Organic thin-film EL device

• US 5,093,691 A
• Filed: 05/18/1990
• Issued: 03/03/1992
• Est. Priority Date: 05/19/1989
• Status: Expired due to Term

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: NEC Corporation
• Inventors: Ishiko, Masayasu, Utsugi, Koji
• Primary Examiner(s): James, Andrew J.
• Assistant Examiner(s): BOWERS, COURTNEY
• Application Number:
  US07/525,398
• Time in Patent Office: 655 Days
• Field of Search: 357/8, 357/504, 357/4, 313/503, 313/506, 313/507
• US Class Current: 257/40
• CPC Class Codes: C09K 11/06 containing organic luminescent materials
• CPC Class Codes: H05B 33/14 characterised by the chemical or physical composition or the arrangement of the electroluminescent material , or by the simultaneous addition of the electroluminescent material in or onto the light source

Abstract

An organic thin-film electroluminescence (=EL) device is provided. This device includes as a main constituent of an organic luminescent thin-film layer sandwiched between a couple of electrodes at least one of which is transparent, a naphthalimide derivative represented by the formula (I): ##STR1## wherein R₁, R₂ and R₃ are identical or different from each other and are selected from the group consisting of hydrogen, an alkyl group, an aryl group, a substituted alkyl group, a substituted aryl group, an alkoxyl group, an amino group and an acylamino group.

Claims

1. An organic thin-film EL device comprising at least one organic luminescent thin-film layer sandwiched between a couple of electrodes at least one of which electrodes is transparent;

said organic luminescent thin-film layer contains as a main constituent a naphthalimide derivative represented by the formula (I);

##STR3## wherein R₁, R₂ and R₃ are identical or different from each other and are selected from the group consisting of hydrogen, an alkyl group, an aryl group, a substituted alkyl group, a substituted aryl group, an alkoxyl group, an amino group and an acylamino group.

2. The organic thin-film EL device according to claim 1, which includes at least one organic electric-charge transporting thin-film layer sandwiched between the electrodes, in addition to the at least one organic luminescent thin-film layer, to give a multi-layer structure.

3. The organic thin-film EL device according to claim 2, wherein the at least one organic electric-charge transporting thin-film layer consists of a hole injection layer made of an organic hole transporting material to give a double-layer structure.

4. The organic thin-film EL device according to claim 2, wherein the at least one organic electric-charge transporting thin-film layer consists of a hole injection layer made of an organic hole transporting material and an electron injection layer made of an organic electron transporting material to give a triple-layer structure.

5. The organic thin-film EL device according to claim 1 wherein the naphthalimide derivative is selected from the group consisting of:

N-(2'"'"',4'"'"'-xylyl)-4-aminonaphthalimide,

4-aminonaphthalimide,

N-methyl-4-aminonaphthalimide,

N-ethyl-4-aminonaphthalimide,

N-propyl-4-aminonaphthalimide,

N-n-butyl-4-aminonaphthalimide,

4-acetylaminonaphthalimide,

N-methyl-4-acetylaminonaphthalimide,

N-ethyl-4-acetylaminonaphthalimide,

N-propyl-4-acetylaminonaphthalimide,

N-n-butyl-4-acetylaminonaphthalimide,

N-methyl-4-methoxynaphthalimide,

N-ethyl-4-methoxynaphthalimide,

N-propyl-4-methoxynaphthalimide,

N-n-butyl-4-methoxynaphthalimide,

N-methyl-4-ethoxynaphthalimide,

N-ethyl-4-ethoxynaphthalimide,

N-propyl-4-ethoxynaphthalimide, and

N-n-butyl-4-ethoxynaphthalimide.