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ChemInform Abstract: The Quantum Cutting of Tb3+ in Ca6Ln2Na2 (PO4)6F2 (Ln: Gd, La) under VUV—UV Excitation: With and Without Gd3+.

✍ Scribed by Mubiao Xie; Ye Tao; Yan Huang; Hongbin Liang; Qiang Su

Publisher
John Wiley and Sons
Year
2011
Weight
23 KB
Volume
42
Category
Article
ISSN
0931-7597

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✦ Synopsis

3+ . -The phosphors Ca6Gd2-xTbxNa2(PO4)6F2 show strong absorption in the vacuum UV (VUV) range and have intense emission upon 172 nm excitation, while Ca6La2-xTbxNa2(PO4)6F2 phosphors exhibit weaker absorption in the VUV range. The emission color of both phosphors can be tuned from blue to yellow-green by changing the Tb 3+ -doping concentration. Visible quantum cutting through cross relaxation between Tb 3+ ions occurs with and without Gd 3+ , but Gd 3+ -containing phosphors have a higher quantum cutting efficiency, confirming that Gd 3+ ions play an important intermediate role in energy transfer to convert VUV light to visible light and reinforce the cross relaxation efficiency during the quantum cutting process.

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