KR20140118191A - ultraviolet organic luminescence emitting diode and display device employing the same - Google Patents

Abstract

Disclosed are an ultraviolet organic light emitting device and a display device adopting the same. The ultraviolet organic light emitting device according to the present disclosure includes a reflection electrode, a semi-transparent electrode which is arranged to face the reflection electrode, an ultraviolet organic light emitting layer which is arranged between the reflection electrode and the semi-transparent electrode and emits ultraviolet rays, and an auxiliary resonant layer which has a thickness to generate the resonance of the ultraviolet rays between the reflection electrode and the semi-transparent electrode.

Description

(Ultraviolet organic luminescence emitting diode and display device employing the same)

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultraviolet organic light emitting device and a display device employing the same, and more particularly to an ultraviolet organic light emitting device emitting narrow ultraviolet light and a display device employing the same.

The organic light emitting device includes a hole injecting electrode, an electron injecting electrode, and an organic light emitting layer formed between the hole injecting electrode and the electron injecting electrode. The hole injecting electrode and the electron injecting electrode inject exciton Is a self-emission type device that generates light while falling from an excited state to a ground state.

The wavelength of the light emitted by the organic light emitting device can be varied depending on the band gap energy of the organic material contained in the organic light emitting layer. Since the organic light emitting device is a self light emitting type device, a separate light source is unnecessary, .

The present disclosure provides an ultraviolet organic electroluminescent device that emits ultraviolet rays in a narrow band and provides an ultraviolet organic electroluminescent device capable of promoting the production of vitamin D and a display device employing the same.

An ultraviolet organic light emitting device according to one type,

A reflective electrode;

A translucent electrode disposed opposite to the reflective electrode;

An ultraviolet organic light emitting layer disposed between the reflective electrode and the translucent electrode and emitting ultraviolet light; And

And a resonance assisting layer having a thickness at which resonance of the ultraviolet ray occurs between the reflective electrode and the semi-transparent electrode.

The center wavelength of ultraviolet rays emitted by the ultraviolet organic light emitting layer may be 311 nm to 313 nm.

The bandwidth of the ultraviolet light emitted by the ultraviolet organic light emitting layer may be 1 nm to 5 nm.

The ultraviolet rays emitted by the ultraviolet organic light emitting layer may have a wavelength range that promotes the production of vitamin D.

The ultraviolet organic light emitting layer may include at least one material selected from 2,6,14-tris (diphenylphosphine-oxide) triptycene, bis (2-methylpheyl) diphenylsilane, and 1,4-bis (triphenylsilyl) benzene.

The ultraviolet organic light emitting layer may include at least one selected from the group consisting of a hole injection layer, a hole transport layer, an electron transport layer, and an electron injection layer, and the resonance auxiliary layer may include any one of the hole injection layer, the hole transport layer, And may be made of the same material.

The reflective electrode may include at least one material selected from silver (Ag), aluminum (Al), gold (Au), platinum (Pt), and chromium (Cr).

The translucent electrode may include at least one material selected from the group consisting of magnesium (Mg), silver (Ag), aluminum (Al), gold (Au), platinum (Pt), and chromium (Cr).

A display device according to one type of this disclosure,

Board;

A display disposed on the substrate and displaying an image; And

And an ultraviolet ray emitting part having an ultraviolet organic light emitting element for emitting ultraviolet rays on one side of the display part.

The ultraviolet ray emitting portion may be disposed to surround the periphery of the display portion.

The display unit may include a plurality of organic light emitting devices emitting red, green, blue, or white light.

A polarizing plate may be further disposed on the display unit.

The center wavelength of the ultraviolet ray may be 311 nm to 313 nm.

The bandwidth of the ultraviolet ray may be 1 nm to 5 nm.

The ultraviolet organic light emitting device may be a plurality of ultraviolet light emitting devices.

The ultraviolet organic light emitting device includes: a reflective electrode; A translucent electrode disposed opposite to the reflective electrode; An ultraviolet organic light emitting layer disposed between the reflective electrode and the translucent electrode and emitting ultraviolet light; And a resonance assisting layer having a thickness at which resonance of the ultraviolet ray occurs between the reflective electrode and the semi-transparent electrode.

The display device according to one type may further include a sealing substrate sealing the display portion and the ultraviolet ray emitting portion.

The display device according to one type may further include a sealing film in which the inorganic layer and the organic layer are alternately formed by sealing the display portion and the ultraviolet ray emitting portion.

