Synthesis of CaAl2O4:Eu,Nd long persistent phosphor by combustion processes and its optical properties

Zhao, Changliang; Chen, Donghua

doi:10.1016/j.matlet.2006.12.015

Cited by 72 publications

(33 citation statements)

References 15 publications

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“…[16] atmosphere of N 2 -4% H 2 . The excitation shows a broadband wavelength from 250 to 430 nm with the maximum peak at 325 nm and the emission is symmetrically broadband peaking at 440 mm, which are in good agreement with other reports [15,16]. The characteristic broad-band luminescence originates from the transition between the 8 S 7/2 (4f 7 ) ground state and the crystal field components of the 4f 6 5d 1 excited state configuration.…”

Section: Introductionsupporting

confidence: 91%

Investigation of photocatalytic reaction for thetitanium dioxide-phosphor composite

Yoon

Kim

2009

Ionics

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The present study examined the photocatalytic reaction of titanium dioxide (TiO 2 )-coated, phosphor composite particles. Nanocrystalline TiO 2 layers were directly coated on the alkaline earth aluminate phosphor (CaAl 2 O 4 :Eu 2+ ,Nd 3+ ) particles by a sol-gel processing method and their photocatalytic reaction was analyzed according to the degradation of methylene blue aqueous solution under visible light irradiation. Compared with pure TiO 2 , the TiO 2 -coated phosphor powders showed a different photocatalytic mechanism and much faster photocatalytic reactivity under visible irradiation than that of pure TiO 2 , which was almost negligible. The mechanism of the photocatalytic reactivity for the TiO 2 -phosphor composite was discussed in terms of the energy band structure and phosphorescence. In addition, the TiO 2 -coated phosphor powders were characterized by X-ray diffraction and transmission electron microscopy.

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Section: Introductionsupporting

confidence: 91%

Investigation of photocatalytic reaction for thetitanium dioxide-phosphor composite

Yoon

Kim

2009

Ionics

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“…The emission is a symmetrical band at 440 nm which is credited to the typical 4f 6 5d 1 -4f 7 transition of the Eu 2? ion [16]. It indicates that, though their intensity had slightly lessened, the TiO 2 coatings had little affect on the optical property of CaAl 2 O 4 :Eu 2?…”

Section: Resultsmentioning

confidence: 95%

Photocatalysis enhancement of CaAl2O4:Eu2+, Nd3+@TiO2 composite powders

Wang

2010

Res Chem Intermed

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CaAl 2 O 4 :Eu 2? , Nd 3? @TiO 2 composite powders were synthesized by a sol-gel method under mild conditions (i.e. low temperature and ambient pressure). The as-prepared powders were characterized by transmission electron microscopy (TEM) and analyzed by X-ray diffraction (XRD). The photocatalytic behavior of the TiO 2 -base surfaces was evaluated by the degradation of nitrogen monoxide gas. It suggested that CaAl 2 O 4 :Eu 2? , Nd 3? @TiO 2 composite powders were composed of anatase titania and that CaAl 2 O 4 :Eu 2? , Nd 3? . TiO 2 particles were deposited on the surface of CaAl 2 O 4 :Eu 2? , Nd 3? to form uniform film. CaAl 2 O 4 :Eu 2? , Nd 3? @TiO 2 composite powders exhibited higher photocatalytic activity compared with pure TiO 2 under visible light. And the result also clearly indicated that the long afterglow phosphor absorbed and stored lights for the TiO 2 to remain photocatalytic activity in the dark.

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“…[20] We aim to synthesize optimal long-persistence phosphor CaAl 2 3+ possesses the correct affinity toward to the electrons in the energy level, and can release electrons slowly and produce long afterglow luminescence. The greater the trap energy level, the more electrons are stored in the energy level.…”

Section: Influence Of Content Of Dymentioning

confidence: 99%

Synthesis of the long‐persistence phosphor CaAl₂O₄:Eu²⁺, Dy³⁺, Nd³⁺ by combustion method and its luminescent properties

2009

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Calcium aluminate phosphor co-doped Eu(2+), Dy(3+), Nd(3+) is prepared by the combustion method. We study systemically the influences of the quantity of mixed Dy(3+) ion, the quantity of flux H(3)BO(3), the differences in dispersing methods between magnetic stirring and ultrasonic dispersing and the combustion temperature on the long-persistence phosphor. The analytical results indicate that Dy(3+) ion improves the properties of the phosphors CaAl(2)O(4):Eu(2+), Nd(3+). The appropriate quantity of flux H(3)BO(3 )to( )reduce the forming temperature of the sample was determined. The monoclinic single phase of CaAl(2)O(4) formed at 500 degrees C and remained steady. The calcium aluminate co-doped Eu(2+), Dy(3+), Nd(3+) was synthesized by dispersal of the raw material using the ultrasonic method, and it had better optical properties.

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Synthesis of CaAl2O4:Eu,Nd long persistent phosphor by combustion processes and its optical properties

Cited by 72 publications

References 15 publications

Investigation of photocatalytic reaction for thetitanium dioxide-phosphor composite

Investigation of photocatalytic reaction for thetitanium dioxide-phosphor composite

Photocatalysis enhancement of CaAl2O4:Eu2+, Nd3+@TiO2 composite powders

Synthesis of the long‐persistence phosphor CaAl₂O₄:Eu²⁺, Dy³⁺, Nd³⁺ by combustion method and its luminescent properties

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Synthesis of CaAl2O4:Eu,Nd long persistent phosphor by combustion processes and its optical properties

Cited by 72 publications

References 15 publications

Investigation of photocatalytic reaction for thetitanium dioxide-phosphor composite

Investigation of photocatalytic reaction for thetitanium dioxide-phosphor composite

Photocatalysis enhancement of CaAl2O4:Eu2+, Nd3+@TiO2 composite powders

Synthesis of the long‐persistence phosphor CaAl2O4:Eu2+, Dy3+, Nd3+ by combustion method and its luminescent properties

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Synthesis of the long‐persistence phosphor CaAl₂O₄:Eu²⁺, Dy³⁺, Nd³⁺ by combustion method and its luminescent properties