Panchromatic organic electroluminescence device

Abstract

The invention discloses a panchromatic organic light-emitting device, and belongs to the technical field of light-emitting device production and manufacturing. The panchromatic organic light-emitting device is of a laminated structure and sequentially comprises a control loop layer, a blue light OLED device layer, a first buffer layer, a light extraction and light color conversion function combination layer, a second buffer layer and a packaging layer from bottom to top. The light extraction and light color conversion function combination layer comprises a light extraction function area, a red light color conversion function area, a green light color conversion function area, a red light color conversion material and a green light color conversion material which are organic light-emitting materials with the host and guest matched, and the host material absorbs blue light energy emitted by the blue light device and transmits the energy to the guest material. Therefore, the guest material is excited to emit light, and finally a green, red and blue three-color device is formed. According to the invention, the problems of cors-talk and color shift of a traditional RGB three-primary-color device can be effectively solved; the manufacturing cost of the device can be reduced, the service life of the device is prolonged, and the manufacturing cost performance of the light-emitting device is improved.

Description

Technical Field

[0001] This invention relates to a full-color organic electroluminescent device, belonging to the field of light-emitting device manufacturing technology, and specifically to a full-color organic electroluminescent device prepared using light color conversion technology. Background Technology

[0002] With the continuous development and advancement of OLED technology, OLED display technology has been widely applied in mobile phones, televisions, and computers. Compared with inorganic electroluminescent devices, organic electroluminescent devices have many advantages, including a wider range of material selection, the ability to achieve full-color display from the blue to the red light region, low driving voltage, high luminous brightness and efficiency, wide viewing angle, fast response speed, and ease of achieving large-area and flexible displays. Therefore, they have experienced rapid development in recent years. Currently, research in the field of organic electroluminescent devices is no longer limited to academia; almost all internationally renowned electronics and chemical companies have invested significant human and financial resources in this research field, presenting a situation where research, development, and industrialization are progressing simultaneously. Organic electroluminescent display technology is rapidly moving towards industrialization. At present, a key focus of OLED development is to reduce its manufacturing costs while ensuring the advantages of OLED displays, such as strong color stimulation, wide dynamic range, high brightness, long lifespan, and stable and reliable operation.

[0003] In existing technologies, full-color OLED light-emitting devices are typically manufactured in three different ways: the first is by directly applying an electric field to different OLED light-emitting devices on the pixel matrix to obtain independent red, green, and blue light emission, known as the "red, green, and blue three-primary-color light emission method"; the second is by using different colored filter films to cut the OLED light emission generated by the white OLED light-emitting device in the background to obtain red, green, and blue three-primary-color light emission, known as the "white light plus filter method"; and the third is by using a light color conversion film to absorb the effective OLED light emission components in the ultraviolet, blue, light blue, or white OLED light-emitting devices in the background, converting the high-energy blue light emission into low-energy green or red light to obtain red, green, and blue three-color light emission, known as the "light color conversion method".

[0004] Compared to the two full-color OLED light-emitting device manufacturing methods mentioned earlier, the light color conversion method makes it easier to improve the cost-effectiveness of light-emitting device manufacturing. It can also provide light emission from Lambertian pixels, making the OLED light-emitting device more visually appealing. Summary of the Invention

[0005] To address the problems existing in the prior art, the purpose of this invention is to provide a novel large-size full-color OLED light-emitting device manufactured using a light color conversion method. Specifically, it combines electroluminescence technology and photoluminescence technology, and by introducing light color conversion materials, converts blue light pixels into red light pixels and green light pixels, thereby forming an RGB three-color OLED device.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0007] A full-color organic electroluminescent device, the light-emitting area includes multiple light-emitting sub-pixel areas, each light-emitting sub-pixel area is composed of a red light-emitting pixel unit area, a green light-emitting pixel unit area and a blue light-emitting pixel unit area. The device has a stacked structure and includes, from bottom to top, the following layers: a control circuit layer, a blue OLED device layer, a first buffer layer, a light extraction (CPL or capping layer) and light color conversion function combination layer, a second buffer layer and an encapsulation layer.

[0008] The light extraction and light color conversion function combination layer includes: a light extraction function area disposed in the blue light emitting pixel unit area, a red light color conversion function area disposed in the red light emitting pixel unit area, and a green light color conversion function area disposed in the green light emitting pixel unit area;

[0009] The green light color conversion functional area uses green light color conversion material, the red light color conversion functional area uses red light color conversion material, and both the red light color conversion material and the green light color conversion material are organic light-emitting materials that combine the host material and the guest material.

[0010] Specifically, in the red light color conversion functional area set in the red light emitting pixel unit area and the green light color conversion functional area set in the green light emitting pixel unit area, the host material absorbs the blue light energy emitted by the blue light device, and then transfers the energy to the guest material through the host-guest transfer method, thereby exciting the guest material to emit light, and finally forming a three-color device of green, red and blue light. The absorption spectrum of the host material and the EL spectrum of the blue light OLED device overlap in the organic light emitting materials of the host and guest combination, and the emission spectrum of the host material and the absorption spectrum of the guest material overlap.

[0011] In the aforementioned red light color conversion material and green light color conversion material, the host material is a wide bandgap material, a thermally activated delayed fluorescence material or an excitocomplex material, and the guest material is a boron-nitrogen resonance type thermally activated delayed fluorescence material.

[0012] The guest materials in the red and green light color conversion materials are boron-nitrogen resonance thermally activated delayed fluorescence materials, with the structure shown in formula (1):

[0013]

[0014] In equation (1), R 1 ~R 10 Each group is independently selected from hydrogen, deuterium, halogen, hydroxyl, carboxyl, nitro, cyano, sulfone, sulfoxide, alkynyl, or unsubstituted or R'-substituted groups of the following: C1-C30 chain alkyl, C3-C30 cycloalkyl, C1-C10 alkoxy, C1-C10 thioalkyl, C6-C30 acyl, C6-C30 amino, C6-C30 arylamino, C3-C30 heteroarylamino, C6-C60 monocyclic aryl, C6-C60 fused-ring aryl, C6-C60 aryloxy, C6-C60 arylphosphinyl, C5-C60 monocyclic heteroaryl, C5-C60 fused-ring heteroaryl, C6-C30 alkylsilyl, C6-C30 arylsilyl or C6-C30 heteroarylsilyl;

[0015] The R' is independently selected from one of the following: deuterium, halogen, cyano, C1-C30 chain alkyl, C3-C30 cycloalkyl, C1-C10 alkoxy, C6-C30 arylamino, C3-C30 heteroarylamino, C6-C30 aryl, and C3-C30 heteroaryl.

[0016] In the full-color organic electroluminescent device of the present invention, for the red light color conversion material and the green light color conversion material, the host material includes a wide bandgap host material, a thermally activated delayed fluorescence host material, and an exciton complex host material. The present invention does not limit the specific structure of the host material, wherein the wide bandgap material as the host material can be, but is not limited to, compounds selected from one of the following structures:

[0017]

[0018]

[0019]

[0020] The thermally activated delayed fluorescence material used as the host material may be, but is not limited to, compounds selected from one of the following structures:

[0021]

[0022]

[0023] The donor material of the excitocomplex in the host material may be selected from, but is not limited to, any of the compounds shown in the following structures:

[0024]

[0025]

[0026] The acceptor material of the excitocomplex, which serves as the host material, may be selected from, but is not limited to, any of the compounds shown in the following structures:

[0027]

[0028]

[0029]

[0030] More preferably, in the above formula (1), R 1 ~R 10Each group is independently selected from hydrogen, deuterium, or one or more combinations of the following groups: methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, 2-methylbutyl, n-pentyl, sec-pentyl, cyclopentyl, neopentyl, n-hexyl, cyclohexyl, neohexyl, n-heptyl, cycloheptyl, n-octyl, cyclooctyl, 2-ethylhexyl, trifluoromethyl, pentafluoroethyl, 2,2,2-trifluoroethyl, ethynyl, trimethylsilylethynyl, tert-butylethynyl, triisopropylsilylethynyl, phenyl, tert-butylphenyl, naphthyl, anthracene, benzo[a]anthrayl, phenanthryl, benzo[a]phenanthryl, pyrene, peryl, uryl, fluoranyl, azulene, tetraphenyl, pentaphenyl, benzo[a]pyrene, biphenyl, azabiphenyl, azobiphenyl, terphenyl, Phenylacetyl, naphthylphenyl, phenyl terphenyl, tetraphenyl, fluorenyl, spirodifluorenyl, benzo[a]fluorenyl, dibenzo[a]fluorenyl, dihydrophenanthrene, dihydropyrene, tetrahydropyrene, cis or trans indo[a]fluorenyl, indene, trimerinyl, isotrimerininyl, spirotrimerininyl, spiroisotrimerininyl, triphenylene, furanyl, benzo[a]furanyl, isobenzo[a]furanyl, dibenzo[a]furanyl, thiazolyl Fenyl, benzothiophene, isobenzothiophene, dibenzothiophene, pyrrole, indole, isoindole, benzoindole, carbazole, benzocarbazole, indocarbazole, dibenzocarbazole, pyridyl, bipyridyl, quinolinyl, isoquinolinyl, cenolinyl, quinazolinyl, benzoquinazolinyl, benzodioxanepentenyl, acridine, dihydroacridyl, phenanthridine, benzene benzo-5,6-quinolinyl, benzo-6,7-quinolinyl, benzo-7,8-quinolinyl, pyrazolyl, indazoleyl, imidazoleyl, benzimidazoleyl, naphthomidazoleyl, phenanthrenemidazoleyl, pyridiniumimazoleyl, pyraziniumimazoleyl, quinoxaloylimazoleyl, oxazolyl, isoxazolyl, benzoxazolyl, benzoisoxazolyl, naphthomidazoleyl, anthraquinoxazolyl, phenanthrenemidazoleyl 1,2-Thiazolyl, 1,3-Thiazolyl, benzothiazolyl, benzoisothiazolyl, pyridinyl, benzopyridinyl, pyrimidinyl, benzopyrimidinyl, quinoxalinyl, benzoquinoxalinyl, 5,10-diazathanel, 2,7-diazapyrene, 2,3-diazapyrene, 1,6-diazapyrene, 1,8-diazapyrene, 4,5-diazapyrene, 4 5,9,10-Tetraazaperyl, Pyrazinyl, Phenazinyl, Phenoxazinyl, Phenthiazinyl, Naphridinyl, Azacarbazolyl, Benzocarbazolyl, Phenanthrolinel, 1,2,3-Triazolyl, 1,2,4-Triazolyl, Benzotriazolyl, 1,2,3-Oxadiazolyl, 1,2,4-Oxadiazolyl, 1,2,5-Oxadiazolyl, 1,2,3-Thiadiazolyl 1,2,4-Thiadiazolyl, 1,2,5-Thiadiazolyl, 1,3,4-Thiadiazolyl, 1,3,5-Triazinyl, 1,2,4-Triazinyl, 1,2,3-Triazinyl, Tetrazolyl, 1,2,4,5-Tetrazinyl, 1,2,3,4-Tetrazinyl, 1,2,3,5-Tetrazinyl, Purinyl, Pteridyl, Indazinyl, Benzothiadiazolyl, 9,9-Dimethylacridyl, triarylamine, adamantyl, fluorophenyl, methylphenyl, trimethylphenyl, cyanophenyl, tetrahydropyrrolyl, piperidinyl, methoxy, trisenel, cyclosenel, tetrastyrene, naphthimide, triphenylboryl, cycloheptanetrienyl, trimethylsilyl, triethylsilyl, triisopropylsilyl, triphenylsilyl, dimethylphenylsilyl, diphenylmethylsilyl, or tert-butyldiphenylsilyl.

