WO2007132965A1 - Dispositif électroluminescent à haute intensité et son mode de production - Google Patents

Dispositif électroluminescent à haute intensité et son mode de production Download PDF

Info

Publication number
WO2007132965A1
WO2007132965A1 PCT/KR2006/003914 KR2006003914W WO2007132965A1 WO 2007132965 A1 WO2007132965 A1 WO 2007132965A1 KR 2006003914 W KR2006003914 W KR 2006003914W WO 2007132965 A1 WO2007132965 A1 WO 2007132965A1
Authority
WO
WIPO (PCT)
Prior art keywords
layer
light
emitting
electrode
electrode layer
Prior art date
Application number
PCT/KR2006/003914
Other languages
English (en)
Inventor
Cheong-A Baek
Young-Jun Seo
Original Assignee
Cheong-A Baek
Young-Jun Seo
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Cheong-A Baek, Young-Jun Seo filed Critical Cheong-A Baek
Publication of WO2007132965A1 publication Critical patent/WO2007132965A1/fr

Links

Classifications

    • 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

  • the present invention relates to an electroluminescence device and a method for manufacturing the electroluminescence device, and more particularly, to a high-luminance electroluminescence device capable of achieving high brightness and a method for manufacturing the electroluminescence device.
  • LCD liquid crystal display
  • EL electroluminescence
  • the EL device has thin, lightweight, and uniform surface light-emitting characteristics and a simpler manufacturing process than other types of lighting devices. Therefore, the EL device is used as backlighting for LCD apparatuses, keypads, etc., and is emerging quickly as a foundation technology of next-generation display apparatuses.
  • a conventional EL device has lower luminance than that of a light-emitting diode (LED), which is also used as backlighting for LCD apparatuses, keypads, etc.
  • LED light-emitting diode
  • the present invention provides an electroluminescence (EL) device capable of achieving high luminance.
  • EL electroluminescence
  • the present invention also provides a method for manufacturing an EL device capable of achieving high luminance.
  • an EL device in one aspect of the present invention, includes a first electrode layer, a first light-emitting layer, an electric charge-recharging layer, a second light-emitting layer, a dielectric layer and a second electrode layer.
  • the first light-emitting layer is disposed on the first electrode layer.
  • the electric charge-recharging layer is disposed on the first light-emitting layer.
  • the second light-emitting layer is disposed on the electric charge-recharging layer.
  • the dielectric layer is disposed on the second light-emitting layer.
  • the second electrode layer is disposed on the dielectric layer.
  • an insulation substrate is further disposed below the first electrode layer.
  • a protection layer is further disposed on the second electrode layer.
  • the EL device further includes a first insulation layer formed between the first electrode layer and the first light-emitting layer.
  • the first insulation layer suppresses generation of fine pinholes in a boundary area between the first electrode layer and the first light-emitting layer to decrease a leakage current.
  • the EL device further includes a second insulation layer formed between the first light-emitting layer and the electric charge-recharging layer.
  • the second insulation layer suppresses generation of fine pinholes in a boundary area of an upper portion of the light-emitting layer to decrease a leakage current.
  • the EL device further includes a third insulation layer formed between the dielectric layer and the second electrode layer.
  • the third insulation layer may suppress generation of fine pinholes in a boundary area of an upper portion of the dielectric layer to decrease a leakage current and suppress infiltration of the second electrode layer.
  • the electric charge-recharging layer includes a conductive organic polymer having high light transmittance.
  • the electric charge-recharging layer includes poly(3,4-ethylenedioxythiophene) (PEDOT).
  • a first electrode layer is formed. Then, a first light-emitting layer is formed on the first electrode layer. Then, an electric charge-recharging layer is formed on the first light-emitting layer. Then, a dielectric layer is formed on the second light-emitting layer. Then, a second electrode layer is formed on the dielectric layer. For example, a protection layer is further formed on the second electrode layer.
  • the first electrode layer includes an optically transparent and electrically conductive material.
  • the first electrode is formed by one of a sputtering method, a deposition method, a spin-coating method and a screen printing method.
  • the EL device and the method for manufacturing the EL device two light-emitting layers are formed, and an electric charge-recharging layer that rapidly provides electric charges between the two light-emitting layers is formed, so that an electric charge quantity and an instantaneous electric field are increased when the EL device is driven so that a high luminance light is emitted.
  • FIG. 1 is a cross-sectional view illustrating an electroluminescence (EL) device according to an example embodiment of the present invention
