| Texto completo | |
| Autor(es): |
Almeida dos Santos, Danilo Ormeni
[1]
;
Giordano, Luidgi
[1]
;
Stock Grein Barbara, Miguel Aguirre
[1]
;
Portes, Marcelo Cecconi
[1]
;
Santos Pedroso, Cassio Cardoso
[2, 3]
;
Teixeira, Veronica Carvalho
[4]
;
Lastusaari, Mika
[5]
;
Veloso Rodrigues, Lucas Carvalho
[1]
Número total de Autores: 8
|
| Afiliação do(s) autor(es): | [1] Univ Sao Paulo, Dept Fundamental Chem, Inst Chem, BR-05508000 Sao Paulo, SP - Brazil
[2] Univ Sao Paulo, Inst Chem, Dept Biochem, BR-05508000 Sao Paulo, SP - Brazil
[3] Lawrence Berkeley Natl Lab, Mol Foundry, Berkeley, CA 94720 - USA
[4] Brazilian Ctr Res Energy & Mat CNPEM, Brazilian Synchrotron Light Lab LNLS, BR-13083970 Campinas, SP - Brazil
[5] Univ Turku, Dept Chem, FI-20014 Turku - Finland
Número total de Afiliações: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | DALTON TRANSACTIONS; v. 49, n. 45, p. 16386-16393, DEC 7 2020. |
| Citações Web of Science: | 1 |
| Resumo | |
Persistent luminescence materials are a reality in several applications. However, there is still a lack of efficient red-emitting materials. SrS:Eu2+ phosphor is a potential candidate since its strong nephelauxetic effect shifts Eu(2+)4f(6)5d(1) -> 4f(7) to red, and its weak bond between strontium and sulphide, due to the soft base-hard acid character, generates a high number of intrinsic defects. SrS:Eu2+,RE3+ materials were efficiently prepared by two rounds of 22 min microwave-assisted solid-state synthesis. The highly crystalline purity and the material organization at the micro-scale were observed with X-ray powder diffraction and scanning electron microscopy, respectively. X-ray absorption spectroscopy revealed a low amount of Eu2+ compared to Eu3+ due to the efficient Eu2+ photo-oxidation by X-ray irradiation in the high storage capability SrS host matrix. Electron paramagnetic resonance spectra confirmed that at least 50% of Eu2+ ions in the material are photo-oxidized during excitation, reinforcing the previously established mechanisms. The RE2+ energy level positioned very close to or into the conduction band led to an abnormal co-doping effect, with similar effects independent of the co-dopant. The high concentration of intrinsic defects in SrS indicates that the soft-hard pair host is an excellent approach to develop efficient persistent luminescence materials. (AU) | |
| Processo FAPESP: | 17/09774-0 - Geração e detecção de oxigênio singlete em sistemas complexos para estudos de lesões celulares utilizando nanopartículas apresentando upconversion. |
| Beneficiário: | Cássio Cardoso Santos Pedroso |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 13/07937-8 - Redoxoma |
| Beneficiário: | Ohara Augusto |
| Modalidade de apoio: | Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs |
| Processo FAPESP: | 18/05280-5 - Materiais fotônicos ativos no vermelho-infravermelho para conversão e armazenamento de energia |
| Beneficiário: | Lucas Carvalho Veloso Rodrigues |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |