The organic light-emitting devices and related materials have attracted much interest recently due to the potential of application in organic solid electric devices. The study have show that Metal-chelate can be used as luminescence materials

for example

8-hydroxyquinoline Al has been used in OLED widely. 8-hydroxyquinoline (HQ) and Nd

3+

were reacted in the alkali condition to synthesis tris-(8-hydroxyquinoline) neodymium (Ndq

3

). The electronic and crystallographic structure of Ndq

3

have been studied. The structure of tris-(8-hydroxyquinoline) neodymium and the films of Ndq

3

was investigated by X-ray

infrared absorption (IRA)

UV-Vis and photoluminescence. From the IRA spectrum of the Ndq

3

broad characteristic peak at 3 438 cm

-1

corresponding to OH

-

stretching vibration confirmed that the NdO are coordinate non-ionic bond. The prominent peaks which are the characteristic of the absorption vibration of the aromatic ring skeleton at 1 602

1 565

1 496 and 1 461 cm

-1

suggests that the conjugate action of aromatic rings in molecule is very strong and all electron orbit of quinolinic rings are bonding hybridizations. The disagreement between IRA spectrum of Ndq

3

and HQ is excellent for indicating that there is a strong coordinate action which affects O bonding heavily between Al

3+

and O ions. UV absorption spectra of Ndq

3

shows that Ndq

3

have two peaks at 285 nm and 379 nm

optical bandwidth can be calculated to be 2.8 eV from absorption. Ndq

3

thin films were prepared the by vacuum coating technology with different substrate temperatures (340 K

360 K

380 K)

and were analyzed using XRD

the results show that Ndq

3

thin film is multi crystal in structure

and the higher the substrate temperature

the larger scale of the crystal scale

and the more uniform the surface. Ndq

3

emits bright fluorescence at 472 nm under ultraviolet excitation. It confirmed the existence of a fluorescent species forms between metal cation and 8-hydroxyquinolinol. The ionic radius of Nd are larger than that of Al and Zn

and its polarization force are weaker than that of Alq

3

and Znq

2

. Thus the peaks of Alq

3

and Znq

2

are red-shifted compared with Ndq

3

.