Organic electroluminescent device
First Claim
1. An organic electroluminescent device comprising:
- an electron transport layer which comprises a single layer of an 1,2,4-triazole derivative of the formula;
##STR14## wherein R1, R2, R3, R4 and R5 may be the same or different, each is hydrogen atom, alkyl, alkoxyl, aryl or aralkyl, and R1, R2, R3, R4 and R5 are not hydrogen atoms at the same time, or comprises the layer of the 1,2,4-triazole derivative and a layer of a tris(8-quinolinolato)aluminum (III) complex; and
a hole-transport luminescent layer in which at least one dye is molecularly dispersed in a disperse medium.
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Abstract
The first organic electroluminescent device is prepared by laminating the hole-transport luminescent layer 1 in which a dye is molecularly dispersed, and the electron-transport layer 2 containing a triazole derivative of the following formula (1). The second organic electroluminescent device has the layer containing the above triazole derivative. The third organic electroluminescent device wherein the layer containing the triazole derivative is interposed between the electron-transport layer and a hole-transport layer.
Every device is excellent in luminous efficiency, luminance and stability, realizing blue light emission, the multi-color displays and white light emission due to three primary colors. ##STR1## wherein the numeral references have the same meanings stated in specification.
79 Citations
8 Claims
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1. An organic electroluminescent device comprising:
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an electron transport layer which comprises a single layer of an 1,2,4-triazole derivative of the formula;
##STR14## wherein R1, R2, R3, R4 and R5 may be the same or different, each is hydrogen atom, alkyl, alkoxyl, aryl or aralkyl, and R1, R2, R3, R4 and R5 are not hydrogen atoms at the same time, or comprises the layer of the 1,2,4-triazole derivative and a layer of a tris(8-quinolinolato)aluminum (III) complex; anda hole-transport luminescent layer in which at least one dye is molecularly dispersed in a disperse medium. - View Dependent Claims (2, 3, 4)
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5. An organic electroluminescent device having at least a layer of a 1,2,4-triazole derivative of the formula:
- ##STR15## wherein R1, R2, R3, R4 and R5 may be the same or different, and each is a member selected from the group consisting of hydrogen, alkyl, alkoxyl, aryl and aralkyl, with the proviso that R1, R2, R3, R4 and R5 are not all hydrogen at the same time.
- View Dependent Claims (6, 7)
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8. An organic electroluminescent device comprising:
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a hole-transport layer; an electron-transport layer; and a carrier-transport control layer being interposed between the hole-transport layer and the electron-transport layer, the carrier-transport control layer being composed of a 1,2,4 -triazole derivative of the general formula (1), transporting at least either of holes and electrons.
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Specification