  • FIGS. 2 to 9 are cross-sectional views illustrating a method for manufacturing an EL device according to one example embodiment of the present invention.
  • FIG. 10 is a cross-sectional view illustrating an EL device according to another example embodiment of the present invention
  • FIGS. 11 to 21 are cross-sectional views illustrating a method for manufacturing an EL device according to another example embodiment of the present invention.
  • FIG. 22 is a cross-sectional view illustrating an EL device according to a comparative example embodiment of the present invention.
  • FIG. 1 is a cross-sectional view illustrating an electroluminescence (EL) device according to an example embodiment of the present invention.
  • an EL device includes an insulation substrate 20, a first electrode layer
  • a first light-emitting layer 23 an electric charge-recharging layer 25
  • a second light-emitting layer 26 a dielectric layer 27, a second electrode layer 29 and a polymer protection layer 30.
  • the insulation substrate 20 includes an optically transparent material.
  • the insulation substrate 20 may include a transparent plastic substrate.
  • the insulation substrate 20 defines a shape of the EL device, and supports the EL device.
  • the insulation substrate 20 isolates and protects the first electrode layer 21 from the exterior, and transmits light generated from the first light-emitting layer 23 to emit the light toward the exterior.
  • the first electrode layer 21 includes a conductive material having a metal oxide compound or a conductive material having high light transmittance.
  • the first electrode layer 21 is formed on the insulation substrate 20 through a sputtering method, a deposition method, a spin-coating method, a screen printing method, etc.
  • the first light-emitting layer 23 is formed on the first electrode layer 21.
  • the first light-emitting layer 23 emits light by emitting light energy due to impact excitation with outer electrons of an internal light-emitting area in response to a potential difference that is applied through the first electrode layer 21 and the second electrode layer 29.
  • the electric charge-recharging layer 25 is formed on the first light-emitting layer 23.
  • the electric charge-recharging layer 25 recharges electric charges in an interface portion of the first light-emitting layer 23.
  • the electric charge-recharging layer 25 performs as an electric charge transport layer that induces electric charges in the boundary area of the first and second light-emitting layers 23 and 26, when minute electric charges are transferred in the electric charge-recharging layer 25.
  • the electric charge-recharging layer 25 includes a transparent conductive material to enhance light transmittance.
  • the second light-emitting layer 26 is formed on the electric charge-recharging layer 25.
  • the second light-emitting layer 26 emits light by emitting light energy due to impact excitation with outer electrons of an internal light-emitting area in response to a potential difference that is applied through the first and second electrode layers 21 and 29.
  • the dielectric layer 27 is formed on the second light-emitting layer 26.
  • the dielectric layer 27 forms an electric field in the second light-emitting layer
  • the dielectric layer 26 by generating a positive and negative polarization phenomenon of charges in an interface portion of the second light-emitting layer 26.
  • 27 includes a dielectric powder such as SrTiO, BaTiO and TiO 2 and an organic polymer binder to ensure a high dielectric constant.
  • the second electrode layer 29 is formed on the dielectric layer 27.
  • the polymer protection layer 30 covers a portion of an upper surface of the second electrode layer 29, and side surfaces of the first light-emitting layer 23, the electric charge-recharging layer 25, the second light-emitting layer 26, the dielectric layer 27 and the second electrode layer 29, to protect the EL device from external humidity, pollution and impacts.
  • a relatively high electric field is formed in each of the interiors of the first light-emitting layer 23 and the second light-emitting layer 26.
  • Electrons that are accelerated by the high electric field collide with and excite electrons in each of the interiors of the first and second light-emitting layers 23 and 26.
  • the excited electrons return to the ground state, light is emitted.
  • the light, which is generated in the first light-emitting layer 23, transmits through the first electrode layer 21 and the insulation substrate 20 to exit toward the exterior.
  • the light which is generated in the interior of the second light-emitting layer 23, transmits through the electric charge-recharging layer 25, the first light-emitting layer 23, the first electrode layer 21 and the insulation substrate 20 to exit toward the exterior.
  • a charging quantity of each of the first and second light-emitting layers 23 and 26 may be further increased. As the charging quantity is increased, electric charges are rapidly provided to the interior of the first and second light-emitting layers 23 and 26 and an instantaneous electric field is increased, so that high luminance of the EL device is accomplished.
