The title chelates were prepared by benzoyltrifluoroacetone with TPPO

Bipy

Phen

N(Me)

4

OH and Eu

Tb

Sm

Dy chlorides.They are tri-β-diketonates and tetra-β-diketonates.The fluorescence spectra of solid paosphor were determined at room temperature.The transferable intensity of energy of europium chelates in

5

D

0

-

7

F

2

is the strongest.The relative intensities of luminescence for EuL

3

Bipy and EuL

3

(TPPO)

2

are very strong.They are 100% and 93.7% respectively.The transition is

5

D

4

-

7

F

5

for Tb

4

C

5/2

-

6

H

9/2

for Sm and

4

F

9/2

-

6

H

12/2

for Dy.The intensities of luminescence for the chelates of Tb

Sm and Dy are very weak

except TbL

3

(TPPO)

2

.Due to its higher stability

the fluorescence intensity of N(Me)

4

EuL

3

in nonpolar solvent is the strongest.It is found that a minute amount of EuL

3

Bipy or EuL

3

(TPPO)

2

in transparent resin will show sharp red fluorescence under the irradiation of~365nm light.