期刊
MATERIALS LETTERS
卷 93, 期 -, 页码 169-171出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2012.11.126
关键词
Photoluminescence; KBaBP2O8:Eu2+; Borophosphate phosphor; White LEDs
资金
- Important National Science and Technology Specific Projects of China [2009ZX02037]
A series of Eu2+-doped borophosphate phosphors, KBa1-xBP2O8: xEu(2+), were first synthesized via high-temperature solid-state reactions. The crystal structure, luminescence properties and concentration quenching of the as-prepared phosphors were systematically investigated. The results indicated that KBa1-xBP2O8: xEu(2+) phosphors could be efficiently excited by the near-ultraviolet to realize a novel blue luminescence corresponding to the electric-dipole allowed 4f-5d transition of the Eu2+ ions. Based on the theoretical calculation, the dipole-dipole interaction was dominantly involved in the mechanism of concentration quenching of Eu2+ in the phosphors, and the critical distance (R-c) was determined to be 22.77 angstrom. Additionally, the crystallographic site-occupation of the Eu2+ ions in the host was assigned and one Eu2+ site was confirmed in terms of photoluminescence spectra. In view of the preferable excitation spectrum profile and the intense blue emission peaking at 445 nm, the Eu2+-doped KBaBP2O8 phosphor is expected to find applications as a new blue-emitting phosphor for phosphor-converted light-emitting diodes. (C) 2012 Elsevier B.V. All rights reserved.
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