Banca de DEFESA: MATHEUS SOARES LIMEIRA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : MATHEUS SOARES LIMEIRA
DATE: 12/09/2022
TIME: 09:30
LOCAL: https://meet.google.com/zso-mwiu-cfu
TITLE:

GENERATION OF BLUE AND RED LIGHT IN GLASS MATRICES ZnTe CO-DOPED WITH Mn AND Tm FOR APPLICATION IN PLANT GROWTH

KEY WORDS:

GREENHOUSES; LUMINESCENCE; PLANT-GROWTH; RARE-EARTH

PAGES: 66
BIG AREA: Ciências Exatas e da Terra
AREA: Física
SUBÁREA: Física da Matéria Condensada
SPECIALTY: Prop. Óticas e Espectrosc. da Mat. Condens; Outras Inter. da Mat. com Rad. e Part.
SUMMARY:

In this work, an experimental study of luminescence was carried out in glassy samples doped with rare earth Thulium (Tm) and transition metal Manganese (Mn) pursuing the generation of light in the blue and red region of the light spectrum, between 400nm and 480nm and 620nm and 700nm, respectively, for application in botany, more specifically in “in vivo” plant cultivation. Vitreous samples of zinc telluride (ZnTe) were doped and co-doped with Tm and Mn and synthesized by the melting method. The samples were excited by a laser+fiber system operating at 1064 nm with Stokes and anti-Stokes emission generated by the silica+phosphate fiber (SiO2-GeO2-:P2O5). Eleven samples of ZnTe doped with Tm and codoped with different concentrations of Mn were produced and excited with 1200 nm of the Stokes generation. As a result of the luminescence of the synthesized material, high intensity peaks were seen around 480nm (1G4 → 3H6), 650nm (1G4 → 3H4) and 800nm due to Tm, in addition to low intensity Mn emission around 695nm (2E → 4A2). It was also seen that with the increase in the concentration of Mn there is a decrease in the intensities of the light peaks coming from the Tm transitions and the emergence and growth of a transition at 695nm due to the presence of Mn4+. There is energy transfer between Tm and Mn, but it should be studied later through other techniques of material characterization that were not explored in the in the present study. It was identified that the material studied has great potential for photonic application, taking as a botanical application, the emissions from the studied samples are beneficial for Beta-carotene, Phytochrome (Pr), Phytochrome (Pfr) and Chlorophyll A.

BANKING MEMBERS:
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Interno - 048.326.254-46 - FRANCISCO DE ASSIS MARTINS GOMES REGO FILHO - IFAL
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