White light emitting organic component

Abstract

A white light-emitting organic component that has the following features: a first light-emitting unit (100) comprising a first light-emitting element (101), wherein the first light-emitting element (101) comprises a blue light-emitting material; a second light-emitting unit (200) comprising a second light-emitting element (201), wherein the second light-emitting element (201) comprises a yellow light-emitting material; and a third light-emitting unit (300) comprising a third light-emitting element (301), wherein the third light-emitting element (301) comprises a yellow light-emitting material; wherein the first light-emitting unit (100), the second light-emitting unit (200) and the third light-emitting unit (300) are arranged in parallel, and wherein the first light-emitting unit (100), the second light-emitting unit (200) and the third light-emitting unit (300) have a common anode (103, 403) and wherein the first light-emitting unit (100), the second light-emitting unit (200) and the third light-emitting unit (300) have a common cathode (102, 402).

Description

[0001] The disclosure relates to the field of organic light emission technology and in particular to a white light-emitting organic component with a wider bandwidth for adjusting a color temperature.

[0002] A white light-emitting organic device (WLOD) is capable of efficiently generating saturated white light and exhibits characteristics such as low driven voltage, good material flexibility, and a large display area. Therefore, WLODs have significant application potential in fields such as information displays and solid-state lighting. However, factors such as high production costs and unstable behavior (inconsistent performance) limit the industrialization of WLODs. From a structural perspective, WLODs are primarily classified as single-layer or multi-layer light-emitting structures.A disadvantage of a single-layer light-emitting diode (LEDD) is its low light emission efficiency. A multi-layer LEDD is used to generate white light using complementary color layers (such as a blue layer and a yellow-orange layer) or to implement white light emission using multiple LED layers of three primary colors: red, green, and blue. While the multi-layer LEDD exhibits improved performance, and ideal white light can be achieved by controlling each LED layer, the LED layers can have different light emission efficiencies and lifetimes due to varying driven voltages. This can affect the chromaticity coordinates and overall stability.

[0003] The ideal white light is implemented by mixing the three primary colors red, green and blue, and a waveband of the emitted light from materials should cover the entire visible light region so that emission of the full spectrum can be achieved and the light emitted by a prepared component has a saturated color and a high color rendering index (CRI).

[0004] The behavior of the light-emitting organic device (LED) is material-dependent and can also be modified by altering the LED's structure. An optical Fabry-Perot (FP) microcavity effect of the LED results in an increase in the intensity of an emission maximum at a specific wavelength and a narrowed band, enabling wavelength tunability and color tunability (for color displays). The LED exhibiting this microcavity effect has a structure capable of selecting an optical mode based on its microcavity, thus allowing for narrowband emission at a specific wavelength.

[0005] The organic light-emitting diode (OLED) consists of an anode, a cathode, and an organic layer containing a light-emitting layer. To improve electron / hole transport and balance, the OLED typically includes an electron / hole transport layer and an electron / hole injection layer. Fabricating the microcavity-structured OLED requires a suitable optical length for the cavity and a resonant cavity with reflectors for back-and-forth reflection of the light. One of these reflectors is typically formed by a metal electrode within the OLED.

[0006] US 2014 / 0 110 682 A1 shows a pixel structure of an electroluminescent display field with a first subpixel area and a second subpixel area. The pixel structure includes a first organic light-emitting layer located in the first subpixel area and in the second subpixel area. The first organic light-emitting layer is a single-layer organic light-emitting layer consisting of a single organic light-emitting material.

[0007] US 2013 / 0 320 308 A1 discloses an organic light-emitting display device comprising a substrate and subpixels formed on the substrate, each of the subpixels having an emission layer consisting of a first host layer of a first host material, a mixed layer of the first host material, a doping material and a second material, and a second host layer of the second host material.

[0008] US 2012 / 0 037 888 A1 discloses a radiation-emitting device comprising a substrate, a first electrode and a second electrode, and an emitter layer arranged between the first and second electrodes. The emitter layer consists of a matrix material, a radiation-emitting emitter, and a phosphorescent exciton collector.

[0009] The object of the present invention is to create a white light-emitting organic component with improved features.

[0010] This problem is solved by a white light-emitting organic component according to claim 1.

[0011] In light of the above, a white light-emitting organic component and a lighting device are provided.

[0012] The white light-emitting organic component comprises: a first light-emitting unit comprising a first light-emitting element, wherein the first light-emitting element comprises a blue light-emitting material; a second light-emitting unit comprising a second light-emitting element, wherein the second light-emitting element comprises a yellow light-emitting material; and a third light-emitting unit comprising a third light-emitting element, wherein the third light-emitting element comprises a yellow light-emitting material, wherein the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit are arranged in parallel.

