US 7,196,360 B2 · Light emitting device

Abstract

A light emitting device and electronic equipment having a long life at a low electric power consumption are provided. A hole transporting region composed of a hole transporting material, an electron transporting region composed of an electron transporting material, and a mixture region in which both the hole transporting material and the electron transporting material are mixed at a fixed ratio are formed within an organic compound film. Regions having a concentration gradient are formed between the mixture region and carrier transporting regions until the fixed ratio is achieved. In addition, by doping a light emitting material into the mixture region, functions of hole transportation, electron transportation, and light emission can be respectively expressed while all of the interfaces existing between layers of a conventional lamination structure are removed. Organic light emitting elements having low electric power consumption and a long life can thus be provided, and light emitting devices and electronic equipment can be manufactured using the organic light emitting elements.

Claims31

Dependent claims

A light emitting device comprising an organic light emitting element, the organic light element having:

an anode;
a cathode;
an organic compound film containing a hole transporting material and an electron transporting material;
wherein the organic compound film has a structure comprising in a direction from the anode to the cathode:
a hole transporting region comprising the hole transporting material;
a first concentration change region in which the proportion of the electron transporting material increases gradually until a ratio between the hole transporting material and the electron transporting material becomes x:y (where x and y are positive constants);
a mixture region containing the hole transporting material and the electron transporting material at the ratio of x:y;
a second concentration change region in which the proportion of the electron transporting material gradually increases further from the x:y ratio;
and
an electron transporting region comprising the electron transporting material;
and
wherein a light emitting region, into which a light emitting material for performing light emission is added, is formed within the mixture region.

9 more elements

A light emitting device comprising an organic light emitting element, the organic light element having:

an anode;
a cathode;
a hole injecting region formed contacting the anode;
an organic compound film containing a hole transporting material and an electron transporting material;
wherein
the organic compound film has a structure comprising in a direction from the anode to the cathode:
a hole transporting region comprising the hole transporting material;
a first concentration change region in which the proportion of the electron transporting material increases gradually until a ratio between the hole transporting material and the electron transporting material becomes x:y (where x and y are positive constants);
a mixture region containing the hole transporting material and the electron transporting material at the ratio of x:y;
a second concentration change region in which the proportion of the electron transporting material gradually increases further from the x:y ratio;
and
an electron transporting region comprising the electron transporting material;
wherein a light emitting region, into which a light emitting material for performing light emission is added, is formed within the mixture region.

10 more elements

A light emitting device comprising an organic light emitting element, the organic light element having:

an anode;
a cathode;
an electron injecting region formed contacting the cathode;
and
an organic compound film containing a hole transporting material and an electron transporting material,
wherein
the organic compound film has a structure comprising in a direction from the anode to the cathode:
a hole transporting region comprising the hole transporting material;
a first concentration change region in which the proportion of the electron transporting material increases gradually until a ratio between the hole transporting material and the electron transporting material becomes x:y (where x and y are positive constants);
a mixture region containing the hole transporting material and the electron transporting material at the ratio of x:y;
a second concentration change region in which the proportion of the electron transporting material gradually increases further from the x:y ratio;
and
an electron transporting region comprising the electron transporting material;
and
wherein a light emitting region, into which a light emitting material for performing light emission is added, is formed within the mixture region.

12 more elements

A light emitting device comprising an organic light emitting element, the organic light element comprising:

an anode;
a cathode;
a hole injecting region formed contacting the anode;
an electron injecting region formed contacting the cathode;
and
an organic compound film containing a hole transporting material and an electron transporting material;
wherein
the organic compound film has a structure which comprises in a direction from the anode to the cathode:
a hole transporting region comprising the hole transporting material;
a first concentration change region in which the proportion of the electron transporting material increases gradually until a ratio between the hole transporting material and the electron transporting material becomes x:y (where x and y are positive constants);
a mixture region containing the hole transporting material and the electron transporting material at the ratio of x:y;
a second concentration change region in which the proportion of the electron transporting material gradually increases further from the x:y ratio;
and
an electron transporting region comprising the electron transporting material, and
wherein a light emitting region, into which a light emitting material for performing light emission is added, is formed within the mixture region.

12 more elements

A cellular phone comprising a main body, an audio output portion, an audio input portion, a display portion including a light emitting device, operation switches,

and an antenna:
said light emitting device comprising an organic light emitting element, the organic light element having:
an anode;
a cathode;
an organic compound film containing a hole transporting material and an electron transporting material;
wherein the organic compound film has a structure comprising in a direction from the anode to the cathode:
a hole transporting region comprising the hole transporting material;
a first concentration change region in which the proportion of the electron transporting material increases gradually until a ratio between the hole transporting material and the electron transporting material becomes x:y (where x and y are positive constants);
a mixture region containing the hole transporting material and the electron transporting material at the ratio of x:y;
a second concentration change region in which the proportion of the electron transporting material gradually increases further from the x:y ratio;
and
an electron transporting region comprising the electron transporting material;
and
wherein a light emitting region, into which a light emitting material for performing light emission is added, is formed within the mixture region.

11 more elements

An audio comprising a main body, a display portion including a light emitting device, operation switches, and an antenna:

said light emitting device comprising an organic light emitting element, the organic light element having:
an anode;
a cathode;
an organic compound film containing a hole transporting material and an electron transporting material;
wherein the organic compound film has a structure comprising in a direction from the anode to the cathode:
a hole transporting region comprising the hole transporting material;
a first concentration change region in which the proportion of the electron transporting material increases gradually until a ratio between the hole transporting material and the electron transporting material becomes x:y (where x and y are positive constants);
a mixture region containing the hole transporting material and the electron transporting material at the ratio of x:y;
a second concentration change region in which the proportion of the electron transporting material gradually increases further from the x:y ratio;
and
an electron transporting region comprising the electron transporting material;
and
wherein a light emitting region, into which a light emitting material for performing light emission is added, is formed within the mixture region.

10 more elements

Dependencies are inferred from the claim text.

Light emitting device

Life of this patent

Light emitting device

Life of this patent

Abstract

Claims31