LaO

X

:Ho

3+

phosphors (

X

-

=Cl

-

Br

-

) were synthesized and their fluorescence spectra at room temperature and liquid nitrogen temperature were measured. Based on the Double Sphere Coordination Point Charg eField (DSCPCF) model

the coordination field perturbation energy levels of Ho

3+

ions doped in LaO

X

matrixes were calculated and the corresponding spectra assigned. The energy levels calculated agree well with the spectra observed. And the theoretical assignments bring out a resonable explanation for the "Saddle-shaped" excitation band of

5

I

8

-

5

G

6

hypersensitive transition and the temperature effect on

5

I

8

-

5

G

6

and (

5

S

2

5

F

4

)-

5

I

8

transition bands. By comparison with Point Charge Field (PCF) model

DSCPCF model makes

B

m

2

decrease slightly

while

B

m

4

and especially

B

m

6

increase greatly. It is this correction that overcomes the shortcoming of PCF model in certain degree.