Facile and cost-effective technique to control europium oxidation states in glassy fluorophosphate matrices with tunable photoluminescence

Inorganic fluorophosphate glasses doped with Eu 2 + /Eu 3 + are potential candidates for phosphors for commercial white LEDs. This report presents a fast, inexpensive and effective method of controlling the relative concentrations of Eu 2 + /Eu 3 + photoluminescent centers in these glasses. The tech...

Full description

Saved in:
Bibliographic Details
Published in:Scientific reports 2022-11, Vol.12 (1), p.18774-10, Article 18774
Main Authors: Jarocka, Agata, Fetliński, Bartosz, Dębowski, Paweł, Pietrzak, Tomasz K., Jurak, Kacper, Wasiucionek, Marek
Format: Article
Language:English
Subjects:
639/301/1019
639/624/1075
639/624/399
639/766/400
Atmosphere
Europium
Experimental methods
Humanities and Social Sciences
Luminescence
Melting
multidisciplinary
Photoelectron spectroscopy
Photons
Reagents
Science
Science (multidisciplinary)
Spectroscopy
Spectrum analysis
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Inorganic fluorophosphate glasses doped with Eu 2 + /Eu 3 + are potential candidates for phosphors for commercial white LEDs. This report presents a fast, inexpensive and effective method of controlling the relative concentrations of Eu 2 + /Eu 3 + photoluminescent centers in these glasses. The technique consists of a fast quenching of the melt of initial reagents under appropriate conditions. Eu 2 + /Eu 3 + ratio was controlled by carrying out the melting under a reducing atmosphere at a temperature between 1000 and 1200 ∘ C for periods of 5 to 15 minutes. The reducing atmosphere was provided by a ’double crucible’ technique and did not require special gas lines during the synthesis. The samples were studied by several complementary experimental methods (X-ray diffractometry—XRD, X-ray photoelectron spectroscopy—XPS, photoluminescence—PL—and photoluminescence excitation—PLE—spectroscopies as well as optical transmission spectroscopy). It was shown that the syntheses resulted in amorphous materials with different relative Eu 2 + /Eu 3 + concentration ratios, strongly dependent on the preparation conditions: the temperature and the time of melting in a reducing atmosphere. Moreover, changes in these ratios strongly affected the materials’ PL and PLE spectra. Demonstration of reproducible smooth transition from amaranth to blue luminescence color, with white in between, was the most spectacular result of this work.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-022-21981-z