TECHNOLOGY FOCUS - ELECTRONICS - Preferred Element: A light emitting element has light emitting layer (A) and light emitting layer (B) containing stilbene derivative between pair of electrodes (102,104). The stilbene derivative emits luminescent color of light such as white luminescence by applying a voltage between pair of electrodes. Preferred Device: An electronic device such as LED has a display portion which is a controller to control light emission of the light emitting element.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (disclosed): A triphenyl phosphonium salt of formula (1a) and benzaldehyde derivative of formula (1b) were halogenated with benzyl halide of formula (1c) in presence of sodium carbonate to obtain halogenated stilbene derivative of formula (1d). The obtained compound and diarylamine of formula: Ar1-NH-Ar2 were coupled in presence of sodium carbonate and palladium acetate to obtain stilbene derivative (1).X1,X2=bromine or iodine;andR1-R3,Ar1,Ar2=same as defined above.Preferred Compound: The stilbene derivative is preferably of formulae (2)-(15).R4-R15=H or tert-butyl group;andAr1-Ar5=6-25C aryl group. SPECIFIC COMPOUNDS - 144 specific stilbene derivatives are disclosed. E.g. Biphenyl-4-yl-(4-((E)-2-(4-tert-butyl-phenyl)-vinyl)-phenyl)-phenyl-amine of formula (I), (4-((E)-2-(4-tert-butyl-phenyl)-vinyl)-phenyl)-diphenyl-amine, (4-((E)-2-(4-tert-butyl-phenyl)-vinyl)-phenyl)-di-p-tolyl-amine, (4-((E)-2-(4-tert-butyl-phenyl)-vinyl)-phenyl)-di-m-tolyl-amine and (4-((E)-2-(4-tert-butyl-phenyl)-vinyl)-phenyl)-naphthalen-2-yl-phenyl-amine.    EXAMPLE - 4-Bromo benzyl bromide (25.36 g) and acetone (100 mL) were stirred with triphenyl phosphine (29.3 g) at room temperature for 1 day, and filtered to obtain white powder of 4-bromo benzyl triphenyl phosphonium bromide. The obtained compound (15 g) and 4-tert-butyl benzaldehyde (7.12 g) were stirred with tetrahydrofuran (150 mL) and tert-butoxy potassium (3.9 g), filtered and washed with methanol to obtain (E)-4-bromo-4'-tert-butyl stilbene. The obtained compound (2.75 g), potassium carbonate (3.62 g), palladium acetate (0.02 g) and biphenyl-4-yl-phenyl-amine (2.14 g) were heated at 120 degrees C for 10 hours in xylene (40 mL) and tri(tert-butyl)phosphine (0.53 g), filtered and dried to obtain biphenyl-4-yl-(4-((E)-2-(4-tert-butyl-phenyl)-vinyl)-phenyl)-phenyl-amine (I) (2.42 g).