[0031] Furthermore, in the full-color organic electroluminescent device of the present invention, the boron-nitrogen resonance-type thermally activated delayed fluorescence material is preferably configured to have the structure shown in formula (2):

[0032]

[0033] Wherein group R 9 and R 10 The scope of the definition is the same as that in equation (2);

[0034] Preferably, the R 9 R 10 Each group is independently selected from one of the following groups:

[0035]

[0036]

[0037]

[0038]

[0039]

[0040] in Indicates the linking site of a functional group.

[0041] Preferably, the boron-nitrogen resonance-type thermally activated delayed fluorescence material is selected from the following specific structural compounds, which are only representative examples:

[0042]

[0043]

[0044]

[0045]

[0046]

[0047]

[0048]

[0049]

[0050]

[0051]

[0052]

[0053]

[0054]

[0055]

[0056]

[0057]

[0058]

[0059]

[0060]

[0061]

[0062]

[0063]

[0064]

[0065]

[0066]

[0067]

[0068]

[0069]

[0070]

[0071]

[0072] In an optional embodiment, in the full-color organic electroluminescent device of the present invention, the host material of the organic light-emitting material in the red light color conversion material and the green light color conversion material using a host-guest combination can be a single-component material or a two-component material, and the guest material is a boron-nitrogen resonance thermally activated delayed fluorescence material.

[0073] In an optional embodiment, in the full-color organic electroluminescent device of the present invention, the host material of the organic light-emitting material in the red light color conversion material and the green light color conversion material is a single component, and the doping mass ratio of the guest material in the host material is 1% to 30%, preferably 3% to 10%.

[0074] In an optional embodiment, in the full-color organic electroluminescent device of the present invention, the organic light-emitting material in the red light color conversion material and the green light color conversion material adopts a host-guest combination, wherein the host material is a two-component organic light-emitting material, the mass ratio between the two-component host materials is 1:9 to 9:1, preferably 3:7 to 7:3; the doping mass ratio of the guest material in the host material is 1% to 30%, preferably 3% to 10%.

[0075] In an optional embodiment, in the full-color organic electroluminescent device of the present invention, one of the red light color conversion materials and the green light color conversion materials uses a two-component host material, and the mass ratio between the two-component host materials is 1:9 to 9:1, preferably 3:7 to 7:3; the doping mass ratio of the guest material in the host material is 1% to 30%, preferably 3% to 10%, wherein the other host material is a single-component host material, and the doping mass ratio of the guest material in the host material is 1% to 30%, preferably 3% to 10%.

[0076] In an optional embodiment, in the full-color organic electroluminescent device of the present invention, the main materials used for the red light color conversion material and the green light color conversion material may be the same or different.

[0077] In an optional embodiment, in the full-color organic electroluminescent device of the present invention, the blue OLED device layer includes a first electrode, at least one organic light-emitting functional material film combination layer, and a second electrode. The first electrode is a reflective electrode layer, and the second electrode is a transparent conductive electrode layer. The structural type of the blue OLED device layer is selected from any of the following:

[0078] (1) First electrode / blue organic light-emitting functional material film combination layer / second electrode;

[0079] (2) First electrode / blue organic light-emitting functional material film combination layer / charge generation layer / blue organic light-emitting functional material film combination layer / second electrode;

[0080] (3) First electrode / blue organic light-emitting functional material film combination layer / charge generation layer / blue organic light-emitting functional material film combination layer / charge generation layer / blue organic light-emitting functional material film combination layer / second electrode;

[0081] The blue organic light-emitting functional material film composite layer includes one or more of the following: hole injection layer, hole transport layer, electron blocking layer, light-emitting layer, hole blocking layer, electron transport layer, and electron injection layer, and must include a light-emitting layer.

[0082] In an optional embodiment, in the full-color organic electroluminescent device of the present invention, an isolation pillar is provided between multiple light-emitting sub-pixel areas in the light-emitting region, or no isolation pillar is provided between multiple light-emitting sub-pixel areas in the light-emitting region.

[0083] In an optional embodiment, in the full-color organic electroluminescent device of the present invention, the emission spectrum of the blue OLED device layer is located at 440-470nm, preferably 445-465nm, and the half-width at half-maximum (WHM) of the blue OLED device is ≤60nm, preferably ≤30nm.

[0084] In an optional embodiment, in the full-color organic electroluminescent device of the present invention, the light extraction functional area layer material disposed in the blue light-emitting pixel unit area is an inorganic material or an organic material, with a refractive index ≥1.8 and an extinction coefficient ≤0.1 at a wavelength ≥450nm.

[0085] In an optional embodiment, in the full-color organic electroluminescent device of the present invention, a third buffer layer is filled in the separation area between the green light conversion functional area and the red light conversion functional area. The refractive index of the third buffer layer material is ≤1.4. Specifically, the material of the third buffer layer is the same as or different from the material of the first buffer layer in the full-color organic electroluminescent device of the present invention.

[0086] In an optional embodiment, in the full-color organic electroluminescent device of the present invention, a filter layer may or may not be provided on the light extraction and light color conversion functional combination layer. Specifically, a filter layer may or may not be provided on the light extraction functional area layer provided in the blue light-emitting pixel unit area, a filter layer may or may not be provided on the red light color conversion functional area layer provided in the red light-emitting pixel unit area, and a filter layer may or may not be provided on the green light color conversion functional area layer provided in the green light-emitting pixel unit area.

[0087] In an optional embodiment, in the full-color organic electroluminescent device of the present invention, the materials of the first buffer layer and the second buffer layer are independently selected from organic or inorganic materials with a refractive index ≤1.4 and an extinction coefficient ≤0.1 at a wavelength ≥450nm. Specifically, they are preferably selected from metal fluorides, metal oxides, etc.

[0088] In an optional embodiment, in the full-color organic electroluminescent device of the present invention, the combined layer of light extraction and light color conversion functions can be prepared by vacuum evaporation, laser transfer, inkjet printing, screen printing, or spin coating. Specifically, the light extraction functional area material, the green light color conversion material in the green light color conversion functional area, and the red light color conversion material in the red light color conversion functional area can be prepared independently or simultaneously by vacuum evaporation, laser transfer, inkjet printing, screen printing, or spin coating.

[0089] Compared with the prior art, the present invention has the following advantages:

[0090] This invention relates to a large-size full-color OLED light-emitting device, wherein the blue pixel unit emits light autonomously by a blue OLED device, and the red and green pixel units emit light by blue light generated by the blue OLED exciting red and green light conversion materials, respectively. Compared with the red, green and blue three-primary-color full-color light-emitting method and the white light plus filter full-color light-emitting method, the full-color OLED achieved by the light color conversion method can effectively reduce the difficulty and cost of device manufacturing.

[0091] On the other hand, for light-emitting devices based on three-primary-color or white OLEDs, due to the differences in the performance of red, green, and blue OLED light-emitting materials, the degradation rates of the three color pixels are often not on the same timeline. Full-color OLED displays will inevitably experience color shift degradation, resulting in poor color stability. Therefore, in a sense, this difference between red, green, and blue pixels constitutes a technical bottleneck for the OLED display industry itself and also hinders the development of large-screen display applications. Full-color OLED light-emitting devices prepared using the aforementioned light color conversion technology, since they all use the same blue OLED as the initial light source, do not exhibit the color difference problem of OLED displays.

[0092] Red and green light conversion materials employ a host-guest pairing of fluorescent luminescent materials, effectively converting blue light energy into green or red light, thus improving energy conversion efficiency. Simultaneously, due to the photoluminescence effect, using fluorescent guest materials achieves 100% internal quantum efficiency, effectively enhancing device luminous efficiency. Furthermore, compared to the expensive green and red phosphorescent materials used in traditional RGB three-primary-color devices, fluorescent materials offer better stability. Therefore, the use of host-guest fluorescent materials effectively extends device lifespan and reduces manufacturing costs.

[0093] The light-color conversion material is a fluorescent organic material doped with host and guest components. While maintaining the same device efficiency, it effectively avoids the use of green and red phosphorescent materials, and effectively reduces the device manufacturing cost while maintaining the same device efficiency.

[0094] The key innovation of this invention lies in the use of novel narrow-band boron-nitrogen heterocyclic fluorescent guest materials with multiple resonant boron-nitrogen polar bonds. Compared to existing non-benzene aromatic compounds, these compounds exhibit superior narrow-band emission properties. The emission spectra of these boron-nitrogen heterocyclic compounds have a full width at half maximum (FWHM) as low as 6.4 nm, while achieving a fluorescence quantum yield as high as 97%. Through specific molecular structure design, rigid or highly stereobaric molecular groups are introduced into the molecular structure of boron-nitrogen heterocyclic compounds, enabling further fine-tuning of the spectrum. Their narrow emission spectrum, high luminous efficiency, and good material stability effectively improve device lifetime and suppress severe color shift during long-term operation. This effectively solves the crosstalk and color shift problems of traditional RGB three-primary-color devices; furthermore, it reduces device manufacturing costs and increases device lifetime.

[0095] In addition, the light-color conversion material is transferred to the light-emitting pixels of blue OLED through laser transfer technology, inkjet printing technology, screen printing, and spin coating. These manufacturing processes are relatively simple and inexpensive, which can not only improve the yield of display panels, but also significantly reduce the manufacturing cost of display panels. Attached Figure Description

[0096] Figure 1 This is a schematic diagram of a traditional large-size full-color OLED light-emitting device in the prior art.

[0097] Figure 2 This is a schematic diagram of a large-size full-color OLED light-emitting device with a filter layer provided in an embodiment of the present invention;

[0098] Figure 3 A schematic diagram of a large-size full-color OLED light-emitting device without a filter layer provided in an embodiment of the present invention;

[0099] Figure 4 A schematic diagram of a large-size full-color OLED light-emitting device provided in an embodiment of the present invention, wherein there are no isolation pillars between multiple light-emitting sub-pixel areas in the light-emitting region;

[0100] Figure 5 A schematic diagram of the structure of a blue OLED light-emitting device provided in an embodiment of the present invention (isolation pillars are provided between multiple light-emitting sub-pixel areas in the light-emitting region);

[0101] Figure 6A schematic diagram of the structure of a blue OLED light-emitting device provided in an embodiment of the present invention (without isolation pillars);

[0102] Figure 7 A schematic diagram of AFM with a micro-nano array hemispherical structure on the surface of the combined light extraction and light color conversion function layer provided in this embodiment of the invention;

[0103] Explanation of reference numerals in the attached figures: 1. Control loop; 2. Blue OLED device; 3. First buffer layer; 4. Light extraction functional area layer; 5. Second buffer layer; 6. Encapsulation layer; 7. Green light color conversion functional area layer; 8. Red light color conversion functional area layer; 9. Blue filter layer; 10. Green filter layer; 11. Blue filter layer; 12. Isolation pillar; 13. Third buffer layer; 14. Green OLED device; 15. Red OLED device; 2a. Emitting electrode layer; 2b. Blue organic light-emitting functional material film layer combination; 2c. Transparent electrode layer. Detailed Implementation

[0104] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but the present invention is not limited to the following embodiments.