[0013] Each light-emitting unit comprises a cathode and an anode, an optical microcavity of each light-emitting unit is formed between the reflective surfaces of the anode and the cathode of the light-emitting unit, and an optical length of each optical microcavity is adjusted to cause each light-emitting unit to emit light of an expected wavelength.

[0014] Light emitted by the three light-emitting units is mixed on a light-catching surface to obtain white light.

[0015] Preferred embodiments of the present invention are explained in more detail below with reference to the accompanying drawings. These show: Fig. 1(a) a schematic top view of a white light-emitting organic component according to an embodiment of the disclosure; Fig. 1(b) a schematic sectional view of a white light-emitting organic component according to an embodiment of the disclosure; Fig. 2 a schematic sectional view of a first light-emitting unit of a white light-emitting organic component according to a preferred embodiment of the disclosure; and Fig. 3 a schematic sectional view of a white light emitting organic component according to a preferred embodiment of the disclosure.

[0016] For a better understanding of the technical content of this disclosure, the technical content is described below by means of exemplary embodiments of the disclosure in conjunction with the drawings. The drawings and the exemplary embodiments do not constitute a limitation of the disclosure, and ordinary persons skilled in the art may make some modifications and improvements within the framework of the principle of the disclosure; therefore, the scope of protection of the disclosure should be subject to the scope of protection limited by the claims.

[0017] Fig. Figure 1(a) is a schematic top view of a white light-emitting organic component according to an embodiment of the disclosure. Fig. 1(b) is a schematic sectional view of a white light-emitting organic component according to an embodiment of the disclosure. With reference to Fig. 1(a) and Fig. 1(b) comprises the white light-emitting organic component according to the embodiment of the disclosure: a substrate 10, a first light-emitting unit 100, a second light-emitting unit 200, and a third light-emitting unit 300. The first light-emitting unit 100, the second light-emitting unit 200, and the third light-emitting unit 300 are arranged in parallel on the substrate 10. The first light-emitting unit 100 comprises a first light-emitting element 101, the second light-emitting unit 200 comprises a second light-emitting element 201, and the third light-emitting unit 300 comprises a third light-emitting element 301.

[0018] The light-emitting units of the white light-emitting organic component according to the embodiment of the disclosure are arranged in parallel on the substrate, which can ensure voltage stability for the light-emitting units, so that each light-emitting unit has a more stable light emission efficiency, and thus performance characteristics such as color stability and color purity of light emitted by the light-emitting component are better.

[0019] White light from the white light-emitting organic component can be achieved by mixing complementary colors. Therefore, the first light-emitting element can be a blue light-emitting material, and both the second and third light-emitting elements can be yellow light-emitting materials. The blue light-emitting material can be the blue phosphorescent material Fir6(Firpic): mCP, i.e., Bis[2-(4,6-difluorophenyl)pyridinato-C2,N](picolinato)iridium(III): 1,3-Di-9-carbazolylbenzene. The yellow light-emitting material can be the yellow phosphorescent material Ir(2-phq)2(acac): CBP, i.e., Tris(2-phenylquinoline-C 2,N')iridium(III): 4,4'-Bis(N-carbazolyl)-1,1'-biphenyl. A maximum position in the intrinsic emission spectrum of the blue light-emitting material lies between 430 nm and 480 nm, and a maximum position in the intrinsic emission spectrum of the yellow light-emitting material lies between 560 nm and 600 nm. Furthermore, for the convenience of the manufacturing process, the second and third light-emitting elements can comprise the same yellow light-emitting material.

[0020] The light emission efficiency of the yellow light-emitting material is high, therefore the light emission efficiency of the white light-emitting organic component can be improved by using a complementation of blue light and yellow light to implement white light emission.

[0021] If the first light-emitting element uses the blue light-emitting material, and the second and third light-emitting elements use the yellow light-emitting material, the structures of the light-emitting units can be further improved to obtain white light by mixing three primary colors: red, green, and blue. A preferred embodiment is described in detail below with reference to the structure of the light-emitting unit.

[0022] Fig. Figure 2 is a schematic sectional view of a first light-emitting unit of a white light-emitting organic component according to the preferred embodiment of the disclosure. With reference to Fig. 2 The first light-emitting unit 100 comprises a cathode 102 and an anode 103, and the first light-emitting element 101 is arranged between the cathode 102 and the anode 103. The first light-emitting unit may further comprise a hole injection layer 104, a hole transport layer 106, an electron injection layer 105, and an electron transport layer 107. These layers may improve the transport and equilibrium of electrons or holes.

