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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Effects of the Pechini's modified synthetic route on structural and photophysical properties of Eu3+ or Tb3+-doped LaAlO3

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Garcia, A. B. S. [1, 2, 3] ; Bispo-Jr, A. G. ; Lima, S. A. M. [2] ; Pires, A. M. [1, 2, 3]
Total Authors: 4
[1] Sao Paulo State Univ UNESP, Inst Chem, BR-14800900 Araraquara, SP - Brazil
[2] Sao Paulo State Univ Unesp, Sch Technol & Sci, R Roberto Simonsen 305, BR-19060900 Presidente Prudente, SP - Brazil
[3] Sao Paulo State Univ Unesp, Inst Biosci Humanities & Exact Sci, BR-15054000 Sao Jose Do Rio Preto, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Materials Research Bulletin; v. 143, NOV 2021.
Web of Science Citations: 0

Herein, it is reported the Pechini's synthesis of LaAlO3:Ln(3+) (Ln = Eu3+ or Tb3+) varying doping concentration from 1 to 9 at.% to evaluate its influence on structure and luminescence. Sub-micrometric, high-crystalline and monophasic samples with crystallite size smaller than 61 nm were synthesized with activators replacing slightly distorted LaO12 polyhedra, and occupying two non-equivalent local sites on the surface, and inside them. Upon UV excitation, Eu3+-doped phosphors emit at 620 nm while Tb3+ ones exhibit dominant wavelength within the green spectral region. The excited state lifetimes lie within 2.5-3.4 ms, and as doping percentage increases, luminescence quenching mediated by exchange coupling energy transfer occurs, leading to the 3 and the 7% as the optimal Eu3+ and Tb(3+)concentrations, respectively. Finally, our proposed route increases the Eu3+ D-5(0)-> F-7(2) transition relative intensity, compared with others reported, ensuring that this method brings a breakthrough in the optical performance of LaAlO3-based phosphors. (AU)

FAPESP's process: 19/23763-6 - Triplet state direct excitation on trivalent lanthanide complexes
Grantee:Airton Germano Bispo Júnior
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 17/13688-1 - Lanthanum aluminate in the planning of functionalized luminescent core@shell systems containing the Eu3+ and Tb3+ ions for application in light converting devices
Grantee:Alessandro Bruno Silva Garcia
Support Opportunities: Scholarships in Brazil - Master