[0105] This invention provides an organic electroluminescent device. The light-emitting area includes multiple light-emitting sub-pixel areas. Each light-emitting sub-pixel area is composed of a red light-emitting pixel unit area, a green light-emitting pixel unit area, and a blue light-emitting pixel unit area. The device has a stacked structure and includes, from bottom to top, the following layers: a control loop layer 1, a blue OLED device layer 2, a first buffer layer 3, a light extraction (CPL or capping layer) and light color conversion function combination layer, a second buffer layer 5, and an encapsulation layer 6.

[0106] The light extraction and light color conversion function combination layer includes: a light extraction function layer 4 disposed in the blue light emitting pixel unit area, a green light color conversion function layer 7 disposed in the green light emitting pixel unit area, and a red light color conversion function layer 8 disposed in the red light emitting pixel unit area;

[0107] The green light color conversion functional area uses green light color conversion material, the red light color conversion functional area uses red light color conversion material, and both the red light color conversion material and the green light color conversion material are organic light-emitting materials that combine the host material and the guest material.

[0108] Specifically, in the red light color conversion functional area located in the red light-emitting pixel unit area and the green light color conversion functional area located in the green light-emitting pixel unit area, the host material absorbs the blue light energy emitted by the blue light device, and then transfers the energy to the guest material through a host-guest transfer mechanism, thereby exciting the guest material to emit light, ultimately forming a three-color device with green, red, and blue light. The absorption spectrum of the host material in the organic light-emitting material paired with the guest material overlaps with the EL spectrum of the blue OLED device, and the emission spectrum of the host material overlaps with the absorption spectrum of the guest material. The spectral peak value of the blue OLED device is 440–470 nm, preferably 445–465 nm, and the spectral half-width is ≤60 nm, preferably ≤30 nm.

[0109] In the red and green light color conversion materials, the organic light-emitting materials using a host-guest combination can have a host material that is either a single-component material or a two-component material, and the guest material is a boron-nitrogen resonance-type thermally activated delayed fluorescence material.

[0110] Specifically, in the red light color conversion material and the green light color conversion material, the host material of the organic light-emitting material with host-guest combination can be a single component, and the doping mass ratio of the guest material in the host material is 1% to 30%, preferably 3% to 10%.

[0111] Specifically, in the red light color conversion material and the green light color conversion material, the organic light-emitting material using a host-guest combination can also be a two-component organic light-emitting material, with a mass ratio between the two-component host materials of 1:9 to 9:1, preferably 3:7 to 7:3; the doping mass ratio of the guest material in the host material is 1% to 30%, preferably 3% to 10%.

[0112] Specifically, one of the red light color conversion materials and the green light color conversion materials uses a two-component host material with a mass ratio of 1:9 to 9:1, preferably 3:7 to 7:3; the doping mass ratio of the guest material in the host material is 1% to 30%, preferably 3% to 10%. The other host material uses a single-component host material with a doping mass ratio of 1% to 30%, preferably 3% to 10%.

[0113] Specifically, the main materials used in the red light color conversion material and the green light color conversion material can be the same or different.

[0114] Specifically, the structure of a full-color organic electroluminescent device provided in this embodiment of the invention is shown below. Figure 2A blue OLED device layer 2 is disposed on the control loop layer 1. A first buffer layer 3 covers the blue OLED 2. A light extraction functional layer 4 is disposed on the first buffer layer 3 in the light-emitting areas corresponding to the blue OLED pixel units. A green light color conversion functional layer 7 is disposed in the light-emitting areas corresponding to the green OLED pixel units, and a red light color conversion functional layer 8 is disposed in the light-emitting areas corresponding to the red OLED pixel units. A blue filter layer 9, a green filter layer 10, and a red filter layer 11 are disposed on the light extraction functional layer 4, respectively. A third buffer layer 13 is filled in the separation area between the green light color conversion functional layer 7 and the red light color conversion functional layer 8. Next, a second buffer layer 5 is disposed on the blue filter layer 9, the green filter layer 10, and the red filter layer 11. Finally, an encapsulation layer 6 is disposed on the second buffer layer 5.

[0115] Of course, the structure of the full-color organic electroluminescent device provided in the embodiments of the present invention can also be found in [other sources]. Figure 3 In this case, the corresponding positions of the blue, green and red light-emitting pixel units in the light extraction and light color conversion function combination layer may not be covered by the filter layer.

[0116] In the full-color organic electroluminescent device provided in the embodiments of the present invention, see... Figure 2 , 3 And 5, an isolation pillar 12 is provided between multiple light-emitting sub-pixel areas in the light-emitting region, or see 5. Figure 4 and 6 No isolation pillars are provided between the multiple light-emitting sub-pixel areas in the light-emitting area.

[0117] In the full-color organic electroluminescent device provided in this embodiment of the invention, the control circuit layer can adopt AM driving or PM driving mode. When the light-emitting device adopts AM driving, the TFT control circuit needs to be connected to one of the electrode groups. Each TFT circuit controls one pixel light-emitting unit and controls the light emission of the pixel by switching. When the light-emitting device adopts PM driving, the pixel light emission of the light-emitting device is controlled by pulse.

[0118] In the full-color organic electroluminescent device provided in this embodiment of the invention, the materials of the first buffer layer 3 and the second buffer layer 5 are independently selected from organic or inorganic materials with a refractive index ≤1.4 and an extinction coefficient ≤0.1 at a wavelength ≥450nm, preferably from metal fluorides, metal oxides, etc. In this embodiment 1, LiF is preferably used as the buffer layer material.

[0119] In the full-color organic electroluminescent device provided in this embodiment of the invention, the light extraction functional area layer material disposed in the blue light-emitting pixel unit area is an inorganic material or an organic material with a refractive index ≥1.8 and no absorption at a wavelength ≥450nm; in this embodiment 1, CP-1 is preferably used.

[0120] In the full-color organic electroluminescent device provided in this embodiment of the invention, the material used for the TFE encapsulation layer 6 should be capable of effectively preventing oxygen, low molecular weight components, and moisture from penetrating into the OLED, thereby improving the stability of the entire OLED light-emitting device. Encapsulation generally has two methods: single-layer thin-film encapsulation and multi-layer thin-film encapsulation. Single-layer thin-film encapsulation generally utilizes vacuum evaporation technology or plasma chemical vapor deposition (PECVD technology) to prepare a barrier layer on the substrate and device to prevent the penetration of moisture and oxygen. Multi-layer thin-film encapsulation generally uses multi-layer thin-film encapsulation on the polymer substrate and the organic light-emitting device, which is the commonly used Barix encapsulation technology. The TFE encapsulation material can be ultra-thin glass, metal foil, or polymer. In this embodiment 1, single-layer thin-film encapsulation is preferred, using ultra-thin glass and UV adhesive for encapsulation.

[0121] In the full-color organic electroluminescent device provided in this embodiment of the invention, the fabrication process of the green filter layer 10 covering the green light color conversion film layer and the red filter layer 11 covering the red light color conversion film layer can refer to the materials and fabrication process of filter film layers in conventional liquid crystal light-emitting devices. These materials are typically composed of a predetermined pigment dispersed within a photoresist. Filter film layers with different properties are usually fabricated using conventional photolithography methods. Specific core processes include coating, exposure, development, and curing. Besides photolithography, red, green, and blue pixel filter film layers can also be fabricated using printing, letterpress printing, offset printing, and nezzle printing processes.

[0122] Specifically, in the full-color organic electroluminescent device provided in this embodiment of the invention, the main materials used for the red light color conversion material and the green light color conversion material can be the same or different.

[0123] In the full-color organic electroluminescent device provided in this embodiment of the invention, the blue OLED device includes a first electrode, at least one organic light-emitting functional material film combination layer, and a second electrode. A preferred structure in this embodiment is as follows: Figure 5 , Figure 6 As shown, it consists of a reflective electrode layer 2a, a blue organic light-emitting functional material layer 2b, and a transparent electrode layer 2c. The organic light-emitting functional material film layer combination includes one or more of the following: a hole injection layer, a hole transport layer, an electron blocking layer, a light-emitting layer, a hole blocking layer, an electron transport layer, and an electron injection layer, and must include a light-emitting layer.

[0124] Furthermore, the aforementioned blue OLED light-emitting devices can be configured in various ways, as follows:

[0125] (1) First electrode / blue organic light-emitting functional material film layer combination / second electrode;

[0126] (2) First electrode / blue organic light-emitting functional material film layer combination / charge generation layer / blue organic light-emitting functional material film layer combination / second electrode;

[0127] (3) First electrode / Blue organic light-emitting functional material film layer combination / Charge generation layer / Blue organic light-emitting functional material film layer combination / Charge generation layer / Blue organic light-emitting functional material film layer combination / Second electrode;

[0128] In the embodiments, the blue OLED device is a single-layer blue OLED device, a double-layer blue OLED device, or a triple-layer blue OLED device.

[0129] In the aforementioned blue OLED light-emitting device 2, the blue light-emitting layer is composed of a host material and a guest material. Regarding the guest material, two main categories can be listed: fluorescent materials and phosphorescent materials. Compared to fluorescent materials, phosphorescent materials can utilize both singlet and triplet excitons simultaneously during the light-emitting process, theoretically achieving an internal quantum efficiency of 100%, thereby significantly improving the luminous efficiency of the light-emitting device.

[0130] In the aforementioned blue OLED light-emitting device 2, the main material constituting the light-emitting layer of the OLED light-emitting device 2 not only needs to possess bipolar charge transport characteristics, but also needs to have an appropriate energy level to effectively transfer the excitation energy generated by electron-hole recombination to the guest light-emitting material. Such materials include stilbene arylene derivatives, stilbene derivatives, carbazole derivatives, triarylamine derivatives, anthracene derivatives, pyrene derivatives, benzo[a]phenanthrene derivatives, etc.

[0131] In the aforementioned blue OLED light-emitting device 2, the guest light-emitting material can be a simple fluorescent material, a phosphorescent material, or a combination of different fluorescent and phosphorescent materials. Preferably, the blue light emission is generated by the fluorescent material. The blue fluorescent guest material used to generate blue light emission not only needs to possess extremely high fluorescence quantum luminescence efficiency but also needs to have an appropriate energy level to effectively absorb the excitation energy of the host material and emit light. There are no particular limitations on such materials. Examples include stilbene amine derivatives, pyrene derivatives, benzo[a]phenanthrene derivatives, anthracene derivatives, benzo[a]oxazole derivatives, benzo[a]thiazole derivatives, benzimidazole derivatives, chloroform derivatives, diazoxide-phenanthrene derivatives, stilbeneylbenzene derivatives, and tetraphenylbutadiene derivatives. Other examples include tetraphenyl compounds, diphenyl compounds, benzimidazole compounds, benzoxazole compounds, benzoxadiazole compounds, styrene compounds, butadiene compounds, naphthalene dicarboximide compounds, perillene compounds, aldehyde azo compounds, cyclopentadiene compounds, styrene amine compounds, coumarin compounds, aromatic xylene theophylline compounds, and polyphenylene compounds, either individually or in combination of two or more.

