Much attention has been paid to search for high-efficient phosphor with the development of displaying device.Some commercial blue phosphors

such as BaMgAl

10

O

17

:Eu

2+

do not meet the ever demanding requirements

they suffer decreasing performance of brightness and color quality because of the serious deterioration.New blue phosphor with stable hosts was belived to be a better way to solve this problem.In the(silicate) host series

Eu

2+

appeared to be a feasible candidate for the blue emitting vehicle originating from(5d-4f)(around 420 nm) transition.SrAl

2

Si

2

O

8

:Eu

2+

a potential excellent blue phosphors suitable for making PDP device and other luminescent apparatus

are conventionally prepared using solid-state reaction at high temperature.However

it is(difficult) to control over particles size and crystal structure at this condition

meanwhile the reaction temperature is so high

serious challenging problems arise to the equipment.Sol-gel method is one of the "soft" chemical methods

which have been employed successfully to prepare phosphor particles with better morphology and(operate) in a lower temperature

compared with solid-state reaction

in recent years.We reported the synthesis of the blue rare earth phosphor SrAl

2

Si

2

O

8

:Eu

2+

by sol-gel method.The sol-gel method was adopted by reacting corresponding nitrate and tetraethylothosilicate(TEOS) at a 85℃ water bath to form a gel

from which the dried precursor was reduced at relatively low temperature of 921℃ to(generate) a blue fluorescence material SrAl

2

Si

2

O

8

:Eu

2+

.The product synthesized was characterized by thermogravimetry(TG)

differential scanning calorimetry(DSC)

X-ray diffraction analysis(XRD)

and fluorescence spectrophotometry.Influential factors in the process of the sol-gel preparation

such as pH value

(ethanol) content

(amount) of citric acid

were studied in depth

and the optimal conditions for synthesizing SrAl

2

Si

2

O

8

:Eu

2+

were determined.XRD analysis indicates that when the mole ratio between citric acid and metal ion was 1:1

the minimal amount of anhydrous ethanol sufficient to secure a total dissolution of tetraethylothosilicate was used

and the pH value between 1.0~2.0 was maintained

the pure SrAl

2

Si

2

O

8

with hexagonal crystal phase could be obtained.The light emitting analysis showed that with the monitoring wavelength 463 nm emission the product gave an exited peak at 327 nm

and an incident light with wavelength 394 nm could generate a fluorescent light with emitting wavelength 468 nm from this phosphor.