Project Title:
Transition Metal
Assisted UP Conversion in Lanthanide doped (nano)particles:
Resolving the
mechanisms in spectral and temporal
domains
Project Code:
PN-III-P4-ID-PCE-2020-1553
Contract Nr. :
62/2021
Project Funded by: UEFISCDI, Ministry of Education, Research, Youth and Sport, Romania
Period:
2021 -
2023
Project
Leader: Carmen
TISEANU
Contract
Value: 1
198 032 RON
Project Summary
Our primary goal
is to develop a unitary description of transition metal
(TM: Mo anion, bivalent Mn) assisted lanthanide (Ln:
Yb/Er, Yb/Tm, Gd) upconversion (UPC) emission in both
spectral and temporal domains. Three relevant classes of
materials are selected: rare-earth based oxides, where Mo
is employed as both dopant and host cation (I), and
Rare-Earth fluorides with hexagonal/cubic (II) and
tetragonal (III) lattice structures, where Mn is employed
as dopant. The questions we address in this proposal are:
How the low solubility and heterovalency of transition
metals impact on the local structure, and hence d-d (Mn)
and f-f absorption/emission transitions of Ln? How does
spectral selective and time-resolved/gated excitation
influences the different roles (sensitizer, activator,
mediator) played by TM/Ln in UPC processes with impact on
the emission colour, intensity and dynamics? To what
extent the complex picture of UPC processes includes (if
at all) the Yb - Mo/Mn dimer mechanism? We seek answers to
all these questions using a battery of spectral and
temporal resolved luminescence approaches: investigation
and analysis of site selective, time-resolved emission and
excitation spectra monitoring all key absorption/emission
levels involved in UPC, emission decays and energy density
dependencies by using unique configuration based on
tunable pulsed excitation laser with controlled beam
profile.
Project Objectives:
Our primary goal is to develop a unitary description of
transition metal (TM: Mo anion, bivalent Mn) assisted
lanthanide (Ln: Yb/Er, Yb/Tm, Gd) upconversion (UPC)
emission in both spectral and temporal domains. Three
relevant classes of materials are selected: rare-earth
based oxides, where Mo is employed as both dopant and host
cation (I), and Rare-Earth fluorides with hexagonal/cubic
(II) and tetragonal (III) lattice structures, where Mn is
employed as dopant.
Project Team:
-
Carmen TISEANU (Project Leader)
-
Andrei PATRASCU (Phd Student)
- Ioana POROSNICU (Phd Student)
1. D. Avram, A. A. Patrascu, I. Porosnicu, C. Tiseanu "Emission colour tuning of Mn, Yb, Er-NaGdF4 upconverting nanoparticles by energy density variation and pulse modulation" Optical Materials Express, (2022) 12(5), 1894-1906
2. D. Avram, C. Colbea, A. A. Patrascu, M. C. Istrate, V. Teodorescu, C. Tiseanu "Up-conversion emission in transition metal and lanthanide co-doped systems: dimer sensitization revisited" Scientific Reports, (2023), 13(1), 2165
3. D. Avram, C. Colbea, C. Tiseanu "Heterogeneity effects of Tm upconversion emission in Mo, Tm codoped rare-earth garnets" Journal of Alloys and Compounds, (2023), 944, 169226.
4. D. Avram, A. A. Patrascu, M. C. Istrate, C. Tiseanu "Gd-Er interaction promotes NaGdF4: Yb, Er as a new candidate for high-power density applications" Journal of Materials Chemistry C (2023), Advance Article.
International Conferences
1.
