Dual Emission in the Near-Infrared and Visible Regions from a Mixed Cyanido-Bridged EuIII/NdIII(4-OHpy)-CoIII Layered Material

Konstantinos Karachousos-Spiliotakopoulos; Vassilis Tangoulis; Anastasios Tasiopoulos; Nikos Panagiotou; Elefhteria Charalambous; Vassilis Nastopoulos; Sotirios Christodoulou

doi:10.1021/acs.inorgchem.2c01988

Dual Emission in the Near-Infrared and Visible Regions from a Mixed Cyanido-Bridged Eu^III/Nd^III(4-OHpy)-Co^III Layered Material

Inorg Chem. 2022 Oct 10;61(40):15806-15811. doi: 10.1021/acs.inorgchem.2c01988. Epub 2022 Sep 26.

Authors

Konstantinos Karachousos-Spiliotakopoulos¹, Vassilis Tangoulis¹, Anastasios Tasiopoulos², Nikos Panagiotou², Elefhteria Charalambous^{3

4}, Vassilis Nastopoulos¹, Sotirios Christodoulou³

Affiliations

¹ Department of Chemistry, University of Patras, Patras 26504, Greece.
² Department of Chemistry, University of Cyprus, Nicosia 1678, Cyprus.
³ Inorganic Nanocrystals Laboratory, Department of Chemistry, University of Cyprus, Nicosia 1678, Cyprus.
⁴ Experimental Condensed Matter Physics Laboratory, Department of Physics, University of Cyprus, Nicosia 1678, Cyprus.

Abstract

Coordination polymers (CPs) with a dual emission spanning from the visible (vis) to near-infrared (NIR) regions of the electromagnetic spectrum are used for optical sensors, medical diagnostics, and telecommunication technologies. We herein report the synthesis, structural characterization, and optical response of heterometallic cyanido-bridged layered {[Eu_xNd_y(4-OHpy)₂(H₂O)₃][Co(CN)₆]} CPs, where 4-OHpy = 4-hydroxypyridine, with a multicolor emission profile across the vis and NIR regions. The crystals show an efficient energy transfer (ET) from the 4-OHpy ligand and the [Co(CN)₆] ions to the Eu³⁺ and Nd³⁺ ions, resulting in an enhanced photoluminescence (PL) efficiency. We study the ET with steady-state and time-resolved PL, reporting an ET between the Ln³⁺ centers. The excitation-dependent emission of the mixed Ln³⁺ CPs and the control over the PL lifetime yield new insights into the optoelectronic properties of these materials.