Title
Judd-Ofelt theory and thermometry of europium doped materials
Creator
Ćirić, Aleksandar, 1983-, 36835431
Copyright date
2019
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Autorstvo 3.0 Srbija (CC BY 3.0)
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Language
English
Cobiss-ID
Theses Type
Doktorska disertacija
description
Datum odbrane: 27.05.2019.
Other responsibilities
mentor
Dramićanin, Miroslav, 1966-, 15294567
član komisije
Stojadinović, Stevan, 1964-, 23219559
član komisije
Belča, Ivan, 21708647
Academic Expertise
Prirodno-matematičke nauke
Academic Title
-
University
Univerzitet u Beogradu
Faculty
Fizički fakultet
Alternative title
Džad-Ofelt-ova teorija i termometrija europiumom dopiranih materijala
Publisher
[A. Ćirić]
Format
185 listova
description
Physics - Applied physics / Fizika - Primenjena fizika
Abstract (en)
The main topic of this research is an extension of the Judd-Ofelt theory, a
theoretical model applied to the luminescence thermometry, aimed to evaluate the
thermometric figures of merit through Judd-Ofelt intensity parameters. The rather
expensive, complicated and lengthy conventional method for evaluating the luminescence
intensity ratio thermometric properties of a given material would include recording
spectra at various temperatures and subsequent data analysis. This model is capable of
finding the best transitions for the given material, or various materials, from a roomtemperature spectra or Judd-Ofelt parameters given in literature. The model is originally
developed for Eu3+ doped compounds, but is extended for all lanthanide doped materials
from praseodymium to thulium.
In turn, in Eu3+ doped compounds, the model is able to predict the dipole strength
and radiative transition probability of transitions from 5D1 level, if Judd-Ofelt and
luminescence intensity ratio thermometric parameters are known. Such analysis was
performed on a TiO2:Eu3+ sample, created by the plasma electrolytic oxidation.
Judd-Ofelt analysis requires cumbersome calculations, and calculation by hand on
many materials to be tested would pose a practical problem. The solution was to create
an application software that would be able to calculate Judd-Ofelt intensity parameters
and derived quantities from emission spectra of Eu3+ doped compounds. Written in Java,
JOES application software was created and tested on TiO2:Eu3+, ZrO2:Eu3+, and
Nb2O5:Eu3+, with various europium concentrations, created by plasma electrolytic
oxidation process.
Luminescence intensity ratio thermometry was tested on TiO2:Eu3+, ZrO2:Eu3+,
and Nb2O5:Eu3+ samples. Temperature of the samples during the spectroscopic
measurements was controlled by the custom-made heating/cooling apparatus, consisting
of a hot plate, cold plate, a control/power unit, and a RTD reference thermometer.
Since plasma electrolytic oxidation is a protective coating method, already widely
employed for industrial purposes, the investigated samples obtain an additionalfunctionality of becoming temperature sensors, with possible applications in rotor
turbines, or on vehicles for hypersonic flights.
Since the photoluminescence properties of materials are investigated, the in-depth
analysis is performed on HfO2:Eu3+, prepared by plasma electrolytic oxidation, at various
europium concentrations. Morphology, chemical and phase composition was
investigated, since the photoluminescence is dependent those material properties. JuddOfelt analysis was performed on the sample, and the obtained parameter values are in
accordance with the europium site symmetry.
CIE chromaticity coordinates were investigated for all the samples, identifying
the material potentials for LED and display purposes, from orange-red to white.
HfO2:Eu3+ at low concentrations is a potential white LED phosphor.
Abstract (sr)
Glavni predmet istraživanja je proširenje Džad-Ofelt-ove teorije u vidu teorijskog
modela primenjenog na fenomen luminescentne termometrije, sa ciljem predviđanja
termometrijskih veličina preko Džad-Ofelt-ovih parametara. Tradicionalni metod za
ispitivanje termometrijskih osobina materijala pomoću odnosa intenziteta linija uključuje
snimanje spektara na različitim temperaturama i njihovu analizu. Ovaj model ima
sposobnost određivanja najboljih elektronskih prelaza za dati mateijal, ili za razne
materijale, na osnovu spektra snimljenog na sobnoj temperaturi ili Džad-Ofelt-ovih
parametera datih u literaturi. Model, isprva kreiran za Eu3+ dopirane materijale, proširen
je na sve materijale dopiranih lantanidima, od prazeodijuma do tulijuma.
Za Eu3+ dopirana jedinjenja, model može da predvidi jačinu dipolnih prelaza i
verovatnoće prelaza sa 5D1 nivoa, ukoliko su poznati Džad-Ofelt-ovi i termometrijski
parametri dobijeni iz metode odnosa intenziteta. Takva analiza je izvršena nad TiO2:Eu3+
uzorku, kreiranom plazmenom elektrolitičkom oksidacijom.
Džad-Ofelt-ova analiza zahteva kompleksna izračunavanja, tako da bi ručno
računanje nad podacima sa mnogo testiranih materijala predstavljalo praktičan problem.
