Patent US2161706A successfully refreshed from Google Patents.
Patent CH190301A successfully refreshed from Google Patents.
US6366017B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Organic light emitting diodes with distributed bragg reflector
Assignee: Innolux Corp
•
Filing: 1999-07-14
•
Granted: 2002-04-02
•
Expires: 2019-07-14
Abstract
Abstract The present invention provides OLEDs having superior brightness, which can be formed on opaque substrates such as silicon, and methods for producing such OLEDs. OLEDs according to the invention comprise a reflective electrode on the substrate, an organic active layer which provides electroluminescence, an injection layer, and a transparent organic electrode. Light from the active layer which is initially directed backward is reflected by the reflective layer to increase the apparent brightness of the diode in the forward direction.
Inventors
- 👤 Homer Antoniadis
- 👤 Daniel B. Roitman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:04
CPC Classifications
H; H10; H10K; H10K59/00; H10K59/80; H10K59/805; H10K50/00; H10K50/80; H10K50/805; H10K50/85; H10K50/852; H10K59/875; H10K59/876; H10K2102/00; H10K2102/301; H10K2102/302; H10K2102/3023; H10K2102/3026; H10K85/00; H10K85/10; H10K85/111; H10K85/113; H10K85/1135; H10K85/114; H10K85/60; H10K85/631
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
110 words
An organic light emitting diode (OLED), comprising, in sequence: an opaque substrate; a reflective electrode; an organic active layer; a transparent injection layer; a transparent organic electrode; and a distributed Bragg reflector (DBR), wherein the active layer of the OLED emits light in response to a biasing voltage applied across the electrodes, a first portion of said light passing directly through the transparent injection layer and the transparent electrode, and a second portion of said light being reflected from the reflective electrode and subsequently transmitted through the transparent injection layer and the transparent electrode, and wherein the DBR acts to increase the emission of light in a substantially forward direction.
Claim 2
Dependent Claim
110 words
An organic light emitting diode (OLED), comprising, in sequence: an opaque substrate; a reflective electrode; an organic active layer; a transparent injection layer; a transparent organic electrode; and a distributed Bragg reflector (DBR), wherein the active layer of the OLED emits light in response to a biasing voltage applied across the electrodes, a first portion of said light passing directly through the transparent injection layer and the transparent electrode, and a second portion of said light being reflected from the reflective electrode and subsequently transmitted through the transparent injection layer and the transparent electrode, and wherein the DBR acts to increase the emission of light in a substantially forward direction.
Claim 3
Dependent Claim
23 words
The OLED of claim 1 , wherein the organic active layer comprises an organic hole transport layer and an organic electron transport layer.
Claim 4
Dependent Claim
31 words
The OLED of claim 2 , wherein the organic hole transport layer comprises a material selected from the group consisting of NPB, m-MTDATA, Pani, thiophenes, PEDOT:PSS, metal-base phthalocyanines and metal-free phthalocyanines.
Claim 5
Dependent Claim
32 words
The OLED of claim 2 , wherein the organic electron transport layer comprises a material selected from the group consisting of Alq 3 , poly(phenylene vinylene), polyfluorene, and derivatives and copolymers thereof.
Claim 6
Dependent Claim
28 words
The OLED of claim 1 , wherein the organic active layer comprises a material selected from the group consisting of poly(phenylene vinylene), polyfluorene, and derivatives and copolymers thereof.
Claim 7
Dependent Claim
31 words
The OLED of claim 1 , wherein the reflective electrode functions as an anode, the organic transparent electrode functions as a cathode, and the injection layer is an electron injection layer.
Claim 8
Dependent Claim
27 words
The OLED of claim 6 , wherein the anode comprises a material selected from the group consisting of platinum, palladium, iridium, gold, tungsten; nickel, silver, and aluminum.
Claim 9
Dependent Claim
31 words
The OLED of claim 6 , wherein the transparent organic cathode comprises a material selected from the group consisting of thiophenes, polyanilines, polyethylenedioxythiophenes, inorganic/organic composite materials, and mixtures and derivatives thereof.
Claim 10
Dependent Claim
32 words
The OLED of claim 6 , further comprising a conductive layer positioned between the anode and the active layer, the conductive layer acting to increase the effective work function of the anode.
Claim 11
Dependent Claim
48 words
The OLED of claim 9 , wherein the conductive layer comprises a material selected from the group consisting of indium tin oxide (ITO), indium zinc oxide, tin oxide, magnesium indium oxide, nickel tungsten oxide, nickel oxide, titanium nitride, and metals having work functions in excess of 4.0 eV.
Claim 12
Dependent Claim
30 words
The OLED of claim 1 , wherein the reflective electrode functions as a cathode, the transparent electrode functions as an anode, and the injection layer is a hole injection layer.
Claim 13
Dependent Claim
41 words
The OLED of claim 11 , wherein the cathode comprises a material selected from the group consisting of alkalis, alkaline earths, rare earth metals, conductive nitrides, CaO, Li 2 O, MgO, LiF, MgF 2 , CsF, CaF 2 , and TiN.
Claim 14
Dependent Claim
30 words
The OLED of claim 11 , wherein the transparent organic anode comprises a material selected from the group consisting of thiophenes, polyanilines, polyethylenedioxythiophenes, inorganic/organic composites, and mixtures and derivatives thereof.