[0132] In addition, the host and guest materials used in the OLED light-emitting device 2 to generate blue light can also be compounds disclosed in the following patents or patent applications, including: US patents or patent applications: US20080193797; US20080220285; US20080128009; US20090110957; US20100295444; US20110114889;

[0133] US20110042655; US20110147716; US20110284799; US20120126180; US20120112169;

[0134] US2012011216; US7846558; US8173275. Japanese patents or patent applications: JPA2007223904; JPA2008214332; JPA2008291271; JPA2008545630; JPA2009010181; JPA2009505995; JPA2010238880;

[0135] JPA2010241687; JPA201002776; JPA2011216640; JPA2012080093. International patents or patent applications: WO12007032161; WO12007032162.

[0136] When using fluorescent guests, the mass ratio of blue fluorescent guest material to host and guest materials is 0.1% to 20%.

[0137] In the aforementioned blue OLED light-emitting device 2, the blue light-emitting layer comprises a stacked structure of three organic light-emitting functional material film layers. Adjacent organic light-emitting functional material film layers are connected by a charge generation layer. Its advantage is that it is easy to achieve long lifespan and high efficiency of OLED light-emitting devices. The charge generation layer can be any of the following types: (1) n-type doped organic layer / inorganic metal oxide, such as Bphen:Ag / MoO3, Bphen:Li / MoO3, Alq3:Mg / WO3, BCP:Li / V2O5 and BCP:Cs / V2O5; (2) n-type doped organic layer / organic layer, such as Alq3 (aluminum octahydroxyquinoline):Li / HAT-CN; (3) n-type doped organic layer / p-type doped organic layer, such as BPhen:Ag / NPB:F4-TCNQ, BPhen:Cs / NPB:F4-TCNQ, Alq3:Li / NPB:FeCl3, TPBi:Li / NPB:FeCl3 and Alq3:Mg / m-MTDATA:F4-TCNQ; (4) undoped type, such as F16CuPc / CuPc and Al / WO3 / Au.

[0138] In the aforementioned OLED devices, the materials used to fabricate the first electrode include: an anode with high reflectivity and opacity; this can be a metal, or an alloy of several metals such as Ag, Au, Pd, Pt, Ag:Au, Ag:Pd, Ag:Pt, Al:Au, Al:Pd, Al:Pt, Ag:Au, Au / Ag, Pd / Ag, Pt / Ag, etc. This electrode needs to have good conductivity, high reflectivity, good chemical morphology, and stability. The materials used to fabricate the second electrode include: metal oxides such as zinc oxide, indium oxide, tin oxide, indium tin oxide (ITO), indium zinc oxide, and other similar metal oxides; or metals or alloys of several metals such as Al, Mg, Ca, Li, Yb, Ag, Mg:Ag, Yb:Ag, Mg / Ag, Yb / Ag, Li / Ag, Al / Ag, Ca / Ag, etc. This electrode needs to have good conductivity, good transmittance, good chemical morphology, and stability. The electrode layer can be fabricated by vapor deposition, sputtering or chemical vapor deposition, preferably by sputtering.

[0139] In the aforementioned OLED light-emitting devices, the materials used to fabricate the hole injection layer and hole transport layer can be any of the available materials known in the prior art.

[0140] Here, as electron-donating organic compounds, examples such as N,N',N'-tetraphenyl-4,4'-diaminophenyl, N,N'-diphenyl-N,N'-di(3-methylphenyl)-4,4'-diaminobiphenyl, 2,2-bis(4-di-p-tolylaminophenyl)propane, N,N,N',N'-tetra-p-tolyl-4,4'-diaminobiphenyl, bis(4-di-p-tolylaminophenyl)phenylmethane, N,N'-diphenyl-N,N'-di(4-methoxyphenyl)-4,4'-diaminobiphenyl, N,N,N',N'-tetraphenyl-4,4'-diaminodiphenyl ether, 4,4'-bis(diphenylamino)tetraphenyl, 4-N,N-diphenylamino-(2-diphenylethyl) (Alkenyl)benzene, 3-methoxy-4'-N,N-diphenylaminostyrene, N-phenylcarbazole, 1,1-bis(4-di-p-triaminophenyl)cyclohexane, 1,1-bis(4-di-p-triaminophenyl)-4-phenylcyclohexane, bis(4-dimethylamino-2-methylphenyl)phenylmethane, N,N,N-tri(p-tolyl)amine, 4-(di-p-tolylamino)-4'-[4-(di-p-tolylamino)styrene]stilbene, N,N,N',N'-tetraphenyl-4,4'-diaminobiphenyl, N-phenylcarbazole, 4,4'-bis[N-(1-naphthyl)-N-phenyl-amino]biphenyl, 4,4”-bis[N-(1-naphthyl)-N-phenylamino]p-terphenyl, 4,4 '-bis[N-(2-naphthyl)-N-phenylamino]biphenyl, 4,4'-bis[N-(3-acenaphthyl)-N-phenylamino]biphenyl, 1,5-bis[N-(1-naphthyl)-N-phenylamino]naphthalene, 4,4'-bis[N-(9-anthrayl)-N-phenylamino]biphenylphenylamino]biphenyl, 4,4'-bis[N-(1-anthrayl)-N-phenylamino]-p-terphenyl, 4,4'-bis[N-(2-phenanthyl)-N-phenylamino]biphenyl, 4,4'-bis[N-(8-fluoranthyl)-N-phenylamino]biphenyl, 4,4'-bis[N-(2-pyrene)-N-phenylamino]biphenyl, 4,4'-bis[N-(2-pyrene)-N-phenylamino]biphenyl, 4,4'-bis[N-(2-pyrene)-N-phenylamino]biphenyl, 4,4'-bis[N- -(1-Kinyl)-N-phenylamino]biphenyl, 2,6-bis(di-p-tolylamino)naphthalene, 2,6-bis[di-(1-naphthyl)amino]naphthalene, 2,6-bis[N-(1-naphthyl)-N-(2-naphthyl)amino]naphthalene, 4,4”-bis[N,N-bis(2-naphthyl)amino]terphenyl, 4,4'-bis{N-phenyl-N-[4-(1-naphthyl)phenyl]amino}biphenyl, 4,4'-bis[N-phenyl-N-(2-pyrene)amino]biphenyl, 2,6-bis[N,N-bis-(2-naphthyl)amino]fluorene, or 4,4”-bis(N,N-bis-p-tolylamino)terphenyl, or arylamine compounds such as bis(N-1-naphthyl)(N-2-naphthyl)amine, but this application is not limited thereto.

[0141] The material used as the EBL layer has a triplet (T1) energy level higher than the T1 energy level of the host material in the EML layer, which can block energy loss in the EML layer. The HOMO energy level of the EBL material is between the HOMO energy level of the HTL material and the HOMO energy level of the host material in the EML layer, which facilitates hole injection from the positive electrode into the EML layer. At the same time, the EBL material is required to have high hole mobility to facilitate hole transport and reduce the power consumption of the device. The LUMO energy level of the EBL material is higher than the LUMO energy level of the host material in the EML layer, which acts as an electron blocker, that is, the EBL material is required to have a wide bandgap (Eg). EBL materials that meet the above conditions can be triarylamine derivatives, fluorene derivatives, spirofluorene derivatives, dibenzofuran derivatives, carbazole derivatives, etc. Preferred are triarylamine derivatives, such as N,N-bis(4-(dibenzo[b,d]furan-4-yl)phenyl)-[1,1':4',1”-terphenyl]-4-amine; spirofluorene derivatives, such as N-([1,1'-diphenyl]-4-yl)-N-(9,9-dimethyl-9H-furan-2-yl)-9,9'-spirobis[fluorene]-2-amine; dibenzofuran derivatives, such as N,N-bis([1,1'-biphenyl]-4-yl)-3'-(dibenzo[b,d]furan-4-yl)-[1,1'-biphenyl]-4-amine, but not limited thereto.

[0142] To reduce the driving voltage of blue OLED light-emitting devices and improve their performance, a common practice is to add P-type dopant to the hole injection layer of the OLED light-emitting device to improve carrier conductivity. P-type dopant materials that can be used as P-type dopant materials include: (1) organic materials, such as 2,3,4,5,6-tetrafluoro-7,7',8,8'-tetracyanodimethyl-p-benzoquinone (F4-TCNQ); (2) inorganic materials, such as MoO3, V2O5, Re2O7, FeCl3, and WO3.

[0143] In the aforementioned blue OLED device 2, the material used to fabricate the electron injection layer can be arbitrarily selected from materials of OLEDs possessing electron transport properties. Such materials can be listed as metal complexes of hydroxyquinoline derivatives, various metal complexes, triazole derivatives, triazine derivatives such as 2,4-bis(9,9-dimethyl-9H-fluoren-2-yl)-6-(naphthyl-2-yl)-1,3,5-triazine (CAS No.: 1459162-51-6), imidazole derivatives such as 2-(4-(9,10-bis(naphthyl-2-yl)anthracite-2-yl)phenyl)-1-phenyl-1H-benzo[d]imidazole (CAS No.: 561064-11-7, commonly known as LG201), oxadiazole derivatives, thiadiazole derivatives, carbodiimide derivatives, quinoxaline derivatives, phenanthroline derivatives, and silicon-based compound derivatives.

[0144] Some inorganic metal compound materials can also be used as electron injection layer and electron transport layer materials for blue OLED devices, such as LiF, CsF, Cs2CO3, LiN, Cs3N and other materials.

[0145] To achieve a low-voltage driving effect in the blue OLED device 2, the electron injection layer and electron transport layer of the blue OLED device 2 typically adopt an N-type doped structure. Materials that can be used as N-type dopants include metal materials with low work functions, such as Li, Cs, K, Yb, etc., as well as Ag-doped coordination transport materials containing o-phenanthroline or bipyridine, etc. Other examples include metal oxides, fluorides, or nitrides, such as Li2O, CsF, Li3N, CsN, etc.

[0146] Example 1

[0147] In control loop 1, a reflective electrode layer 2a with a thickness of ITO (7nm) / Ag (100nm) / ITO (7nm) was fabricated by magnetron sputtering, with a film impedance of 9Ω. Subsequently, the reflective electrode layer 2a was patterned, and a first electrode isolation pillar and a second electrode isolation pillar were fabricated on the fabricated reflective electrode. The first electrode isolation pillar has a trapezoidal structure, and the second trapezoidal isolation pillar has an inverted trapezoidal structure. All reflective electrode patterns and the fabrication methods for the first electrode isolation pillars also employed the traditional photolithography process used in LCD panel manufacturing. The photoresist material used for both the first and second electrode isolation pillars was ZPN1168 photoresist material manufactured by Zeon Corporation of Japan.

