US 5,853,905 A · Efficient single layer electroluminescent device

Abstract

An electroluminescent device is composed of a body of small molecule organic material(s) sandwiched between a first and a second electrode, wherein a layer of first insulative material is placed between the body of small molecule organic material(s) and the first electrode, and an optional layer of second insulative material is placed between the body of small molecule organic material(s) and the second electrode. The layer of first insulative material has a thickness which allows first carriers from the first electrode to tunnel therethrough and the second insulative material has a thickness which allows second carriers from the second electrode to tunnel therethrough. Further, the layer of first insulative material provides a barrier to the second carriers and the layer of second insulative material provides a barrier to the first carriers.

Claims34

Dependent claims

An electroluminescent device comprising:

a body of small molecule organic material(s) sandwiched between a first electrode and a second electrode;
a layer of first insulative material placed between the body of small molecule organic material and the first electrode, and a layer of second insulative material placed between the body of small molecule organic material and the second electrode;
the body of organic material having a bandgap between 1.5 and 3.5 eV;
the layer of first insulative material having a thickness which allows first carriers from the first electrode to tunnel therethrough and the second insulative material having a thickness which allows second carriers from the second electrode to tunnel therethrough;
and
the layer of first insulative material providing a barrier to the second carriers and the layer of second insulative material providing a barrier to the first carriers.

3 more elements

An electroluminescent device comprising:

a body of small molecule organic material sandwiched between a first electrode and a second electrode;
a layer of insulative material placed between the body of small molecule organic material and the first electrode;
the body of organic material having a bandgap between 1.5 and 3.5 eV;
and
the layer of insulative material having a thickness which allows first carriers from the first electrode to tunnel therethrough and also provides a barrier to the second carriers.

2 more elements

An electroluminescent device comprising:

a body of small molecule organic material having a bandgap between 1.5 and 3.5 eV sandwiched between a first electrode and a second electrode;
a layer of insulative material placed between the body of small molecule organic material and the second electrode;
and
the layer of insulative material having a thickness which allows second carriers from the second electrode to tunnel therethrough and also provides a barrier to the first carriers from the first electrode.

1 more element

Dependencies are inferred from the claim text.

Efficient single layer electroluminescent device

Life of this patent

Efficient single layer electroluminescent device

Life of this patent

Abstract

Claims34