  • Example Embodiment 2 (Method for manufacturing an EL device)
  • FIGS. 2 to 9 are cross-sectional views illustrating a method for manufacturing an EL device according to one Example embodiment of the present invention.
  • an insulation substrate 20 is prepared.
  • the insulation substrate 20 includes an optically transparent material.
  • the insulation substrate 20 may include a transparent plastic substrate.
  • the insulation substrate 20 defines a shape of an organic light-emitting device and supports the organic light-emitting device.
  • the insulation substrate 20 insulates and protects the first electrode layer 21 from the exterior, and transmits the light generated in the first light-emitting layer 23 to the exterior.
  • a first electrode layer 21 is formed on the first insulation substrate 20 through a sputtering method, a deposition method, a spin-coating method, a screen printing method, etc.
  • the first electrode layer 21 includes a conductive material having a metal oxide compound or a conductive material having high light transmittance.
  • the first electrode layer 21 may include an indium tin oxide (ITO) paste having an ITO powder and a binder, antimony tin oxide (ATO), or a conductive polymer.
  • ITO indium tin oxide
  • ATO antimony tin oxide
  • the first electrode layer 21 may include a mixture material of a conductive polymer and an ITO powder.
  • the first light-emitting layer 23 is formed on the first electrode layer 21.
  • the first light-emitting layer 23 includes a light-emitting substance powder and a binder.
  • the light-emitting substance powder may include a group II- VI compound consisting of an element from group II and an element from group VI, such as ZnS.
  • the binder used in the first light-emitting substance layer 23 has a dielectric constant that is greater than that of the light-emitting substance powder.
  • the binder may include cyanoethyl pullulan, fluororesin, and the like.
  • an electric charge-recharging layer 25 is formed on the first light-emitting layer 23.
  • the electric charge-recharging layer 25 includes a transparent conductive material to enhance light transmittance.
  • the electric charge-recharging layer 25 may include poly(3 ,4-ethylenedioxythiophene) (PEDOT).
  • a second light-emitting layer 26 is formed on the electric charge-recharging layer 25.
  • the second light-emitting layer 26 includes a light-emitting substance powder and a binder.
  • the light-emitting substance powder may include a group II- VI compound consisting of a group II element and a group VI element, such as ZnS.
  • the binder used in the second light-emitting substance layer 26 has a dielectric constant that is greater than that of the light-emitting substance powder.
  • the binder may include cyanoethyl pullulan, fluororesin, and the like.
  • the first and second light-emitting layers 23 and 26 may be composed of the same material. Alternatively, the first and second light-emitting layers 23 and 26 may be composed of different materials.
  • a dielectric layer 27 is formed on the second light-emitting layer 26.
  • the dielectric layer 27 includes a mixture of a dielectric substance powder and a binder.
  • the dielectric substance powder includes a material having high dielectric constant such as SrTiO, BaTiO, TiO 2 , and the like, and particle sizes of about 0.1 ⁇ m to about 10 ⁇ m.
  • the binder that is used in the dielectric layer 27 may include cyanoethyl pullulan, fluororesin, and the like.
  • a light-emitting dye such as rhodamine or a light-emitting pigment, may be mixed into the binder of the light-emitting layer 26 or the binder of the dielectric layer 27.
  • a second electrode layer 29 is formed on the dielectric layer 27.
  • the second electrode layer 29 includes a mixture of a conductive powder and a binder, a conductive organic polymer, or a mixture of the conductive powder and the conductive organic polymer.
  • the conductive powder includes, for example, a carbon powder, a silver powder, a copper powder, a copper powder having silver coated thereon, etc.
  • the conductive polymer includes, for example, PEDOT, poly(3,4-ethylenedioxythiophene) ⁇ oly(styrenesulfonate) (PEDOTiPSS), etc.
  • a polymer protection layer 30 is formed to cover a portion of an upper surface of the second electrode layer 29, and side surfaces of the first light-emitting layer 23, the electric charge-recharging layer 25, the second light-emitting layer 26, the dielectric layer 27 and the second electrode layer 29.
  • the polymer protection layer 30 protects the EL device from external humidity, pollution and impacts.
  • the polymer protection layer 30 should have superior moisture-proof properties after drying of the polymer protection layer 30 and superior adhesive properties for adhesion to the insulation substrate 20, so that the polymer protection layer 30 may include a polymer of a fluorine compound, a binder including polyurethane, or a polymer that hardens when infrared (IR) light or ultraviolet (UV) light is irradiated to the polymer protection layer 30.
  • the polymer protection layer 30 may include a polymer of a fluorine compound, a binder including polyurethane, or a polymer that hardens when infrared (IR) light or ultraviolet (UV) light is irradiated to the polymer protection layer 30.
