He explained that replacing the lead element in these materials is a natural first step towards less toxicity. Researchers have chosen various low-toxic elements similar to lead due to their specific properties which contribute to the optical characteristics of perovskite materials. Double perovskites have provided a solution to these issues, and with their high efficiency, strong color rendering, and adjustable luminescence performance, have piqued significant interest in the solid-state lighting field. This provides both a unique challenge and opportunity for the photoelectric industry.
Song mentioned the numerous efforts devoted to the study of these perovskite materials since initial work on it in 2017. An important breakthrough was achieved recently when white light emission with high efficiency was achieved through the simultaneous modification of the material, which marked a significant milestone in the development of these materials. Despite this achievement, there are still ongoing challenges, namely the poor stability and remaining toxicity. However, various attempts to reduce toxicity while retaining efficient optical properties have been made.
The introduction of certain ions decreases the energy needed for excitation, providing a new channel for absorption and increases the rate of energy transfer. The team achieved a high efficiency by adjusting the concentrations of these ions in the perovskite material.
Song explained that as the concentration of ions is increased, the energy transfer rate also generally improves. After extensive testing, they found that the efficiency of the perovskite material greatly improved after the addition of certain ions. A potential mechanism to describe the emission process in the modified perovskite material was proposed, with the ions providing a new absorption channel.
Finally, the team prepared white light emitting diodes based on the ion co-doped perovskite materials. They achieved optimal performance metrics and a decent lifetime for these diodes. Song concluded that this approach of adding optical functions to these materials could lead to future applications in fields such as optical fiber communications, daily lighting, military industry, displays, and more.
Research Report:Eu3+-Bi3+ Codoping Double Perovskites for Single-Component White-Light-Emitting Diodes
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