Y

2

O

3

:Eu

3+

is a red phosphor with good property.It is usually synthesized by high temperature solid state method.The particle size of the phosphor prepared by this method is lager

so it must be milled when used.The oxalic acid precipitation method was developed to synthesize non-grinded and small-size red phosphor in our experiment.Firstly

the mixture of Y

2

O

3

and Eu

2

O

3

was dissolved in nitric acid in certain proportion.Secondly

the prepared oxalic acid solution was placed in a reactor and at the same time a little surfactant was added in it.When the reaction temperature was controlled to be certain value

the nitric acid solution of Y

Eu was added.Afterwards the precipitation formed and then washed

filtrated

dried and calcined to become white Y

2

O

3

:Eu

3+

power.The Luminescent properties of the phosphor were mainly studied .The result shows that the particle diameter is 20～30nm.The agglomerate size is D

50

=0.53m.The particle is fine and the granularity distribution displays a narrow and normal distribution.The maximum excitation spectrum of the phosphor peaks at

=252.2nm

red shift 19.2nm compared with micro-Y

2

O

3

:Eu

3+

.The maximum emission spectrum peaks at

=612nm under 254nm excitation.Compared with the ordinary power of Y

2

O

3

:Eu

3+

the emission spectrum of the phosphor appears unchangeable.The luminescent intensity increases with growing of agglomerate size.The addition of Eu

3+

can constitute luminescent centers when Y

2

O

3

as basic particle and Eu

3+

as activator in Y

2

O

3

:Eu

3+

.The less the amount of the added Eu

3+

is

the lower the luminescent brightness of the phosphor is.The critical concentration of Eu

3+

increases from 6% for micro-Y

2

O

3

:Eu

3+

to 9% for nano-Y

2

O

3

:Eu

3+

.The phosphor shows a relative luminescent brightness about 70% of that of the micro-Y

2

O

3

:Eu

3+

because of the existence of hanging-bonds and defects on the surface of nano-Y

2

O

3

:Eu

3+

particles.The phosphor particle was increased and the defects on the surface of the phosphor was decreased at high temperature

so luminescent brightness of the phosphors was increased.Adding assist melting agent can decrease sintering temperature and increase D

50

of the phosphor

and the brightness of the phosphor increased

too.Coating-process on phosphor can dispel defact and increase brightness.The luminescent chromatic coordinate parameters of the phosphor are

x

=0.6479

y

=0.3442

which accords with the phosphor.