  • the EL device is manufactured as a paste formed with a powder and a polymer through a screen printing method.
  • an air bubble is formed in the target printed substance.
  • fine pinholes are generated in a portion of the air bubble.
  • the fine pinholes generated in the interior of the light-emitting layer or the insulation layer may induce a leakage current in the interior of the EL device.
  • the leakage current decreases the lifetime of the light-emitting power, so that the lifetime of the EL device may be decreased.
  • FIG. 10 is a cross-sectional view illustrating an EL device according to another example embodiment of the present invention.
  • an EL device includes an insulation substrate 20, a first electrode layer 21, a first insulation polymer layer 22, a first light-emitting layer 23, a second insulation polymer layer 24, an electric charge-recharging layer 25, a second light-emitting layer 26, a dielectric layer 27, a third insulation polymer layer 28, a second electrode layer 29 and a polymer protection layer 30.
  • the first insulation polymer layer 22 is formed on the first electrode layer 21.
  • the first insulation polymer layer 22 may prevent fine pinholes from being generated in an interface portion between the first electrode layer 21 and the light-emitting layer 23 to perform a function of decreasing the leakage current.
  • the second insulation polymer layer 24 is formed on the first light-emitting layer 23. The second insulation polymer layer 24 may prevent fine pinholes from being generated in an interface surface of an upper portion of the first light-emitting layer 23 to decrease a leakage current.
  • the third insulation polymer layer 28 is formed on the dielectric layer 27.
  • the third insulation polymer layer 28 may prevent fine pinholes from being generated in an interface surface of an upper portion of the dielectric layer 27 to decrease a leakage current, and may perform a function of preventing infiltration of the second electrode 29.
  • a first terminal electrode is formed at a first end portion of the first electrode layer 21, and a second terminal electrode is formed at a first end portion of the second electrode layer 29.
  • An AC driving power source that is applied to the first and second electrode layers 21 and 29 is substantially the same as that in FIG. 1.
  • the first to third insulation polymer layers 22, 24 and 28 are added to the structure of FIG. 1, so that pinholes that may be generated during a screen printing process may be removed.
  • the first insulation polymer layer 22 is formed between the first electrode layer 21 and the first light-emitting layer 23, thereby preventing direct contact between the first electrode layer 21 and the first light-emitting layer 23. Furthermore, the first insulation polymer layer 22 may prevent the fine pinholes from being generated in an interface portion between the first electrode layer 21 and the light-emitting layer 23 to perform a function of decreasing the leakage current. Furthermore, the first insulation polymer layer 22 prevents rapid loss and movement of electric charges that are generated in the interior of the first light-emitting layer 23.
  • the second insulation polymer layer 24 is formed between the first light-emitting layer 23 and the electric charge-recharging layer 25, thereby preventing contact between the first light-emitting layer 23 and the electric charge-recharging layer 25. Furthermore, the second insulation polymer layer 24 may suppress generation of the fine pinholes at a boundary surface of an upper portion of the light-emitting layer 23 to decrease the leakage current, and prevents rapid loss and movement of electric charges that are generated in the interior of the first light-emitting layer 23.
  • the third insulation polymer layer 28 is formed between the dielectric layer 27 and the second electrode layer 29, thereby preventing the fine pinholes from being generated in an interface surface of an upper portion of the dielectric layer 27 to decrease a leakage current, and may perform a function of preventing infiltration of the conductive powder of the second electrode 29 from the dielectric layer 27.
  • the first to third insulation polymer layers 22, 24 and 28 may remove fine pinholes that may be generated during a screen printing process, so that a leakage current that internally damages the first to third insulation polymer layers 22, 24 and 28 may be prevented and insulating characteristics may be enhanced.
  • first to third insulation polymer layers 22, 24 and 28 may also have characteristics of a polar polymer, so that electric charges, which are generated as dielectric polarization in the light-emitting layers that are adjacent to each other, may be induced due to a dielectric constant of an organic polymer to achieve high luminance.
  • a flow of a leakage current that is generated by the pinholes in the conventional EL device may be minimized.
  • insulation characteristics may be enhanced, so that internal damage (i.e., an insulation breakdown) of an EL device may be prevented.
