Enache Corina and Dudás Zoltán and Dascalu Daniela: Influence of synthesis parameters on luminescence emission properties of some sol-gel derived Eu3+ doped willemite phosphors.
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Abstract
Europium doped zinc silicate phosphor sample, corresponding to general formula, Zn2-(x+y)EuxLiySi0 4 , (where x = 0.01 or 0.02 and y = 0, 0.01, or 0, 02), have been synthesized by acid, or two steps (acid-base) catalyzed sol-gel processing, in the presence, or absence of Li+ ions, as charge compensator. The obtained xerogel samples was successively annealed, at different steps, up to 1000°C, for 180 minutes time soaking for each temperature. Starting from 700°C temperature, the formation of Si-O-Zn linkage was put in evidence by FT-IR spectra. The appearance of IR signals corresponding to willemite vibration modes has been observed for 900°C calcined samples. At UV excitation beam, the luminescence spectra of Zn2Si0 4 :Eu3+ synthesized phosphors samples show some emission peaks in the red region of spectra, assigned to 5Do—> Fj (j = 0, 1, 2, 3, 4 and 5) spin forbidden f-f transitions of Eu3+ ions, respectively. Specifically they were situated around 575 nm, 590 nm, 615 nm, 624 nm, 650 nm and 700 nm. The most intense emission was observed for the 1000°C calcined sample, with 0.02 moles Eu3+ activator content, prepared with charge compensator.
| Item Type: | Conference or Workshop Item |
|---|---|
| Journal or Publication Title: | Proceedings of the International Symposium on Analytical and Environmental Problems |
| Date: | 2012 |
| Volume: | 17 |
| ISBN: | 978-963-315-066-5 |
| Page Range: | pp. 315-318 |
| Language: | English |
| Publisher: | SZAB |
| Place of Publication: | Szeged |
| Event Title: | International Symposium on Analytical and Environmental Problems (17.) (2011) (Szeged) |
| Event Type: | Conference |
| Event Location: | Szeged |
| Event Dates: | 2011. szeptember 19. |
| Related URLs: | http://acta.bibl.u-szeged.hu/76381/ |
| Uncontrolled Keywords: | Kémia |
| Additional Information: | Bibliogr.: 318. p. ; ill. ; összefoglalás angol nyelven |
| Subjects: | 01. Natural sciences 01. Natural sciences > 01.04. Chemical sciences |
| Date Deposited: | 2022. Aug. 10. 12:56 |
| Last Modified: | 2022. Aug. 22. 10:23 |
| URI: | http://acta.bibl.u-szeged.hu/id/eprint/76452 |
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