Sinteza, strukturne i optičke osobine itrijum-hafnata, itrijum-cirkonata i itrijum-stanata dopiranih jonima europijuma
Synthesis, structural and optical properties of yttrium-hafnate, yttrium-zirconate and yttrium-stanate doped with europium ions
dc.contributor.advisor | Roglić, Goran | |
dc.contributor.other | Dramićanin, Miroslav | |
dc.contributor.other | Jovanović, Dragana | |
dc.contributor.other | Nikolić, Aleksandar | |
dc.contributor.other | Manojlović, Dragan | |
dc.creator | Papan, Jelena | |
dc.date.accessioned | 2018-11-30T16:41:09Z | |
dc.date.available | 2018-11-30T16:41:09Z | |
dc.date.available | 2020-07-03T10:13:42Z | |
dc.date.issued | 2018-07-06 | |
dc.identifier.uri | http://eteze.bg.ac.rs/application/showtheses?thesesId=6242 | |
dc.identifier.uri | https://nardus.mpn.gov.rs/handle/123456789/10219 | |
dc.identifier.uri | https://fedorabg.bg.ac.rs/fedora/get/o:18849/bdef:Content/download | |
dc.identifier.uri | http://vbs.rs/scripts/cobiss?command=DISPLAY&base=70036&RID=50653711 | |
dc.description.abstract | U okviru ove doktorske disertacije sintetisani su neorganski luminescentni materijali opšte formule A2B2O7 (A3+, B4+) na bazi itrijum-hafnata (Y2Hf2O7), itrijum-cirkonata (Y2Zr2O7) i itrijum-stanata (Y2Sn2O7) i koji su dopirani jonima europijuma (Eu3+) u širokim opsezima koncentracija. Materijali su sintetisani metodom termalne dekompozicije uz korišćenje PEG-a kao goriva i ko-precipitacionom tehnikom uz dodatno žarenje na optimalnoj temperaturi u vremenskom intervalu od 24 sata. Dopiranje je izvršeno u opsegu 0≤ x ≤ 1 za sisteme Y2-xEuxHf2O7 i Y2-xEuxZr2O7 i u opsegu 0≤ x ≤ 0,6 za sistem Y2-xEuxSn2O7 (gde je x udeo Eu3+ jona). Sintetisani su i uzorci kod kojih je jon itrijuma (A3+ = Y3+) potpuno zamenjen jonima gadolinijuma (Gd3+) i lutecijuma (Lu3+) pri čemu je koncentracija europijuma bila konstantna. Svi uzorci su kristalisali u defektno fluoritnu fazu prostorne grupe Fm3̅m. Dobijene su čestice nanodimenzija, pretežno kockastog oblika. Detaljno su ispitivane optičke osobine. Sve ispitivane uzorke karakteriše efikasna apsorpcija na 464 nm i dominatna emisija u crvenom delu spektra na oko 612 nm. Određena su vremena života, kritična rastojanja, tip multipolarnih interakcija odgovornih za gašenje signala i matematički su definisane boje. Džud-Ofeltovom analizom je utvrđeno da povećanje procenta dopiranja dovodi do smanjenja asimetričnog odnosa što ukazuje da okruženje oko jona dopanta (Eu3+) sa povećanjem procenta dopiranja postaje simetričnije. Neke od ispitivanih uzoraka karakteriše i jako visoka kvantna efikasnost ( > 90%) što je izuzetno bitno za eventualnu komercijalnu primenu. | sr |
dc.description.abstract | Within this doctoral thesis, synthesized samples are inorganic luminescent materials, with general formula A2B2O7 (A3+, B4+), bazed on yttrium-hafnate (Y2Hf2O7), yttrium-zirconate (Y2Zr2O7 ) and yttrium-stanate (Y2Sn2O7) doped with europium ions, in wide concentration range. These materials were synthesized by PEG and co-precipitation method, at optimal temperature, for 24 h. Also, one part of obtained samples are samples where are yttrium ions (Y3+) completely exchanged with gadolinium ions (Gd3+) and lutetium ions (Lu3+), where concentration of europium is constant (1 at. Eu3+). Samples are doped in range 0≤ x ≤ 1 in systems Y2-xEuxHf2O7 and Y2-xEuxZr2O7, and in range 0≤ x ≤ 0,6 in system Y2-xEuxSn2O7 (where x is atomic percentage of Eu3+). All samples are crystalited in defect-flurite phase, with space group Fm3̅m. Obtained particles have nanodimensions, predominantly round-cube shape. Detailed study of optical properties is examined. Studied samples had caracteristic effective absorption at 464 nm, with a red emission of about 612 nm. Determined parameters are: life time, critical distance, type of multipolar interactions responsable for signal quenching and emitting colors are matematicaly defined. Judd-Ofelt analysis showed that doping increases the asymmetric ratio, which indicates that the dopant environment (Eu3+) with more doping becomes more symmetrical. Some of the tested samples are characterized by very high quantum efficiency ( > 90%) which is important for possible commercial application. | en |
dc.format | application/pdf | |
dc.language | sr | |
dc.publisher | Универзитет у Београду, Хемијски факултет | sr |
dc.rights | openAccess | en |
dc.rights.uri | https://creativecommons.org/licenses/by-nc-nd/4.0/ | |
dc.source | Универзитет у Београду | sr |
dc.subject | Itrijum-hafnat | sr |
dc.subject | yttrium-hafnate | en |
dc.subject | yttrium-zirconate | en |
dc.subject | yttrium-stanate | en |
dc.subject | europium ion | en |
dc.subject | inorganic luminescent materials | en |
dc.subject | itrijum-cirkonat | sr |
dc.subject | itrijum-stanat | sr |
dc.subject | jon europijuma | sr |
dc.subject | neorganski luminescentni materijali | sr |
dc.title | Sinteza, strukturne i optičke osobine itrijum-hafnata, itrijum-cirkonata i itrijum-stanata dopiranih jonima europijuma | sr |
dc.title.alternative | Synthesis, structural and optical properties of yttrium-hafnate, yttrium-zirconate and yttrium-stanate doped with europium ions | en |
dc.type | doctoralThesis | en |
dc.rights.license | BY-NC-ND | |
dc.identifier.fulltext | http://nardus.mpn.gov.rs/bitstream/id/29568/Disertacija.pdf | |
dc.identifier.fulltext | http://nardus.mpn.gov.rs/bitstream/id/29569/IzvestajKomisije18419.pdf | |
dc.identifier.fulltext | https://nardus.mpn.gov.rs/bitstream/id/29569/IzvestajKomisije18419.pdf | |
dc.identifier.fulltext | https://nardus.mpn.gov.rs/bitstream/id/29568/Disertacija.pdf | |
dc.identifier.rcub | https://hdl.handle.net/21.15107/rcub_nardus_10219 |