[0023] By designing the structure of the light-emitting unit, the tunability of a wavelength can be implemented using an optical microcavity. To form the optical microcavity in the light-emitting unit, a resonant cavity with reflectors, in which light is reflected back and forth, is required. The reflectors of the resonant cavity of the first light-emitting unit 100 are achieved by the reflective surfaces of the cathode 102 and the anode 103. Therefore, the anode 103 comprises a conductive material that exhibits reflective properties. The anode 103 can have a single-layer conductive material structure, and the conductive material can be a metal such as silver, gold, nickel, or platinum, or it can be a transparent conductive oxide such as ITO or ZnO.Alternatively, the anode 103 can have a multilayer structure such as Al / ITO, Ag / ITO, Al / Ni, or Al / Pt. Regardless of whether the anode 103 has a single-layer or multilayer structure, if it comprises a metal layer, the reflective surface of the anode 103 is the metal layer closest to the first light-emitting element 101. If the anode 103 comprises only transparent conductive material, the reflective surface of the anode 103 is the layer closest to the first light-emitting element 101, and this reflective surface forms a reflector of the resonant cavity. Similarly, the cathode 102 comprises conductive material with reflective properties.The cathode 102 can comprise a magnesium-silver alloy or a lithium-aluminum alloy, or it can comprise a transparent conductive material such as ITO. Likewise, the cathode 102 can have a single-layer or a multi-layer structure. If the cathode 102 comprises a metal layer, the reflective surface of the cathode 102 is the metal layer of the cathode 102 that is closest to the first light-emitting element 101; if the cathode 102 comprises only transparent conductive material, the reflective surface of the cathode 102 is the layer of the cathode 102 that is closest to the first light-emitting element 101, and the reflective surface of the cathode 102 forms another reflector of the resonant cavity.In an organic light-emitting device with emission on the top side, the anode typically comprises a conductive metal material and exhibits good reflection behavior, and the cathode typically comprises a transparent conductive material to ensure light transmission and exhibits semi-reflectivity behavior.

[0024] The reflective surfaces of the cathode 102 and the anode 103 of the first light-emitting unit 100 form the resonant cavity with reflectors of the first light-emitting unit 100, i.e., an optical microcavity. Before the structure of the optical microcavity of the first light-emitting unit 100 is described, the optical length of the optical microcavity is described.

[0025] The optical length L of the optical microcavity is calculated using the following formula (1): L=λ2(neffΔn)+∑inidi+|Φmλ4π| where λ is a wavelength in free space, n eff an effective refractive index of distributed Bragg reflectors (DBRs), Δn is a difference between a high refractive index and a low refractive index of DBRs, n i and d i a refractive index or a thickness of an i.th layer in the optical microcavity and Φ mThis is a phase shift of the metal reflector. The first element of the formula for optical length represents an effective tunneling depth of light relative to the DBR, the second element represents the total optical thickness of the optical microcavity, and the third element represents an optical length caused by a phase shift of the light relative to the metal reflector. Compared to the value of the second element, the values ​​of the first and third elements are very small; therefore, in practice, the first and third elements may not be considered when designing the structure of the optical microcavity.

[0026] Therefore, when designing the optical length of the optical microcavity of the light-emitting unit, reference is made to the following formula (2): L−∑inidi

[0027] In a case where the wavelength of light satisfies the following formula (3), an optical resonance state of the cavity is achieved: mλm2=L where m is a positive integer, λ m , a maximum wavelength of light emission for the microcavity is and λ min a region of the emission spectrum of the light-emitting unit without a microcavity, and L is an optical length of the optical microcavity. From formula (3), it can be seen that the maximum may shift, since the wavelength satisfying the resonance is not the same as a maximum wavelength of the organic light-emitting unit without a microcavity. For optical microcavities with different structures, the optical length can be determined using appropriate formula elements, and the emission wavelength of the light-emitting unit with an optical microcavity is finally determined using formula (2) and formula (3).

[0028] Formula (2) and formula (3) can be combined to form the following formula (4): ∑inidi=λm2m

[0029] By designing a proper optical length for the optical microcavity, the maximum wavelength of light emission from the optical microcavity can be shifted within a bandwidth of the emission spectrum of the organic light-emitting unit without an optical microcavity.

[0030] In a preferred embodiment of the disclosure, the first light-emitting unit 100 is designed to emit blue light, and the maximum wavelength of the light emission from the first light-emitting unit 100 lies within a wavelength range of blue light, i.e., a range between 430 nm and 480 nm.

