The development of organic electroluminescence (EL) materials has attracted much attention from academic and industrial groups due to their potential for application in full-colour flat panel displays.The dis-plays have many merits

such as low operating voltage

wide viewing angle

fast video response

and so on. The three primary colors

red

green

and blue

are essential to achieve full color displays.Although the red and green EL materials seem to have attained sufficiently high efficiencies and lifetimes for commercial applications

many challenges remain for improvement in the blue spectral region in terms of efficiency

durability in air

and spectral stability (color purity).In recent years

polytluorene and its derivatives have been exten-sively studied for blue LEDs due to their wonderful performance in organic electroluminescence

exceptionally high solubility

high photoluminescence quantum yields in the solid state

good charge transport properties and easy designing synthetic route.So they are very promising candidates for blue Organic Light-Emitting Diodes (OLEDs)

and can be used as light-emitting layers

hole-transporting layers

hole buffer layers

etc.

This paper reviews the development of polyfluorene and its derivatives used in OLEDs

it is divided in four parts. The first part is the background and the basic principle of organic electroluminescence.The second part intro-duces the blue

red

green

and white light-emitting polyfluorene and its derivatives

and the common synthe-sis methods including paUadium (0)-mediated Suzuki polycondensation

Ni(0)-mediated polymerization

Gilch polymerization method

Ullmann condensation

and Yamamoto polycondensation

etc.

The third part reviews the development of devices based on polyfluorene and its derivatives

including doping EL devices

exciplex emitting OLEDs

and the influence of structure of EL devices on the EL performance.The last one gives a prospect of the development and application of the organic ehctroluminescence devices.