[0148] After the electrode isolation pillars are fabricated, the OLED light-emitting device fabrication process begins.

[0149] The substrate with the fabricated reflective electrodes needs to undergo pretreatment. The pretreatment process is as follows: 10 -3Under vacuum conditions below Pa, perform UV cleaning at 200°C for 3 minutes.

[0150] In this embodiment 1, the blue OLED light-emitting device of the full-color OLED light-emitting device has a stacked structure, and the materials and specific structure used are as follows:

[0151] Reflective electrode layer 2a (ITO (7nm) / Ag (100nm) / ITO (7nm)) / Hhole injection layer HIT (10nm) / Hhole transport layer HTL (130nm) / Electron blocking layer (10nm) / Blue emitting layer (20nm) / Connector layer (5nm) / Blue emitting layer (20nm) / Electron transport layer (35nm) / Electron injection layer (1nm) / Transparent electrode layer (12nm) (Ag:Mg = 9:1)

[0152] Blue OLED light-emitting units were fabricated:

[0153] Vacuum evaporation is performed under the following conditions: using CIC evaporation equipment (manufactured by Changju Industrial), at a vacuum degree of 10... -5 Under Pa pressure, the evaporation rate is controlled to be

[0154] Follow these steps:

[0155] a) On the reflective electrode layer 2a, the hole transport host material HTL and the P-type doped material P1 are placed in two evaporation sources, under a vacuum degree of 10. -5 Under Pa pressure, the HTL evaporation rate is controlled to be Controlling the deposition rate of p-type doped material 1 to be The HIT of the present invention was obtained by co-evaporation, and its thickness was 10 nm.

[0156] b) A hole transport layer is deposited on the hole injection layer by vacuum evaporation. The hole transport layer material is HTL and the thickness is 60nm.

[0157] c) An electron blocking layer EB with a thickness of 10 nm is deposited on the hole transport layer by vacuum evaporation.

[0158] d) On the electron blocking layer, a light-emitting layer material is deposited by vacuum evaporation. The host material is BH and the guest material is BD. The mass ratio of BH to BD is 95:5 and the thickness is 20nm.

[0159] e) An Alq3:Li / HAT-CN bonding layer with a thickness of 5 nm is deposited on the light-emitting layer by vacuum evaporation.

[0160] f) Repeat step d);

[0161] g) ET-1 and Liq are deposited on the light-emitting layer by vacuum evaporation, with a mass ratio of ET-1 to Liq of 5:5 and a thickness of 35 nm. This layer serves as an electron transport layer.

[0162] h) On the electron transport layer, LiF is deposited by vacuum evaporation with a thickness of 1 nm. This layer is the electron injection layer.

[0163] i) Vacuum evaporation of Ag:Mg with a mass ratio of 9:1 and a thickness of 12nm is performed on the electron injection layer. This layer is a transparent electrode layer.

[0164] j) An 80 nm thick LiF is vacuum-deposited on the transparent electrode layer to form the first buffer layer 3;

[0165] A light extraction layer material CP-1 with a thickness of 60nm is deposited on the first buffer layer 3 of the blue light-emitting pixel unit region by vacuum evaporation to form a blue light extraction layer.

[0166] according to Figure 2 The structure further incorporates green and red color conversion layers in the green and red emitting regions corresponding to the blue OLED. In this embodiment 1, the color conversion layers are doped with host and guest materials and are formed on a donor substrate with a nano-hemispherical structure on its surface using vacuum evaporation technology. In the green color conversion layer, the host material is E-241, the guest material is E-193, the mass ratio of the host material to the guest material is 94:6, and its thickness is 40 nm. In the red color conversion layer, the host material is H-37, the guest material is E-241, the mass ratio of the host material to the guest material is 95:5, and its thickness is 40 nm. Then, the donor substrate covered with the green and red color conversion layers is aligned and attached to the surface of the blue OLED's emitting surface using laser thermal transfer technology. Then, the substrate is exposed with a laser beam to transfer the color conversion material to the surface of the blue light emitting surface.

[0167] After the green light color conversion layer and the red light color conversion layer are fabricated, blue filters, green filters and red filters are attached to the corresponding positions of the blue light extraction layer, the green light color conversion layer and the red light color conversion layer by vacuum bonding.

[0168] Subsequently, in a vacuum environment, LiF was filled into the gaps between the blue light extraction layer, the green light conversion layer, and the red light conversion layer through a vacuum evaporation process, thus isolating each pixel unit.

[0169] Subsequently, an 80nm LiF layer was formed on the blue, green, and red filter layers using a vapor deposition process. Then, a 500nm thick SiN layer was fabricated on the LiF layer using a CVD deposition method, forming the second buffer layer 5.

[0170] On the second buffer layer 5, flexible thin film encapsulation or thin glass cover and UV adhesive filling encapsulation are performed in a nitrogen environment to form the entire full-color OLED light-emitting device.

[0171]

[0172]

[0173] Example 2

[0174] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, with the difference being that the green light host material is H-38, the green light guest material is E-197, and the mass ratio of host material H-38 to guest material E-197 is 90:10; the red light host material is H-37, the red light guest material is E-241, and the mass ratio of red light host material H-37 to red light guest material E-241 is 95:5.

[0175] Example 3

[0176] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, with the difference being that the green light host material is H-38, the green light guest material is E-198, and the mass ratio of host material H-38 to guest material E-198 is 85:15; the red light host material is H-40, the red light guest material is E-326, and the mass ratio of red light host material H-40 to red light guest material E-326 is 95:5.

[0177] Example 4

[0178] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, with the difference being that the green light host material is selected from the dual host materials D-2 and A-3 of the excimer compound, and the green light guest material is selected from E-193, with the mass ratio of the two host materials D-2, A-3 and the guest material E-135 being 47:47:6; the red light host material is selected from H-41, and the red light guest material is selected from E-309, with the mass ratio of the red light host material H-41 and the red light guest material E-309 being 95:5.

[0179] Example 5

[0180] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, with the difference being that the green light host material is selected from dual host materials D-2 and A-3 of the excimer compound, and the green light guest material is selected from E-519, with the mass ratio of the two host materials D-2, A-3 and the guest material E-135 being 28:66:6; the red light host material is selected from H-41, and the red light guest material is selected from E-213, with the mass ratio of the red light host material H-41 and the red light guest material E-213 being 95:5.

[0181] Example 6

[0182] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, with the difference being that the green light host material is selected from dual host materials D-4 and A-5 of the excimer compound, and the green light guest material is selected from E-520, with the mass ratio of the two host materials D-4, A-5 and the guest material E-520 being 66:28:6; the red light host material is selected from H-42, and the red light guest material is selected from E-271, with the mass ratio of the red light host material E-42 and the red light guest material E-271 being 95:5.

[0183] Example 7

[0184] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, with the difference being that the green light host material is selected from dual host materials D-6 and A-7 of the excimer compound, and the green light guest material is selected from E-339, with the mass ratio of the two host materials D-6, A-7 and the guest material E-339 being 66:28:6; the red light host material is selected from H-43, and the red light guest material is selected from E-200, with the mass ratio of the red light host material H-43 and the red light guest material E-200 being 90:10.

[0185] Example 8

[0186] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, with the difference being that the green light host material is selected from dual host materials D-7 and A-8 of the excimer compound, and the green light guest material is selected from E-193, with the mass ratio of the two host materials D-7, A-8 and the guest material E-135 being 66:28:6; the red light host material is selected from H-27, and the red light guest material is selected from E-200, with the mass ratio of the red light host material H-27 and the red light guest material E-200 being 85:15.

[0187] Example 9

[0188] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, with the difference being that the green light host material is selected from dual host materials D-2 and A-3, and the green light guest material is selected from E-468, with the mass ratio of the two host materials D-2 and A-3 to the guest material E-468 being 66:28:6; the red light host material is selected from dual host materials W-2 and W-3, and the red light guest material is selected from E-326, with the mass ratio of the two red light host materials W-2 and W-3 ​​to the red light guest material E-326 being 48.5:48.5:3.

[0189] Example 10

[0190] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, with the difference being that the green light host material is selected from dual host materials D-10 and A-11, and the green light guest material is selected from E-469, with a mass ratio of host material D-10, A-11 and guest material E-469 of 66:28:6; the red light host material is selected from dual host materials W-2 and W-3, and the red light guest material is selected from E-309, with a mass ratio of red light host materials W-2, W-3 and red light guest material E-309 of 29:68:3.

[0191] Example 11

[0192] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, with the difference being that the green light host material is selected from dual host materials D-12 and A-13, and the green light guest material is selected from E-193, with a mass ratio of host material D-12, A-13 and guest material E-193 of 66:28:6; the red light host material is selected from dual host materials W-4 and W-5, and the red light guest material is selected from E-309, with a mass ratio of red light host W-4, W-5 and red light guest E-309 of 68:29:3.

[0193] Example 12

[0194] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, with the difference being that the green light host material is H-5, the green light guest material is E-520, and the mass ratio of host material H-5 to guest material E-520 is 94:6; the red light host material is W-3, the red light guest material is E-241, and the mass ratio of red light host material W-3 to red light guest material E-241 is 95:5.

[0195] Example 13

[0196] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, with the difference being that the green light host material is H-6, the green light guest material is E-338, and the mass ratio of host material H-6 to guest material E-338 is 94:6; the red light host material is W-11, the red light guest material is E-191, and the mass ratio of red light host material W-11 to red light guest material E-191 is 95:5.

[0197] Example 14

[0198] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, with the difference being that the green light host material is selected as W-12, the green light guest material is selected as E-339, and the mass ratio of host material W-12 to guest material E-339 is 94:6; the red light host material is selected as W-3, the red light guest material is selected as E-208, and the mass ratio of red light host material W-3 to red light guest material E-208 is 95:5.

[0199] Example 15

[0200] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, with the difference being that the green light host material is selected as W-13, the green light guest material is selected as E-198, and the mass ratio of host material W-13 to guest material E-198 is 94:6; the red light host material is selected as W-14, the red light guest material is selected as E-213, and the mass ratio of red light host material W-14 to red light guest material E-213 is 95:5.

[0201] Example 16

[0202] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, with the difference being that the green light host material is selected as W-14, the green light guest material is selected as E-197, and the mass ratio of host material W-14 to guest material E-197 is 94:6; the red light host material is selected as W-6, the red light guest material is selected as E-271, and the mass ratio of red light host material W-6 to red light guest material E-271 is 95:5.

[0203] Example 17

[0204] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, with the difference being that the green light host material is selected as W-15, the green light guest material is selected as E-198, and the mass ratio of host material W-15 to guest material E-198 is 94:6; the red light host material is selected as W-16, the red light guest material is selected as E-520, and the mass ratio of red light host material W-16 to red light guest material E-520 is 85:15.

[0205] Example 18

[0206] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, with the difference being that the green light host material is selected as W-15, the green light guest material is selected as E-338, and the mass ratio of host material W-15 to guest material E-338 is 94:6; the red light host material is selected as W-3, the red light guest material is selected as E-200, and the mass ratio of red light host material W-3 to red light guest material E-200 is 95:5.

