WO2001033598A1 - Organic light emitting diode having spherical shaped patterns - Google Patents
Organic light emitting diode having spherical shaped patterns Download PDFInfo
- Publication number
- WO2001033598A1 WO2001033598A1 PCT/US2000/029822 US0029822W WO0133598A1 WO 2001033598 A1 WO2001033598 A1 WO 2001033598A1 US 0029822 W US0029822 W US 0029822W WO 0133598 A1 WO0133598 A1 WO 0133598A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- substrate
- light emitting
- planar form
- planar
- emitting device
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/85—Arrangements for extracting light from the devices
- H10K50/858—Arrangements for extracting light from the devices comprising refractive means, e.g. lenses
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/22—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of auxiliary dielectric or reflective layers
Definitions
- This invention relates to the field of light emitting devices, and more particularly to organic light emitting devices (OLEDs) and the emission efficiency thereof.
- ITO Indium Tin Oxide
- a reflecting cathode e.g. Mg.Ag or Li.Al
- an object of the invention to provide an increase in coupling efficiency for OLEDs.
- an approach is provided for increasing the emission intensity of an organic light emitting diode (OLED) and the total external emission efficiency for an OLED at a normal viewing angle.
- OLED organic light emitting diode
- the inventive approach captures light previously lost to wave-guiding in the substrate and, with proper choice of substrate, light previously lost to wave- guiding in the organic/anode layers.
- a surface texturing approach is provided which, when compared with devices fabricated on typical planar glass substrates, can at least double the emission efficiency for an OLED when glass substrates are used, and at least triple the OLED emission efficiency when high index plastic substrates are used.
- Figure 1 shows ray diagrams for various light paths in a planar OLED.
- Figures 2(a) and 2(b) provide a schematic depiction of the use of spherical surface features to improve light emission efficiency for an OLED according to the invention.
- Figure 3(a) shows measured far field intensity distribution pattern for planar glass substrate and expected profiles of a Lambertian emitter.
- Figure 3(b) shows experimental results for glass substrate devices with and without spherical surface features applied according to the invention.
- Figure 3(c) shows experimental results for PC substrate devices with and without spherical surface features applied according to the invention, along with the planar glass substrate results.
- the coupling efficiency ( ⁇ ext ) of an OLED is a critical factor in the determination of emission efficiency for an OLED display. It is straightforward to analyze ⁇ exl for the type of layered structure used in an OLED by considering the indices of refraction associated with each layer. As a predicate to that analysis, consider the ray diagram for planar OLEDs shown in Figure 1, demonstrating loss by light trapping in the substrate layer (ray II) and in the organic/anode layers (ray III). As shown by ray I of the figure, only light emitted at sufficiently small angles will escape.
- ⁇ org . C2 a critical angle, ⁇ org . C2 , can be obtained, defined by s_n '1 (n subs /n or g). for which light emitted in the organic layer at an angle greater than ⁇ or g. c2 is wave-guided within the ITO and organic layers. This light emission path is illustrated as ray III in Figure 1.
- ⁇ or g, ci defined by for which light emitted in the organic layer at an angle greater than ⁇ org, cl is wave-guided in the substrate — illustrated as ray II in Figure 1. Since only the light emitting at angles less ⁇ org , C2 is emitted from the device — illustrated as ray I in Figure 1. all of the remaining wave-guided light is effectively lost, representing a reduction in ⁇ ext .
- Equation (1) For the expected range of the index of refraction for the organic layer ⁇ between 1.6 and 1.8, it can be seen from Equation (1), that the corresponding range for the coupling efficiency, ⁇ exl , will be between 0.20 and 0.15, demonstrating the significance of the coupling efficiency in degrading system efficiency — i.e. between 80 and 85 percent of the internally generated light is trapped within the device.
- the external coupling efficiency has been improved by a factor of 1.9 ⁇ 0.2 by etching grooves in the glass around the OLED to redirect light trapped in the substrate and organic/ITO layers [See, G. Gu.
