| Autor: |
Vengala Rao Bandi, Jae-Min Lim, S. S. Kim, Kiwan Jang, Bhaskar Kumar Grandhe, Dong-Soo Shin, Yong-Ill Lee, Tae Kwon Song |
| Rok vydání: |
2011 |
| Předmět: |
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| Zdroj: |
Journal of Luminescence. 131:2414-2418 |
| ISSN: |
0022-2313 |
| DOI: |
10.1016/j.jlumin.2011.06.004 |
| Popis: |
CaZrSi 2 O 7 (CZS), a modification of the thortveitite family, was prepared as a polycrystalline powder material by the conventional solid-state reaction method. Structural, thermal and photoluminescence (PL) properties of the prepared material were investigated in order to evaluate its potentiality. XRD patterns confirm the monoclinic phase of CaZrSi 2 O 7 : Eu 2+ phosphors.. Emissions arising from transitions between the 5d and 4f orbital gaps of Eu 2+ are manifested in the broadband excitation and emission spectra with major peaks at 363 and 512 nm, respectively. The excitation wavelength matches well with that of the emission of the ultraviolet-light emitting diode (UV-LED). Concentration quenching occurs when the Eu 2+ concentration is beyond 0.05 and the dipole–dipole interaction was the reason for the corresponding quenching mechanism. The temperature dependence of emission intensity of CZS: Eu 2+ phosphor was investigated and it showed better thermal stability than the standard YAG: Ce 3+ phosphor. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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