Details

Autor(en) / Beteiligte

• Schipper, W.J.
• van der Voort, D.
• van den Berg, P.
• Vroon, Z.A.E.P.
• Blasse, G.

Titel

The luminescence of europium in strontium borates

Ist Teil von

• Materials chemistry and physics, 1993-03, Vol.33 (3), p.311-317

Ort / Verlag

Lausanne: Elsevier B.V

Erscheinungsjahr

1993

Quelle

Elsevier Journal Backfiles on ScienceDirect (DFG Nationallizenzen)

Beschreibungen/Notizen

• At 300 K the Eu 2+ ion luminesces efficiently in SrB 4O 7, and to a lesser extent in SrB 6O 10 and Sr 3B 2O 6. In the last compound the lowest 4f-5d absorption band is at extremely low energy for Eu 2+. Due to this and a large Stokes shift, the Eu 2+ emission band has its maximum at 590 nm. From a comparison with the luminescence of Ce 3+ and Pb 2+ in this lattice it is concluded that a strong non-cubic crystal field splits the 5d excited state, causing the lowest f-d absorption transition to be at a low energy position. In SrB 2O 4 and Sr 2B 2O 5, only Eu 3+ was found. An explanation for this is proposed on the basis of a charge-compensation mechanism for Eu 3+; the luminescence of this ion is discussed as well.