  • a dielectric constant of the organic polymer is increased due to dielectric polarization characteristics of the insulation organic polymer, so that electric charges may be induced, which are generated as dielectric polarization in the light-emitting layers that are adjacent to each other. Therefore, a voltage is increased to achieve a relatively high luminance.
  • each of the first to third insulation polymer layers is formed between the first electrode layer and first light-emitting layer, the first light-emitting layer and electric charge-recharging layer, and the dielectric layer and second electrode layer, respectively, so that each of the insulation polymer layers may prevent the leakage current. Therefore, the EL device may be stably driven.
  • the lifetime of the EL device may be extended.
  • Example Embodiment 4 (Method for manufacturing an EL device)
  • FIGS. 11 to 21 are cross-sectional views illustrating a method for manufacturing an EL device according to another example embodiment of the present invention.
  • an insulation substrate 20 is prepared.
  • the insulation substrate 20 includes, for example, a transparent material.
  • the insulation substrate 20 defines a shape of an EL device, and supports the EL device.
  • the insulation substrate 20 isolates and protects the first electrode layer 21 from the exterior, and transmits light generated from the first light-emitting layer 23 to emit the light toward the exterior.
  • a first electrode layer 21 is formed on the insulation substrate 20 through a sputtering method, a deposition method, a spin-coating method, a screen printing method, etc.
  • the first electrode layer 21 may include a conductive material having a metal oxide compound and a conductive material having high light transmittance.
  • the first electrode layer 21 may include an ITO paste having an ITO powder and a binder,
  • the first electrode layer 21 may include a mixture material of a conductive polymer and an ITO powder.
  • a first insulation polymer layer 22 is formed on the transparent electrode layer 21.
  • the first light-emitting layer 23 is formed on the first insulation polymer layer 22.
  • the first light-emitting layer 23 includes a light-emitting substance powder and a binder.
  • the light-emitting substance powder may include a group II-VI compound consisting of a group II element and a group VI element, such as ZnS.
  • the binder used in the first light-emitting substance layer 23 has a dielectric constant that is greater than that of the light-emitting substance powder.
  • the binder may include cyanoethyl pullulan, fluororesin, and the like.
  • a second insulation polymer layer 24 is formed on the first light-emitting layer 23.
  • an electric charge-recharging layer 25 is formed on the second insulation polymer layer 24.
  • the electric charge-recharging layer 25 includes a transparent conductive material to enhance light transmittance.
  • the electric charge-recharging layer 25 may include PEDOT.
  • a second light-emitting layer 26 is formed on the electric charge-recharging layer 25.
  • the second light-emitting layer 26 includes a light-emitting substance powder and a binder.
  • the light-emitting substance powder may include a group II-VI compound consisting of a group II element and a group VI element, such as ZnS.
  • the binder used in the second light-emitting substance layer 26 has a dielectric constant that is greater than that of the light-emitting substance powder.
  • the binder may include cyanoethyl pullulan, fluororesin, and the like.
  • the first and second light-emitting layers 23 and 26 may be composed of the same material. Alternatively, the first and second light-emitting layers 23 and 26 may be composed of different materials.
  • a dielectric layer 27 is formed on the second light-emitting layer 26.
  • the dielectric layer 27 includes a mixture of a dielectric substance powder and a binder.
  • the dielectric substance powder includes a material having high dielectric constant such as SrTiO, BaTiO, TiO 2 , and the like, and particle sizes of about 0.1 ⁇ m to about 10 ⁇ m.
  • the binder that is used in the dielectric layer 27 may include cyanoethyl pullulan, fluororesin, and the like.
  • a light-emitting dye such as rhodamine or a light-emitting pigment, may be mixed into the binder of the light-emitting layer 26 or the binder of the dielectric layer 27.
  • a third insulation polymer layer 28 is formed on the dielectric layer 27.
  • a second electrode layer 29 is formed on the third insulation polymer layer 28.
  • the second electrode layer 29 includes a mixture of a conductive powder and a binder, a conductive organic polymer, or a mixture of the conductive powder and the conductive organic polymer.
  • the conductive powder includes, for example, a carbon powder, a silver powder, a copper powder, a copper powder having silver coated thereon, etc.
  • the conductive polymer includes, for example, PEDOT, PEDOT:PSS, etc.
  • a polymer protection layer 30 is formed to cover a portion of an upper surface of the first electrode layer 21, and side surfaces of the first insulation polymer layer 22, the first light-emitting layer 23, the second insulation polymer layer 24, the electric charge-recharging layer 25, the second light-emitting layer 26, the dielectric layer 27, the third insulation polymer layer 28 and the second electrode layer 29.