The display device according to one type may further include a sealing film formed of low-melting-point glass by sealing the display portion and the ultraviolet ray emitting portion.

The display device may be a television, a monitor, or a mobile device.

As described above, the ultraviolet organic light emitting device of the present disclosure has a resonant structure, and can emit narrow band ultraviolet rays. Accordingly, the ultraviolet organic light emitting device can emit only the vitamin D generation promotion harmless harmless to animals or human body.

Further, the display device of the present disclosure employs the above-described ultraviolet organic light emitting element, and by using a display device, vitamin D can be generated in the human body as if it is sunshine.

1 is a cross-sectional view schematically showing an ultraviolet organic light emitting device according to an embodiment of the present disclosure.
2 is a graph schematically illustrating characteristics of an ultraviolet light-emitting device according to an embodiment of the present disclosure.
FIG. 3 is a graph showing the production wavelength region and the erythema induced wavelength region of vitamin D; FIG.
4 is a plan view schematically showing a display device according to an embodiment of the present disclosure.
5 is a cross-sectional view of the display device of FIG. 4 taken along line I-I '.
6 and 7 are cross-sectional views schematically showing a structure for sealing a display device according to an embodiment of the present disclosure.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout, and duplicate descriptions thereof are omitted. In addition, the size of each component may be exaggerated for clarity and convenience of explanation.

On the other hand, the embodiments described below are merely illustrative, and various modifications are possible from these embodiments. For example, when one layer is described as being provided on a "top", "top", or "top" of a substrate or other layer, the layer may be on top of the substrate or other layer directly, Other layers may also be present.

Also, terms used herein are for the purpose of illustrating embodiments and are not intended to limit the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. As used in the specification, "comprises" and / or "comprising" do not exclude the presence or addition of the stated components, steps, operations, and / or elements. The terms first, second, etc. may be used to describe various elements, but the elements should not be limited by terms. Terms are used only for the purpose of distinguishing one component from another.

1 is a cross-sectional view schematically showing an ultraviolet organic light emitting device 100 according to an embodiment of the present disclosure.

1, the ultraviolet organic light emitting device 100 includes a reflective electrode 121, a translucent electrode 122 disposed to face the reflective electrode 121, an ultraviolet organic emission layer 120 that emits ultraviolet light, And a resonance assisting layer 130 for adjusting the distance D between the semitransparent electrode 121 and the translucent electrode 122.

The reflective electrode 121 may be formed of a reflective metal such as silver (Ag), aluminum (Al), gold (Au), platinum (Pt), chromium (Cr), or an alloy containing them. In addition, the reflective electrode 121 may be formed as a double or triple layer including an indium tin oxide (ITO) layer or an indium zinc oxide (IZO) layer on the upper and / or lower surface of the reflective metal layer.

The translucent electrode 122 refers to an electrode through which part of light is transmitted and part of light is reflected. The translucent electrode 122 may be formed of a semipermeable metal. The semipermeable metal may be an alloy of magnesium (Mg) and silver (Ag), and may be a metal such as silver (Ag), aluminum (Al), gold (Au), platinum (Pt) ≪ / RTI > When the semitransparent electrode 122 is formed of the semi-transparent metal, the semitransparent electrode 122 can control the reflectance and transmittance by adjusting the thickness. In some implementations, the translucent electrode 122 may be formed to a thickness capable of achieving a reflectance of 5% or greater and a transmittance of 50% or greater.

The ultraviolet organic light emitting layer 120 is disposed between the reflective electrode 121 and the translucent electrode 122 and includes a light emitting layer (EML) that emits ultraviolet light.

The ultraviolet organic light emitting layer 120 may be formed of a low molecular weight or high molecular organic material. When a low molecular organic material is used, a hole injection layer (HIL), a hole transport layer (HTL), an emission layer (EML), an electron transport layer (ETL) : Electron Injection Layer) may be laminated in a single or composite structure. These low-molecular organic substances can be formed by a vacuum deposition method.

On the other hand, when the ultraviolet organic light emitting layer 120 is formed of a polymer organic material, only the hole transporting layer (HTL) may be included in the light emitting layer (EML). The hole transport layer may be formed by a method such as ink jet printing or spin coating using a polyethylene dihydroxythiophene (PEDOT: poly- (2,4) -ethylene-dihydroxy thiophene) or polyaniline (PANI: 221). In this case, organic organic materials such as poly-phenylenevinylene (PPV) and polyfluorene can be used as the organic material. In addition, the pattern can be formed by a conventional method such as inkjet printing, spin coating, .