Claim 15
Dependent Claim
28 words
The OLED of claim 11 , wherein the cathode comprises a reflective metal layer and a low work function layer having a work function less than 3.5 eV.
Claim 16
Dependent Claim
67 words
The OLED of claim 14 , wherein the reflective metal layer comprises a metal selected from the group consisting of platinum, palladium, iridium, gold, tungsten, nickel, silver, and aluminum, and the low work function layer comprises a material selected from the group consisting of alkalis, alkaline earths, rare earth metals, conductive nitrides, CaO, Li 2 O, MgO, LiF, MgF 2 , CsF, CaF 2 , and TiN.
Claim 17
Dependent Claim
148 words
An organic light emitting diode (OLED), comprising, in sequence: a substrate; a conductive buffer layer; a first electrode layer, the buffer layer enhancing conduction between the substrate and the first electrode layer; an organic active layer; a transparent carrier injection layer; a metallic second electrode layer, the metallic layer being at least partially transparent to light produced by the OLED; and a distributed Bragg reflector (DBR), wherein the active layer of the OLED emits light in response to a biasing voltage applied across the first and second electrodes, a first portion of said light passing directly through the transparent carrier injection layer and the second electrode, and a second portion of said light being reflected from the first electrode and subsequently transmitted through the transparent carrier injection layer and the second electrode, and wherein the DBR acts to increase the emission of light in a substantially forward direction.
Claim 18
Dependent Claim
148 words
An organic light emitting diode (OLED), comprising, in sequence: a substrate; a conductive buffer layer; a first electrode layer, the buffer layer enhancing conduction between the substrate and the first electrode layer; an organic active layer; a transparent carrier injection layer; a metallic second electrode layer, the metallic layer being at least partially transparent to light produced by the OLED; and a distributed Bragg reflector (DBR), wherein the active layer of the OLED emits light in response to a biasing voltage applied across the first and second electrodes, a first portion of said light passing directly through the transparent carrier injection layer and the second electrode, and a second portion of said light being reflected from the first electrode and subsequently transmitted through the transparent carrier injection layer and the second electrode, and wherein the DBR acts to increase the emission of light in a substantially forward direction.
Claim 19
Independent Claim
163 words
A method of producing an organic light emitting diode (OLED), comprising: depositing a reflective electrode on a substrate; depositing an organic active layer on the reflective electrode; depositing a transparent injection layer on the organic active layer, the deposition not substantially altering electroluminescent properties of the organic active layer; depositing a transparent organic electrode on the injection layer, the deposition not substantially altering electroluminescent properties of the organic active layer or injection properties of the injection layer; and depositing a distributed Bragg reflector (DBR) on the transparent organic electrode, wherein the active layer emits light in response to a biasing voltage applied across the electrodes, a first portion of said light passing directly through the transparent injection layer and the transparent electrode, and a second portion of said light being reflected from the reflective electrode and subsequently transmitted through the transparent injection layer and the transparent electrode, and wherein the DBR acts to increase the emission of light in a substantially forward direction.
Claim 20
Independent Claim
163 words
A method of producing an organic light emitting diode (OLED), comprising: depositing a reflective electrode on a substrate; depositing an organic active layer on the reflective electrode; depositing a transparent injection layer on the organic active layer, the deposition not substantially altering electroluminescent properties of the organic active layer; depositing a transparent organic electrode on the injection layer, the deposition not substantially altering electroluminescent properties of the organic active layer or injection properties of the injection layer; and depositing a distributed Bragg reflector (DBR) on the transparent organic electrode, wherein the active layer emits light in response to a biasing voltage applied across the electrodes, a first portion of said light passing directly through the transparent injection layer and the transparent electrode, and a second portion of said light being reflected from the reflective electrode and subsequently transmitted through the transparent injection layer and the transparent electrode, and wherein the DBR acts to increase the emission of light in a substantially forward direction.
Claim 21
Dependent Claim
43 words
The method of claim 17 , wherein deposition of the transparent organic electrode is by a method selected from the group consisting of thermal vacuum evaporation coating, spin coating, dip coating, doctor-blading, roll-coating, injection-fill, embossing, stamping, physical vapor deposition and chemical vapor deposition.
Claim 22
Dependent Claim
31 words
The method of claim 17 , wherein the transparent organic electrode comprises a material selected from the group consisting of conductive thiophenes, polyanilines, polyethylenedioxythiophenes, organic/inorganic composites, and combinations and derivatives thereof.
References Cited (Backward Citations)
US5619058A
Cited
US5478658A
Cited
US5703436A
Cited
US5608287A
Cited
US5793062A
Cited
US5736754A
Cited
US5776623A
Cited
US5677572A
Cited
US5714838A
Cited
US5834893A
Cited
US5739545A
Cited
WO1998059528A1
Cited
WO1999003309A1
Cited
WO1999002277A1
Cited
WO1999003087A2
Cited
WO1999020081A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2005-04-01 | 2005-10-01 | 2006-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-04-01 | 2009-10-01 | 2010-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-04-01 | 2013-10-01 | 2014-04-02 | $7700.00 | Window Closed / Lapsed |