Rešenje je u kreiranju softverske aplikacije koja bi mogla da izračuna Džad-Ovelt-ove
parametre i izvedene veličine pomoću emisionih spektara Eu3+ dopiranih materijala.
Napisana u Javi, JOES softverska aplikacija je napravljena i testirana na TiO2:Eu3+,
ZrO2:Eu3+, i Nb2O5:Eu3+, dopiranim sa više različitih koncentracija europiuma i kreiranih
plazmenom elektrolitičkom oksidacijom.
“Luminescence intensity ratio” termometrija je testirana na TiO2:Eu3+, ZrO2:Eu3+,
i Nb2O5:Eu3+ uzorcima. Temperatura uzoraka tokom spektroskopskih merenja
kontrolisana je za tu svrhu napravljenim aparatom za grejanje/hlađenje, koji se sastoji od
ploče za grejanje, ploče za hlađenje, kontrolne/naponske jedinice, i otpornog referentnog
termometra.Kako je plazmena elektrolitička oksidacija metod koji se u industriji koristi za
kreiranje zaštitnih slojeva, ispitani uzorci dobijaju dodatnu funkcionalnost kao
temperaturni senzori, sa mogućom primenom na rotoru turbina ili vozilima za
hipersonični let.
Pošto su ispitivane fotoluminiscentne osobine materijala, detaljna analiza je
izvršena nad HfO2:Eu3+, pripremljenim plazmenom elektrolitičkom oksidacijom, sa
raznim koncentracijama europiuma. Morfologija, hemijski i fazni sastav je ispitan, pošto
fotoluminiscencija pokazuje zavisnost od ovih osobina. Džad-Ofelt-ova analiza je
izvršena nad uzorkom, i dobijene vrednosti parametara se slažu sa simetrijom europijuma
u kristalnoj matrici.
CIELUV koordinate su izračunate za sve uzorke, identifikujući materijale
pogodne za LED i primenu za ekrane, od narandžasto-crvenih do belih. HfO2:Eu3+ sa
niskim koncentracijama europijuma je potencijalni beli LED fosfor.
Authors Key words
Judd-Ofelt, photoluminescence, thermometry, europium
Authors Key words
Džad-Ofelt, fotoluminiscencija, termometrija, europium
Classification
535.371:536.51(043.3)
Type
Tekst
Abstract (en)
The main topic of this research is an extension of the Judd-Ofelt theory, a
theoretical model applied to the luminescence thermometry, aimed to evaluate the
thermometric figures of merit through Judd-Ofelt intensity parameters. The rather
expensive, complicated and lengthy conventional method for evaluating the luminescence
intensity ratio thermometric properties of a given material would include recording
spectra at various temperatures and subsequent data analysis. This model is capable of
finding the best transitions for the given material, or various materials, from a roomtemperature spectra or Judd-Ofelt parameters given in literature. The model is originally
developed for Eu3+ doped compounds, but is extended for all lanthanide doped materials
from praseodymium to thulium.
In turn, in Eu3+ doped compounds, the model is able to predict the dipole strength
and radiative transition probability of transitions from 5D1 level, if Judd-Ofelt and
luminescence intensity ratio thermometric parameters are known. Such analysis was
performed on a TiO2:Eu3+ sample, created by the plasma electrolytic oxidation.
Judd-Ofelt analysis requires cumbersome calculations, and calculation by hand on
many materials to be tested would pose a practical problem. The solution was to create
an application software that would be able to calculate Judd-Ofelt intensity parameters
and derived quantities from emission spectra of Eu3+ doped compounds. Written in Java,
JOES application software was created and tested on TiO2:Eu3+, ZrO2:Eu3+, and
Nb2O5:Eu3+, with various europium concentrations, created by plasma electrolytic
oxidation process.
Luminescence intensity ratio thermometry was tested on TiO2:Eu3+, ZrO2:Eu3+,
and Nb2O5:Eu3+ samples. Temperature of the samples during the spectroscopic
measurements was controlled by the custom-made heating/cooling apparatus, consisting
of a hot plate, cold plate, a control/power unit, and a RTD reference thermometer.
Since plasma electrolytic oxidation is a protective coating method, already widely
employed for industrial purposes, the investigated samples obtain an additionalfunctionality of becoming temperature sensors, with possible applications in rotor
turbines, or on vehicles for hypersonic flights.
Since the photoluminescence properties of materials are investigated, the in-depth
analysis is performed on HfO2:Eu3+, prepared by plasma electrolytic oxidation, at various
europium concentrations. Morphology, chemical and phase composition was
investigated, since the photoluminescence is dependent those material properties. JuddOfelt analysis was performed on the sample, and the obtained parameter values are in
accordance with the europium site symmetry.
CIE chromaticity coordinates were investigated for all the samples, identifying
the material potentials for LED and display purposes, from orange-red to white.
HfO2:Eu3+ at low concentrations is a potential white LED phosphor.
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