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Organic electroluminescent device and preparation method

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

Inactive Publication Date: 2014-08-27
OCEANS KING LIGHTING SCI&TECH CO LTD +2
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  • Summary
  • 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
  • Organic electroluminescent device and preparation method
  • Organic electroluminescent device and preparation method

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preparation example Construction

[0037] Please also see figure 2 , the preparation method of the organic electroluminescent device 100 of an embodiment, it comprises the following steps:

[0038] Step S110 , preparing the scattering layer 10 on the front surface of the glass substrate 20 by electron beam evaporation.

[0039] The scattering layer 10 includes a hafnium compound and a metal oxide doped into the hafnium compound, wherein the metal oxide accounts for 10% to 50% by mass of the hafnium compound, and the hafnium compound The material is selected from at least one of hafnium dioxide and hafnium diboride, and the metal oxide is selected from at least one of tantalum pentoxide, niobium pentoxide and vanadium pentoxide.

[0040] The thickness of the scattering layer 10 is 50 nm to 500 nm.

[0041] Electron beam evaporation at a vacuum pressure of 5 x 10 -5 Pa~2×10-3 Under Pa, the energy density is 10W / cm 2 ~l00W / cm 2 .

[0042] The glass substrate 20 is glass with a refractive index of 1.8-2.2, a...

Embodiment 1

[0059] The structure prepared in this embodiment is Ta 2 o 5 :HfO 2 / Glass Substrate / ITO / MoO 3 / TAPC / BCzVBi / TPBi / LiF / Al organic electroluminescent devices.

[0060] The glass substrate is N-LASF44. After rinsing the glass substrate with distilled water and ethanol, soak it in isopropanol for one night. The scattering layer was prepared on the front of the glass substrate by electron beam evaporation, and the material of the scattering layer was Ta 2 o 5 and HfO 2 , among them, Ta 2 o 5 accounted for HfO 2 The mass percentage is 15%, and the condition of electron beam evaporation is that the vacuum pressure is 8×10 -4 Pa, the energy density is 25W / cm 2 , the anode was prepared on the reverse side of the glass substrate by magnetron sputtering, the anode material was ITO, and the condition of magnetron sputtering was that the vacuum pressure was 8×10 -4 Pa, the accelerating voltage is 400V, the magnetic field is 100G, and the power density is 200W / cm 2 , and then seq...

Embodiment 2

[0065] The structure prepared in this example is Nb 2 o 5 :HfB 2 / Glass Substrate / AZO / V 2 o 5 / TCTA / ADN / Bphen / CsF / Pt organic electroluminescent devices.

[0066] The glass substrate is N-LAF36. After rinsing the glass substrate with distilled water and ethanol, soak it in isopropanol for one night; use electron beam evaporation to prepare a scattering layer on the front of the glass substrate. The material of the scattering layer is Nb 2 o 5 and HfB 2 , where Nb 2 o 5 accounted for HfB 2 The mass percentage is 50%, and the condition of electron beam evaporation is that the vacuum pressure is 2×10 -3 Pa, the energy density is 100W / cm 2 , the anode was prepared on the reverse side of the glass substrate by magnetron sputtering, the anode material was AZO, and the condition of magnetron sputtering was that the vacuum pressure was 2×10 -3 Pa, the accelerating voltage is 300V, the magnetic field is 200G, and the power density is 40W / cm 2 , and then sequentially vapor-de...

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Abstract

An organic electroluminescent device comprises a scattering layer, a glass substrate, an anode, a hole injection layer, a hole transport layer, a luminescent layer, an electron transport layer, an electron injection layer and a cathode which are successively laminated. The scattering layer contains a hafnium compound and metal oxides doped in the hafnium compound, wherein mass of the metal oxides accounts for 10wt%-50wt% of mass of the hafnium compound; the material of the hafnium compound is selected from at least one of hafnium oxide and hafnium diboride; and the metal oxides are selected from at least one of tantalum pentoxide, niobium pentoxide and vanadium pentoxide. Luminous efficiency of the above organic electroluminescent device is high. The invention also provides a preparation method of the 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): H01L51/50H01L51/52H01L51/56
CPCH10K85/6572H10K50/854H10K2102/00H10K71/00
Inventor 周明杰王平黄辉陈吉星
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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