The hole injection layer (HIL) may be formed of a phthalocyanine compound such as copper phthalocyanine or starburst type amines such as TCTA, m-MTDATA, m-MTDAPB and the like.

The hole transport layer (HTL) may be formed by a combination of N, N'-bis (3-methylphenyl) -N, N'-diphenyl- [1,1- biphenyl] -4,4'- diamine (TPD) -Di (naphthalene-1-yl) -N, N'-diphenylbenzidine (? -NPD).

The electron injection layer (EIL) may be formed using a material such as LiF, NaCl, CsF, Li2O, BaO, Liq, or the like.

The electron transport layer (ETL) can be formed using Alq ₃ .

The light emitting layer (EML) includes an organic material having a band gap of about 4eV between a highest occupied molecular orbital (HOMO) and a lowest unoccupied molecular orbital (LUMO). Accordingly, ultraviolet light having a peak of about 280 nm to 320 nm can be emitted from the ultraviolet organic light emitting layer 120. For example, the light emitting layer (EML) may include 2,6,14-tris (diphenylphosphine-oxide) triptycene, bis (2-methylpheyl) diphenylsilane and 1,4-bis (triphenylsilyl) benzene.

The resonance assisting layer 130 may be for adjusting the distance D between the reflective electrode 121 and the translucent electrode 122. The distance D between the reflective electrode 121 and the semi-transparent electrode 122 is adjusted so that the light emitted from the ultraviolet organic light emitting layer 120 is resonated between the reflective electrode 121 and the translucent electrode 122 can do.

The thickness d1 of the resonance auxiliary layer 130 may have a thickness d1 at which ultraviolet rays emitted from the ultraviolet organic light emitting layer 120 can resonate between the reflective electrode 121 and the translucent electrode 122. [ Such a thickness may be determined in consideration of the dielectric constant of the organic material forming the ultraviolet organic light emitting layer 120 and the like.

The resonance auxiliary layer 130 may be formed of the same material as any one of the hole injection layer, the hole transport layer, the electron transport layer, and the electron injection layer.

When the ultraviolet light is resonantly formed between the reflective electrode 121 and the semi-transparent electrode 122 by adjusting the thickness d1 of the resonance auxiliary layer 130, the ultraviolet organic light emitting device 100 may emit ultraviolet light having a narrow bandwidth To be released. In some embodiments, the central wavelength of the ultraviolet light emitted by the ultraviolet organic light emitting device 100 may be about 311 nm to 313 nm. In some embodiments, the bandwidth of the ultraviolet light emitted by the ultraviolet organic light emitting device 100 may range from several to several tens of nanometers. For example, the ultraviolet light emitted by the ultraviolet organic light emitting device 100 may have a bandwidth of approximately 1 nm to 10 nm.

2 is a graph schematically illustrating characteristics of the ultraviolet organic light emitting device 100 according to an embodiment of the present disclosure.

Referring to FIG. 2, a graph A shows a case where no resonance is formed between the reflective electrode 121 and the translucent electrode 122. On the other hand, a graph B shows a case where a resonance is formed between the reflective electrode 121 and the translucent electrode 122. It can be seen that comparing the graph A with the graph B shows that the bandwidth in the case where the resonance is formed can be narrower than in the case where the resonance is formed.

The ultraviolet organic light emitting device 100 according to the present disclosure has a center wavelength of approximately 311 nm to 313 nm and may have a narrow bandwidth of several to several tens of nm as shown in graph B by the resonance auxiliary layer 130.

In addition, the ultraviolet rays emitted by the ultraviolet organic light emitting device 100 according to the present disclosure may have a wavelength range band that promotes the production of vitamin D, and may not include a wavelength range harmful to the human body.

FIG. 3 is a graph showing the production wavelength region and the erythema induced wavelength region of vitamin D; FIG.

Referring to FIG. 3, a graph a shows a wavelength region of vitamin D production, and a graph b shows a wavelength region that causes skin erythema. As shown in the graph a, it can be seen that the production wavelength of vitamin D is widely distributed from 250 nm to 315 nm. However, a wavelength region of about 300 nm or less can be seen in a wavelength region (graph b) that causes erythema on the skin and a superimposed state. Accordingly, the wavelength range band in which vitamin D can be synthesized without being harmful to the human body can be a range of approximately 300 nm to 315 nm.

