
- Photoluminescence quantum yield (PLQY) measurements, fluorescence lifetime analysis, temperature-dependent PL spectroscopy, and density functional theory (DFT) calculations.
- Environmental stability tests (water immersion, high temperature, UV radiation) and fabrication of a blue light-emitting device (LED).
Main Results:
- Achieved bright blue emission from Cs2NaInCl6: Sb3+@PVDF CFs under 302 nm irradiation.
- Optimized Sb3+ doping significantly enhanced PLQY from 0.72% to 83.77%, with fluorescence lifetimes of 131.08 ns and 1048.52 ns.
- Demonstrated excellent environmental stability and successful assembly of a stable blue LED.
Conclusions:
- The in situ strategy using DMSO offers a safer and potentially more cost-effective route for DPs preparation.
- The excellent optical properties are attributed to self-trapped excitons (STEs) within the perovskite structure.
- The developed composite films show significant potential for commercial applications in high-performance optoelectronic devices.
