Abstract

AbstractIn the rapidly developing smart era, near‐infrared luminescent materials have important applications in various fields that are closely related to people. Nag and co‐workers provided a first codoping strategy to achieve efficient near‐infrared photoluminescence in lead‐free double perovskite materials. Through the introduction of Bi3+ ions, a new energy state is formed that leads to the absorption of lower‐energy light. The excited state formed by this light absorption subsequently excites f‐electrons of Er3+ or Yb3+ ions, and the relaxation of these f‐electrons results in near‐infrared photoluminescence. This may open a new chapter in the application of perovskites for infrared detection and human sensing.

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