[0207] Example 19

[0208] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, with the difference being that the green light host material is selected as W-16, the green light guest material is selected as E-520, and the mass ratio of host material W-16 to guest material E-520 is 94:6; the red light host material is selected as W-3, the red light guest material is selected as E-271, and the mass ratio of red light host material W-3 to red light guest material E-271 is 85:15.

[0209] Example 20

[0210] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, with the difference being that the green light host material is selected as W-17, the green light guest material is selected as E-193, and the mass ratio of host material W-17 to guest material E-193 is 85:15; the red light host material is selected as W-6, the red light guest material is selected as E-326, and the mass ratio of red light host material W-6 to red light guest material E-326 is 95:5.

[0211] Example 21

[0212] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, with the difference being that the green light host material is selected as W-18, the green light guest material is selected as E-519, and the mass ratio of host material W-18 to guest material E-519 is 85:15; the red light host material is selected as W-20, the red light guest material is selected as E-208, and the mass ratio of red light host material W-20 to red light guest material E-208 is 95:5.

[0213] Example 22

[0214] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, with the difference being that the green light host material is H-38, the green light guest material is E-58, and the mass ratio of host material H-38 to guest material E-58 is 90:10; the red light host material is H-37, the red light guest material is E-241, and the mass ratio of red light host material H-37 to red light guest material E-241 is 95:5.

[0215] Example 23

[0216] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, with the difference being that the green light host material is H-38, the green light guest material is E-62, and the mass ratio of host material H-38 to guest material E-62 is 85:15; the red light host material is H-40, the red light guest material is E-326, and the mass ratio of red light host material H-40 to red light guest material E-326 is 95:5.

[0217] Example 24

[0218] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, with the difference being that the green light host material is selected from dual host materials D-2 and A-3 of the excimer compound, and the green light guest material is selected from E-70, with the mass ratio of the two host materials D-2, A-3 and the guest material E-135 being 47:47:6; the red light host material is selected from H-41, and the red light guest material is selected from E-309, with the mass ratio of the red light host material H-41 and the red light guest material E-309 being 95:5.

[0219] Example 25

[0220] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, with the difference being that the green light host material is selected from dual host materials D-2 and A-3 of the excimer compound, and the green light guest material is selected from E-201, with the mass ratio of the two host materials D-2, A-3 and the guest material E-135 being 28:66:6; the red light host material is selected from H-41, and the red light guest material is selected from E-213, with the mass ratio of the red light host material H-41 and the red light guest material E-213 being 95:5.

[0221] Example 26

[0222] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, with the difference being that the green light host material is selected from dual host materials D-4 and A-5 of the excimer compound, and the green light guest material is selected from E-508, with the mass ratio of the two host materials D-4, A-5 and the guest material E-508 being 66:28:6; the red light host material is selected from H-42, and the red light guest material is selected from E-271, with the mass ratio of the red light host material E-42 and the red light guest material E-271 being 95:5.

[0223] Example 27

[0224] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, with the difference being that the green light host material is selected from dual host materials D-6 and A-7 of the excimer compound, and the green light guest material is selected from E-518, with the mass ratio of the two host materials D-6, A-7 and the guest material E-518 being 66:28:6; the red light host material is selected from H-43, and the red light guest material is selected from E-200, with the mass ratio of the red light host material H-43 and the red light guest material E-200 being 90:10.

[0225] Example 28

[0226] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, with the difference being that the green light host material is selected from dual host materials D-7 and A-8 of the excimer compound, and the green light guest material is selected from E-70, with the mass ratio of the two host materials D-7, A-8 and the guest material E-135 being 66:28:6; the red light host material is selected from H-27, and the red light guest material is selected from E-200, with the mass ratio of the red light host material H-27 and the red light guest material E-200 being 85:15.

[0227] Example 29

[0228] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, with the difference being that the green light host material is selected from dual host materials D-2 and A-3, and the green light guest material is selected from E-468, with the mass ratio of the two host materials D-2 and A-3 to the guest material E-468 being 66:28:6; the red light host material is selected from dual host materials W-2 and W-3, and the red light guest material is selected from E-326, with the mass ratio of the two red light host materials W-2 and W-3 ​​to the red light guest material E-326 being 48.5:48.5:3.

[0229] Example 30

[0230] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, with the difference being that the green light host material is selected from dual host materials D-10 and A-11, and the green light guest material is selected from E-469, with a mass ratio of host material D-10, A-11 and guest material E-469 of 66:28:6; the red light host material is selected from dual host materials W-2 and W-3, and the red light guest material is selected from E-309, with a mass ratio of red light host materials W-2, W-3 and red light guest material E-309 of 29:68:3.

[0231] Example 31

[0232] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, with the difference being that the green light host material is selected from dual host materials D-12 and A-13, and the green light guest material is selected from E-70, with a mass ratio of host material D-12, A-13 and guest material E-70 of 66:28:6; the red light host material is selected from dual host materials W-4 and W-5, and the red light guest material is selected from E-309, with a mass ratio of red light host W-4, W-5 and red light guest E-309 of 68:29:3.

[0233] Example 32

[0234] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, with the difference being that the green light host material is H-5, the green light guest material is E-508, and the mass ratio of host material H-5 to guest material E-508 is 94:6; the red light host material is W-3, the red light guest material is E-241, and the mass ratio of red light host material W-3 to red light guest material E-241 is 95:5.

[0235] Example 33

[0236] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, with the difference being that the green light host material is H-6, the green light guest material is E-338, and the mass ratio of host material H-6 to guest material E-338 is 94:6; the red light host material is W-11, the red light guest material is E-191, and the mass ratio of red light host material W-11 to red light guest material E-191 is 95:5.

[0237] Example 34

[0238] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, with the difference being that the green light host material is selected as W-12, the green light guest material is selected as E-518, and the mass ratio of host material W-12 to guest material E-518 is 94:6; the red light host material is selected as W-3, the red light guest material is selected as E-208, and the mass ratio of red light host material W-3 to red light guest material E-208 is 95:5.

[0239] Example 35

[0240] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, with the difference being that the green light host material is selected as W-13, the green light guest material is selected as E-62, and the mass ratio of host material W-13 to guest material E-62 is 94:6; the red light host material is selected as W-14, the red light guest material is selected as E-213, and the mass ratio of red light host material W-14 to red light guest material E-213 is 95:5.

[0241] Example 36

[0242] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, with the difference being that the green light host material is selected as W-14, the green light guest material is selected as E-58, and the mass ratio of host material W-14 to guest material E-58 is 94:6; the red light host material is selected as W-6, the red light guest material is selected as E-271, and the mass ratio of red light host material W-6 to red light guest material E-271 is 95:5.

[0243] Example 37

[0244] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, with the difference being that the green light host material is selected as W-15, the green light guest material is selected as E-62, and the mass ratio of host material W-15 to guest material E-62 is 94:6; the red light host material is selected as W-16, the red light guest material is selected as E-508, and the mass ratio of red light host material W-16 to red light guest material E-508 is 85:15.

[0245] Example 38

[0246] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, with the difference being that the green light host material is selected as W-15, the green light guest material is selected as E-338, and the mass ratio of host material W-15 to guest material E-338 is 94:6; the red light host material is selected as W-3, the red light guest material is selected as E-200, and the mass ratio of red light host material W-3 to red light guest material E-200 is 95:5.

[0247] Example 39

[0248] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, with the difference being that the green light host material is selected as W-16, the green light guest material is selected as E-508, and the mass ratio of host material W-16 to guest material E-508 is 94:6; the red light host material is selected as W-3, the red light guest material is selected as E-271, and the mass ratio of red light host material W-3 to red light guest material E-271 is 85:15.

[0249] Example 40

[0250] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, with the difference being that the green light host material is selected as W-17, the green light guest material is selected as E-70, and the mass ratio of host material W-17 to guest material E-70 is 85:15; the red light host material is selected as W-6, the red light guest material is selected as E-326, and the mass ratio of red light host material W-6 to red light guest material E-326 is 95:5.

[0251] Example 41

[0252] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, with the difference being that the green light host material is selected as W-18, the green light guest material is selected as E-201, and the mass ratio of host material W-18 to guest material E-201 is 85:15; the red light host material is selected as W-20, the red light guest material is selected as E-208, and the mass ratio of red light host material W-20 to red light guest material E-208 is 95:5.

[0253] Example 42

[0254] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, with the difference being that the green light host material is H-6, the green light guest material is E-529, and the mass ratio of host material H-6 to guest material E-529 is 94:6; the red light host material is W-11, the red light guest material is E-191, and the mass ratio of red light host material W-11 to red light guest material E-191 is 95:5.

[0255] Example 43

[0256] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, with the difference being that the green light host material is selected as W-12, the green light guest material is selected as E-545, and the mass ratio of host material W-12 to guest material E-545 is 94:6; the red light host material is selected as W-3, the red light guest material is selected as E-208, and the mass ratio of red light host material W-3 to red light guest material E-208 is 95:5.

[0257] Example 44

[0258] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, with the difference being that the green light host material is selected as W-13, the green light guest material is selected as E-529, and the mass ratio of host material W-13 to guest material E-529 is 94:6; the red light host material is selected as W-14, the red light guest material is selected as E-213, and the mass ratio of red light host material W-14 to red light guest material E-213 is 95:5.

[0259] Example 45

[0260] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, with the difference being that the green light host material is selected as W-14, the green light guest material is selected as E-545, and the mass ratio of host material W-14 to guest material E-545 is 94:6; the red light host material is selected as W-6, the red light guest material is selected as E-27, and the mass ratio of red light host material W-6 to red light guest material E-271 is 95:5.

[0261] Example 46

[0262] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, except that the green light host material is selected as W-15, the green light guest material is selected as E-529, and the mass ratio of host material W-15 to guest material E-529 is 90:10; the red light host material is selected as W-16, the red light guest material is selected as E-508, and the mass ratio of red light host material W-16 to red light guest material E-508 is 85:15.

[0263] Example 47

[0264] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, with the difference being that the green light host material is selected as W-15, the green light guest material is selected as E-338, and the mass ratio of host material W-15 to guest material E-338 is 90:10; the red light host material is selected as W-3, the red light guest material is selected as E-200, and the mass ratio of red light host material W-3 to red light guest material E-200 is 95:5.

[0265] Example 48

[0266] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, with the difference being that the green light host material is selected as W-16, the green light guest material is selected as E-338, and the mass ratio of host material W-16 to guest material E-338 is 90:10; the red light host material is selected as W-3, the red light guest material is selected as E-271, and the mass ratio of red light host material W-3 to red light guest material E-271 is 85:15.

[0267] Example 49

[0268] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, with the difference being that the green light host material is selected as W-17, the green light guest material is selected as E-201, and the mass ratio of host material W-17 to guest material E-201 is 85:15; the red light host material is selected as W-6, the red light guest material is selected as E-326, and the mass ratio of red light host material W-6 to red light guest material E-326 is 90:10.

