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Organic electroluminescent device and preparation method thereof

An electroluminescent device and luminescent technology, which is applied in the fields of electric solid-state devices, semiconductor/solid-state device manufacturing, electrical components, etc., can solve the problems of total reflection loss, poor refractive index, and low light extraction performance

Inactive Publication Date: 2014-08-27
OCEANS KING LIGHTING SCI&TECH CO LTD +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In traditional light-emitting devices, only about 18% of the light inside the device can be emitted to the outside, while the rest will be consumed outside the device in other forms, and there is a difference in refractive index between the interfaces (such as between glass and ITO). The difference between the refractive index, the refractive index of glass is 1.5, ITO is 1.8, the light from ITO reaches the glass, and total reflection will occur), which causes the loss of total reflection, resulting in lower overall light extraction performance

Method used

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  • Organic electroluminescent device and preparation method thereof
  • Organic electroluminescent device and preparation method thereof
  • Organic electroluminescent device and preparation method thereof

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preparation example Construction

[0038] Please also see figure 2 , the preparation method of the organic electroluminescent device 100 of an embodiment, it comprises the following steps:

[0039] Step S110, immerse the back of the glass substrate 20 in a titanium tetrachloride solution at 50°C-100°C for 20-60 minutes, after washing, calcinate at 400-600°C to form a titanium dioxide film on the back of the glass substrate.

[0040] The glass substrate 20 is glass with a refractive index of 1.8-2.2, and the transmittance at 400 nm is higher than 90%. The glass substrate 20 is preferably glass with a grade of N-LAF36, N-LASF31A, N-LASF41A or N-LASF44. It should be noted that there is no substantial difference between the front and the back of the glass substrate 20 before being processed. In the present invention, in order to distinguish the two opposite surfaces of the glass substrate 20, the two surfaces are respectively referred to as the front and the back.

[0041] In this embodiment, the glass substrate...

Embodiment 1

[0066] The structure prepared in this example is CaCO 3 / TiO 2 / Glass Substrate / PEDOT:PSS / Ag / MoO 3 / NPB / Alq 3 / TAZ / Cs 2 CO 3 / Al organic electroluminescent devices.

[0067] The glass substrate is N-LASF44. After rinsing the glass substrate with distilled water and ethanol, soak it in isopropanol for one night. The glass substrate is first made of TiCl 4 Treatment: After rinsing the glass substrate with distilled water and ethanol, soak it in isopropanol for one night, and prepare TiCl with a concentration of 40mmol / L 4 In the aqueous solution, stir well, then tape the front of the glass substrate first, and then put the TiCl 4In the solution, keep warm at 70°C for 30min, take it out, rinse it with distilled water and absolute ethanol in turn, tear off the tape, and then calcinate at 500°C for 30min. Then a layer of titanium dioxide film was formed on the side not stuck to the tape, with a thickness of 2 μm. Then continue to stick to the side without titanium dioxide,...

Embodiment 2

[0072] The structure prepared in this example is CaCO 3 / TiO 2 / Glass Substrate / PEDOT:PSS / Al / V 2 o 5 / TCTA / ADN / Bphen / LiF / Pt organic electroluminescent devices.

[0073] The glass substrate is N-LAF36, rinse the glass with distilled water and ethanol, and soak it in isopropanol for one night. The glass substrate is first made of TiCl 4 Treatment: After rinsing the glass with distilled water and ethanol, soak it in isopropanol for one night, and prepare TiCl with a concentration of 20mmol / L 4 In the aqueous solution, stir well, then tape the front of the glass substrate first, and then put the TiCl 4 In the solution, keep warm at 50°C for 60min, take it out, rinse it with distilled water and absolute ethanol in turn, tear off the tape, and then calcinate at 600°C for 20min. Then a layer of titanium dioxide film was formed on the side not stuck to the tape with a thickness of 1 μm. Then continue to stick to the side without titanium dioxide, carry out calcium acetate treat...

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Abstract

Disclosed is an organic electroluminescent device. The organic electroluminescent device comprises an outer scattering layer, a glass substrate, a polymer layer, an anode, a cavity injecting layer, a cavity transmission layer, a luminescent layer, an electron transmission layer, an electron injecting layer and a cathode which are successively stacked. The material of the outer scattering layer comprises a titanium dioxide film formed at the back surface of the glass substrate and a calcium carbonate film formed on the surface of the titanium dioxide film. The material of the polymer layer is a mixture of poly (3,4-ethylenedioxythiophene) and polybenzenesulfonate. The material of the anode is selected from at least one from silver, aluminum, platinum and gold. The organic electroluminescent device is quite high in light emission efficiency. The invention also provides a preparation method of an organic electroluminescent device.

Description

technical field [0001] The invention relates to an organic electroluminescence device and a preparation method thereof. Background technique [0002] The luminescence principle of organic electroluminescent devices is based on the action of an external electric field, electrons are injected from the cathode to the lowest unoccupied molecular orbital (LUMO) of organic matter, and holes are injected from the anode to the highest occupied molecular orbital (HOMO) of organic matter. Electrons and holes meet, recombine, and form excitons in the light-emitting layer. Excitons migrate under the action of an electric field, transfer energy to the light-emitting material, and excite electrons to transition from the ground state to the excited state. The excited state energy is deactivated by radiation to generate photons , releasing light energy. [0003] In traditional light-emitting devices, only about 18% of the light inside the device can be emitted to the outside, while the res...

Claims

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Application Information

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IPC IPC(8): H01L51/52H01L51/54H01L51/56
CPCH10K71/166H10K85/1135H10K85/626H10K85/324H10K50/81H10K50/854H10K71/00
Inventor 周明杰王平黄辉张振华
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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