Blue emitting internal junction organic electroluminescent devic

Details Blue emitting internal junction organic electroluminescent devic Blue emitting internal junction organic electroluminescent devic

1991-08-01

1992-09-29

Willis, Jr., Prince

Electric lamp and discharge devices

With luminescent solid or liquid material

Solid-state type

25230116, H05B 3326

Patent

active

051516292

ABSTRACT:
An internal junction organic electroluminescent device is disclosed comprised of, in sequence, an anode, an organic hole injecting and transporting zone, an organic electron injecting and transporting zone, and a cathode. The organic electron injecting and transporting zone is comprised of an electron injecting layer in contact with the cathode and, interposed between the electron injecting layer and the organic hole injecting and transporting zone, a blue emitting luminescent layer comprised of a bis(R.sup.s -8-quinolinolato) aluminum(III)-.mu.-oxo-bis(R.sup.s -8-quinolinolato)- aluminum(III), where R.sup.s substituents are chosen to block the attachment of more than two substituted 8-quinolinolato ring nuclei to any one aluminum atom. Increased operating stability and device emission at even shorter blue wavelengths can be realized by the incorporation of a pentacarbocyclic aromatic fluorescent dye.

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Kushi et al, "The Crystal and Molecular Structure of Bis(2-methyl-8-quinolinolato)aluminum(III)-.mu.-oxo-bis(2-methyl-8-quinoli nolato)aluminium(III)", J. Amer. Chem. Soc., 92(1), pp. 91-96 (1970).

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