[0031] The optical microcavity is formed between the reflecting surfaces of the anode 103 and the cathode 102 of the first light-emitting unit 100, and the optical microcavity of the first light-emitting unit 100 satisfies the following formula (5): ∑inBidBi=λB2mB where n Bi a refractive index of an i.th layer in the optical microcavity of the first light-emitting unit is 100, d Bi a thickness of the i.th layer in the optical microcavity of the first light-emitting unit is 100, λ B a wavelength of blue light, which is determined to be emitted by the first light-emitting unit, 100, and m B a module of the optical microcavity of the first light-emitting unit 100, which is a positive integer.

[0032] The optical microcavity of the first light-emitting unit 100 comprises the first light-emitting element 101 and may also include the hole injection layer 104, the hole transport layer 106, the electron injection layer 105, and the electron transport layer 107. Furthermore, if a transparent conductive layer is arranged on the reflective surface of the cathode 102, which is located near the first light-emitting element 101, or if a transparent conductive layer is arranged on the reflective surface of the anode 103, which is located near the first light-emitting element 101, the thickness of the transparent conductive layer is included in the optical length of the optical microcavity.

[0033] Furthermore, it can be seen from the optical resonance formula (3) that the maximum wavelength of a light emission from the microcavity should lie in a region of the emission spectrum of the first light-emitting unit 100 without a microcavity, therefore λ B in formula (5) in a wavelength range of an intrinsic emission spectrum of the first light-emitting element 101.

[0034] m B is a module of the optical microcavity of the first light-emitting unit 100, which is a positive integer. Theoretically, m B can be any integer and can be selected based on an overall consideration of the process, the lifetime of the component, the efficiency and the behavior of the component, which is not described in detail here.

[0035] The structure of the second light-emitting unit is similar to that of the first. An optical microcavity is formed between the reflective surfaces of an anode and a cathode of the second light-emitting unit. The second light-emitting unit differs from the first in that it is designed to emit green light; that is, the maximum wavelength of light emission from the second light-emitting unit lies, according to a preferred embodiment of the disclosure, in a bandwidth between 500 nm and 560 nm. Light emitted intrinsically by the second light-emitting unit is yellow light; that is, the light emitted by the second light-emitting unit without a microcavity is yellow light.Since wavelengths of green and red light exist within the spectrum of yellow light, a suitable optical microcavity can be designed to cause the maximum wavelength of the yellow light emitted by the second light-emitting element to have a blueshift, and the maximum wavelength of the light ultimately emitted by the second light-emitting unit to lie within a wavelength range of green light. The optical microcavity of the second light-emitting unit satisfies the following formula (6):. ∑inGidGi=λG2mG where n Gi a refractive index of an i.th layer in the optical microcavity of the second light-emitting unit is, d Gi a thickness of the i.th layer in the optical microcavity of the second light-emitting unit is, λ Ga wavelength of green light, which is determined to be emitted by the second light-emitting unit, and m G a module of the optical microcavity of the second light-emitting unit, which is a positive integer.

[0036] Similarly, the optical microcavity of the second light-emitting unit includes the second light-emitting element and may also include a hole injection layer, a hole transport layer, an electron injection layer, and an electron transport layer. Furthermore, if a transparent conductive layer is placed on a reflective surface of the cathode located near the second light-emitting element, or if a transparent conductive layer is placed on a reflective surface of the anode located near the second light-emitting element, the thickness of the transparent conductive layer is included in the optical length of the optical microcavity.

[0037] Furthermore, it can be seen from the optical resonance formula (3) that the maximum wavelength of a light emission from the microcavity should lie in a region of an emission spectrum of the second light-emitting unit without a microcavity, therefore λ G in formula (6) in a wavelength range of an intrinsic emission spectrum of the second light-emitting element.

[0038] m G is a module of the optical microcavity of the second light-emitting unit, which is a positive integer. Theoretically, m G can be any integer and can be selected based on an overall consideration of the process, the lifetime of the component, the efficiency and the behavior of the component, which is not described in detail here.

