JUDD-OFELT ANALYSIS OF Tb3+ AND UPCONVERSION STUDY IN Yb3+-Tb3+ CO-DOPED CALIBO GLASSES
We report on the study of the spectroscopic properties in Ytterbium-Terbium (Yb3+-Tb3+) co-doped calcium lithium borate (CaLiBO) glasses, with the study’s focus being on the upconversion process. Intensity parameters Ωλ for CaLiBO:Tb3+ are determined by the Judd-Ofelt method to be Ω2 = 15.5 × 10-20 cm2, Ω4 = 1.90 × 10-20 cm2 and Ω6 = 3.69 × 10-20 cm2. We have also obtained electric-dipole (and magnetic-dipole) radiative transition probabilities, branching ratios, and lifetime for the Tb3+:5D4 and 5D3 levels. In addition, an evaluation of the upconversion processes by luminescence and time-resolved spectroscopy were carried out. The upconversion rise and decay times, energy transfer probability from Yb3+ to Tb3+ ions, and the efficiency of the processes that depopulate the Tb3+:5D4 level after resonantly pumping the Yb3+:2F5/2 level were estimated. Our results showed that a cooperative energy transfer (CET) from two Yb3+ ions to one Tb3+ ion is the origin of the Tb3+ upconversion luminescence in the visible region. While, CET followed of the cross relaxation or/and excited state absorption is responsible for the upconversion luminescence in the ultraviolet region.
Main Authors: | Terra,Idelma A. A., Borrero-González,Luis J., Almeida,Juliana M. P., Hernandes,Antonio C., Nunes,Luiz A. O. |
---|---|
Format: | Digital revista |
Language: | English |
Published: |
Sociedade Brasileira de Química
2020
|
Online Access: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422020000200188 |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Similar Items
-
Optical properties and Judd-Ofelt intensity parameters of Eu3+ in PMMA: PAAc copolymer samples
by: Sosa F.,R., et al.
Published: (2003) -
Effects of Heat Treatment and Yb 3+ Concentration on the Downconversion Emission of Er 3+ /Yb 3+ Co-Doped Transparent Silicate Glass-Ceramics
by: Dan,Ho Kim, et al.
Published: (2019) -
Preparation and study of the titanium oxide thin films doped with Tb3+ and Ce3+ ions
by: Molina,E.F., et al.
Published: (2012) -
Thermal effects on light emission in Yb3+-sensitized rare-earth doped optical glasses
by: Gouveia,E. A., et al.
Published: (2001) -
Blue cooperative emission in Yb3+ - doped GeO2 - PbO glasses
by: Del Cacho,Vanessa Duarte, et al.
Published: (2006)