Green-emitting organometallic complexes for use in light emitting devices

• US 5,486,406 A
• Filed: 11/07/1994
• Issued: 01/23/1996
• Est. Priority Date: 11/07/1994
• Status: Expired due to Term

• Current Assignee: Universal Display Corporation
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Shi, Song Q.
• Primary Examiner(s): Ryan, Patrick J.
• Assistant Examiner(s): JEWIK, PATRICK
• Application Number:
  US08/334,999
• Time in Patent Office: 442 Days
• Field of Search: 428/457, 428/209, 428/690, 428/917, 313/504, 252/301.16, 252/301.22
• US Class Current: 428/209
• 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
• CPC Class Codes: Y10S 428/917 Electroluminescent
• CPC Class Codes: Y10T 428/24917 including metal layer
• CPC Class Codes: Y10T 428/31678 Of metal

Abstract

A new class of organometallic complexes for use in electroluminescent (EL) devices and a method of preparation are disclosed. The organometallic complexes are prepared by mixing organic ligands with metal salts in the presence of a base and a layer is formed in an EL device by vacuum evaporation. The organometallic material in the EL device serves as either an electron transporting layer or a light emission layer, or both.

Claims

1. An organic light emitting device comprising:

a first conductive layer;

a layer of first carrier transporting and second carrier blocking material positioned on the first conductive layer;

a layer of organometallic material positioned on the layer of first carrier transporting and second carrier blocking material and having the following general formula;

##STR4## where;

M² is a divalent metal ion, and

R¹ to R⁸ represent substitution possibilities at each position and each represent hydrogen or hydrocarbon groups or functional groups;

a layer of second carrier transporting and first carrier blocking material positioned on the layer of organometallic material; and

a second conductive layer positioned on the layer of second carrier transporting and first carrier blocking materials.

2. An organic light emitting device as claimed in claim 1 wherein the first carriers are holes and the second carriers are electrons.

3. An organic light emitting device as claimed in claim 1 wherein the first conductive layer is p conductivity and the second conductive layer is n conductivity.

4. An organic light emitting device as claimed in claim 1 wherein one of the first and second conductive layers are transparent to light emitted by the organometallic emissive layer.

5. An organic light emitting device comprising:

a glass substrate having a substantially planar surface;

a first conductive transparent layer positioned on the glass substrate

a layer of hole transporting and electron blocking material positioned on the first conductive layer;

a layer of organic active emitter material deposited on the hole transporting and electron blocking layer;

a layer of organometallic complex material positioned on the layer of organic active emitter material as electron transporting and hole blocking material, the organometallic complex material having the general formula;

##STR5## where;

M² is a divalent metal ion, and

R¹ to R⁸ represent substitution possibilities at each position and each represent hydrogen or hydrocarbon groups or functional groups; and

a second conductive layer positioned on the layer of organometallic complex material.