Boosting Near-Infrared Luminescence of Lanthanide in Cs2 AgBiCl6 Double Perovskites via Breakdown of the Local Site Symmetry

Yifan Pei; Datao Tu; Chenliang Li; Siyuan Han; Zhi Xie; Fei Wen; Luping Wang; Xueyuan Chen

doi:10.1002/anie.202205276

Boosting Near-Infrared Luminescence of Lanthanide in Cs₂ AgBiCl₆ Double Perovskites via Breakdown of the Local Site Symmetry

Angew Chem Int Ed Engl. 2022 Jul 25;61(30):e202205276. doi: 10.1002/anie.202205276. Epub 2022 Jun 8.

Authors

Yifan Pei^{1

2}, Datao Tu^{1

2

3}, Chenliang Li¹, Siyuan Han¹, Zhi Xie⁴, Fei Wen^{1

2}, Luping Wang¹, Xueyuan Chen^{1

2

3}

Affiliations

¹ CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China.
² College of Chemistry and Materials Science, Fujian Normal University, Fuzhou, Fujian, 350117, China.
³ Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou, Fujian, 350108, China.
⁴ College of Mechanical and Electronic Engineering, Fujian Agriculture and Forestry University, Fuzhou, Fujian, 350002, China.

PMID: 35592999
DOI: 10.1002/anie.202205276

Abstract

Currently, lanthanide (Ln³⁺ )-doped near-infrared (NIR)-emitting double perovskites (DPs) suffer from low photoluminescence quantum yield (PLQY). Herein, we develop a new class of NIR-emitting DPs based on Ln³⁺ -doped Cs₂ (Na/Ag)BiCl₆ . Benefiting from the Na⁺ -induced breakdown of local site symmetry in the Cs₂ AgBiCl₆ DPs, effective NIR emissions of Ln³⁺ are realized through Bi³⁺ sensitization. Specifically, 7.3-fold and 362.9-fold enhanced NIR emissions of Yb³⁺ and Er³⁺ are achieved in Cs₂ Ag_0.2 Na_0.8 BiCl₆ DPs relative to those in Na-free Cs₂ AgBiCl₆ counterparts, respectively. The optimal absolute NIR PLQYs for Yb³⁺ and Er³⁺ in Cs₂ Ag_0.2 Na_0.8 BiCl₆ DPs are determined to be 19.0 % and 4.3 %, respectively. Raman spectroscopy and first-principles density functional theory calculations verify the sublattice distortion in Cs₂ (Na/Ag)BiCl₆ DPs via Na⁺ doping. These findings provide fundamental insights into the design of efficient NIR-emitting Ln³⁺ -doped DPs for versatile optoelectronic applications.

Keywords: Cs2AgBiCl6; Double Perovskites; Lanthanide Ions; Local Site Symmetry; Near-Infrared Luminescence.

Abstract

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