[0039] The structure of the third light-emitting unit is also similar to the structure of the first light-emitting unit. An optical microcavity is formed between the reflective surfaces of an anode and a cathode of the third light-emitting unit. The third light-emitting unit differs from the first light-emitting unit in that it is designed to emit red light; that is, according to a preferred embodiment of the disclosure, the maximum wavelength of light emission from the third light-emitting unit lies in a bandwidth between 600 nm and 650 nm. Light emitted intrinsically by the third light-emitting unit is yellow light; that is, the light emitted by the third light-emitting unit without a microcavity is yellow light.Since wavelengths of green and red light exist within a spectral region of yellow light, a suitable optical microcavity can be designed to cause the maximum wavelength of the yellow light emitted by the third light-emitting element to have a redshift, and the maximum wavelength of the light ultimately emitted by the third light-emitting unit to lie within a wavelength region of red light. The optical microcavity of the third light-emitting unit satisfies the following formula (7):. ∑inRidRi=λR2mR where n Ri a refractive index of an i.th layer in the optical microcavity of the third light-emitting unit is, d Ri a thickness of the i.th layer in the optical microcavity of the third light-emitting unit is, λ Ra wavelength of red light, which is determined to be emitted by the third light-emitting unit, and m R a module of the optical microcavity of the third light-emitting unit, which is a positive integer.

[0040] Similarly, the optical microcavity of the third light-emitting unit includes the third light-emitting element and may also include a hole injection layer, a hole transport layer, an electron injection layer, and an electron transport layer. Furthermore, if a transparent conductive layer is placed on a reflective surface of the cathode located near the third light-emitting element, or if a transparent conductive layer is placed on a reflective surface of the anode located near the third light-emitting element, the thickness of the transparent conductive layer is included in the optical length of the optical microcavity.

[0041] Furthermore, it can be seen from the optical resonance formula (3) that a maximum wavelength of light emission from the microcavity should lie in a region of an emission spectrum of the third light-emitting unit without a microcavity, therefore λ R in formula (7) in a wavelength range of an intrinsic emission spectrum of the third light-emitting element.

[0042] m R is a module of the optical microcavity of the third light-emitting unit, which is a positive integer. Theoretically, m R can be any integer and can be selected based on an overall consideration of the process, the lifetime of the component, the efficiency and the behavior of the component, which is not described in detail here.

[0043] In a preferred embodiment of the disclosure, white light is obtained by mixing three primary colors—red, green, and blue—by adjusting the structure of each light-emitting unit. This achieves emission of a full spectrum, and light emitted by a prepared white light-emitting organic component exhibits saturated color and a high color temperature index (CIR). Furthermore, since the light emission efficiency of yellow light-emitting material is high, white light is obtained, according to a preferred embodiment of the disclosure, by mixing three primary colors—red, green, and blue—for the white light-emitting organic component, while maintaining the high light emission efficiency. In addition, the degree of adjustment of the ratios of the primary colors is greater, and the color temperature of the resulting white light exhibits a wider range.

[0044] Conditions that the structures of the light-emitting units should meet are discussed above. If these conditions are met, the first light-emitting unit 100, the second light-emitting unit 200, and the third light-emitting unit 300 can each be made of different materials. However, for the convenience of the process, the first light-emitting unit 100, the second light-emitting unit 200, and the third light-emitting unit 300 can share a common anode. The first light-emitting unit 100, the second light-emitting unit 200, and the third light-emitting unit 300 can share a common cathode. The hole injection layers of the first light-emitting unit 100, the second light-emitting unit 200, and the third light-emitting unit 300 can be made of the same material.The hole transport layers of the light-emitting units can be made of the same material. The electron injection layers of the light-emitting units can be made of the same material. The electron transport layers of the light-emitting units can be made of the same material. Fig. Figure 3 is a schematic sectional view of a white light-emitting organic component according to a preferred embodiment of the disclosure. With reference to Fig. With the exception of light-emitting elements, the first light-emitting unit 100, the second light-emitting unit 200, and the third light-emitting unit 300 all have in common layers. An anode 403, a hole injection layer 405, a hole transport layer 407, light-emitting elements, an electron transport layer 406, an electron injection layer 404, and a cathode 402 are stacked sequentially on the substrate 10. The first light-emitting element 101 is made of a blue light-emitting material, which differs from the yellow light-emitting material used by the second light-emitting element 201 and the third light-emitting element 301.The second light-emitting element 201 and the third light-emitting element 301 are made of a yellow light-emitting material, and the second light-emitting element 201 and the third light-emitting element 301 may share this yellow light-emitting material. Since the optical lengths of the optical microcavities of the light-emitting units are different, the layers of the light-emitting units share material, with the respective thicknesses of the layers differing, as shown in . Fig. 3 is not shown.

[0045] An implementation is provided below according to the preferred embodiments of the disclosure.

[0046] The white light-emitting organic device, when implemented, comprises an anode, a first hole injection layer, a second hole injection layer, a hole transport layer, a light-emitting element, an electron transport layer, an electron injection layer, and a cathode, all sequentially stacked on a substrate. The anodes, first hole injection layers, hole transport layers, electron transport layers, electron injection layers, and cathodes of the light-emitting units are made of the same material and have the same thickness.