[0269] Example 50

[0270] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, with the difference being that the green light host material is selected as W-18, the green light guest material is selected as E-201, and the mass ratio of host material W-18 to guest material E-201 is 85:15; the red light host material is selected as W-20, the red light guest material is selected as E-208, and the mass ratio of red light host material W-20 to red light guest material E-208 is 95:5.

[0271] Example 51

[0272] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, except that step (5) is not included, i.e. there is no filter on the entire device.

[0273] Example 52

[0274] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, except that there are no 12 isolation columns.

[0275] Example 53

[0276] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, except that the isolation column of 12 is not covered with filler.

[0277] Example 54

[0278] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, except that a filter layer is set in the light extraction functional area layer of the blue light-emitting pixel unit area, while no filter layer is set in the red and green light color conversion functional area layer of the red and green light-emitting pixel unit areas.

[0279] Example 55

[0280] The entire full-color OLED light-emitting device is completed according to the steps of Example 1, except that no filter layer is provided in the light extraction functional area layer of the blue light-emitting pixel unit area, while filter layers are provided on the red and green light color conversion functional areas of the red and green light-emitting pixel unit areas.

[0281] Comparative Example 1

[0282] The device structure of Comparative Example 1 is as follows Figure 1 As shown, the OLED light-emitting device in the comparative embodiment has a traditional three-primary-color base structure. It does not have a green light color conversion layer and a red light color conversion layer, nor does it have a green filter layer and a red filter layer. Instead, the adjacent blue OLED devices are replaced with green OLED devices and red OLED devices, respectively. The green light host materials are D-2 and A-3, and the green light guest material is a phosphorescent iridium complex GPD-1. The red light host material is W-2, and the red light guest material is a phosphorescent iridium complex RPD-1. The mass ratio of the host material D-2, A-3, and the guest material GPD-1 is 47:47:6, and the mass ratio of the red light host material W-2 and the red light guest material RPD-1 is 95:5.

[0283] Comparative Example 2

[0284] The device structure of Comparative Example 2 is as follows Figure 1As shown, the OLED light-emitting device in the comparative embodiment has a traditional three-primary-color base structure. It does not have a green light color conversion layer and a red light color conversion layer, nor does it have a green filter layer and a red filter layer. Instead, adjacent blue OLED devices are replaced with green OLED devices and red OLED devices, respectively. The green light host material is W-3, and the green light guest material is the boron-nitrogen resonance dye NBNP. The red light host material is W-2, and the red light guest material is the boron-nitrogen resonance dye BBCz-R. The mass ratio of the host material W-3 to the guest material NBNP is 85:15, and the mass ratio of the red light host material W-2 to the red light guest material BBCz-R is 95:5.

[0285] Comparative Example 3

[0286] The device structure of Comparative Example 3 is as follows Figure 1 As shown, the OLED light-emitting device in the comparative embodiment has a traditional three-primary-color base structure. It does not have a green light conversion layer and a red light conversion layer, nor does it have a green filter layer and a red filter layer. Instead, adjacent blue OLED devices are replaced with green OLED devices and red OLED devices, respectively. The green host material is W-7, and the green guest material is the boron-nitrogen resonance dye DtCz-DPTRZ. The red host material is W-2, and the red guest material is the boron-nitrogen resonance dye BBCz-R. The mass ratio of the host material W-7 to the guest material DtCz-DPTRZ is 90:10, and the mass ratio of the red host material W-2 to the red guest material BBCz-R is 95:5.

[0287] The filters in this embodiment of the invention are obtained from Chunghwa Picture Tubes Co., Ltd. through contract manufacturing. The red filter has a thickness of 6 micrometers and the green filter has a thickness of 3 micrometers. Their specifications are 2.4-inch QVGA.

[0288] The test results of the pixel features of the full-color OLED light-emitting devices prepared in Examples 1-55 and Comparative Examples 1-3 of this invention are shown in Table 1.

[0289] Table 1:

[0290]

[0291]

[0292]

[0293]

[0294]

[0295]

[0296] 1: White level refers to adjusting the current of different driving pixels of the light-emitting device until a certain standard white light setting is achieved.

[0297] 2: The efficiency and color coordinates of the above tests are based on a device brightness of 500 cd / cm². 2 The driving effect under the current conditions.

[0298] 3: LT97 is the time it takes for the device brightness to decay to 97% of its initial brightness.

[0299] 4: The device cost is based on Comparative Example 1, where the device cost is 100%.

[0300] 5: Cross-talk: When the device brightness is 1 nit, due to leakage current between adjacent pixels, the adjacent pixels of the lit pixel are also lit at the same time, resulting in a deterioration of the device color.

[0301] 6: JNCD (Just Noticeable Color Difference) reflects the degree of color shift. The smaller the value, the smaller the color shift and the more accurate the color display. The formula for calculating JNCD is as follows: ((4*x1 / (-2*x1+12*y1+3)-4*x0 / (-2*x0+12*y0+3))^2+(9*y1 / (-2*x1+12*y1+3)-9*y0 / (-2*x0+12*y0+3))^2)^0.5 / 0.038, where (x0, y0) and (x1, y1) are color coordinate values.

[0302] 7: JNCD calculation for initial white field at a 60-degree viewing angle: (x0, y0) are the color coordinates when the initial white field is driven, and (x1, y1) is the JNCD for the initial white field at a 60-degree viewing angle. JNCD calculation after 1000 hours of white field driving: (x0, y0) are the initial white field color coordinates, and (x1, y1) are the white field color coordinates after the device has been operating for 1000 hours.

[0303] Compared with Comparative Examples 1-3, the green and red light efficiencies of the device of the present invention are not as good as those of traditional RGB three-primary-color devices. The main reasons are, on the one hand, energy conversion loss occurs during the conversion of blue light into green and red light; on the other hand, the host-guest fluorescence luminescence efficiency cannot reach 100% fluorescence quantum efficiency.

[0304] However, a comparison of device lifetimes reveals that OLED devices employing color conversion technology show a more significant improvement in lifetime. This is because the boron-nitrogen heterocyclic fluorescent guest material provided by this invention has a boron-nitrogen-doped polycyclic aromatic hydrocarbon framework structure, exhibiting good structural rigidity. Its stability is superior to traditional phosphorescent materials and also better than general boron-nitrogen multiple resonance thermally activated delayed fluorescence materials.

[0305] Furthermore, it can be observed that for OLED devices using color conversion technology, after adopting the boron-nitrogen heterocyclic fluorescent guest material provided by this invention, due to its excellent narrow-spectrum emission properties, the color coordinate change amplitude after long-term operation is small. This results in stable color and display indicators after long-term operation, effectively solving the serious color shift problem of traditional RGB three primary colors. The device of this invention, through color conversion technology, can effectively solve the problems of high pixel crosstalk, JNCD, and color shift during long-term operation.

[0306] Cross-talk primarily arises from leakage current between adjacent pixels. For example, when a TFT illuminates a blue pixel, leakage current causes adjacent green and red pixels to emit light, leading to a deviation in color purity and resulting in poor screen color. Traditional RGB device structures, due to the independent switching of the TFT, struggle to avoid cross-talk under certain voltage conditions. However, the green and red pixels in this invention's device structure are derived from blue light through a color conversion layer, eliminating leakage current issues and effectively preventing cross-talk, thus significantly improving the device's color purity.

[0307] JNCD is an indicator of color shift, and a smaller value is better. Traditional RGB three-primary-color devices have a large JNCD, leading to severe color shift. Especially as the viewing angle increases, the brightness and color coordinates of the device shift significantly, resulting in severe color shift. The main reason is that traditional RGB devices have a strong microcavity effect, which improves the luminous efficiency at a specific light emission angle, but as the viewing angle increases, the microcavity effect causes significant changes in brightness and color coordinates. In the device of this invention, green and red light are obtained through color conversion, effectively avoiding the color shift problem caused by the microcavity effect. Furthermore, after 1000 hours of operation, the JNCD of the device of this invention changes only slightly, effectively improving the color shift problem caused by long-term operation.

[0308] The large-size full-color OLED light-emitting device manufacturing technology of this invention inherits the traditional large-size full-color OLED light-emitting device manufacturing process, which does not use a metal mask. This is beneficial for manufacturing high-precision light-emitting devices and improving product yield. Furthermore, the light color conversion material is transferred to the blue OLED device via laser transfer. Laser transfer technology can obtain an extremely uniform and smooth transfer film layer, which is suitable for large-size fabrication, further improving the yield of full-color OLED light-emitting devices and increasing the production efficiency of large-size OLED light-emitting devices.

[0309] In summary, the process of this invention for manufacturing large-size full-color OLED light-emitting devices offers comprehensive benefits, including simplified manufacturing processes and improved product yield. It allows for the production of cost-effective large-size full-color OLED light-emitting devices with excellent red, green, and blue primary color balance and efficiency using relatively simple manufacturing techniques.

[0310] The above description is merely the preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Contents not described in detail in this specification are common knowledge to those skilled in the art.

Claims

1. A full-color organic electroluminescent device, characterized in that, The light-emitting area includes multiple light-emitting sub-pixel areas. Each light-emitting sub-pixel area is composed of a red light-emitting pixel unit area, a green light-emitting pixel unit area, and a blue light-emitting pixel unit area. The device is a stacked structure that includes, from bottom to top, a control loop layer, a blue OLED device layer, a first buffer layer, a light extraction layer and a light color conversion function combination layer, a second buffer layer, and an encapsulation layer. The light extraction and light color conversion function combination layer includes: a light extraction function area disposed in the blue light emitting pixel unit area, a red light color conversion function area disposed in the red light emitting pixel unit area, and a green light color conversion function area disposed in the green light emitting pixel unit area; The green light color conversion functional area uses green light color conversion material, the red light color conversion functional area uses red light color conversion material, and both the red light color conversion material and the green light color conversion material are organic light-emitting materials that combine the host material and the guest material. The main material in the red light color conversion material and the green light color conversion material is a single-component material or a two-component material, and the main material is selected from wide bandgap materials, thermally activated delayed fluorescence materials or excitocomplex materials; The guest materials in the red and green light color conversion materials are boron-nitrogen resonance thermally activated delayed fluorescence materials, with the structure shown in formula (1): In equation (1), R 1 ~R 10 Each group is independently selected from hydrogen, deuterium, halogen, hydroxyl, carboxyl, nitro, cyano, sulfone, sulfoxide, alkynyl, or unsubstituted or R'-substituted groups of the following: C1-C30 chain alkyl, C3-C30 cycloalkyl, C1-C10 alkoxy, C1-C10 thioalkyl, C6-C30 acyl, C6-C30 amino, C6-C30 arylamino, C3-C30 heteroarylamino, C6-C60 monocyclic aryl, C6-C60 fused-ring aryl, C6-C60 aryloxy, C6-C60 arylphosphinyl, C5-C60 monocyclic heteroaryl, C5-C60 fused-ring heteroaryl, C6-C30 alkylsilyl, C6-C30 arylsilyl or C6-C30 heteroarylsilyl; The R' is independently selected from one of the following: deuterium, halogen, cyano, C1-C30 chain alkyl, C3-C30 cycloalkyl, C1-C10 alkoxy, C6-C30 arylamino, C3-C30 heteroarylamino, C6-C30 aryl, and C3-C30 heteroaryl.

