Lattice‐Engineered Lanthanide Nanocrystals with Tunable Near‐Infrared‐IIb Lifetime

作者：Feng Ren, Feng Wu, Sisi Ling, Yejun Zhang, Chunyan Li, Jiang Jiang, Hongchao Yang, Qiangbin Wang · 发表于：Angewandte Chemie International Edition · 年份：2025 · DOI：10.1002/anie.202513988 · 被引用次数：12 · 研究领域：Luminescence Properties of Advanced Materials、Quantum Dots Synthesis And Properties、Perovskite Materials and Applications

Abstract Lattice engineering in lanthanide nanocrystals (LnNCs) is fundamental for tailoring their versatile optical properties, yet it remains underexplored in manipulating the downconversion characteristics. Here, we engineer the lattices from distorted to strain‐graded in LnNCs by CaF 2 deposition on vacancy‐controlled β‐Na x GdF 3+x :Yb,A (A = Tm/Er, x = 0.5, 0.75, 1) NCs. We demonstrate that strain‐graded lattices with high phonon energy enhance the multi‐phonon orbit‐lattice relaxation (MPR) in the downconversion process more effectively than distorted lattices, which helps to extend the near‐infrared‐IIb (NIR‐IIb, 1500–1700 nm) lifetime of Er 3+ /Tm 3+ by 2∼4 times. Subsequent epitaxial CaF 2 growth further attenuates surface phonon coupling, enabling exponential tunability of NIR‐IIb lifetime (Tm 3+ : 0.74∼6.28 ms; Er 3+ : 0.055∼9.2 ms). Finally, we showcase the potential of these LnNCs in time‐resolved multiplexed bioimaging.