- the attachment of a sphere to the backside of the substrate, or shaping the substrate into such a spherical form, shown in Figure 2(a) permits the light rays to escape the substrate at much greater angles.
- n SUb S substrate index
- I subs ( ⁇ subs ) is of interest because Equation (3) only describes the external intensity distribution when the substrate is planar. If the substrate forms a hemisphere with the device at its center, for instance, I e ⁇ t ( ⁇ ff) will be equal to I Subs ( ⁇ SUbs )- In fact, I subs ( ⁇ subs) plays a direct role in determining I ex t( ⁇ ff) in all cases except the special case of a planar substrate. Continuing, the effect of n subs on I subS is to focus the distribution as n SU bs is increased, until at which point I su bs( ⁇ S ubs) reproduces the isotropic intensity distribution initially generated in the organic layer.
- the third and final of the derived parameters is the vertical offset of the device from the center of curvature of the lens (d 0ffset ).
- This parameter is of interest because it strongly affects the far field distribution pattern.
- the analytical expression for I ext when d 0 r se t ⁇ 0 can readily be found in the art. For purposes of this discussion, it is sufficient to point out that when the OLED is positioned too far from the lens (d 0 ff set > 0), I ext will be more focused than I SUbs. and when the OLED is positioned too closely to the lens (d 0ffSet ⁇ 0). I ext will less focused than I subs - However, over a wide range of offset values, there is only a minor degrading effect on ⁇ ex , due to
- the inventors have implemented the approach of the invention for a number of embodiments, which are further described hereafter.
- the OLEDs that constitute these various embodiments were fabricated on glass and polycarbonate (PC) substrates.
- the glass substrate consisted of 0.7 mm and 1.1 mm-thick soda lime glass purchased from Applied Films Co. coated with ITO by the manufacturer.
- the PC substrates consisted of 175 ⁇ m-thick sheets purchased from Goodfellows Co.. with a 100 nm ITO film deposited on it in an Edwards A306 RF magnetron sputter with 2 mTorr pure Ar gas at 150 W RF power at room temperature.
- the sputter target was 90% In 2 ⁇ 3 -10% SnO, 3 in. in diameter.
- the deposition rate was 33 nm/min.
- the OLEDs were made by spinning on a single poly-(N-vinylcarbazole) (PVK)/2-(4-biphenyl)-5-(4-tert-butylphenyl)- l,3,4-oxadiazole(PBD)/Coumarin 6 (C6) layer, and evaporating a 100 to 200 nm Mg:Ag cathode [Wu].
- Typical device size and geometry consisted of a circle 1.75 mm in diameter.
- Trials 1 through 6 were performed with six different substrate structures, which are designated Trials 1 through 6 in Table 1.
- a diagram of the substrate setup (with all relevant parameters identified) is provided in Figure 2(a).
- I n ⁇ _ .a. /Io and F F 0 represent the ratio of normal emission intensity and total emission intensity respectively to the results obtained for identical devices fabricated on planar substrates of the same substrate material.
- the total emission intensity measurement does not include edge emission.
