Eu3+ pakeistų Y3Ga5O12 granatų sintezė ir liuminescencinių savybių tyrimas /

The Eu3+ doped materials are important compounds as red phosphors in fluorescence lamps, cathode ray tubes, field emission and electroluminescence displays, plasma display panels and etc. It is known that the chemical composition and structure of the host materials influence the optical properties of such materials considerably. Yttrium gallium Y3Ga5O12 (YGG) garnets are widely used as the core host materials for luminescence. The effect of the europium content on the luminescence properties is discussed in the present work. The series of powder samples were synthesized by citric sol—gel processing route. The concentration of dopant Eu3+ in every compound was 5 %, 10 %, 15 %, 20 %, 25 %, 30 %, 50 %, 75 %, 100 %. According to the XRD data all co-doped garnets are single phase. SEM photos by scanning electron microscope FE-SEM Hitachi SU-70 give information about particle morphology, size and formation of agglomerates. Using Edinburgh Instruments FLS980 spectrometer excitation, emission and decay time spectra were recorded in UV/VIS range. For thermal quenching (TQ) measurements had been applied to the present spectrometer. Measurements were carried out from 77 to 500 K in 50 K steps. It was demonstrated that the transitions of the 5D0 → 7F4 are dominant in europium doped YGG. The percentage fraction of the 5D0 → 7F1, 5D0 → 7F2 and 5D0 → 7F4 transitions with respect to the whole Eu3+ emission spectrum were calculated and discussed.

Grantor dc:publisher

Institutional Repository of Vilnius University

Year dc:date

2016

Author dc:creator

• Vaškytė, Živilė,

Contributors dc:contributor

• Skaudžius, Ramūnas

Statement dc:rights

• info:eu-repo/semantics/openAccess

Language dc:language

lit

Repository record dc:identifier

https://repository.vu.lt/VU:ELABAETD35558088&prefLang=en_US

OAI identifier oai:identifier

oai:vu.lt:elaba:35558088