Synthesis and characterization of lanthanide complexes with carboxylic acid ligands

• Grant number: 15/03400-5
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: June 01, 2015
• End date: February 28, 2017
• Field of knowledge: Physical Sciences and Mathematics - Chemistry - Inorganic Chemistry
• Principal Investigator: Sergio Antonio Marques de Lima
• Grantee: Felipe da Silva Manrique Canisares
• Host Institution: Faculdade de Ciências e Tecnologia (FCT). Universidade Estadual Paulista (UNESP). Campus de Presidente Prudente. Presidente Prudente , SP, Brazil

Abstract

Lanthanide complexes calls attention of scientific community as an alternative to the expensive iridium (III) complexes used in OLEDs fabrication. These rare earth complexes exhibit excellent emission properties and monochromaticity. Lanthanide ions are good emitters, but have low molar absorption due to its f-f forbidden transition by Laporte selection rule. An alternative used to overcome this deficit is the use of organic ligand with high molar absorption and then transfer its energy efficiently to the lanthanide ions in the so called 'antenna effect'. Lanthanide (III) ions are considered hard acids, by Pearson definition, and then they form stable complexes with hard Lewis bases. Among all different classes of ligands known, carboxylic acids call attention due its chemical and thermal stability, and high triplet energy. Thermal stability is important in the deposition of active layers in OLEDs, and high triplet energy can sensitize several lanthanide ions. So being, in this work we propose the synthesis and characterization of complexes of lanthanides (Eu3+, Tb3+ and Gd3+) with carboxylic acids ligands to use in OLED displays. It is worth to highlight that for the best of our knowledge the proposed complexes are novel structures so far.

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

MUTTI, A. M. G.; CANISARES, F. S. M.; MACHINI, W. B. S.; PIRES, A. M.; TEIXEIRA, M. F. S.; LIMA, S. A. M.. A spectroscopic experimental and semi-empirical study of [Eu (salen)(2)] as a red-emitter for phosphor-converted UV LED. OPTIK, v. 243, OCT 2021. (19/26103-7, 16/09017-1, 15/03400-5)

CANISARES, FELIPE S. M.; BISPO-JR, AIRTON G.; PIRES, ANA M.; LIMA, SERGIO A. M.. Syntheses and characterization of Schiff base ligands and their Ir (III) complexes as coating for phosphor-converted LEDs. OPTIK, v. 219, OCT 2020. (12/13876-9, 15/03400-5, 16/20421-9, 15/10394-1)

CANISARES, FELIPE S. M.; MUTTI, ALESSANDRA M. G.; SANTANA, EDY F.; OLIVEIRA, VYTOR C.; CAVALCANTE, DALITA G. S. M.; JOB, ALDO E.; PIRES, ANA M.; LIMA, SERGIO A. M.. Red-emitting heteroleptic iridium(III) complexes: photophysical and cell labeling study. PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES, v. 21, n. 6, p. 14-pg., 2022-03-18. (15/03400-5, 19/26103-7)