Organic light-emitting diode (OLED) has attracted considerable attention due to their unique image quality and market potentials in display application.For the full-color display applications

it is essential to deliver the primary RGBemitters with high luminous efficiency

saturated color chromaticity

among which 9

10-Di (2-naphthyl) anthracene (ADN) is one of the stable and pure blue emitters.However

little attention has been paid to the influences of ADN’s purification on the electroluminescent (EL) performance.Synthesis and purification of ADNwere studied.The photoluminescence (PL) and electroluminescence (EL) spectra of ADNsynthesized and purified are investigated

respectively.The PLspectrum of ADNpurified exhibits an emitting peak at 434 nm with a full-width at half-maxium (FWHM) of 54.2 nm

while the rough material without purification is red shifted to 436 nm with the same FWHMof 54.2 nm.Organic light-emitting diodes (OLEDs) with a structure of indium tin oxide (ITO) (100 nm)/N

N’-biphenyl-N

N’-bis-(1-naphenyl)-[1

1’-biphenyl]-4

4’-diamine (NPB) (40 nm)/ADN (30 nm)/tris (8-quinolinolate) aluminum (Alq

3

) (20 nm)/LiF (1 nm)/Al (100 nm) are fabricated

where the rough and purified ADNare used as emitting layers in DiodeⅠand in DiodeⅡ

respectively

NPBis used as hole transport layer

Alq

3

as an electronic transport layer in this structure.Little diffe-rence of the maximum peak of ELspectra between two Diodes is found

which is 432 nm in DiodeⅠand 433 nm in DiodeⅡ

a current efficiency of 2.5 cd/Awith the Commission Internationale d’Eclairage (CIE) coordinates of (

x

=0.15

y

=0.06) is got in DiodeⅡ while only a current efficiency of 1.5 cd/Awith CIEof (

x

=0.15

y

=0.10) is found in DiodeⅠ.It is supposed that the purification of the ADNrough material has a positive effect on the ELcharacteristics of the OLED

meanwhile with fewer impacts on the PLspectra.Therefore the purification can be improved the performance of OLED greatly.