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Lead-Free Perovskite Light-Emitting Diodes: Research Progress and Future Prospects

12/26/2024 12:58:23 AM

Perovskite materials, with their unique optoelectronic properties, have shown tremendous potential in applications such as solar cells, light-emitting diodes (LEDs), and photodetectors. However, the stability and environmental issues associated with traditional lead-based perovskites have limited their further development. Therefore, lead-free perovskite light-emitting diodes (PeLEDs), as a new generation of environmentally friendly luminescent materials, are becoming a hot topic of research.

1. High-Efficiency and Stable Lead-Free Perovskite LEDs

Recently, a team led by Academician Huang Wei from Northwestern Polytechnical University, in collaboration with researchers from Nanjing Tech University and Changzhou University, has made a significant breakthrough in the field of perovskite LEDs. They significantly improved the photoluminescence quantum efficiency by accelerating the radiative recombination rate, which resulted in an external quantum efficiency of over 30% for perovskite LEDs. This achievement not only demonstrates the potential of lead-free perovskite LEDs in terms of efficiency but also provides new possibilities for their application in high-end display technologies.

2. Mechanism of White Light Emission from Lead-Free Double Perovskites

The team of Yuan Kaijun and Sui Laizhi from the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, used high-pressure ultrafast spectroscopy to reveal the mechanism behind the white light emission of lead-free double perovskite Cs2NaInCl6:Sb3+ crystals under high pressure. The study showed that under high pressure, the Cs2NaInCl6:Sb3+ crystals experience a phase transition, and the intensity of self-trapped excitons (STEs) in the emission significantly increases by 160 times, exhibiting white light emission after the release of high pressure. This discovery provides a new pathway for achieving broadband white light emission from a single component.

3. Strategies for Efficiency Improvement of Lead-Free Perovskite LEDs

Scientists are exploring various strategies to enhance the efficiency of lead-free perovskite LEDs. For example, by atomic-level regulation and 3D printing resin encapsulation, the luminous efficiency and super stability can be improved. In addition, by introducing antioxidants that form strong interactions with tin (II) iodide in the precursor solution, the rapid aggregation of perovskite clusters during initial crystallization can be effectively suppressed, thus promoting the formation of high-quality Sn-based perovskites and achieving high-efficiency lead-free perovskite LEDs.

4. Environmentally Friendly Lead-Free Perovskite Violet LEDs

A research team from Zhengzhou University prepared an environmentally friendly perovskite violet LED using Cs3Sb2Br9 quantum dot films as the luminescent layer, with a device external quantum efficiency of 0.206%. This progress indicates that lead-free perovskite materials have great potential in achieving high-efficiency, stable, and environmentally friendly light-emitting diodes.

5. Conclusion and Outlook

The research on lead-free perovskite light-emitting diodes is rapidly developing, with new discoveries and breakthroughs emerging continuously. With the improvement of efficiency and stability, lead-free perovskite LEDs will play an increasingly important role in future display and lighting technologies. At the same time, in-depth research on lead-free perovskite materials will also promote the development of environmentally friendly optoelectronic devices, providing technical support for achieving sustainable development.

Tags: Lead-Free Perovskite Light-Emitting Diodes

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