- Equation (1) predicts that the planar cases for the PC and glass substrates should be identical, it can be observed in Figure 3 c that the two cases (Trials 1 and 5) are indeed effectively identical within experimental uncertainties of the trials. This provides experimental justification for comparing the results obtained for PC substrates with those for glass substrates.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU12446/01A AU1244601A (en) | 1999-10-29 | 2000-10-30 | Organic light emitting diode having spherical shaped patterns |
JP2001535202A JP2003513423A (en) | 1999-10-29 | 2000-10-30 | Organic light emitting diode with spherical structure |
KR1020027005440A KR20020065893A (en) | 1999-10-29 | 2000-10-30 | Organic light emitting diode having spherical shaped patterns |
EP00974009A EP1236216A1 (en) | 1999-10-29 | 2000-10-30 | Organic light emitting diode having spherical shaped patterns-- |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US16255299P | 1999-10-29 | 1999-10-29 | |
US60/162,552 | 1999-10-29 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2001033598A1 true WO2001033598A1 (en) | 2001-05-10 |
WO2001033598A8 WO2001033598A8 (en) | 2001-11-01 |
Family
ID=22586119
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2000/029822 WO2001033598A1 (en) | 1999-10-29 | 2000-10-30 | Organic light emitting diode having spherical shaped patterns |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1236216A1 (en) |
JP (1) | JP2003513423A (en) |
KR (1) | KR20020065893A (en) |
CN (1) | CN1384970A (en) |
AU (1) | AU1244601A (en) |
WO (1) | WO2001033598A1 (en) |
Cited By (19)
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FR2836584A1 (en) * | 2002-02-27 | 2003-08-29 | Thomson Licensing Sa | Electro-luminescent panel for colour image display includes optical coupling elements between light cells and output surface |
EP1484946A2 (en) * | 2003-06-06 | 2004-12-08 | Seiko Epson Corporation | Organic electroluminescent display panel, method of manufacturing it and display device equiped with the panel |
WO2005086252A2 (en) * | 2004-03-03 | 2005-09-15 | Cambridge Display Technology Limited | Organic light emitting diode comprising microlens |
WO2005089028A1 (en) | 2004-03-16 | 2005-09-22 | Lg Chem. Ltd. | Highly efficient organic light-emitting device using substrate or electrode having nanosized half-spherical convex and method for preparing |
US7012363B2 (en) | 2002-01-10 | 2006-03-14 | Universal Display Corporation | OLEDs having increased external electroluminescence quantum efficiencies |
JP2006510038A (en) * | 2002-05-15 | 2006-03-23 | リフレキサイト コーポレイション | Optical structure |
US7053547B2 (en) | 2001-11-29 | 2006-05-30 | Universal Display Corporation | Increased emission efficiency in organic light-emitting devices on high-index substrates |
US7153122B2 (en) | 2002-05-28 | 2006-12-26 | 3M Innovative Properties Company | Apparatus for making transversely drawn films with substantially uniaxial character |
US7173276B2 (en) | 2003-09-08 | 2007-02-06 | Lg Chem, Ltd. | Highly efficient organic light emitting device using substrate having nanosized hemispherical recesses and method for preparing the same |
US7229271B2 (en) | 2001-05-31 | 2007-06-12 | 3M Innovative Properties Company | Apparatus for making transversely drawn films with substantially uniaxial character |
WO2008001241A3 (en) * | 2006-06-14 | 2008-09-25 | Philips Intellectual Property | Structured oled with micro optics for generating directed light |
US7798678B2 (en) | 2005-12-30 | 2010-09-21 | 3M Innovative Properties Company | LED with compound encapsulant lens |
WO2012088260A3 (en) * | 2010-12-23 | 2012-11-08 | Universal Display Corporation | Light extraction block with curved surface |
US8373341B2 (en) | 2007-07-10 | 2013-02-12 | University Of Florida Research Foundation, Inc. | Top-emission organic light-emitting devices with microlens arrays |
