Resonance in Er3+ Upconversion Excitation

Krämer, Karl (2017). Resonance in Er3+ Upconversion Excitation. Journal of luminescence, 189, pp. 78-83. Elsevier 10.1016/j.jlumin.2016.11.056

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Upconversion(UC)processesarediscussedontheexamplesofexcitedstateabsorption(ESA)inLaCl3: 1% Er3þ for 980nmexcitationandenergytransferupconversion(ETU)in β-NaYF4: 20%Er3þ for 1523nm excitation.Thecrucialimportanceofresonanceisdemonstratedforone-andtwo-colorexcitationsin LaCl3:Er.ForESAtheexcitationspectraareconvolutionsoftheindividualexcitationstepsandtheUC luminescence intensityshowsalineardependenceontheexcitationpowerforeachstep.Forone-color excitedESAandETUinthelowpowerlimit,theexponentofthepowerdependenceisequaltothe number ofexcitationsteps.Theexponentisreducedduetosaturationeffectsforhighpowerexcitation. The ETUexcitationspectraresemblethegroundstateabsorptionasshownfor β-NaYF4:Er.Uponbroad- band excitationbysub-Si-band-gapinfraredlight β-NaYF4:Er showsUCluminescencemainlyfromthe 4I11/2 state around980nmwhichefficiently excitesaSisolarcell.ThisErUCluminescenceistwoorders of magnitudemoreintensethanthatofotherrareearthionsunderthesameexperimentalconditions.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Departement of Chemistry and Biochemistry

UniBE Contributor:

Krämer, Karl

Subjects:

500 Science > 540 Chemistry

ISSN:

0022-2313

Publisher:

Elsevier

Funders:

[42] Schweizerischer Nationalfonds
[103] European Commission FP7

Language:

English

Submitter:

Karl Krämer

Date Deposited:

29 Nov 2017 11:04

Last Modified:

23 Oct 2019 11:18

Publisher DOI:

10.1016/j.jlumin.2016.11.056

BORIS DOI:

10.7892/boris.107305

URI:

https://boris.unibe.ch/id/eprint/107305

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