Blue emitting internal junction organic electroluminescent device (I)
First Claim
1. An internal junction organic electroluminescent device comprised of, in sequence, an anode, an organic hole injecting and transporting zone, an organic electron injecting and transporting zone, and a cathode,characterized in that said organic electron injecting and transporting zone is comprised ofan 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 charge accepting compound of the formula:
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space="preserve" listing-type="equation">(R.sup.s --Q).sub.2 --Al--O--Al--(Q--R.sup.s).sub.2 whereQ in each occurrence represents a substituted 8-quinolinolato ring nucleus andRs represents an 8-quinolinolato ring substituent chosen to block sterically the attachment of more than two substituted 8-quinolinolato ring nuclei to any one aluminum atom.
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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(Rs -8-quinolinolato) aluminum(III)-μ-oxo-bis(Rs -8-quinolinolato)- aluminum(III), where Rs 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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Citations
25 Claims
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1. An internal junction organic electroluminescent device comprised of, in sequence, an anode, an organic hole injecting and transporting zone, an organic electron injecting and transporting zone, and a cathode,
characterized in that said 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 charge accepting compound of the formula: -
space="preserve" listing-type="equation">(R.sup.s --Q).sub.2 --Al--O--Al--(Q--R.sup.s).sub.2where Q in each occurrence represents a substituted 8-quinolinolato ring nucleus and Rs represents an 8-quinolinolato ring substituent chosen to block sterically the attachment of more than two substituted 8-quinolinolato ring nuclei to any one aluminum atom. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification