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US 6,583,583 B1Granted
Organic el material
AssigneeNippon Steel Chemical Co., Ltd.
InventorsMahito Soeda, Hiroshi Miyazaki, Tohru Saito
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AssigneeNippon Steel Chemical Co., Ltd.
InventorsMahito Soeda, Hiroshi Miyazaki, Tohru Saito
Estimating the term…
This invention relates to an organic aluminum complex manifesting excellent performance when used in an organic EL device and to a process for preparing said complex. The organic EL material of this invention comprises an organoaluminum complex which generates heat of 2 J/g or less In the range of 350-400° C. and absorbs heat of 70-120 j/g, in the range of 400-450° C., with the maximum of an endothermic peak being located near 420° C. on analysis by differential scanning calorimetry. The organic EL material can be obtained by refining the raw material (8-quinolinolato)aluminum by sublimation under reduced pressure of 20 Torr or less while maintaining the temperature in the sublimation zone above 300° C. and below 420° C. and the temperature in the product recovery zone above 100° C. and below 250° C.
An organic EL material comprising tris (8-quinolinolato)aluminum which is characterized by generating heat of 2 J/g or less in the range of 350-400° C. and absorbing heat of 70-120 J/g in the range of 400-450° C. with the maximum of an endothermic peak being located near 420° C. on analysis by differential scanning calorimetry in a stream of nitrogen.
A process for refining tris(8-quinolinolato)aluminum for use in an organic EL material which comprises refining the raw material tris(8-quinolinolato)aluminum by sublimation under reduced pressure of 10 Torr or less while maintaining the temperature in the sublimation zone above 300° C. and below 420° C. and the temperature in the principal zone of the product recovery zone above 100° C. and below 250° C.
Dependencies are inferred from the claim text.