The ultraviolet organic light emitting device 100 of the present disclosure has a central wavelength of about 311 nm to 313 nm and emits ultraviolet rays that promote the generation of vitamin D without being harmful to the human body since it emits ultraviolet rays with a narrow bandwidth.

Such an ultraviolet organic light emitting device 100 can be applied to a phototherapeutic apparatus for vitamin D synthesis. In addition, the ultraviolet organic light emitting device 100 can be applied to various display devices. One embodiment of this is shown in Figs. 4 and 5. Fig.

4 is a plan view schematically showing a display device 1 according to an embodiment of the present disclosure. 5 is a cross-sectional view of the display device 1 of FIG. 4 taken along line I-I '.

4 and 5, the display apparatus 1 includes a display unit 20 on which an image is formed on a substrate 21, and an ultraviolet ray emitting unit 10.

The display device 1 may be a variety of display devices capable of implementing images such as a television (TV), a monitor, and a mobile device.

The display unit 20 is for realizing an image, and a plurality of pixels of red, green, blue, or white may be arranged. Although FIG. 5 shows a case where the organic light emitting devices 200 and 200 'are included to implement the display unit 20, the present invention is not limited thereto. For example, the display unit 20 may be implemented using a liquid crystal.

The ultraviolet ray emitting portion 10 may be disposed on one side of the display portion 20. [ In the figure, the ultraviolet ray emitting portion 10 is disposed so as to surround the periphery, but is not limited thereto. The ultraviolet ray emitting portion 100 may be disposed on the ultraviolet ray emitting portion 10 as described with reference to FIG. In this case, the ultraviolet organic light emitting device 100 may be plural. Thus, the ultraviolet ray emitting portion 10 can emit ultraviolet rays that promote the production of vitamin D.

A polarizing plate (not shown) for suppressing external light reflection may be disposed on the display unit 20, but a polarizing plate (not shown) may not be disposed on the ultraviolet ray emitting unit 10. This is to prevent ultraviolet rays emitted from the ultraviolet ray emitting portion 10 from being absorbed by the polarizer (not shown).

The display device 1 according to the present disclosure includes the ultraviolet ray emitting portion 10, and vitamin D can be generated in the human body as if the display device 1 is used indoors, as in the case of sunlight.

A more specific configuration of the display apparatus 1 will be described with reference to FIG. In FIG. 5, the same reference numerals as in FIG. 1 denote the same members, and a duplicate description thereof will be omitted for the sake of simplicity.

The display device 1 according to the present disclosure includes a substrate 21, a buffer film 211, a thin film transistor TR, organic light emitting elements 200 and 200 'disposed in the display portion 20, an ultraviolet ray emitting portion 10, An ultraviolet ultraviolet organic light emitting device 100 disposed on the substrate 100, and a protective film 233.

The substrate 21 may be a glass substrate, but is not limited thereto, and may be a substrate made of metal or plastic. The substrate 21 may be a flexible substrate that can be bent.

The buffer film 211 prevents impurity ions from diffusing on the upper surface of the substrate 21, prevents penetration of moisture or outside air, and can flatten the surface. In some embodiments, the buffer film 211 is formed of an inorganic material such as silicon oxide, silicon nitride, silicon oxynitride, aluminum oxide, aluminum nitride, titanium oxide, or titanium nitride, or an inorganic material such as polyimide, An organic material or a laminate thereof. The buffer film 211 is not an essential component and may not be provided if necessary.

The thin film transistor TR is composed of an active layer 212, a gate electrode 214, and source / drain electrodes 216 and 217. A gate insulating film 213 for insulating therebetween is interposed between the gate electrode 214 and the active layer 212.

The active layer 212 may be provided on the buffer film 211. The active layer 212 may be an inorganic semiconductor such as amorphous silicon or poly silicon, or an organic semiconductor. In some embodiments, the active layer 212 may be formed of an oxide semiconductor. For example, the oxide semiconductor may be a Group 12, 13, or Group 14 metal such as Zn, In, Ga, Cd, Ge, ≪ / RTI > elements and combinations thereof.

The gate insulating film 213 is provided on the buffer film 211 to cover the active layer 212 and a gate electrode 214 is formed on the gate insulating film 213.

An interlayer insulating film 215 is formed on the gate insulating film 213 so as to cover the gate electrode 214. A source electrode 216 and a drain electrode 217 are formed on the interlayer insulating film 215 to form active layers 212 ) And the contact hole.