  • the polymer protection layer 30 protects the EL device from external humidity, pollution and impacts.
  • the polymer protection layer 30 should have superior moisture-proof properties after drying of the polymer protection layer 30 and superior adhesive properties for adhesion to the insulation substrate 20, so that the polymer protection layer 30 may include a polymer of a fluorine compound, a binder including polyurethane, and a polymer that hardens when IR light or UV light is irradiated to the polymer protection layer 30.
  • FIG. 22 is a cross-sectional view illustrating an EL device according to a comparative example embodiment of the present invention. Particularly, FIG. 22 illustrates a cross-sectional view of a conventional EL device. Referring to FIG. 22, an EL device according to the Comparative
  • Example of the present invention includes an insulation substrate 10, a first electrode layer 11, a light-emitting layer 12, a dielectric layer 13, a second electrode layer 14 and a protection layer 15.
  • Each of the insulation substrate 10, the first electrode layer 11, the light-emitting layer 12, the dielectric layer 13, the second electrode layer 14 and the protection layer 15 is substantially the same as the insulation substrate 20, the first electrode layer 21, the first light-emitting layer 23, the dielectric layer 27, the second electrode layer 29 and the protection layer 30 as described in FIG. 1, respectively, so that any further explanation concerning the above elements will be omitted.
  • a data checklist that is set to check electrical characteristics and optical characteristics of each of the EL device according to the present invention and the EL device according to the Comparative Example, is illustrated in the following Table 1.
  • Table 2 illustrates moisture test results of the EL device according to the present invention and the EL device according to the Comparative Example. Particularly, driving conditions of the EL device were under test conditions, in which a voltage and a frequency were about 100 V and about 400 Hz, respectively, and a relatively humidity (RH) was about 60% to about 90%.
  • RH relatively humidity
  • the EL device according to the present invention had a luminance characteristic of about 55.9 cd/m 2
  • the EL device according to the Comparative Example had a luminance characteristic of about 77.4 cd/m 2 . Therefore, the EL device of the present invention had a luminance enhanced by about 21.5 cd/m 2 in comparison with the EL device of the Comparative Example.
  • a luminance with respect to the initial luminance of the EL device of the Comparative Example decreased by about 45%, and that of the EL device of the present invention decreased by about 31%. That is, according to the results of the reliability characteristics, after about 120 hours, the EL device of the present invention had reliability characteristics enhanced by about 14% in comparison with the EL device of the Comparative Example.
  • a luminance with respect to the initial luminance of the EL device according to the Comparative Example decreased by about 71%, and that of the EL device according to the present invention decreased by about 54%. That is, according to the results of the reliability characteristics after about 240 hours, the EL device according to the present invention had reliability characteristics enhanced by about 17% in comparison with the EL device according to the Comparative Example. Therefore, under high temperature and moisture, the EL device according to the present invention may have relatively stable reliability.
  • an initial luminance of the EL device of the present invention may be relatively higher than that of the EL device of the Comparative Example, and reliability of the EL device of the present invention may be enhanced in comparison with the EL device of the Comparative Example.
  • Table 3 illustrates electric data of the EL device according to the example embodiment of the present invention and the EL device according to the Comparative Example. Particularly, driving conditions of the EL device were under test conditions, in which a voltage and a frequency were about 100 V and about 400 Hz, respectively.
  • the following Table 3 illustrates a comparison of capacitance values of the Comparative Example and the example embodiment of the present invention.
  • Relation Equation 1 a relationship between a luminance and a capacitance is defined by the following Relation Equation 1.
  • 'B' denotes a luminance
  • 'C d ' denotes a capacitance of an insulation layer
  • 'V 8 ' denotes an external applying voltage
  • 'V at ' denotes an external threshold voltage between the insulation layer and a light-emitting layer
  • 'E pth ' denotes a threshold voltage of the light-emitting layer.
  • a charging quantity Q is defined by a multiplying a voltage V a -V at that is applied from the exterior and a capacitance Ca of the insulation layer.
  • a luminance B may be increased.
  • the EL device of the present invention may have a relatively higher capacitance than the EL device of the Comparative Example.
