Since Tang

et al

.developed a very high efficient fluorescent material(Alq

3

) and made the first OELD in 1987

novel organic electroluminescent materials had attracted much interest.Though developed for ten years more

the performances of 8-hydroxyquinoline metal complexes were more excellent than other organic electroluminescent materials in commerce utilizations

such as good light performance

good thermal stability

and good film formability.Alq

3

was the best representation

research on performances and applications of Alq

3

has matured.But the research on Znq

2

was not enough

which limited the commerce utilizations as an excellent organic electroluminescent material.At this point

some foundation research works were done here.Two Znq

2

-based organic electroluminescent materials

Znq

2

(H

2

O)

2

and(Znq

2

)

4

were prepared and characterized by infrared absorption spectrum(IR)

X-ray diffraction(XRD)

thermogravimetry(TG)

differential thermal analysis(DTA)

photoluminescence(PL) spectrum and electroluminescence(EL) spectrum.It was shown that the deviating temperature of H

2

O from Znq

2

(H

2

O)

2

is 161℃

the decomposing temperature of(Znq

2

)

4

into Znq

2

is 361℃

the glass transition temperature of Znq

2

(H

2

O)

2

is 104.2℃ and that of(Znq

2

)

4

is 204.9℃.In PL spectra

the peak wavelengths of Znq

2

(H

2

O)

2

and(Znq

2

)

4

are 505 nm and 550 nm respectively.In EL spectra

the peak wavelength of (Znq

2

)

4

is 539 nm.Because of special molecular spatial structure of(Znq

2

)

4

there is an electron tunnel between adjacent(Znq

2

)

4

molecules

which could increase electron transition efficiency from HOMO to LUMO and decrease drive voltage of OELD.The high glass transition temperature of(Znq

2

)

4

could prolong the lifetime of OELD. Above all

(Znq

2

)

4

have great potential in use as organic electroluminescent material.In addition

(Znq

2

(H

2

O)

2

) has great light intensity and narrow FWHM in PL spectra

and it is also a kind of potential(excellent) organic electroluminescent material.Application of(Znq

2

)

4

and Znq

2

(H

2

O)

2

in OELD will be discussed in detail in future articles.