The structure of the thin film transistor TR is not limited thereto, and various types of thin film transistor structures are applicable. For example, the thin film transistor TR may have a top gate structure, or may have a bottom gate structure in which a gate electrode 214 is disposed under the active layer 212.

A pixel circuit (not shown) including a capacitor together with the thin film transistor TR may be formed.

A planarizing film 218 covering the pixel circuit including the thin film transistor TR is provided on the interlayer insulating film 215. The planarization layer 218 may have a role of removing the step and planarizing the organic light emitting diode OLED provided thereon in order to increase the luminous efficiency.

The planarization film 218 may be formed of an inorganic material and / or an organic material. For example, the planarization film 218 may be formed of a material selected from the group consisting of a photoresist, an acrylic polymer, a polyimide polymer, a polyamide polymer, a siloxane polymer, a polymer containing a photosensitive acrylic carboxyl group, a novolac resin, A metal oxide selected from the group consisting of silicon nitride, silicon oxynitride, silicon oxynitride, silicon carbonitride, aluminum, magnesium, zinc, hafnium, zirconium, titanium, tantalum, aluminum oxide, titanium oxide, tantalum oxide, magnesium oxide, zinc oxide, hafnium oxide, Oxides and the like.

The organic light emitting devices 200 and 200 'may be a plurality of organic light emitting devices 200 and 200', and the organic light emitting devices 200 and 200 'may be disposed on the planarizing film 218. The organic light emitting devices 200 and 200 'include a first electrode 221, organic light emitting layers 220 and 200', and a second electrode 222. The pixel defining layer 219 is disposed on the planarization layer 218 and the first electrode 221 and defines a pixel region and a non-pixel region.

The organic light emitting layers 220 and 220 'may be formed of a low molecular weight or high molecular organic material. When a low molecular organic material is used, a hole injection layer (HIL), a hole transport layer (HTL), an emission layer (EML), an electron transport layer (ETL) : Electron Injection Layer) may be laminated in a single or composite structure. These low-molecular organic substances can be formed by a vacuum deposition method. At this time, the light emitting layer may be formed independently for each pixel of red (R), green (G), blue (B), and white (W), and the hole injection layer, the hole transport layer, And the like can be commonly applied to red, green, blue, and white pixels as a common layer.

In the case where the organic light emitting layers 220 and 200 'are formed of a polymer organic material, only the hole transporting layer may be included in the direction of the first electrode 221 with the light emitting layer as a center. The hole transport layer may be formed by a method such as ink jet printing or spin coating using a polyethylene dihydroxythiophene (PEDOT: poly- (2,4) -ethylene-dihydroxy thiophene) or polyaniline (PANI: 221). In this case, a polymer organic material such as poly-phenylenevinylene (PPV) or polyfluorene may be used as the organic material. In addition, a color pattern may be formed by a conventional method such as inkjet printing, spin coating, Can be formed.

The hole injection layer (HIL) may be formed of a phthalocyanine compound such as copper phthalocyanine or starburst type amines such as TCTA, m-MTDATA, m-MTDAPB and the like.

The hole transport layer (HTL) may be formed by a combination of N, N'-bis (3-methylphenyl) -N, N'-diphenyl- [1,1- biphenyl] -4,4'- diamine (TPD) -Di (naphthalene-1-yl) -N, N'-diphenylbenzidine (? -NPD).

The electron injection layer (EIL) may be formed using a material such as LiF, NaCl, CsF, Li2O, BaO, Liq, or the like.

The electron transport layer (ETL) can be formed using Alq ₃ .

The light emitting layer (EML) may include a host material and a dopant material.

Examples of the host material include tris (8-hydroxy-quinolinato) aluminum (Alq3), 9,10-di (naphthyl-2-yl) anthracene (AND), 3-tert- Bis (2,2-diphenyl-ethen-1-yl) -4,4'-dimethylphenyl (DPVBi), 4,4'-bis Bis (P-DMDPVBi), Tert (9,9-diarylfluorene) s (TDAF), 2- (9,9 (9,9'-spirobifluoren-2-yl) -9,9'-spirobifluorene (BSDF), 2,7- (TSDF), bis (9,9-diarylfluorene) s (BDAF), 4,4'-bis (2,2- (P-TDPVBi), 1,3-bis (carbazol-9-yl) benzene (mCP), 1,3,5-tris (carbazol-9-yl) benzene (carbazole-9-yl) biphenyl (CBP), 4,4'-bis (carbazole-9-yl) -Bis Bis (9-carbazolyl) -2,2'-dimethyl-biphenyl (CBDP), 4,4'-bis (carbazol- CBP), (9-phenyl-9H-carbazole) fluorene (FL-4CBP), 4,4'-bis (carbazole-9-yl) -9,9-di-tolyl-fluorene (DPFL-CBP) and 9,9-bis (9-phenyl-9H-carbazol) fluorene (FL-2CBP).