TWI414725B (en) * | 2009-12-31 | 2013-11-11 | ||
US8885018B2 (en) | 2008-02-21 | 2014-11-11 | Sharp Kabushiki Kaisha | Display device configured to simultaneously exhibit multiple display modes |
US9349991B2 (en) | 2010-10-22 | 2016-05-24 | Semiconductor Energy Laboratory Co., Ltd. | Light-emitting element, light-emitting device, and lighting device |
US10350818B2 (en) | 2005-04-08 | 2019-07-16 | 3M Innovative Properties Company | Heat setting optical films |
US10663745B2 (en) | 2016-06-09 | 2020-05-26 | 3M Innovative Properties Company | Optical system |
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JP2005175417A (en) * | 2003-07-28 | 2005-06-30 | Ricoh Co Ltd | Light emitting element array, light writing unit, and image forming apparatus |
KR100977964B1 (en) | 2004-02-04 | 2010-08-24 | 사천홍시현시기건유한공사 | Organic Electroluminescence device |
JP4839867B2 (en) * | 2006-02-03 | 2011-12-21 | 株式会社日立製作所 | Light emitting element and display device |
US20100327304A1 (en) * | 2009-06-30 | 2010-12-30 | Shinichiro Sonoda | Organic el device and design method thereof |
JP5480567B2 (en) * | 2009-09-01 | 2014-04-23 | パナソニック株式会社 | Organic light emitting device |
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US5371434A (en) * | 1992-04-07 | 1994-12-06 | Smiths Industries Public Limited Company | Radiation-emitting devices having an array of active components in contact with a fluorescent layer |
US5618626A (en) * | 1992-11-09 | 1997-04-08 | Central Glass Company, Limited | Glass plate with ultraviolet absorbing multilayer coating |
US5814416A (en) * | 1996-04-10 | 1998-09-29 | Lucent Technologies, Inc. | Wavelength compensation for resonant cavity electroluminescent devices |
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-
2000
- 2000-10-30 WO PCT/US2000/029822 patent/WO2001033598A1/en not_active Application Discontinuation
- 2000-10-30 KR KR1020027005440A patent/KR20020065893A/en not_active Application Discontinuation
- 2000-10-30 JP JP2001535202A patent/JP2003513423A/en active Pending
- 2000-10-30 EP EP00974009A patent/EP1236216A1/en not_active Withdrawn
- 2000-10-30 AU AU12446/01A patent/AU1244601A/en not_active Abandoned
- 2000-10-30 CN CN00815102A patent/CN1384970A/en active Pending
Patent Citations (4)
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US5371434A (en) * | 1992-04-07 | 1994-12-06 | Smiths Industries Public Limited Company | Radiation-emitting devices having an array of active components in contact with a fluorescent layer |
US5618626A (en) * | 1992-11-09 | 1997-04-08 | Central Glass Company, Limited | Glass plate with ultraviolet absorbing multilayer coating |
US5936347A (en) * | 1995-07-28 | 1999-08-10 | Canon Kabushiki Kaisha | Light emitting device having convex-and-concave structure on substrate |
US5814416A (en) * | 1996-04-10 | 1998-09-29 | Lucent Technologies, Inc. | Wavelength compensation for resonant cavity electroluminescent devices |
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US10913199B2 (en) | 2001-05-31 | 2021-02-09 | 3M Innovative Properties Company | Processes and apparatus for making transversely drawn films with substantially uniaxial character |
US7229271B2 (en) | 2001-05-31 | 2007-06-12 | 3M Innovative Properties Company | Apparatus for making transversely drawn films with substantially uniaxial character |
US7053547B2 (en) | 2001-11-29 | 2006-05-30 | Universal Display Corporation | Increased emission efficiency in organic light-emitting devices on high-index substrates |
US7012363B2 (en) | 2002-01-10 | 2006-03-14 | Universal Display Corporation | OLEDs having increased external electroluminescence quantum efficiencies |
FR2836584A1 (en) * | 2002-02-27 | 2003-08-29 | Thomson Licensing Sa | Electro-luminescent panel for colour image display includes optical coupling elements between light cells and output surface |