[0047] The anode comprises a first ITO layer with a thickness of 15 nm, a reflective Ag layer with a thickness of 100 nm and a second ITO layer with a thickness of 15 nm, which are stacked sequentially.

[0048] The first hole injection layers comprise CuPc and have a thickness of 30 nm.

[0049] The hole transport layers comprise 4,4'-cyclohexylidene-bis[N,N-bis(4-methylphenyl)aniline] (TAPC) and have a thickness of 40 nm.

[0050] The electron transport layers comprise 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP) and have a thickness of 30 nm.

[0051] The electron injection layers comprise Liq(8-hydroxyquinolinato-Lithium) and have a thickness of 10 nm.

[0052] The cathodes are formed by a joint evaporation of magnesium and silver and have a thickness of 15 nm.

[0053] The second hole injection layers of the light-emitting units comprise 2,3,6,7,10,11-hexacyano-1,4,5,8,9,12-hexaazatriphenylene (HAT-CN), but have different thicknesses. The thickness of the second hole injection layer of the first light-emitting unit is 60 nm, the thickness of the second hole injection layer of the second light-emitting unit is 100 nm, and the thickness of the second hole injection layer of the third light-emitting unit is 140 nm.

[0054] The first light-emitting element of the first light-emitting unit comprises 5% doped Firpic:mCP, i.e. Bis[2-(4,6-difluorophenyl)pyridinato-C2,N](picolinato)iridium(III): 1,3-Di-9-carbazolylbenzene and has a thickness of 25 nm.

[0055] The second light-emitting element of the second light-emitting unit comprises 4% doped Ir(2-phq)2(acac):CBP, i.e., Tris(2-phenylquinoline-C 2,N')iridium(III): 4,4'-Bis(N-carbazolyl)-1,1'-biphenyl and has a thickness of 30 nm.

[0056] The third light-emitting element of the third light-emitting unit comprises 4% doped Ir(2-phq)2(acac):CBP, i.e., Tris(2-phenylquinoline-C 2 ,N')iridium(III): 4,4'-Bis(N-carbazolyl)-1,1'-biphenyl and has a thickness of 40 nm.

[0057] For the white light-emitting organic device, the maximum wavelength of light emission from the first light-emitting unit is 460 nm, and light with this maximum wavelength is blue light. The maximum wavelength of light emission from the second light-emitting unit is 550 nm, and light with this maximum wavelength is green light. The maximum wavelength of light emission from the third light-emitting unit is 630 nm, and light with this maximum wavelength is red light. Light of these three colors is mixed on a light-capturing surface of the white light-emitting organic device to produce white light.

[0058] The white light-emitting organic component according to the disclosure is applicable to a lighting device. For the lighting device that uses the white light-emitting organic component according to the embodiments of the disclosure, the light emission efficiency is high, the stability is good, the saturation of the emitted white light is good, and the bandwidth for adjusting the color temperature is large.

