Preparation and Luminescent Characterization of M5(PO4)3Cl (M: Sr, Ca) Chlorapatites by a Solid-state Reaction Method

M 5 (PO 4 ) 3 Cl:Eu(M: Sr, Ca) chlorapatites were prepared by solid-state reaction with NH 4 Cl and CaCl 2 as chlorine sources, respectively. Phase formation and luminescent properties strongly depended on chlorine sources and firing atmosphere. With NH 4 Cl, β-Ca 3 (PO 4 ) 2 as well as Ca 5 (PO 4 )...

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Bibliographic Details
Published in:Synthesis and reactivity in inorganic, metal-organic, and nano-metal chemistry metal-organic, and nano-metal chemistry, 2008-04, Vol.38 (3), p.307-311
Main Authors: Hwang, Min Ha, Kim, Young Jin, Jung, Sang Hyun, Han, Sang Hyuk
Format: Article
Language:English
Subjects:
chlorapatite
europium
flux method
luminescence
phosphors
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Summary:M 5 (PO 4 ) 3 Cl:Eu(M: Sr, Ca) chlorapatites were prepared by solid-state reaction with NH 4 Cl and CaCl 2 as chlorine sources, respectively. Phase formation and luminescent properties strongly depended on chlorine sources and firing atmosphere. With NH 4 Cl, β-Ca 3 (PO 4 ) 2 as well as Ca 5 (PO 4 ) 3 Cl was produced, while a single phase Ca 5 (PO 4 ) 3 Cl could be achieved with CaCl 2 . Ca 5 (PO 4 ) 3 Cl:Eu 3+ prepared at N 2 atmosphere exhibited a red emission around 613 nm with 390 nm excitation, while, under the reduction circumstance, Ca 5 (PO 4 ) 3 Cl:Eu 2+ showed a blue emission around 460 nm with 370 nm excitation. The substitution of Sr 2+ for Ca 2+ caused the blue-shift of emission wavelength due to the weak crystal field.
ISSN:1553-3174
1553-3182
DOI:10.1080/15533170802023528