On the long decay time of the F-7(5) level of Tb3+

abstract

The Tb3+ F-7(5) level has been shown to play an important role in the energy transfer involving this ion. This is due to the unusually long lifetime of this level which is commonly disregarded when treating energy transfer involving this ion. In this work, we give a rationalized explanation for this phenomenon. It is discussed that the F-7(5) level can be fed by an energy transfer process and the population is trapped due to a low decay rate, which is related to the energy gap to the F-7(6) ground level in the far infrared and the correspondingly low photon density of states. This is in agreement with experimental data from direct measurements of the total decay lifetimes of the F-7(5) level and the emission quantum yields when this level is considered as an energy acceptor in Tb3+ compounds.

keywords

ASSISTED ENERGY-TRANSFER; MULTIPHONON RELAXATION; EXCITED-STATES; LUMINESCENCE; LANTHANIDE; SPECTRA; TRANSITIONS; INTENSITIES; COMPLEXES; MODEL

subject category

Optics

authors

Neto, ANC; Kasprzycka, E; Souza, AS; Gawryszewska, P; Suta, M; Carlos, LD; Malta, OL

our authors

acknowledgements

This work was also developed within the scope of the project CICECO-Aveiro Institute of Materials, UIDB/50011/2020, UIDP/50011/2020 & LA/P/0006/2020, financed by Portuguese funds through the FCT/MEC (PIDDAC) . The support of the European Union?s Horizon 2020 FET Open program under grant agreement No. 801305 (Nano-TBTech) is also acknowledged. The authors are grateful to the Brazilian funding agencies CNPq and FACEPE for financial support.

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