Claims

[1] White light emitting organic component having the following features: a first light-emitting unit (100) comprising a first light-emitting element (101), wherein the first light-emitting element (101) comprises a blue light-emitting material; a second light-emitting unit (200) comprising a second light-emitting element (201), wherein the second light-emitting element (201) comprises a yellow light-emitting material; and a third light-emitting unit (300) comprising a third light-emitting element (301), wherein the third light-emitting element (301) comprises a yellow light-emitting material; wherein the first light-emitting unit (100), the second light-emitting unit (200) and the third light-emitting unit (300) are arranged in parallel, and wherein the first light-emitting unit (100), the second light-emitting unit (200) and the third light-emitting unit (300) have a common anode (103, 403) and wherein the first light-emitting unit (100), the second light-emitting unit (200) and the third light-emitting unit (300) have a common cathode (102, 402). [2] White light emitting organic component according to claim 1, wherein a position of a maximum of an intrinsic emission spectrum of the first light-emitting element (101) is located between 430 nm and 480 nm and a position of a maximum of an intrinsic emission spectrum of the second light-emitting element (201) and the third light-emitting element (301) is located between 560 nm and 600 nm. [3] White light emitting organic component according to claim 2, wherein the yellow light emitting material of the second light emitting element (201) is the same as the yellow light emitting material of the third light emitting element (301). [4] White light emitting organic component according to claim 3, wherein the first light-emitting unit (100) has the following characteristics: a first cathode (102, 402) and a first anode (103, 403), wherein the first light-emitting element (101) is arranged between the first cathode and the first anode; the second light-emitting unit (200) has the following characteristics: a second cathode (102, 402) and a second anode (103, 403), wherein the second light-emitting element (201) is arranged between the second cathode and the second anode; and The third light-emitting unit (300) has the following characteristics: a third cathode (102, 402) and a third anode (103, 403), wherein the third light-emitting element (301) is arranged between the third cathode and the third anode. [5] White light emitting organic device according to claim 4, wherein the first, second and third anode (103, 403) each have a conductive metal layer and the first, second and third cathode (102, 402) each have a transparent conductive layer. [6] White light emitting organic device according to claim 5, further comprising a hole injection layer (104, 405), a hole transport layer (106, 407), an electron injection layer (105, 404) and an electron transport layer (107, 406) between the first, second and third anode (103, 403) and the first, second and third cathode (102, 402), respectively. [7] White light emitting organic component according to claim 6, wherein the first light-emitting unit (100) is configured to emit blue light and the maximum wavelength of the blue light emitted by the first light-emitting unit (100) is between 430 nm and 480 nm. [8] White light emitting organic device according to claim 7, wherein an optical microcavity is formed between reflecting surfaces of the first anode (103, 403) and the first cathode (102, 402) of the first light emitting unit (100) and the optical microcavity of the first light emitting unit satisfies the following formula: ∑inBidBi=λB2mB where n BI a refractive index of an i.th layer in the optical microcavity of the first light-emitting unit (100) is, d Bi a thickness of the i.th layer in the optical microcavity of the first light-emitting unit (100) is, λ B a wavelength of blue light which is determined to be emitted by the first light-emitting unit (100), and m B a module of the optical microcavity of the first light-emitting unit (100) is a positive integer. [9] White light emitting organic device according to claim 8, wherein the first anode (103, 403) of the first light emitting unit (100) comprises a first ITO layer with a thickness of 15 nm, a reflective Ag layer with a thickness of 100 nm and a second ITO layer with a thickness of 15 nm, which are stacked sequentially; The hole injection layer (104, 105) of the first light-emitting unit (100) has the following features: a first hole injection layer that has CuPc and a thickness of 30 nm, and a second hole injection layer containing 2,3,6,7,10,11-hexacyano-1,4,5,8,9,12-hexaazatriphenylene (HAT-CN) and having a thickness of 60 nm, wherein the first hole injection layer and the second hole injection layer are stacked sequentially; the hole transport layer (106, 407) of the first light-emitting unit (100) has 4,4'-cyclohexylidene-bis[N,N-bis(4-methylphenyl)aniline] (TAPC) and has a thickness of 40 nm; the electron transport layer (107, 406) of the first light-emitting unit (100) 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP) has a thickness of 30 nm; the electron injection layer (105, 404) of the first light-emitting unit (100) has Liq(8-hydroxyquinolinato-Lithium) and a thickness of 10 nm; the first cathode (102, 402) of the first light-emitting unit (100) is formed by a joint evaporation of magnesium and silver and has a thickness of 15 nm; and the first light-emitting element (101) of the first light-emitting unit (100) is 5% doped Firpic:mCP, i.e. Bis[2-(4,6-difluorophenyl)pyridinato-C2,N](picolinato)iridium(III): 1,3-Di-9-carbazolylbenzene and has a thickness of 25 nm. [10] White light emitting organic component according to any one of claims 6 to 9, wherein a spectrum of yellow light emitted by the second light-emitting element (201) of the second light-emitting unit (200) exhibits a blue shift, the second light-emitting unit (200) emits green light and a maximum wavelength of the green light emitted by the second