Examples of the dopant material include DPAVBi (4,4'-bis [4- (di-p-tolylamino) styryl] biphenyl), ADN (9,10- (3-tert-butyl-9,10-di (naphth-2-yl) anthracene).

The first electrode 221 may be disposed on the planarization layer 218 and may be electrically connected to the drain electrode 217 of the thin film transistor TR through a through hole 208 passing through the planarization layer 218.

The first electrode 221 may function as an anode electrode, and the second electrode 222 may function as a cathode electrode. However, the present invention is not limited to this, and the polarities of the first electrode 221 and the second electrode 222 may be reversed.

When the first electrode 221 functions as an anode electrode, the first electrode 221 may include ITO, IZO, ZnO, or In ₂ O ₃ having a high work function. The first electrode 221 may be formed of Ag, Mg, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, Li, Yb, Ca, or the like. These may be used alone or in combination with each other. In addition, the first electrode 221 may be formed as a single-layer structure or a multi-layer structure including the above-described metal and / or alloy. In some embodiments, the first electrode 221 may comprise an ITO / Ag / ITO structure as a reflective electrode.

When the second electrode 222 functions as a cathode electrode, the second electrode 222 is formed of a metal such as Ag, Mg, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, As shown in FIG. When the display device 1 is of the top emission type, the second electrode 222 should be provided so as to transmit light. In some embodiments, the second electrode 222 may comprise a transparent conductive metal oxide such as ITO, IZO, ZTO, ZnO, or In ₂ O ₃ .

In another embodiment, the second electrode 222 may be formed of a thin film containing at least one material selected from Li, Ca, LiF / Ca, LiF / Al, Al, Ag, Mg, . For example, the second electrode 222 may be formed of a single layer or a stacked structure of Mg: Ag, Ag: Yb and / or Ag. Unlike the first electrode 221, the second electrode 222 may be formed to apply a common voltage across all the pixels.

The pixel defining layer 219 defines a pixel region and a non-pixel region of the organic light emitting diode OLED with a plurality of openings exposing the first electrode 221. The first electrode 221, the organic light emitting layer 220 and the second electrode 222 are sequentially stacked in the opening of the pixel defining layer 219 to allow the organic light emitting layer 220 to emit light. That is, the portion where the pixel defining layer 219 is formed becomes substantially the non-pixel region, and the opening portion of the pixel defining layer substantially becomes the pixel region.

The ultraviolet ray emitting portion 100 may be disposed on the planarizing layer 218 in the ultraviolet ray emitting portion 10.

The reflective electrode 121 of the ultraviolet ultraviolet organic light emitting diode 100 may be electrically connected to the drain electrode 217 of the thin film transistor TR through the through hole 208 passing through the planarization layer 218. [

The reflective electrode 121 may function as an anode electrode and may be formed of the same material as the first electrode 221 of the OLEDs 200 and 200 'of the display unit 20. The translucent electrode 122 may function as a cathode electrode and may be formed of the same material as the second electrode 222 of the organic light emitting devices 200 and 200 'of the display unit 20. In some embodiments, translucent electrode 122 and second electrode 222 may be connected to a common electrode.

A protective layer 223 for protecting the organic light emitting devices 200 and 200 'and the ultraviolet light emitting organic light emitting device 100 may further be formed on the display unit 20 and the ultraviolet ray emitting unit 10. As the protective layer 223, an inorganic insulating film and / or an organic insulating film can be used. As the inorganic insulating film, SiO2, SiNx, SiON, Al2O3, TiO2, Ta2O5, HfO2, ZrO2, BST, PZT and the like can be included. The organic insulating film may be a general general polymer (PMMA, PS), a polymer derivative having a phenolic group, an acrylic polymer, an imide polymer, an arylether polymer, an amide polymer, a fluorine polymer, a p- And blends thereof, and the like. The protective layer 223 may be deposited by various deposition methods such as plasma enhanced chemical vapor deposition (PECVD), atmospheric pressure CVD (APCVD), or low pressure CVD (LPCVD).

