Abstract
Fluorescent nanoparticles have an important role in biological analyzes, and in the last ten years they are successfully applied in a visualization and characterization of biological processes at the cellular and molecular level, as well as, in the development of fluorescent lamps, displays, plasma screens and protective labels. The great interest is directed towards the development and implementation of the light up - converters containing rare earth ions which have the ability of a intense luminescence. In this paper we described the process of EDTA assisted hydrothermal synthesis of rare earth doped fluorides. Different structural forms of materials were obtained by changing the time of the hydrothermal reaction. Comparison of a structure, morphology and optical properties of NaYF4:Yb3+/Er3+ powders were done based on X-ray powder diffraction analysis (XRPD), scanning and transmission electron microscopy (SEM and TEM) and through measuring of the luminescence in a visible part of spectrum. It was shown that the transformation from cubic to hexagonal phase is affected by the reaction time, while the up - conversion luminescence is dependent of the particles morphology and the crystal structure.
Highlights
Sinteza „up“ – konvertujućih NaYF4:Yb3+/Er3+ nano i mikročestica vršena je hidrotermalnim postupkom pri koncentraciji RE3+ jona od 100 mmol i koncentraciji dopanata od 20 mol%, uz dodatak NaF u višku (F-:RE3+= 7:1) i odnosu etilendiamintetrasirćetne kiseline (EDTA): RE3+=4, u trajanju 0.5 i 2 h
Dobijeni rastvor je uz mešanje zagrevan do 60 oC u trajanju od 15 min, a zatim prebačen u autoklav sa uloškom od teflona radne zapremine 100 ml. pH vrednost je podešena na 3 uz dodatak nekoliko kapi HNO3
It was shown that the transformation from cubic to hexagonal phase is affected by the reaction time, while the up - conversion luminescence is dependent of the particles morphology and the crystal structure
Summary
Sinteza „up“ – konvertujućih NaYF4:Yb3+/Er3+ nano i mikročestica vršena je hidrotermalnim postupkom pri koncentraciji RE3+ jona od 100 mmol i koncentraciji dopanata od 20 mol%, uz dodatak NaF u višku (F-:RE3+= 7:1) i odnosu EDTA: RE3+=4, u trajanju 0.5 i 2 h. Dobijeni rastvor je uz mešanje zagrevan do 60 oC u trajanju od 15 min, a zatim prebačen u autoklav sa uloškom od teflona radne zapremine 100 ml (punjenje reaktora 80 %). Autoklav je zatvoren i rastvor je polako zagrevan do 200 oC uz konstantno mešanje (100 rpm). Nakon sušenja na 100 oC (3h), dobijeni uzorci su termički tretirani žarenjem u argonu na 500 oC (4 h). U nastavku teksta termički tretirani prahovi dobijeni hidrotermalnim procesiranjem prekursora u trajanju od 0.5 i 2 h, označeni su kao uzorak 1 i 2, tim redom. LTD) koristeći sistem spektrometara koji obuhvataju optički parametarski oscilirajući izvor pobuđivanja (EKSPLA NT 342, emisionog opsega 210–2300 nm), kriostat (Cryostat Advance Research Systems DE202-AE) sa kontrolorom Lakeshore 331, spektrograf FHR 1000 (Horiba Jobin–Yvon ) i ICCD detektor (Horiba Jobin–Yvon 3771) sa laserskom pobudom od 980 nm
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