D. Avram, C. Colbea, C. Tiseanu "Local symmetry effects on
the upconversion emission intensity, shape and mechanisms
under pulsed excitation" UPCONline
2021, 06 - 09 april 2021, Online Conference. (Oral presentation)
2. Daniel Avram,
Claudiu Colbea, Andrei A. Patrascu și Carmen Tiseanu
"Upconversion emission properties in transition metal,
lanthanide co-doped systems: a spectral selective,
time-resolved investigation", Spectral sHapIng For
biomedical and energy applicaTions International
Conference (SHIFT
2022) 10-14.10.2022, La Laguna, Spania (Oral
presentation)
Project Acquisitions
Tunable OPO laser (410 - 2500 nm) - Opotek RADIANT QX4130
Detaliile proiectului in limba romana (RO)
Titlul Proiectului:
Conversia
superioara a emisiei lantanidelor asistata de metale
tranziționale: Elucidarea
mecanismelor in domeniul spectral
si temporal (TUPLAN)
Codul Proiectului:
PN-III-P4-ID-PCE-2020-1553
Nr. Contractului:
62/2021
Agentia Finantatoare: UEFISCDI, Ministry of Education, Research, Youth and Sport, Romania
Durata:
2021 - 2023
Director
de Proiect:
Carmen TISEANU
Valoarea
totala:
1 198
032 RON
Abstract
Scopul principal
al proiectului este de a descrie, in mod unitar,
mecanismele de conversie superioară (UPC) a emisiei
lantanidelor (Ln: Yb/Er, Yb/Tm, Gd) asistate de metale
tranziționale (TM: Mo (anion), Mn divalent), in domeniul
spectral si temporal. Am selectat trei clase semnificative
de materiale: oxizi de pămānturi rare, in care Mo joaca
rol de dopant dar si de cation (I), si fluoruri de
pămānturi rare cu structura hexagonală/cubică (II) și
tetragonală (III) in care Mn este utilizat ca dopant.
Īntrebările pe care ni le adresăm īn cadrul acestui
proiect sunt următoarele: Cum influențează solubilitatea
scăzută și heterovalența TM structura locală, și prin
urmare, tranzițiile de absorbție/emisie d-d (Mn) și f-f
ale Ln? Cum influențează excitarea selectivă, rezolvată
temporal rolurile (sensibilizator, activator, mediator)
jucate de TM/Ln īn procesele de UPC si impactul asupra
culorii emisiei, intensității și dinamicii? Īn ce măsură
imaginea complexă a proceselor UPC include mecanismul tip
dimer Yb - Mo/Mn? Căutăm răspunsuri la toate aceste
īntrebări utilizānd o gamă largă de metodici pentru
rezolvarea spectrala si temporala a luminescentei:
investigarea și analiza spectrelor de emisie și excitație
rezolvate temporal cu excitare selectiva monitorizānd
nivelele cheie de absorbție/emisie implicate īn UPC,
cinetica emisiei și dependența emisiei UPC de densitatea
de energie, folosind o configurație unică bazată pe un
laser pulsat tunabil cu profil bine definit.
Obiectivele Proiectului:
Scopul principal al proiectului este de a descrie, in mod
unitar, mecanismele de conversie superioară (UPC) a
emisiei lantanidelor (Ln: Yb/Er, Yb/Tm, Gd) asistate de
metale tranziționale (TM: Mo (anion), Mn divalent), in
domeniul spectral si temporal. Am selectat trei clase
semnificative de materiale: oxizi de pămānturi rare, in
care Mo joaca rol de dopant dar si de cation (I), si
fluoruri de pămānturi rare cu structura hexagonală/cubică
(II) și tetragonală (III) in care Mn este utilizat ca
dopant.
Echipa Proiectlui:
-
Carmen TISEANU (Director de proiect)
-
Andrei PATRASCU
- Ioana POROSNICU
Articole publicate in reviste cotate ISI
2. D. Avram, C. Colbea, A. A. Patrascu, M. C. Istrate, V. Teodorescu, C. Tiseanu "Up-conversion emission in transition metal and lanthanide co-doped systems: dimer sensitization revisited" Scientific Reports, (2023), 13(1), 2165
3. D. Avram, C. Colbea, C. Tiseanu "Heterogeneity effects of Tm upconversion emission in Mo, Tm codoped rare-earth garnets" Journal of Alloys and Compounds, (2023), 944, 169226.
4. D. Avram, A. A. Patrascu, M. C. Istrate, C. Tiseanu "Gd-Er interaction promotes NaGdF4: Yb, Er as a new candidate for high-power density applications" Journal of Materials Chemistry C (2023), Advance Article.
Conferinte Internationale
1.
D. Avram, C. Colbea, C. Tiseanu "Local symmetry effects on
the upconversion emission intensity, shape and mechanisms
under pulsed excitation" UPCONline
2021, 06 - 09 april 2021, Online Conference. (prezentare orala)
2. Daniel Avram,
Claudiu Colbea, Andrei A. Patrascu și Carmen Tiseanu
"Upconversion emission properties in transition metal,
lanthanide co-doped systems: a spectral selective,
time-resolved investigation", Spectral sHapIng For
biomedical and energy applicaTions International
Conference (SHIFT
2022) 10-14.10.2022, La Laguna, Spania (prezentare
orala)
Achizitii in cadrul Proiectului