6 and 7 are cross-sectional views schematically showing a structure for sealing the display device 1 according to the embodiment of the present disclosure.

Referring to Fig. 6, the sealed display device 2 includes a sealing substrate 23 and a sealing material 24. Fig. Further, the sealed display device 2 may further include a polarizing plate 30 on the sealing substrate 23.

The sealing substrate 23 is formed of a transparent member so that an image from the display unit 20 can be realized and ultraviolet rays can be emitted from the ultraviolet ray emitting unit 10. [ In addition, the sealing substrate 23 can prevent oxygen and moisture from penetrating into the display unit 20 and the ultraviolet ray emitting unit 10.

The substrate 21 and the sealing substrate 23 can be bonded at their edges by the sealing material 24 so that the inner space 25 between the substrate 21 and the sealing substrate 23 can be sealed. A moisture absorbent, a filler, or the like may be disposed in the inner space 25.

The polarizing plate 30 is for suppressing reflection of external light and may be arranged corresponding to the display portion 20. [ The polarizing plate 30 may not be disposed on the ultraviolet ray emitting portion 10. Accordingly, ultraviolet rays emitted from the ultraviolet ray emitting portion 10 can be emitted to the outside without being absorbed by the polarizing plate 30. [

7, the sealed display device 3 includes a sealing film 26 for sealing the display portion 20 and the ultraviolet ray emitting portion 10. The sealed display device 3 of FIG. 7 differs from the sealing substrate 23 of FIG. 6 in that it has a thin sealing film 26.

The sealing film 26 can cover the display portion 20 and the ultraviolet ray emitting portion 10 to protect the display portion 20 and the ultraviolet ray emitting portion 10 from outside air. For example, the sealing film 26 may have a structure in which an inorganic layer made of an inorganic material such as silicon oxide or silicon nitride, and an organic layer made of an organic material such as epoxy or polyimide are alternately formed.

Each of the inorganic layer and the organic layer may be plural.

The organic layer may be formed of a polymer, and preferably a single layer or a laminated layer formed of any one of polyethylene terephthalate, polyimide, polycarbonate, epoxy, polyethylene and polyacrylate. More preferably, the organic layer may be formed of polyacrylate, and specifically includes a polymerized monomer composition comprising a diacrylate monomer and a triacrylate monomer. The monomer composition may further include a monoacrylate monomer. Further, the monomer composition may further include a known photoinitiator such as TPO, but is not limited thereto.

The inorganic layer may be a single film or a laminated film containing a metal oxide or a metal nitride. Specifically, the inorganic layer may comprise any one of _{SiNx, Al 2 O 3, SiO} 2, TiO 2.

The uppermost layer exposed to the outside of the sealing film 26 may be formed of an inorganic layer to prevent moisture permeation to the organic light emitting device.

The sealing film 26 may include at least one sandwich structure in which at least one organic layer is interposed between at least two inorganic layers. In addition, the sealing film 26 may include at least one sandwich structure in which at least one inorganic layer is interposed between at least two organic layers.

The sealing film 26 may include a first inorganic layer, a first organic layer, and a second inorganic layer sequentially from the upper portion of the display portion 20 and the ultraviolet ray emitting portion 10. The sealing film 26 includes a first inorganic layer, a first organic layer, a second inorganic layer, a second organic layer, and a third inorganic layer sequentially from the top of the display portion 20 and the ultraviolet ray emitting portion 10 can do. The sealing film 26 may be sequentially formed from the upper portion of the display portion 20 and the ultraviolet ray emitting portion 10 such that the first inorganic layer, the first organic layer, the second inorganic layer, the second organic layer, 3 organic layer, and a fourth inorganic layer.

A halogenated metal layer including LiF may be further included between the display portion 20 and the ultraviolet ray emitting portion 10 and the first inorganic layer. The metal halide layer can prevent the display unit 20 and the ultraviolet ray emitting unit 10 from being damaged when the first inorganic layer is formed by the sputtering method or the plasma deposition method.

The first organic layer may have a smaller area than the second inorganic layer, and the second organic layer may be smaller in area than the third inorganic layer. The first organic layer may be completely covered with the second inorganic layer, and the second organic layer may be completely covered with the third inorganic layer.

As another example, the sealing film 26 may have a film structure including a low melting glass such as tin oxide (SnO). On the other hand, this is merely exemplary and is not necessarily limited thereto.

