Enhanced approach to the local field correction of luminescent materials based on Ln3+ ions

Souza, Adelmo S.; Cortes, G.K.R.; Lima, Heveson; Santos, M.A. Couto dos

doi:10.1016/j.jlumin.2019.02.010

Cited by 4 publications

(1 citation statement)

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“…Além disso, a utilização de ferramentas teóricas para a descrição da luminescência de lantanídeos é extremamente útil para o aprimoramento e adaptação das propriedades observadas. [117][118][119][120][121] O número crescente de aplicações industriais com elementos de terras raras despertou o interesse em novas tecnologias de extração via fontes alternativas. [122][123][124][125][126][127][128] Embora as propriedades luminescentes dos compostos de TR fossem conhecidas desde o final do século XIX e início do século XIX, o primeiro composto usado contendo terras raras foi o vanadato de ítrio dopado com európio(III), emissor vermelho.…”

Section: Aplicaçõesunclassified

Terras Raras: Tabela Periódica, Descobrimento, Exploração No Brasil E Aplicações

2019

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In the ~150 years comprised between the discovery of yttrium (1794) and promethium (1947), the rare earth metals were an incomplete chapter and a stone in the shoe of the periodic classification of the chemical elements. This group of 17 elements with remarkable chemical similarity raised confusion on many brilliant scientists, including Mendeleev, and led to the consolidation of many theories in Chemistry, from atomic spectroscopy to quantum theory. Nowadays we know that the special properties of these elements arise from filling 4f orbitals, which results in unique spectroscopic, magnetic and catalytic behavior. Such properties make rare earths essential elements on optical devices, lasers, telecommunications and magnetic materials for sustainable energy. The importance of rare earths far exceeds the science and technology domains, reaching the same level of other strategic materials for energy and defense. Hence, this work presents a brief discussion about the historical path of the rare earth elements in the Periodic Table and about the exploration of these resources in Brazil, detailing some of the extractive activities since the 19 th century and some perspectives for future activities concerning this group of elements in Brazil.

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Section: Aplicaçõesunclassified

Terras Raras: Tabela Periódica, Descobrimento, Exploração No Brasil E Aplicações

2019

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Modification of the Near‐Infrared Spontaneous Emission in Er³⁺‐Activated Inverse Silica Opals

Chiappini

Armellini

Bazzanella

et al. 2019

Physica Status Solidi (b)

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Ordered SiO2:Er3+ inverse opal films are fabricated by sol–gel technique in combination with a self‐assembly method to examine their potential as a suitable platform to tailor the spontaneous emission lifetime of Er3+ ions and its concentration quenching (CQ). Good ordering on long‐range scale is evidenced by means of scanning electron microscopy, whereas reflectance measurements display a green bright color, as it results from optical Bragg diffraction from the (111) crystal planes. Moreover, it is observed that the spontaneous decay rates (SDRs) of the inverse opals are suppressed, in contrast to the corresponding reference samples, due to the modulation of the effective refractive index (neff), in agreement with the virtual cavity model. At the same time, the reduced CQ of Er3+ is attributed to the periodic empty cavity of the inverse opals. These results demonstrate that inverse opals can provide a tool for the enhancement of near‐infrared (NIR) luminescence.

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The local-field correction factor beyond the Onsager–Böttcher approach: Mixing of states from the interaction with atoms in the surrounding medium

Souza

Cortes

Lima

et al. 2021

Journal of Luminescence

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Enhanced approach to the local field correction of luminescent materials based on Ln3+ ions

Cited by 4 publications

References 19 publications

Terras Raras: Tabela Periódica, Descobrimento, Exploração No Brasil E Aplicações

Terras Raras: Tabela Periódica, Descobrimento, Exploração No Brasil E Aplicações

Modification of the Near‐Infrared Spontaneous Emission in Er³⁺‐Activated Inverse Silica Opals

The local-field correction factor beyond the Onsager–Böttcher approach: Mixing of states from the interaction with atoms in the surrounding medium

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Enhanced approach to the local field correction of luminescent materials based on Ln3+ ions

Cited by 4 publications

References 19 publications

Terras Raras: Tabela Periódica, Descobrimento, Exploração No Brasil E Aplicações

Terras Raras: Tabela Periódica, Descobrimento, Exploração No Brasil E Aplicações

Modification of the Near‐Infrared Spontaneous Emission in Er3+‐Activated Inverse Silica Opals

The local-field correction factor beyond the Onsager–Böttcher approach: Mixing of states from the interaction with atoms in the surrounding medium

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Product

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Modification of the Near‐Infrared Spontaneous Emission in Er³⁺‐Activated Inverse Silica Opals