Room temperature synthesis of β-NaGdF4: RE3+ (RE = Eu, Er) nanocrystallites and their luminescence

Tessitore, Gabriella; Mudring, A.-V.; Krämer, Karl (2017). Room temperature synthesis of β-NaGdF4: RE3+ (RE = Eu, Er) nanocrystallites and their luminescence. Journal of luminescence, 189, pp. 91-98. Elsevier 10.1016/j.jlumin.2017.03.021

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A roomtemperaturesynthesiswasdevelopedforphasepure β-NaGdF4 nanocrystallitesaswellas5,10, and 20%Eu3þ or 5%Er3þ doped material.RareearthacetatesandNaClreactina1:2Mratiowitha variableexcessofNH4F inethyleneglycolwithin24hours.Sincethethermodynamicstabilityofthe hexagonalphasedecreasesalongthelanthanideseries,alargerexcessofNH4F wasrequiredforthe synthesis ofluminescentsamplesdopedwiththesmallerEr3þ ions thanforEu3þ doped orpure β- NaGdF4. ThematerialswerecharacterizedbypowderX-raydiffraction,electronmicroscopy,andlumi- nescence spectroscopy.TheEu3þ-doped samplesshow 5D0-7FJ and 5D1-7FJ luminescence afterEu3þ excitationat394nmorGd3þ excitationat273nmand308nm.Theratioof 5D1 vs. 5D0 luminescence is influenced bytheexcitationwavelengthandtheEu3þ concentration. TheEr3þ-doped samplesshow green andredupconversionluminescence,respectively,fromthe 2H11/2þ4S3/2-4I15/2 and 4F9/2-4I15/2 transitions after970nmexcitation.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Departement of Chemistry and Biochemistry

UniBE Contributor:

Tessitore, Gabriella and Krämer, Karl

Subjects:

500 Science > 540 Chemistry

ISSN:

0022-2313

Publisher:

Elsevier

Funders:

[103] European Commission FP7

Language:

English

Submitter:

Karl Krämer

Date Deposited:

29 Nov 2017 12:35

Last Modified:

04 Nov 2019 06:17

Publisher DOI:

10.1016/j.jlumin.2017.03.021

BORIS DOI:

10.7892/boris.107311

URI:

https://boris.unibe.ch/id/eprint/107311

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