Study on the Valence State of Eu Ions in Sr3Al2O6:Eu Phosphor

Autor:	Jae Soo Yoo, Bo Yong Han, Jin Hyung Kim, Hyun Ho Shin, Kyung Pil Kim
Rok vydání:	2010
Předmět:	Valence (chemistry) General Engineering Analytical chemistry Strontium aluminate General Physics and Astronomy chemistry.chemical_element Mineralogy Phosphor Mole fraction Redshift Ion chemistry.chemical_compound chemistry Lattice (order) Europium
Zdroj:	Japanese Journal of Applied Physics. 49:042601
ISSN:	1347-4065 0021-4922
DOI:	10.1143/jjap.49.042601
Popis:	Europium-activated strontium aluminate phosphor, Sr3Al2O6:Eu2+, was prepared by solid-state reaction. The main concerns on the formation of a stable Sr3Al2O6 phase and the complete reduction of europium ions in this crystal phase, which is considered controversial in the literature and is available for white light-emitting-diode application, were addressed. It was found that the single phase of Sr3Al2O6 could be well formed and the valence state of europium ions depended on treatment temperature, flux, reduction gas, and the resultant stiffness of the host lattice. The redshift emission of Eu2+ in the Sr3Al2O6 host was not marked in our experimental regime. However, the green emission of Sr3Al2O6:Eu2+ increased gradually with the mole fraction of Al2O3 to SrCO3 in the starting materials owing to the complete formation of the Sr3Al2O6 phase.
Databáze:	OpenAIRE
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