All-Inorganic Rare-Earth-Based Double Perovskite Nanocrystals with Near-Infrared Emission,Laser & Photonics Reviews

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All-Inorganic Rare-Earth-Based Double Perovskite Nanocrystals with Near-Infrared Emission
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2021-08-27 , DOI: 10.1002/lpor.202100218
Ruixiang Wu ₁ , Peigeng Han _{2,

3} , Daoyuan Zheng ₂ , Junfeng Zhang ₁ , Songqiu Yang ₄ , Yang Zhao ₅ , Xiangyang Miao ₁ , Keli Han _{2,

4}

Affiliation

Lead-free halide perovskite nanocrystals (NCs) with the unique optical properties are of interest for broad applications. There are a few studies on near-infrared (NIR) emission in perovskite NCs. Here, all-inorganic rare-earth-based Cs₂NaEr₁₋_xB_xCl₆ (B: In, Sb, or Bi; x = 0, 0.13, and 0.5) double perovskite (DP) NCs have been successfully sythesized. The Cs₂NaErCl₆ NCs show good air stability and emit a sharp NIR photoluminescence (PL) at telecommunication wavelength of 1543 nm, originating from ⁴I_13/2→⁴I_15/2 transition of the Er³⁺, and its average lifetime is 35.7 µs. Especially for Cs₂NaEr_0.5Sb_0.5Cl₆ NCs, NIR PL can be enhanced 23-fold with the lifetime being 119.1 µs. Moreover, femtosecond transient absorption measurements prove that a long-lifetime trap state promotes NIR emitting in the mixed Sb/Er DP NCs.

中文翻译：

具有近红外发射的全无机稀土基双钙钛矿纳米晶体

具有独特光学特性的无铅卤化物钙钛矿纳米晶体 (NCs) 具有广泛的应用前景。有一些关于钙钛矿 NC 中近红外 (NIR) 发射的研究。在这里，全无机稀土基 Cs ₂ NaEr ₁₋_x B _x Cl ₆（B：In、Sb 或 Bi；x = 0、0.13和 0.5）双钙钛矿 (DP) NC 已成功合成。Cs ₂ NaErCl ₆ NCs 显示出良好的空气稳定性，并在 1543 nm 的电信波长处发出尖锐的 NIR 光致发光 (PL)，源自Er 的⁴ I _13/2 → ⁴ I _15/2跃迁³⁺，其平均寿命为 35.7 µs。特别是对于 Cs ₂ NaEr _0.5 Sb _0.5 Cl ₆ NCs，NIR PL 可以提高 23 倍，寿命为 119.1 µs。此外，飞秒瞬态吸收测量证明长寿命陷阱状态促进了混合 Sb/Er DP NC 中的 NIR 发射。

更新日期：2021-08-27

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