The ultraviolet ultraviolet organic light emitting device 100 according to the embodiment of the present disclosure and the display devices 1, 2 and 3 employing the ultraviolet ultraviolet organic light emitting device 100 have been described with reference to the embodiments shown in the drawings for illustrative purposes only, It will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the present invention.

100: ultraviolet organic light emitting element
121: reflective electrode 122: semi-transparent electrode
120: ultraviolet organic light emitting layer 130: resonance auxiliary layer
1, 2, 3: display device
21: substrate, 20: display portion 10: ultraviolet ray emitting portion
23: sealing substrate, 24: sealing material
25: inner space 26: sealing film 30: polarizer
200, 200 ': Organic light emitting device
211: buffer film 212: active layer
213: gate insulating film 214: gate electrode
215: interlayer insulating film 216: source electrode
217: drain electrode 218: planarization film
219: Pixel definition film
220, 220 ': organic light emitting layer
221: first electrode 222: second electrode
223: Protective layer

Claims (20)

A reflective electrode;
A translucent electrode disposed opposite to the reflective electrode;
An ultraviolet organic light emitting layer disposed between the reflective electrode and the translucent electrode and emitting ultraviolet light; And
And a resonance-assisting layer having a thickness at which resonance of the ultraviolet ray occurs between the reflective electrode and the semi-transparent electrode. The method according to claim 1,
Wherein the ultraviolet light emitted from the ultraviolet organic light emitting layer has a center wavelength of 311 nm to 313 nm. The method according to claim 1,
Wherein the ultraviolet light emitted from the ultraviolet organic light emitting layer has a bandwidth of 1 nm to 5 nm. The method according to claim 1,
Wherein the ultraviolet light emitted from the ultraviolet organic light emitting layer has a wavelength region for promoting the production of vitamin D. The method according to claim 1,
Wherein the ultraviolet organic light emitting layer comprises at least one material selected from the group consisting of 2,6,14-tris (diphenylphosphine-oxide) triptycene, bis (2-methylpheyl) diphenylsilane, and 1,4- device. The method according to claim 1,
Wherein the ultraviolet organic light emitting layer comprises at least one selected from a hole injecting layer, a hole transporting layer, an electron transporting layer, and an electron injecting layer,
Wherein the resonance auxiliary layer is made of the same material as any one of the hole injection layer, the hole transport layer, the electron transport layer and the electron injection layer. The method according to claim 1,
Wherein the reflective electrode comprises at least one material selected from silver (Ag), aluminum (Al), gold (Au), platinum (Pt), and chromium (Cr). The method according to claim 1,
Wherein the translucent electrode comprises at least one material selected from the group consisting of magnesium (Mg), silver (Ag), aluminum (Al), gold (Au), platinum (Pt), and chromium (Cr). Board;
A display disposed on the substrate and displaying an image; And
And an ultraviolet ray emitting part having an ultraviolet organic light emitting element for emitting ultraviolet rays to one side of the display part. 10. The method of claim 9,
And the ultraviolet ray emitting portion is disposed so as to surround the periphery of the display portion. 10. The method of claim 9,
Wherein the display unit comprises a plurality of organic light emitting elements emitting red, green, blue or white light. 10. The method of claim 9,
Wherein a polarizing plate is further disposed only on the display portion. 10. The method of claim 9,
And the central wavelength of the ultraviolet ray is 311 nm to 313 nm. 10. The method of claim 9,
And the bandwidth of the ultraviolet ray is 1 nm to 5 nm. 10. The method of claim 9,
Wherein the ultraviolet organic light emitting device is a plurality of display devices. 10. The method of claim 9,
The ultraviolet organic light emitting device includes:
A reflective electrode; A translucent electrode disposed opposite to the reflective electrode; An ultraviolet organic light emitting layer disposed between the reflective electrode and the translucent electrode and emitting ultraviolet light; And a resonance auxiliary layer having a thickness at which resonance of the ultraviolet ray occurs between the reflective electrode and the semi-transparent electrode. 10. The method of claim 9,
And a sealing substrate for sealing the display portion and the ultraviolet ray emitting portion. 10. The method of claim 9,
Further comprising a sealing film in which an inorganic layer and an organic layer are alternately formed by sealing the display portion and the ultraviolet ray emitting portion. 10. The method of claim 9,
And a sealing film formed of a low-melting-point glass by sealing the display portion and the ultraviolet ray emitting portion. 10. The method of claim 9,
Wherein the display device is a television, a monitor, or a mobile device.

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