Microwave Synthesis of Blue Emitting Yb,Tm:NaYF4 Nanocrystals: Study of Reaction Parameters
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Microwave Synthesis of Blue Emitting Yb,Tm:NaYF4 Nanocrystals: Study of Reaction ParametersAutoría
Tutor/Supervisor; Universidad.Departamento
Julián López, Beatriz; Universitat Jaume I. Departament de Química Inorgànica i Orgànica; Sancho Llopis, Juan Vicente; Universitat Jaume I. Departament de Química Física i AnalíticaFecha de publicación
2020-06-26Editor
Universitat Jaume IResumen
Up-converting (UC) materials are those materials that can absorb two or more low
energy photons (from near infrared radiation) and convert them into an emission
of higher frequency photons (visible light). These ... [+]
Up-converting (UC) materials are those materials that can absorb two or more low
energy photons (from near infrared radiation) and convert them into an emission
of higher frequency photons (visible light). These systems are very useful in a
plethora of applications such as bioimaging, theragnostic, solar cells, sensors or
anti-counterfeiting technologies. Among them, blue-emitting UC materials have
received more and more attention, since this emission can trigger complex
photochemical processes with special interest in biomedical fields and
photocatalysis.
This work presents the synthesis and hydrophilic surface functionalization of blueemitting Tm3+,Yb3+-doped NaYF4 nanocrystals, as one of the most efficient upconverting material, via an easy and ultra-fast microwave-assisted approach. The
effect of several reaction parameters (i.e., temperature, reaction time and
concentration) on the morphology and crystalline phase (cubic or hexagonal) of
the materials has been studied. In this work, we obtained small ( < 100 nm) and
rounded cubic-phase nanocrystals (kinetic product), and also larger hexagonal
crystals (thermodynamic product) upon different reaction conditions. However, it
was found that the large hexagonal crystals could revert into the cubic phase and
reduce their size through a dissolution-nucleation mechanism because of a
controlled microwave treatment. The optical characterization of the materials was
also conducted and the emission of blue light upon NIR radiation detected. Finally,
the application of these up-converting materials as additives to obtain functional
light-emitting plastic films was assessed. [-]
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Treball Final de Grau en Química. Codi: QU0943. Curs acadèmic: 2019/2020
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info:eu-repo/semantics/bachelorThesisDerechos de acceso
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- Grau en Química [265]