  • a dielectric constant of a polymer that is used in the EL device according to the present invention is relatively higher, a charging quantity that is generated as dielectric polarization in an interface portion between the third insulation polymer layer and the insulation layer may be increased. Therefore, a dielectric constant of the dielectric layer is increased, so that luminance of the EL device according to the present invention may be enhanced with respect to that of the EL device according to the Comparative Example.
  • a charging quantity, which is induced by the third insulation polymer layer, is increased in addition to a dielectric constant of the dielectric layer.
  • Table 4 illustrates current data of the EL device according to the example embodiment of the present invention and the EL device according to the Comparative Example. Particularly, comparative data corresponding to a minute current, which is generated from the EL device according to the present invention, is illustrated in the following Table 4.
  • the first to third insulation polymer layers cover the fine pinholes that may be generated on each of the layers, so that a minute leakage current, which may be generated by the fine pinholes when a voltage is applied thereto, may be prevented.
  • Tables 5 and 6 illustrate optical data of the EL device according to the example embodiment of the present invention and the EL device according to the Comparative Example. Particularly, Table 5 illustrates luminance values and color coordinates under conditions of about 100 V/400 Hz, and Table 6 illustrates luminance values and color coordinates under conditions of about l20 V/60 Hz. Table 5
  • each of the first to third samples corresponding to the EL device according to the Comparative Example had a luminance characteristic of about 55.9 cd/m 2 , about 54.7 cd/m 2 and about
  • each of the fourth to sixth samples corresponding to the EL device according to the present invention had a luminance characteristic of about 77.4 cd/m 2 , about 73.4 cd/m 2 and about 76.7 cd/m 2 , respectively.
  • the EL device according to the present invention had an enhanced luminance of about 20 cd/m 2 in comparison with the EL device according to the Comparative Example.
  • CIE Commission Internationale de l'Eclairege
  • each of the first to third samples corresponding to the EL device according to the Comparative Example had a luminance characteristic of about 20.5 cd/m 2 , about 20.9 cd/m 2 and about
  • each of the fourth to sixth samples corresponding to the EL device according to the present invention had a luminance characteristic of about 29.1 cd/m 2 , about 28.6 cd/m 2 and about 28.4 cd/m 2 , respectively.
  • the EL device according to the present invention had an enhanced luminance of about 8 cd/m 2 in comparison with the EL device according to the Comparative Example.
  • CIE color coordinates of the EL device according to the Comparative Example and those of the EL device according to the present invention were substantially equal to each other.
  • the structure of the EL device according to the present invention includes the first and second light-emitting layers 23 and 26 that are formed between the first electrode layer 21 and the second electrode layer 29, and the electric charge-recharging layer 25 is formed between the first and second light-emitting layers 23 and 26.
  • the electric charge-recharging layer 25 rapidly provides electric charges to each of the interiors of the first and second light-emitting layers 23 and 26, so that an electric charge quantity and an instantaneous electric field are further increased, and thus luminance of the EL device may be increased.
  • the electric charge-recharging layer 25 is formed between the first light-emitting layer 23 and the second light-emitting layer 26, so that electric charges are recharged in the first to second light-emitting layers 25 and 26 when the EL device is driven, and thus an electric charge quantity that is provided to each of the first and second light-emitting layers 25 and 26 may be further increased.
  • a voltage that is applied to the first and second light-emitting layers 25 and 26 is increased, so that luminance of the EL device according to the present invention may be enhanced about 30% to about 40% with respect to that of the EL device having a single light-emitting layer according to the Comparative Example.
  • the electroluminescence (EL) device in the electroluminescence (EL) device, two light-emitting layers are formed between the first electrode layer and the second electrode layer, and the electric charge-recharging layer is formed between the two light-emitting layers, so that consumption power of the EL device may be reduced and luminance of the EL device may be increased.
  • the first insulation polymer layer is formed between the first electrode layer and the first light-emitting layer
  • the second insulation polymer layer is formed between the first light-emitting layer and the electric charge-recharging layer
  • the third insulation polymer layer is formed between the organic layer and the second electrode layer, so that driving stability of the EL device may be achieved. Furthermore, reliability of the EL device may be increased, and the lifetime of the EL device may be extended.

