Organic electroluminescent (OEL) materials have recently attracted much interest due to their intriguing physical properties and potential applications to flat panel display. Blue EL emitter is essential for the development of a full color display based either on the "color changing medium" technology or the RGB filtered white emission. Many blue organic EL materials have been investigated by a number of researchers. Among them

the most promising ones are DSA derivatives. These classes of compounds generally offer many attractive properties such as high thermal stability and good film forming ability

etc. In this paper

the DSA derivative blue emitting material 4

4' bis(2

2 diphenylvinyl) 1

1' biphenyl

i.e .

DPVBi is synthesized via the Wittig Horner reaction

and determined by IR

1

H NMR and elementary analysis. The photoluminescence(PL) of this compound in solid film and EL have been studied. DPVBi is intense blue fluorescent material and have a good film forming ability. The excitation and emission spectra of the vacuum deposited film of DPVBi have been studied. The emission spectrum shows the emission lies in the blue region with a peak at 460nm under the excitation of 360nm light. A blue organic light emitting diode(OLED) with the structure ITO/CuPc/NPB/DPVBi/Alq

3

/LiF/Al is studied. The EL spectrum of the device is similar to the PL spectrum of single layer DPVBi

indicating that the emission from the device resulted from the same excited state of the DSA derivative. The CIE chromaticity coordinates of the device are x =0.15

y =0.16

showing a very good blue purity. For the blue device

maximum luminance

the luminance under current density of 20mA/cm

2

and luminous efficiency are 4373cd/m

2

434cd/m

2

and 1.24lm/W

respectively. Particularly

it can be found that the CIE chromaticity coordinates of the device can keep better stability all the time with increasing current density as well as showing a very good blue purity. Because the stability of chromaticity is one of the most important factors to practical application of OLEDs

and DPVBi is a stable blue light emitter

it is suitable for applications to flat panel display.