Publikace detail

Red upconversion emission of nanocrystalline Er3 -doped Yb3Ga5O12 prepared by sol-gel combustion synthesis,

Autoři: Netolický Tomáš | Wágner Tomáš | Střižík Lukáš | Melánová Klára | Šlang Stanislav

Rok: 2021

Druh publikace: ostatní - článek ve sborníku

Název zdroje: 26. ročník odborného semináře doktorandů Anorganické nekovové materiály ANM 2021 : sborník abstraktů

Název nakladatele: Vysoká škola chemicko-technologická v Praze

Místo vydání: Praha

Strana od-do: nestránkováno

Tituly:

Jazyk	Název	Abstrakt	Klíčová slova
eng	Red upconversion emission of nanocrystalline Er3 -doped Yb3Ga5O12 prepared by sol-gel combustion synthesis,	Nanocrystalline oxide of composition Yb3Ga5O12 belongs to the family of materials with garnet-related structure. It is a promising material with potential applications in the field of photonics when doped by lanthanides such as Er. Such a doped material can provide both Stokes and anti-Stokes emission under suitable excitation. The anti-Stokes emission includes upconversion, which is a nonlinear process where two or more photons are sequentially absorbed and transferred to one photon with higher energy. In Er3+-doped Yb3Ga5O12 the Yb3+ ions operate as sensitizers. These ions absorb excitation energy and transfer it to Er3+ ions operating here as activators (emitting light). One aim of this work is the synthesis of this material with various Er3+ concentration by sol-gel combustion method using citric acid as chelating agent. Phase composition and morphology of annealed products are examined by X-ray diffraction and by scanning electron microscopy. The next aim is focused on optical properties of prepared nanocrystalline powders. Diffuse reflectance spectroscopy is used for determination of absorption bands associated with the presence of Er3+ and Yb3+. Absorption bands of Yb3+ around 980 nm are then used for energy transfer to Er3+. This leads to the visible upconversion emission measured by photoluminescence spectroscopy.

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