White light emitting organic electroluminescent device and method for fabricating the same
First Claim
1. A white light emitting organic electroluminescent organic (EL) device comprising:
- a substrate;
an anode formed on said substrate;
at least one hole transporting layer formed on said anode;
at least one luminescent layer formed on said hole transporting layer, wherein a first dopant is doped into said luminescent layer;
at least one electron transporting layer formed on said luminescent layer, wherein a second dopant is doped into said electron transporting layer; and
, a cathode formed on said electron transporting layer;
wherein a first light is emitted by said first dopant, a second light is emitted by said second dopant, and a third light is emitted by said luminescent layer when the device is applied with a bias voltage; and
, wherein the luminescence intensity of said second light and said third light is proportional to the volume ratio of said first dopant to said luminescent layer.
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Abstract
The present invention discloses a white light emitting organic electroluminescent (EL) device and a method for fabricating the same. The device comprises: a substrate; an anode formed on the substrate; at least one hole transporting layer formed on the anode; at least one luminescent layer (DPVBi) formed on the hole transporting layer, wherein a first dopant (DCM2) is doped into the luminescent layer; at least one electron transporting layer formed on the luminescent layer, wherein a second dopant (C6) is doped into the electron transporting layer; and a cathode formed on the electron transporting layer; wherein a first light (red) is emitted by the first dopant, a second light (green) is emitted by the second dopant, and a third light (blue) is emitted by the luminescent layer when the device is applied with a bias voltage.
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Citations
9 Claims
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1. A white light emitting organic electroluminescent organic (EL) device comprising:
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a substrate;
an anode formed on said substrate;
at least one hole transporting layer formed on said anode;
at least one luminescent layer formed on said hole transporting layer, wherein a first dopant is doped into said luminescent layer;
at least one electron transporting layer formed on said luminescent layer, wherein a second dopant is doped into said electron transporting layer; and
,a cathode formed on said electron transporting layer;
wherein a first light is emitted by said first dopant, a second light is emitted by said second dopant, and a third light is emitted by said luminescent layer when the device is applied with a bias voltage; and
,wherein the luminescence intensity of said second light and said third light is proportional to the volume ratio of said first dopant to said luminescent layer. - View Dependent Claims (2, 3)
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4. A white light emitting organic electroluminescent organic (EL) device comprising:
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a substrate;
an anode formed on said substrate;
at least one hole transporting layer formed on said anode;
at least one luminescent layer formed on said hole transporting layer, wherein a first dopant is doped into said luminescent layer;
at least one electron transporting layer formed on said luminescent layer, wherein a second dopant is doped into said electron transporting layer; and
,a cathode formed on said electron transporting layer;
wherein a first light is emitted by said first dopant, a second light is emitted by said second dopant, and a third light is emitted by said luminescent layer when the device is applied with a bias voltage; and
,wherein the luminescence intensity of said third light is proportional to the thickness of said luminescent layer and the luminescence intensity of said second light is in inverse proportion to the thickness of said luminescent layer.
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5. A white light, organic electroluminescent (EL) device, comprising:
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a substrate;
an anode formed on said substrate;
at least one hole transporting layer formed on said anode;
at least one luminescent layer formed on said hole transporting layer, wherein a first dopant is doped into said luminescent layer;
at least one electron transporting layer formed on said luminescent layer, wherein a second dopant is doped into said electron transporting layer; and
a cathode formed on said electron transporting layer;
wherein a first light is emitted by said first dopant, a second light different in color from said first light is emitted by said second dopant, and a third light different in color from said second light is emitted by said luminescent layer when the device is applied with a bias voltage, said first light being red light, said second light being green light, and said third light being blue light.
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6. A white light organic electroluminescent (EL) device, comprising:
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a substrate;
an anode formed on said substrate;
at least one hole transporting layer formed on said anode;
at least one luminescent layer formed on said hole transporting layer, wherein a first dopant is doped into said luminescent layer, said luminescent layer being selected from the group consisting of;
DPVBi, Balq, PVK, Zn(ODZ)2, and a combination thereof;
at least one electron transporting layer formed on said luminescent layer, wherein a second dopant is doped into said electron transporting layer; and
a cathode formed on said electron transporting layer;
wherein a first light is emitted by said first dopant, a second light different in color from said first light is emitted by said second dopant, and a third light different in color from said second light is emitted by said luminescent layer when the device is applied with a bias voltage, said third light being blue light.
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7. A method for fabricating a white light emitting organic electroluminescent (EL) device, comprising the steps of:
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providing a substrate;
forming, in sequence from substrate up, an anode, at least one hole transporting layer, at least one luminescent layer, at least one electron transporting layer, and a cathode;
doping a first dopant into said luminescent layer; and
doping a second dopant into said electron transporting layer;
wherein a first light is emitted by said first dopant, a second light is emitted by said second dopant, and a third light is emitted by said luminescent layer when the device is applied with a bias voltage; and
,wherein said luminescent layer is DPVBi for emitting blue light, said first dopant is DCM2 for emitting red light, said second dopant includes a coumarin 6 dye material for emitting green light. - View Dependent Claims (8)
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9. A method for fabricating a white light emitting organic electroluminescent (EL) device, comprising the steps of:
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providing a substrate;
forming, in sequence from substrate up, an anode, at least one hole transporting layer, at least one luminescent layer, at least one electron transporting layer, and a cathode;
doping a first dopant into said luminescent layer; and
doping a second dopant into said electron transporting layer;
wherein a first light is emitted by said first dopant, a second light is emitted by said second dopant, and a third light is emitted by said luminescent layer when the device is applied with a bias voltage; and
,wherein the luminescence intensity of said second light and said third light depends on the thickness of said luminescence layer, wherein the luminescence intensity of said second light gets weaker and the luminescence intensity of said third light gets stronger as the thickness of said luminescent layer increases.
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Specification