Landscapes

  • Electroluminescent Light Sources (AREA)

Abstract

Un dispositif électroluminescent (EL) inclut une première couche d'électrode, une première couche émettrice de lumière, une couche rechargeant une charge électrique, une deuxième couche émettrice de lumière, une couche diélectrique et une deuxième couche d'électrode. La première couche émettrice de lumière est placée sur la première couche d'électrode. La couche rechargeant une charge électrique est placée sur la première couche émettrice de lumière. La deuxième couche émettrice de lumière est placée sur la couche rechargeant une charge électrique. La couche diélectrique est placée sur la couche émettrice de lumière. La deuxième couche d'électrode est placée sur la couche diélectrique. Par conséquent, deux couches émettrices de lumière sont formées et une couche rechargeant une charge électrique qui fournit rapidement des charges électriques entre les deux couches émettrices de lumière est formée, de sorte qu'une quantité de charge électrique et un champ électrique instantané peuvent être augmentés quand le dispositif électroluminescent EL est actionné et ainsi, une lumière à forte luminance peut être émise.
PCT/KR2006/003914 2006-05-12 2006-09-29 Dispositif électroluminescent à haute intensité et son mode de production WO2007132965A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR20060043064 2006-05-12
KR10-2006-0043064 2006-05-12

Publications (1)

Publication Number Publication Date
WO2007132965A1 true WO2007132965A1 (fr) 2007-11-22

Family

ID=38694044

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2006/003914 WO2007132965A1 (fr) 2006-05-12 2006-09-29 Dispositif électroluminescent à haute intensité et son mode de production

Country Status (1)

Country Link
WO (1) WO2007132965A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020106530A1 (en) * 2000-04-07 2002-08-08 Tadashi Ishibashi Organic electroluminescent element and luminescent apparatus employing the same
JP2003045676A (ja) * 2001-07-26 2003-02-14 Junji Kido 有機エレクトロルミネッセント素子
US20030170491A1 (en) * 2002-02-15 2003-09-11 Eastman Kodak Company Providing an organic electroluminescent device having stacked electroluminescent units
US20030189401A1 (en) * 2002-03-26 2003-10-09 International Manufacturing And Engineering Services Co., Ltd. Organic electroluminescent device
US20040027059A1 (en) * 2002-08-09 2004-02-12 Semiconductor Energy Laboratory Co., Ltd. Organic electroluminescent device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020106530A1 (en) * 2000-04-07 2002-08-08 Tadashi Ishibashi Organic electroluminescent element and luminescent apparatus employing the same
JP2003045676A (ja) * 2001-07-26 2003-02-14 Junji Kido 有機エレクトロルミネッセント素子
US20030170491A1 (en) * 2002-02-15 2003-09-11 Eastman Kodak Company Providing an organic electroluminescent device having stacked electroluminescent units
US20030189401A1 (en) * 2002-03-26 2003-10-09 International Manufacturing And Engineering Services Co., Ltd. Organic electroluminescent device
US20040027059A1 (en) * 2002-08-09 2004-02-12 Semiconductor Energy Laboratory Co., Ltd. Organic electroluminescent device

Similar Documents

Publication Publication Date Title
EP2461649B1 (fr) Élément électroluminescent organique
JP6751459B2 (ja) 有機エレクトロルミネッセンス照明パネル、その製造方法及び有機エレクトロルミネッセンス照明装置
KR100658237B1 (ko) 광도가 증가된 ｅｌ 램프
TWI386106B (zh) 電激發光元件
KR20090128487A (ko) 면발광체
JP2010045011A (ja) 発光装置及びその製造方法
CN105163412B (zh) 一种平面电致发光器件及其应用
JP2009181856A (ja) 透明導電膜付き透明板および有機エレクトロルミネッセンス素子
EP2501207A1 (fr) Procédé de fabrication d'un élément électroluminescent organique
KR20090047977A (ko) 무기 발광 소자
JP2005317251A (ja) 発光素子及び表示装置
CN105917736B (zh) 发光装置及发光装置的制造方法
CN105228283B (zh) 一种可重复利用柔性无机电致发光器件
JP2007095627A (ja) スクリーン版とこれを用いた正孔注入層の形成方法および有機発光デバイス
WO2007132965A1 (fr) Dispositif électroluminescent à haute intensité et son mode de production
CN105474754B (zh) 透明电极的制造方法、透明电极及具备该透明电极的有机场致发光元件
JP2006303030A (ja) エレクトロルミネッセンス素子
KR100976618B1 (ko) 무기 이엘 소자
KR101333254B1 (ko) 이엘소자시트 및 그 제조방법
WO2020226051A1 (fr) Dispositif électroluminescent (el) organique
KR101400422B1 (ko) 무기el패널의 발광 구조 및 이를 이용한 디스플레이 장치
JP6387602B2 (ja) 透明電極、透明電極の製造方法、透明電極を備えた有機エレクトロルミネッセンス素子
KR100860282B1 (ko) 전계발광소자와 이의 제조 방법
KR101064166B1 (ko) 무기전계발광소자 및 그 제조방법
US9373810B2 (en) Organic EL element and light-emitting apparatus including the same

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 06798997

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 06798997

Country of ref document: EP

Kind code of ref document: A1