Influence of synthesis parameters on luminescence emission properties of some sol-gel derived Eu3+ doped willemite phosphors
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 compensa...
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| Testületi szerző: | |
| Dokumentumtípus: | Könyv része |
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SZAB
Szeged
2012
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| Sorozat: | Proceedings of the International Symposium on Analytical and Environmental Problems
17 |
| Kulcsszavak: | Kémia |
| Tárgyszavak: | |
| Online Access: | http://acta.bibl.u-szeged.hu/76452 |
| Tartalmi kivonat: | 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. |
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| Terjedelem/Fizikai jellemzők: | 315-318 |
| ISBN: | 978-963-315-066-5 |