Upconversion luminescence of Yb3+: Tm3+ and Yb3+: Tm3+: Er3+- doped Beta-Tricalcium Phosphate nanoparticles
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2017
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INTERNATIONAL CONFERENCE ON LUMINESCENCE, 18th
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Resumo
A novel class of fluorescence nanoparticles of 5.5 mol% of Yb3+, 0.5 mol% of Er3+ and
0.5 mol% Tm3+: calcium deficient hydroxyapatite were synthesized by co-precipitation
method in aqueous solution (pH adjusted to 6) and specially treated with microwave radiation
at 1000°C for 10 minutes to produce nanocrystals of Yb:Tm: and Yb:Tm:Er:-tricalcium
phosphate (-TCP). As a result, we report for the first time, a single-phase -TCP:Yb:Tm:Er
and -TCP:Yb:Tm exhibiting an efficient visible and near infrared upconversion
luminescence from the 1G4 (blue emission), 4S3/2 (green emission), 3F2 (red emission) and 3H4
(near infrared emission) induced by the Yb3+ Tm3+ / Er3+ energy transfer under pulsed laser
excitation at 972 nm (Yb3+) with an average energy of 11 mJ. The emission decay curves of
the upconversion transients, from 1G4 excited state of Tm3+ and 4S3/2 excited level of Er3+,
indicate that ESA process occurs in -TCP:Yb/Tm/Er nanopowder measured for the 550 nm
luminescence of Er3+, which has a time constant (t2) of 0.4 s. However, Yb3+ Tm3+
upconversion (Up2) has a time constant (t2) of 14.4 s and does not exhibit ESA absorption. This -TCP activated by Yb3+ and Tm3+ ions constitutes a new nanobiomaterial that
can be used as diagnostic and therapeutic agents, affording deeper tissue penetration and
higher resolution and sensitivity for visible-near infrared bioimaging and treatments.
Como referenciar
SILVA, F.R.O.; LIMA, N.B.; BRESSIANI, A.H.A.; GOMES, L. Upconversion luminescence of Yb3+: Tm3+ and Yb3+: Tm3+: Er3+- doped Beta-Tricalcium Phosphate nanoparticles. In: INTERNATIONAL CONFERENCE ON LUMINESCENCE, 18th, August 27 - September 01, 2017, João Pessoa, PB. Abstract... p. 336-336. Disponível em: http://repositorio.ipen.br/handle/123456789/28690. Acesso em: 05 Feb 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.