To Dope Mo³⁺ in Colloidal Nanocrystals.

Authors

Manmayuri Sarma, Barnali Mondal, Kingshuk Mukhuti, Yuttapoom Puttisong, Angshuman Nag

Published in

Angewandte Chemie (International ed. in English). Pages e6045865. Sep 14, 2026. Epub Sep 14, 2026.

Abstract

Mo³⁺ shows intra-configurational spin-flip (ICSF) d → d electronic transitions, emitting near-infrared-II (NIR-II) radiation. Till date, the emission has been reported from Mo³⁺-doped into bulk host materials, in the powder or single crystalline forms. Here we report the synthesis of Mo³⁺ doping in a colloidal nanocrystal (NC). Colloidal Mo³⁺-doped Cs₂AgInCl₆ double perovskite NCs are prepared using a typical hot-injection method in a non-polar medium. The challenges of poor solubility of molybdenum precursor and instability of low oxidation state of Mo³⁺ in the reaction medium are overcome by a rational design of the synthesis. The resulting NCs have cubic shape with edge length ∼9 nm, and oleylammonium ions as the predominant surface capping ligands. The colloidal synthesis enabled us to fabricate thin films of Mo³⁺-doped NCs by spin-coating technique. Both colloidal NCs and their films show the sharp Mo³⁺ ICSF NIR-II emission around 1105 nm. Temperature dependent (7-300 K) PL spectra and lifetime studies provide mechanistic insights about the spin- and Laporte-selection rules of the ICSF emission from [MoCl₆]^3- octahedral unit. This report of a colloidal NC with Mo³⁺ dopants, and their thin films, is expected to open up research avenues for micro-LEDs and quantum light emitters in NIR-II region.

PMID:
42733959
Bibliographic data and abstract were imported from PubMed on 14 Sep 2026.

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