JP2006510038A (en) * | 2002-05-15 | 2006-03-23 | リフレキサイト コーポレイション | Optical structure |
US7153122B2 (en) | 2002-05-28 | 2006-12-26 | 3M Innovative Properties Company | Apparatus for making transversely drawn films with substantially uniaxial character |
EP1484946A2 (en) * | 2003-06-06 | 2004-12-08 | Seiko Epson Corporation | Organic electroluminescent display panel, method of manufacturing it and display device equiped with the panel |
EP1484946A3 (en) * | 2003-06-06 | 2007-03-21 | Seiko Epson Corporation | Organic electroluminescent display panel, method of manufacturing it and display device equiped with the panel |
US7173276B2 (en) | 2003-09-08 | 2007-02-06 | Lg Chem, Ltd. | Highly efficient organic light emitting device using substrate having nanosized hemispherical recesses and method for preparing the same |
GB2426622A (en) * | 2004-03-03 | 2006-11-29 | Cambridge Display Tech Ltd | Organic light emitting diode comprising microlens |
WO2005086252A3 (en) * | 2004-03-03 | 2005-10-20 | Cambridge Display Tech Ltd | Organic light emitting diode comprising microlens |
GB2426622B (en) * | 2004-03-03 | 2008-12-31 | Cambridge Display Tech Ltd | Organic light emitting diode comprising microlens |
WO2005086252A2 (en) * | 2004-03-03 | 2005-09-15 | Cambridge Display Technology Limited | Organic light emitting diode comprising microlens |
US7414263B2 (en) | 2004-03-16 | 2008-08-19 | Lg Chem, Ltd. | Highly efficient organic light-emitting device using substrate or electrode having nanosized half-spherical convex and method for preparing the same |
WO2005089028A1 (en) | 2004-03-16 | 2005-09-22 | Lg Chem. Ltd. | Highly efficient organic light-emitting device using substrate or electrode having nanosized half-spherical convex and method for preparing |
US7741145B2 (en) | 2004-03-16 | 2010-06-22 | Lg Chem. Ltd. | Highly efficient organic light-emitting device using substrate or electrode having nanosized half-spherical convex and method for preparing the same |
US8158971B2 (en) | 2004-03-16 | 2012-04-17 | Lg Chem. Ltd. | Highly efficient organic light-emitting device using substrate or electrode having nanosized half-spherical convex and method for preparing the same |
US10350818B2 (en) | 2005-04-08 | 2019-07-16 | 3M Innovative Properties Company | Heat setting optical films |
US7798678B2 (en) | 2005-12-30 | 2010-09-21 | 3M Innovative Properties Company | LED with compound encapsulant lens |
WO2008001241A3 (en) * | 2006-06-14 | 2008-09-25 | Philips Intellectual Property | Structured oled with micro optics for generating directed light |
US8125138B2 (en) | 2006-06-14 | 2012-02-28 | Koninklijke Philips Electronics N.V. | Structured OLED with micro optics for generating directed light |
US8373341B2 (en) | 2007-07-10 | 2013-02-12 | University Of Florida Research Foundation, Inc. | Top-emission organic light-emitting devices with microlens arrays |
US8885018B2 (en) | 2008-02-21 | 2014-11-11 | Sharp Kabushiki Kaisha | Display device configured to simultaneously exhibit multiple display modes |
TWI414725B (en) * | 2009-12-31 | 2013-11-11 | ||
US9349991B2 (en) | 2010-10-22 | 2016-05-24 | Semiconductor Energy Laboratory Co., Ltd. | Light-emitting element, light-emitting device, and lighting device |
US9293734B2 (en) | 2010-12-23 | 2016-03-22 | Universal Display Corporation | Light extraction block with curved surface |
WO2012088260A3 (en) * | 2010-12-23 | 2012-11-08 | Universal Display Corporation | Light extraction block with curved surface |
US10663745B2 (en) | 2016-06-09 | 2020-05-26 | 3M Innovative Properties Company | Optical system |
Also Published As
Publication number | Publication date |
---|---|
AU1244601A (en) | 2001-05-14 |
KR20020065893A (en) | 2002-08-14 |
CN1384970A (en) | 2002-12-11 |
JP2003513423A (en) | 2003-04-08 |
WO2001033598A8 (en) | 2001-11-01 |
EP1236216A1 (en) | 2002-09-04 |
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