Organic electroluminescent device and light-emitting material

Details Organic electroluminescent device and light-emitting material Organic electroluminescent device and light-emitting material

H - Electricity

01

L

H01L 51/50 (2006.01)

Patent

CA 2380067

The invention relates to a light-emitting material and organic electroluminescent (EL) device having high emitting efficiency, in which two organic compounds that contribute to the light emission are used. These two organic compounds have a relationship among energy levels in the excited state, such that an energy transfer takes place from the excited triplet state of one compound to the excited triplet state of the other compound. The organic EL device and light-emitting material of the invention have high emitting efficiency, high luminance and durability, can surpass the marginal value of 25 % in the internal quantum efficiency conventionally acknowledged for the light-emitting materials used in organic EL devices, and can be applicable to all emission colors considered necessary for a display.

L'invention se rapporte à une matière luminescente et à un dispositif électroluminescent (EL) organique doté d'un grand pouvoir de luminescence, dans lequel sont utilisés deux composés organiques qui contribuent à la luminescence. Ces deux composés organiques possèdent une relation entre les niveaux d'énergie dans l'état excité, qui est telle qu'un transfert d'énergie a lieu depuis l'état de triplet excité d'un composé vers l'état de triplet excité de l'autre composé. Le dispositif EL organique et la matière luminescente de l'invention possèdent un fort pouvoir luminescent, une forte luminance et une grande durabilité, ils peuvent dépasser la valeur marginale de 25 % de l'efficacité quantique interne conventionnellement reconnue aux matières luminescentes utilisées dans les dispositifs EL organiques, et ils peuvent s'appliquer à toutes les couleurs d'émission considérées nécessaires à un afficheur.

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