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Organic thin film electroluminescent device

  • US 5,858,562 A
  • Filed: 10/13/1995
  • Issued: 01/12/1999
  • Est. Priority Date: 10/13/1994
  • Status: Expired due to Term
First Claim
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1. An organic thin film electroluminescent device comprising:

  • an anode;

    a hole transport layer in contact with said anode, the hole transport layer having a first energy band gap;

    a potential barrier layer in contact with the hole transport layer, said potential barrier layer having a second energy band gap which is larger than said first energy band gap;

    a light emission layer in contact with said potential barrier layer, said light emission layer having a third energy band gap which is smaller than said second energy band gap; and

    a cathode in contact with said light emission layer, wherein the hole transport layer is made of a material containing at least a ditriphenylaminestyryl derivative expressed by the following formula;

    ##STR1377## where A is one selected from the group consisting of substituted alkylidene groups having not less than 10 carbon atoms, non-substituted alkylidene groups having not less than 10 carbon atoms, cycloalkylidene groups, oxygen atom, sulfur atom, substituted amino groups and non-substituted amino groups;

    where Ar1, Ar3, Ar4 and Ar5 are one selected from the group consisting of substituted arylene groups and non-substituted arylene groups;

    where Ar2 and Ar6 are one selected from the group consisting of substituted aryl groups and non-substituted aryl groups; and

    where X and Y are substituted groups expressed by the formula;

    ##STR1378## where Ar7 and Ar8 are one selected from the group consisting of substituted aryl groups and non-substituted aryl groups; and

    where R1 is one selected from the group consisting of hydrogen atom, halogen atom, hydroxyl groups, substituted amino groups, non-substituted amino groups, substituted alkoxy groups, non-substituted alkoxy groups, substituted alkyl groups having 1-6 carbon atoms, and non-substituted alkyl groups having 1-6 carbon atoms.

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