Rare earth organic chelate materials attract wide interest for its particular intense emission of rare earth ions compared to the rare earth doped inorganic materials.This is achieved by the organic ligands for its strong Absorption in ultraviolet region and efficient energy transfer to the rare earth ion centers.It leads to lots of applications in the fields of electroluminescence

waveguide devices and fiber amplifiers.During the studies

secondary ligand is found to be of much importance.It can substitute water chelate to reduce the non-radiative relaxation

take part in the energy transfer process

and Absorb photons to affect the Absorption limits.The synthesis and luminescent properties of Sm(DBM)

3

doped PMMA(polymethyl methacrylate) with three different secondary ligands: phen

TOPO

TPPO(DBM: dibenzoyl methane

Phen: 1

10-phenanthroline

TOPO: trioctylphophine oxide

TPPO: triphenylphophine oxide) are reported.The emission and excitation spectra of samples with and without secondary ligand are recorded.The emission peaks are assigned to different transitions of Sm

3+

as a weak broad band also appears due to direct emission from ligands.The excitation bands of different secondary ligands show obvious shifts compared to that of pure Sm(DBM)

3

doped PMMA

the excitation efficiency also varies.Decay curves of the Sm

3+

emission of all these samples are measured

and lifetimes of the level

4

G

5/2

are obtained.The spectroscopic differences among the samples are discussed.The results show that the best secondary ligand here is TPPO.