Organic electroluminescence material and electroluminescence device using the same
a technology of electroluminescence and electroluminescence material, which is applied in the direction of luminescnet screens, discharge tubes, other domestic articles, etc., can solve the problems of deteriorating the function of the device, failing to give the device which can continuously emit sufficient bright light, and the structure showing insufficient improvement in the stability of the devi
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synthesis example 1
[0095]
[0096] N,N-dimethylformamide and 3,3′,3″-trimethyltriphenylamine (shown by the formula (i)) were put in an ice-cooled three-necked flask equipped with a drop funnel, a nitrogen gas leading pipe and a reflux condenser, and stirred in a nitrogen atmosphere, to which phosphorus oxychloride was slowly added dropwise by the drop funnel. On completion of the addition, the temperature of the mixture was raised upto 80° C. slowly and kept 80° C. for 10 hours with stirring. After on completion of the reactions water was added thereto, the mixture was stirred for 15 min. The mixture was purified by the common method, to obtain 3,3′,3″-trimethyl-4,4′,4″-triformyltriphenylamine (shown by the formula (ii)).
[0097] 4-chloromethyl-4′,4″-dimethyltriphenylamine (shown by the formula (iii)) and triethyl phosphite were put in a three-necked flask equipped with a reflux condenser, to which toluene was added and heated with stirring for 8 hours under reflux. The mixture was purified by the common...
synthesis example 2
[0099]
[0100] 3-bromobenzyl chloride shown by the formula (vi) and triethyl phosphite were put in a three-necked flask equipped with a reflux condenser, to which toluene was added and heated with stirring for 8 hours under reflux. The mixture was purified by common method, to obtain diethyl 3-bromobenzylphosphonate shown by the formula (vii).
[0101] Diethyl 3-bromobenzylphosphonate shown by the formula (vii) was reacted with 4-formyltriphenylamine shown by the formula (viii) in a solution of N,N-dimethylformamide suspended with hydrogenated sodium at 40° C. for 40 hours. The mixture was purified by the common method, to obtain 4-(3-bromostyryl)triphenylamine shown by the formula (ix).
[0102] 4-(3-bromostyryl)triphenylamine (shown by the formula (ix)) and tetrahydrofuran were put in a three-necked flask equipped with a drop funnel and dryer tube, and stirred. The mixture was cooled to −78° C., to which a hexane solution of butyl lithium was added dropwise by a drop funnel. The temper...
example 1
[0103] Referring to FIG. 2(a), a glass substrate 11 was coated with a thin film of ITO (indium tin oxide) as the anode 12, having a resistivity of 20 Ω / □, by sputtering, the compound 1 shown by Table I-1 to a thickness of 50 nm as the hole transport layer 13 by resistance heating vacuum deposition, tris-(8-hydroxquinolinol)aluminum (compound (a)) to a thickness of 60 nm as the light-emitting layer 14 also by resistance heating vacuum deposition, and finally MgAg (deposition rate ratio; 10:1) to a thickness of 150 nm as the cathode 16 also by resistance heating vacuum deposition, in this order.
[0104] Very bright green color planar-emission was performed from the light-emitting layer of tris-(8-hydroxquinolinol)aluminum Brightness of the light was 203 cd / m2 initially at a constant current density of 10 mA / cm2 in a dried nitrogen atmosphere, and 147 cd / m2 after 1000 hours drive, by which is meant that this organic EL device of the present invention is more durable than those prepared...
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