Red phosphor LiEu (SiO

2

)

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particles were prepared by ultrasonic spray pyrolysis.The effects of firing temperature

concentration of precursor solution and flow rate of carrier gas on phosphor relative emission intensity were studied.The morphology and luminescence characteristics of the particles were investigated by scanning electron microscope (SEM)

X-ray diffraction

excitation spectra and emission spectra respectively.The particles were like spherical shape

around 1.5μm in diameter and with narrow size distribution.Aggregation between particles was not observed.Spray pyrolysis makes Eu

3+

well distributed in the crystal lattice as the luminescent centers.The phosphor LiEu(SiO

2

)

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particles prepared by spray pyrolysis have higher emission intensity than that by solid state reaction.The main excitation peak of the particles is near 396 nm.The main peak of the emission spectra under 396 nm light excitation is a transition

5

D

0

→

7

F

2

of Eu

3+

at 615 nm

while other emission peaks are transitions

5

D

0

→

7

F

1

5

D

0

→

7

F

3

and

5

D

0

→

7

F

4

of Eu

3+

at 592 nm

655 nm

702 nm respectively.The intensity of other emission peaks is weak

which is advantageous to obtain the good CIE chromaticity coordinates.The CIE chromaticity coordinates are calculated to be

x

=0.6679

y

=0.3310 for the emission of LiEu(SiO

2

)

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.The particles may be used for white-LED excitated by ultraviolet chip.Compared with traditional solid state reaction

spray pyrolysis have many advantages.For example

pure phase particles are achieved

flux and milling are not needed and phosphor prepared by spray pyrolysis can be produced continuously

etc.

Luminescent materials prepared by spray pyrolysis have become focus of research in recent years.Yet red phosphor LiEuSi

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particles prepared by spray pyrolysis have never been reported.