2. The full-color organic electroluminescent device according to claim 1, characterized in that, In the red and green light color conversion materials, the organic light-emitting materials using a host-guest combination have a single-component host material, and the doping mass ratio of the guest material in the host material is 1% to 30%, preferably 3% to 10%.

3. The full-color organic electroluminescent device according to claim 1, characterized in that, In the red light color conversion material and the green light color conversion material, the organic light-emitting material with host-guest combination has a dual-component main material, and the mass ratio between the dual-component main materials is 1:9 to 9:1, preferably 3:7 to 7:3; The doping mass ratio of the guest material in the host material is 1% to 30%, preferably 3% to 10%.

4. The full-color organic electroluminescent device according to claim 1, characterized in that, One of the red light color conversion materials and the green light color conversion materials uses a two-component host material, and the mass ratio between the two-component host materials is 1:9 to 9:1, preferably 3:7 to 7:3; the doping mass ratio of the guest material in the host material is 1% to 30%, preferably 3% to 10%. Another type of red light color conversion material and green light color conversion material uses a single-component host material, and the doping mass ratio of the guest material in the host material is 1% to 30%, preferably 3% to 10%.

5. The full-color organic electroluminescent device according to any one of claims 1-4, characterized in that, The red light color conversion material and the green light color conversion material may use the same or different main materials.

6. The full-color organic electroluminescent device according to any one of claims 1-4, characterized in that, The main material in the red light color conversion material and the green light color conversion material is a wide-bandgap main material, which is selected from at least one compound among carbazole derivatives, carbline derivatives, spirofluorene derivatives, fluorene derivatives, silicon-based derivatives, phosphoxy-based derivatives, and sulfone-based derivatives. Alternatively, the main material in the red light color conversion material and the green light color conversion material is a thermally activated delayed fluorescence material, which is selected from at least one compound among benzonitrile derivatives, carbazole derivatives, spirofluorene derivatives, thiazole derivatives, and triazine derivatives. Alternatively, the main material in the red light color conversion material and the green light color conversion material is an excimer compound material. The excimer compound material includes a donor material and an acceptor material. The donor material in the excimer compound material is selected from at least one compound selected from indolecarbazole derivatives, carbazole derivatives, furan derivatives, thiophene derivatives, spirofluorene derivatives, fluorene derivatives, silicon-containing derivatives, and diphenylamine derivatives. The acceptor material in the excimer compound material is selected from at least one compound selected from triazine derivatives, pyridone derivatives, imidazole derivatives, o-phenanthroline derivatives, thiophene derivatives, thionone derivatives, spirofluorene derivatives, fluorene derivatives, silicon-containing derivatives, cyano derivatives, phosphoxy derivatives, and sulfone derivatives.

7. The full-color organic electroluminescent device according to claim 6, characterized in that, The wide-bandgap host material used as the host material in the red light color conversion material and the green light color conversion material is selected from any of the compounds shown in the following structures:

8. The full-color organic electroluminescent device according to claim 6, characterized in that, The thermally activated delayed fluorescence used as the host material in the red and green light color conversion materials is selected from compounds with any of the following structures:

9. The full-color organic electroluminescent device according to claim 6, characterized in that, The donor material in the excimer complex used as the host material in the red light color conversion material and the green light color conversion material is selected from any of the compounds shown in the following structures: The acceptor material in the excimer complex used as the host material in the red light color conversion material and the green light color conversion material is selected from compounds with any of the following structures:

10. The full-color organic electroluminescent device according to claim 1, wherein in formula (1), R 1 ~R 10 Each group is independently selected from hydrogen, deuterium, or one or more combinations of the following groups: methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, 2-methylbutyl, n-pentyl, sec-pentyl, cyclopentyl, neopentyl, n-hexyl, cyclohexyl, neohexyl, n-heptyl, cycloheptyl, n-octyl, cyclooctyl, 2-ethylhexyl, trifluoromethyl, pentafluoroethyl, 2,2,2-trifluoroethyl, ethynyl, trimethylsilylethynyl, tert-butylethynyl, triisopropylsilylethynyl, phenyl, tert-butylphenyl, naphthyl, anthracene, benzo[a]anthrayl, phenanthryl, benzo[a]phenanthryl, pyrene, peryl, uryl, fluoranyl, azulene, tetraphenyl, pentaphenyl, benzo[a]pyrene, biphenyl, azabiphenyl, azobiphenyl, terphenyl, Phenylacetyl, naphthylphenyl, phenyl terphenyl, tetraphenyl, fluorenyl, spirodifluorenyl, benzo[a]fluorenyl, dibenzo[a]fluorenyl, dihydrophenanthrene, dihydropyrene, tetrahydropyrene, cis or trans indo[a]fluorenyl, indene, trimerinyl, isotrimerininyl, spirotrimerininyl, spiroisotrimerininyl, triphenylene, furanyl, benzo[a]furanyl, isobenzo[a]furanyl, dibenzo[a]furanyl, thiazolyl Fenyl, benzothiophene, isobenzothiophene, dibenzothiophene, pyrrole, indole, isoindole, benzoindole, carbazole, benzocarbazole, indocarbazole, dibenzocarbazole, pyridyl, bipyridyl, quinolinyl, isoquinolinyl, cenolinyl, quinazolinyl, benzoquinazolinyl, benzodioxanepentenyl, acridine, dihydroacridyl, phenanthridine, benzene benzo-5,6-quinolinyl, benzo-6,7-quinolinyl, benzo-7,8-quinolinyl, pyrazolyl, indazoleyl, imidazoleyl, benzimidazoleyl, naphthomidazoleyl, phenanthrenemidazoleyl, pyridiniumimazoleyl, pyraziniumimazoleyl, quinoxaloylimazoleyl, oxazolyl, isoxazolyl, benzoxazolyl, benzoisoxazolyl, naphthomidazoleyl, anthraquinoxazolyl, phenanthrenemidazoleyl 1,2-Thiazolyl, 1,3-Thiazolyl, benzothiazolyl, benzoisothiazolyl, pyridinyl, benzopyridinyl, pyrimidinyl, benzopyrimidinyl, quinoxalinyl, benzoquinoxalinyl, 5,10-diazathanel, 2,7-diazapyrene, 2,3-diazapyrene, 1,6-diazapyrene, 1,8-diazapyrene, 4,5-diazapyrene, 4 5,9,10-Tetraazaperyl, Pyrazinyl, Phenazinyl, Phenoxazinyl, Phenthiazinyl, Naphridinyl, Azacarbazolyl, Benzocarbazolyl, Phenanthrolinel, 1,2,3-Triazolyl, 1,2,4-Triazolyl, Benzotriazolyl, 1,2,3-Oxadiazolyl, 1,2,4-Oxadiazolyl, 1,2,5-Oxadiazolyl, 1,2,3-Thiadiazolyl 1,2,4-Thiadiazolyl, 1,2,5-Thiadiazolyl, 1,3,4-Thiadiazolyl, 1,3,5-Triazinyl, 1,2,4-Triazinyl, 1,2,3-Triazinyl, Tetrazolyl, 1,2,4,5-Tetrazinyl, 1,2,3,4-Tetrazinyl, 1,2,3,5-Tetrazinyl, Purinyl, Pteridyl, Indazinyl, Benzothiadiazolyl, 9,9-Dimethylacridyl, triarylamine, adamantyl, fluorophenyl, methylphenyl, trimethylphenyl, cyanophenyl, tetrahydropyrrolyl, piperidinyl, methoxy, trisenel, cyclosenel, tetrastyrene, naphthimide, triphenylboryl, cycloheptanetrienyl, trimethylsilyl, triethylsilyl, triisopropylsilyl, triphenylsilyl, dimethylphenylsilyl, diphenylmethylsilyl, or tert-butyldiphenylsilyl.

11. The full-color organic electroluminescent device according to claim 1, wherein the boron-nitrogen resonance thermally activated delayed fluorescence material used as the guest material in the red light color conversion material and the green light color conversion material has the structure shown in formula (2): Wherein group R 9 and R 10 The scope of the definition is the same as that in equation (2); Preferably, the R 9 R 10 Each group is independently selected from one of the following groups: in Indicates the linking site of a functional group.

12. The full-color organic electroluminescent device according to claim 1, wherein the boron-nitrogen resonance thermally activated delayed fluorescence material used as the guest material in the red light color conversion material and the green light color conversion material is selected from the following specific structural compounds:

13. The full-color organic electroluminescent device according to claim 1, characterized in that, The blue OLED device layer includes a first electrode, at least one organic light-emitting functional material film combination layer, and a second electrode. The first electrode is a reflective electrode layer, and the second electrode is a transparent conductive electrode layer. The structural type of the blue OLED device layer is selected from any of the following: (1) First electrode / blue organic light-emitting functional material film combination layer / second electrode; (2) First electrode / blue organic light-emitting functional material film combination layer / charge generation layer / blue organic light-emitting functional material film combination layer / second electrode; (3) First electrode / blue organic light-emitting functional material film combination layer / charge generation layer / blue organic light-emitting functional material film combination layer / charge generation layer / blue organic light-emitting functional material film combination layer / second electrode; The blue organic light-emitting functional material film composite layer includes one or more of the following: hole injection layer, hole transport layer, electron blocking layer, light-emitting layer, hole blocking layer, electron transport layer, and electron injection layer, and must include a light-emitting layer.

14. The full-color organic electroluminescent device according to claim 1 or 13, characterized in that, The emission spectrum of the blue OLED device layer is located in the range of 440–470 nm, and the full width at half maximum (FWHM) is ≤60 nm.

15. The full-color organic electroluminescent device according to claim 1, characterized in that, An isolation pillar is provided between multiple light-emitting sub-pixel areas in the light-emitting region, or no isolation pillar is provided between multiple light-emitting sub-pixel areas in the light-emitting region.

16. The full-color organic electroluminescent device according to claim 1, characterized in that, The light extraction functional area layer material disposed in the blue light-emitting pixel unit area is an inorganic or organic material with a refractive index ≥1.8 and an extinction coefficient ≤0.1 at a wavelength ≥450nm.

17. The full-color organic electroluminescent device according to claim 1, characterized in that, The materials of the first buffer layer and the second buffer layer are independently selected from organic or inorganic materials with a refractive index ≤1.4 and an extinction coefficient ≤0.1 at a wavelength ≥450nm.

18. The full-color organic electroluminescent device according to claim 1, characterized in that, A separating area is provided between the green light color conversion functional area and the red light color conversion functional area. A third buffer layer is filled in the separating area. The refractive index of the third buffer layer material is ≤1.

4. The material of the third buffer layer may be the same as or different from that of the first buffer layer.

19. The full-color organic electroluminescent device according to claim 1, characterized in that, The light extraction and light color conversion function combination layer may or may not have a filter layer.

20. The full-color organic electroluminescent device according to claim 1, characterized in that, The green light conversion material and red light conversion material in the light and color conversion functional combination layer are prepared by vacuum evaporation technology, laser transfer technology, inkjet printing technology, screen printing technology or spin coating technology.

Images