Dual visible and near-infrared luminescence in mononuclear macrocyclic erbium((III)) complexes( )via( )ligand and metal centred excitation

Author(s)

Gil, Yolimar ; de Santana, Ricardo Costa ; de Camargo, Andrea Simone Stucchi ; Merizio, Leonnam Gotardo ; Carreno, Patricia Farias ; Fuentealba, Pablo ; Manzur, Jorge ; Spodine, Evgenia

• Document type: Journal article
• Source: DALTON TRANSACTIONS; v. 52, n. 10, p. 11-pg., 2023-02-07.

Abstract

Considering the structural design of some of the scarce molecular-based Er-centred emitters in the literature, we explored the optical properties of three Er-III hexaazamacrocyclic complexes, namely Er-EDA (1), Er-OPDA(2) and Er-DAP(3). The macrocyclic ligands in these complexes differ in the lateral spacers, and are derived from 2,6-pyridine-dicarbaldehyde and ethylenediamine (EDA), ortho-phenylenediamine (OPDA) or 1,3-diaminopropane (DAP). Upon ligand-centred excitation, the bluish-green and green emissions of the Er-III ion were detected only for the complexes containing macrocycles with aliphatic spacers (1 and 3), which evidenced that these ligands can sensitize the Er-III luminescence. On the other hand, the ligand derived from the aromatic diamine (2) does not sensitize the Er-III luminescence. Energy transfer mechanisms, temperature sensing, CIE coordinates and CCT values were analyzed. Besides the excitation in the ligands, the erbium-centred excitation at 980 nm allowed the detection, in all cases, of bluish-green, green and red up-converted emissions, and also the downshifted NIR emission. The possible mechanisms involved in these transitions were described and analyzed according to the available data. (AU)

• FAPESP's process: 13/07793-6 - CEPIV - Center for Teaching, Research and Innovation in Glass
• Grantee: Edgar Dutra Zanotto
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC
• FAPESP's process: 19/21770-5 - Luminescent materials incorporated to glasses: new composites for application in safety lighting and radiation detection
• Grantee: Leonnam Gotardo Merizio
• Support Opportunities: Scholarships in Brazil - Post-Doctoral