Hydrothermal synthesis and characteristics of anions-doped calcium molybdate red powder phosphors
- College of Chemistry and Materials Science, Hebei Normal University, Shijiazhuang 050024 (China)
- State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084 (China)
Graphical abstract: - Highlights: • Four anion-doped CaMoO{sub 4}:Eu{sup 3+} red phosphors were prepared by hydrothermal approach. • Some samples exhibit nearly spherical morphology and well-distributed fine particles. • The red luminescence can be obviously enhanced after certain amount of anion doping. • The improved phosphor system is a potential candidate for white LED applications. - Abstract: Applying hydrothermal and subsequent heat-treatment process, CaMoO{sub 4}:Eu{sup 3+} was doped with four anions (SiO{sub 3}{sup 2−}, PO{sub 4}{sup 3−}, SO{sub 4}{sup 2−} and ClO{sub 3}{sup −}) to prepare fine red powder phosphors. The introduction of small amount of anions into the host had little influence on the structure, which was confirmed by X-ray diffraction patterns. The anion-doped phosphor samples (except SiO{sub 3}{sup 2−}) exhibited nearly spherical morphology, and the particle sizes were in the range of 0.3–0.4 μm for SO{sub 4}{sup 2−}-doped samples, and 0.8–1.2 μm for PO{sub 4}{sup 3−} and ClO{sub 3}{sup −}-doped samples. Excited with 395 nm near-UV light, all samples showed typical Eu{sup 3+} red emission at 615 nm, and PO{sub 4}{sup 3−}, SO{sub 4}{sup 2−} and ClO{sub 3}{sup −}-doped samples enhanced the red luminescence as compared with the individual CaMoO{sub 4}:Eu{sup 3+} sample. In particular, relative emission intensity for optimum ClO{sub 3}{sup −}-doped phosphors reached more than 6-fold that of the commercial red phosphor, which is highly desirable for the powder phosphors used in the solid-state lighting industry.
- OSTI ID:
- 22285123
- Journal Information:
- Materials Research Bulletin, Vol. 48, Issue 10; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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