1 Yb 3 + and Yb 3 + - Eu 3 + luminescent properties of the
نویسندگان
چکیده
The luminescence of Yb in the oxyborate Li2Lu5O4(BO3)3 is reported. At low temperature, in addition to the usual ytterbium infrared emission, this phosphor presents an emission in the ultraviolet (λmax= 345 nm) which corresponds to the transition from the charge transfer state (O-Yb) to the 4f levels of Yb. The temperature quenching Tq50% is equal to 120K. The infrared emission studied at room temperature is located between 950 and 1100 nm. An europium emission quenching in the Li2Yb5O4(BO3)3 phase is related to an Eu→Yb transfer by cross-relaxation. The reverse Yb→Eu transfer by cooperative sensitization is highlighted in the codoped Li2Lu5O4(BO3)3 compound. PACS: Keys words: oxyborate, luminescence, ytterbium, europium, cooperative sensitization Corresponding author: Véronique Jubera Address: I.C.M.C.B-C.N.R.S – Université Bordeaux 1 87, av. A. Schweitzer 33608 PESSAC cedex FRANCE Phone: +33 5 40 00 37 03 Fax: +33 5 40 00 27 61 E-mail: [email protected]
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