The study on organic electroluminescence devices(OELDs)have become one of the fascinating fields recently.Compared with inorganic electroluminescence devices

OELDs possess excellent features such as high efficiency

high brightness

rich color

wide visual view

low energy consumption

fast response

low cost

low-voltage dri-ving matching integrate circuit

large-area full-color display

excellent mechanical properties and so on.As the foundation of OLEDs

organic electroluminescent(OEL)materials are one of the key factors influencing the device performance.Therefore

organic electroluminescent(OEL)materials are also one of chemists' hot subjects in this field.In this promising field

many chemists are devoting themselves to investigating the synthesis techniques and photophysical behaviors of new and excellent electroluminescent materials.At present

OELDs have made great progress and developed for practicality and commodity

but their properties still be in the need of improvement in brightness

efficiency

lifetime

etc.The fluorene derivatives containing imino groups

N-(2

7-dibromo-9-fluorenylidene)aniline(NBFA)

4-methyl-N-(2

7-dibromo-9-fluorenylidene)aniline(MNBFA)and 4chloro-N-(2

7-dibromo-9-fluorenylidene)aniline(CNBFA)as novel organic electroluminescent compounds were synthesized by the reaction of 2

7-dibromofluorenone and corresponding aniline derivatives.The structures of the compounds were characterized by 1H NMR

IR and MS.The photophysical processes of the compounds were carefully investigated by UV-Vis absorption and fluorescence emission spectra.The results show that the emission spectra exhibited obvious solvent effects and functional group effects.The emitting intensities were quenched by diphenylketone(DPKT)

a quencher of electron acceptor

and gradually decreased with the increase of quencher.The quenching effect followed the Stern-Volmer equation well.The imino derivatives(NBFA

CNBFA

MNBFA)of 2

7-dibromofluorenone display not only a potential candidate as materials for organic electroluminescent devices

but also an intermediate for luminescent materials.