The temperature-dependent luminescence of Sm²⁺ ions in MBPO₅ (M = Ca²⁺, Sr ²⁺, Ba²⁺ was studied. At low temperature, Sm²⁺ in this series shows 4f⁶-4f⁶ luminescence with only a single emission line observed for the ⁵D₀→⁷F₀ transition, revealing that only one crystallographic cationic site is available for Sm²⁺ in all the hosts. With increasing temperature, the emission intensity of the ⁵D₀→⁷F₀ transition increases whereas that of the ⁵D₀→⁷F₁ transitions decreases. The ⁵D₁→⁷F₀ transitions of Sm²⁺ were observed in BaBPO₅ and its intensity increases with increasing temperature. At 450 K, a broad band of the 4f⁵5d-4f⁶ luminescent transition of Sm²⁺ in SrBPO₅ and BaBPO₅ with maximum at ~600 nm appears due to the thermal population. The lifetime of the ⁵D₀→⁷F₀ transition was recorded at different temperatures, showing a single exponential decay for Sm²⁺ in SrBPO₅ and BaBPO₅ but a nonsingle- exponential decay in CaBPO₅.

Item Type:	Refereed Article
Research Division:	Chemical Sciences
Research Group:	Inorganic chemistry
Research Field:	F-block chemistry
Objective Division:	Expanding Knowledge
Objective Group:	Expanding knowledge
Objective Field:	Expanding knowledge in the chemical sciences
UTAS Author:	Kilah, NL (Dr Nathan Kilah)
ID Code:	87072
Year Published:	2003
Web of Science® Times Cited:	40
Deposited By:	Austn Centre for Research in Separation Science
Deposited On:	2013-11-06
Last Modified:	2013-12-10
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