light-emitting unit (200) lies between 500 nm and 560 nm. [11] White light emitting organic device according to claim 10, wherein an optical microcavity is formed between reflecting surfaces of the second anode (103, 403) and the second cathode (102, 402) of the second light emitting unit (200) and the optical microcavity satisfies the following formula: ∑inGidGi=λG2mG where nGI is a refractive index of an i.th layer in the optical microcavity of the second light-emitting unit (200), d GI a thickness of the i.th layer in the optical microcavity of the second light-emitting unit (200) is, λ G a wavelength of green light which is determined to be emitted by the second light-emitting unit (200), and m G a module of the optical microcavity of the second light-emitting unit (200) is a positive integer. [12] White light emitting organic component according to claim 11, wherein the second anode (103, 403) of the second light-emitting unit (200) has a first ITO layer with a thickness of 15 nm, a reflective Ag layer with a thickness of 100 nm and a second ITO layer with a thickness of 15 nm, which are stacked sequentially; The hole injection layer (104, 105) of the second light-emitting unit (200) has the following features: a first hole injection layer that has CuPc and a thickness of 30 nm, and a second hole injection layer comprising 2,3,6,7,10,11-hexacyano-1,4,5,8,9,12-hexaazatriphenylene (HAT-CN) and having a thickness of 100 nm, wherein the first hole injection layer and the second hole injection layer are stacked sequentially; the hole transport layer (106, 407) of the second light-emitting unit (200) has 4,4'-cyclohexylidene-bis[N,N-bis(4-methylphenyl)aniline] (TAPC) and has a thickness of 40 nm; the electron transport layer (107, 406) of the second light-emitting unit (200) contains 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP) and has a thickness of 30 nm; the electron injection layer (105, 404) of the second light-emitting unit (200) has Liq(8-hydroxyquinolinato-Lithium) and a thickness of 10 nm; the second cathode (102, 402) of the second light-emitting unit (200) is formed by a joint evaporation of magnesium and silver and has a thickness of 15 nm; and the second light-emitting element (201) of the second light-emitting unit (200) 4% doped Ir(2-phq)2(acac):CBP, i.e. Tris(2-phenylquinoline-C 2,N')iridium(III): 4,4'-Bis(N-carbazolyl)-1,1'-biphenyl and has a thickness of 30 nm. [13] White light emitting organic component according to any one of claims 6 to 12, wherein a spectrum of yellow light emitted by the third light emitting element (301) of the third light emitting unit (300) has a red shift, the third light emitting unit (300) emits red light and a maximum wavelength of the red light emitted by the third light emitting unit (300) is between 600 nm and 650 nm. [14] White light emitting organic device according to claim 13, wherein an optical microcavity is formed between reflecting surfaces of the third anode (103, 403) and the third cathode (102, 402) of the third light emitting unit (300) and the optical microcavity satisfies the following formula: ∑inRidRi=λR2mR where n Ria refractive index of an i.th layer in the optical microcavity of the third light-emitting unit (300) is, d Ri a thickness of the i.th layer in the optical microcavity of the third light-emitting unit (300) is, λ R a wavelength of red light which is determined to be emitted by the third light-emitting unit (300), and m R a module of the optical microcavity of the third light-emitting unit (300) is a positive integer. [15] White light emitting organic component according to claim 14, wherein the third anode (103, 403) of the third light-emitting unit (300) has a first ITO layer with a thickness of 15 nm, a reflective Ag layer with a thickness of 100 nm and a second ITO layer with a thickness of 15 nm, which are stacked sequentially; The hole injection layer (104, 105) of the third light-emitting unit (300) has the following features: a first hole injection layer that has CuPc and a thickness of 30 nm, and a second hole injection layer comprising 2,3,6,7,10,11-hexacyano-1,4,5,8,9,12-hexaazatriphenylene (HAT-CN) and having a thickness of 140 nm, wherein the first hole injection layer and the second hole injection layer are stacked sequentially; the hole transport layer (106, 407) of the third light-emitting unit (300) has 4,4'-cyclohexylidene-bis[N,N-bis(4-methylphenyl)aniline] (TAPC) and has a thickness of 40 nm; the electron transport layer (107, 406) of the third light-emitting unit (300) 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP) and has a thickness of 30 nm; the electron injection layer (105, 404) of the third light-emitting unit (300) has Liq(8-hydroxyquinolinato-Lithium) and has a thickness of 10 nm; the third cathode (102, 402) of the third light-emitting unit (300) is formed by a joint evaporation of magnesium and silver and has a thickness of 15 nm; and the third light-emitting element (301) of the third light-emitting unit (300) 4% doped Ir(2-phq)2(acac):CBP, i.e. Tris(2-phenylquinoline-C 2 ,N')iridium(III): 4,4'-Bis(N-carbazolyl)-1,1'-biphenyl and has a thickness of 40 nm. [16] White light emitting organic component according to claim 6, wherein at least either: The materials of the hole injection layers (104, 405) of the first light-emitting unit (100), the second light-emitting unit (200), and the third light-emitting unit (300) are the same; and / or The materials of the hole transport layers (106, 407) of the first light-emitting unit (100), the second light-emitting unit (200), and the third light-emitting unit (300) are the same; and / or The materials of the electron injection layers (105, 404) of the first light-emitting unit (100), the second light-emitting unit (200), and the third light-emitting unit (300) are the same; and / or The materials of the electron transport layers (107, 406) of the first light-emitting unit (100), the second light-emitting unit (200) and the third light-emitting unit (300) are the same.

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