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Photophysical properties of lanthanide charge transfer complexes with organic semiconductors for applications in OLEDs

Grant number: 22/12709-3
Support Opportunities:Scholarships in Brazil - Post-Doctoral
Effective date (Start): December 01, 2022
Effective date (End): November 30, 2024
Field of knowledge:Physical Sciences and Mathematics - Chemistry - Physical-Chemistry
Principal Investigator:Rômulo Augusto Ando
Grantee:Israel Ferreira da Costa
Host Institution: Instituto de Química (IQ). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Associated research grant:22/11983-4 - Spectroscopy signal enhancement: nanomaterials, theory, and computer simulation, AP.TEM

Abstract

The development of new luminescent materials that present synergism with high charge mobility and emission efficiency is relevant for advancing new technologies to produce efficient optoelectronic devices. This proposal intends to develop organic light-emitting devices (OLEDs), exploring the photoluminescence and electroluminescent properties of the lanthanide (Ln3+) complexes. In this vein, aliphatic ²-diketonates and cyclic 1,3-indandionates containing organic semiconductor units such as pyrene and carbazole will be investigated, acting as acceptor and donor groups, respectively. A thorough understanding of the charge transfer process in these different ligands will optimize the energy transfer processes in the lanthanide complexes (Ln: Nd3+, Sm3+, Eu3+, Gd3+, Tb3+, and Yb3+). Our approach will involve the study of photoluminescence and electronic properties using vibrational spectroscopy (FTIR, Raman, and Resonant Raman). In this sense, the nature of the photoinduced charge transfer states of the ligands will be investigated, in addition to the standard techniques, by resonant Raman spectroscopy and by calculations based on the Density Functional Theory (DFT and TD-DFT). Finally, the photoluminescent properties of the respective lanthanide complexes will be investigated from the quantum yield of emission (Q_Ln^L) and experimental and theoretical intensity parameters (W2,4). The electroluminescent (EL) devices will be fabricated using thermal deposition and spin coating methods. The OLED performance will be evaluated based on the current density curves (mA·cm-2) against applied voltage (V), Luminance (cd·m2), Power (W), and EL efficiency (cd·A-1).

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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)
PAOLINI, TIAGO B.; ASSUNCAO, ISRAEL P.; COSTA, ISRAEL F.; BLOIS, LUCCA; FELINTO, MARIA CLAUDIA F. C.; MOURA JR, RENALDO T.; TEOTONIO, ERCULES E. S.; MALTA, OSCAR L.; NETO, ALBANO N. CARNEIRO; BRITO, HERMI F.. The influence of imidazolium counterions on the luminescence properties of Cnmim[Eu(tta)4] tetrakis complexes in solid-state and ionic liquid solutions. Journal of Luminescence, v. 263, p. 11-pg., . (21/08111-2, 22/12709-3)

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