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Organic electroluminescent device and preparation method

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

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

[0033] Please also see figure 2 , the preparation method of the organic electroluminescent device 100 of an embodiment, it comprises the following steps:

[0034] Step S110 , preparing the anode 30 on the back of the glass substrate 20 by vapor deposition.

[0035] 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.

[0036] The anode 30 is composed of a first lanthanide oxide layer, a metal layer and a second lanthanide oxide layer stacked in sequence, wherein the first lanthanide oxide and the second lanthanide oxide are selected from praseodymium dioxide, three At least one of praseodymium oxide, ytterbium trioxide and samarium oxide, the metal layer includes a first metal layer and a second metal layer doped in the first metal layer, wherein the first metal layer is selected from At least one of silver...

Embodiment 1

[0050] The structure prepared in this example is / glass substrate / PrO 2 :Mg:Ag:PrO 2 / / TCTA / Alq 3 / TPBi / CsF / Ag organic electroluminescent devices.

[0051] The glass substrate is N-LASF44. After rinsing the glass substrate with distilled water and ethanol, soak it in isopropanol for one night. The anode is prepared on the surface of the glass substrate by evaporation, and a layer of PrO is first evaporated. 2 , with a thickness of 1nm, and then vapor-deposit a metal layer, which is a doped metal layer of Mg and Ag, wherein Mg accounts for 5% by mass of Ag, and the thickness of the metal layer is 10nm, and then vapor-deposits on the surface of the metal layer One layer of PrO 2 , with a thickness of 2nm, and then sequentially evaporated on the surface of the stacked anode to prepare a hole transport layer: the selected material is TCTA, the thickness of the hole transport layer is 45nm, and evaporated to prepare a light-emitting layer: the selected material is Alq 3 , with...

Embodiment 2

[0056] The structure prepared in this example is / glass substrate / Pr 2 o 3 Ca:Al:Yb 2 o 3 / TAPC / ADN / Bphen / LiF / Pt organic electroluminescent devices.

[0057] The glass substrate is N-LAF36. After rinsing the glass substrate with distilled water and ethanol, soak it in isopropanol for one night; prepare an anode on the surface of the glass substrate by evaporation, and first evaporate a layer of Pr 2 o 3 , with a thickness of 2nm, and then vapor-deposit a metal layer, the metal layer is a doped metal layer of Ca and Al, wherein Ca accounts for 1% by mass of Al, and the thickness of the metal layer is 20nm, and then vapor-deposits on the surface of the metal layer Layer Yb 2 o 3 , with a thickness of 2nm, and then sequentially vapor-deposited on the surface of the stacked anode to prepare a hole transport layer: the selected material is TAPC, the thickness of the hole transport layer is 40nm, and the light-emitting layer is prepared by evaporation: the selected material is...

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Abstract

An organic electroluminescent device comprises a glass substrate, an anode, a hole transport layer, a luminescent layer, an electron transport layer, an electron injection layer and a cathode which are successively laminated. The anode is composed of a first lanthanide oxide layer, a metal layer and a second lanthanide oxide layer which are successively laminated, wherein a first lanthanide oxide and a second lanthanide oxide are selected from at least one of praseodymium dioxide, praseodymium oxide, ytterbium trioxide and samarium oxide. The metal layer contains a first metal layer and a second metal layer doped in the first metal layer, wherein the first metal layer is selected from at least one of silver, aluminium, platinum and gold; the second metal layer is metal with work function being minus 4.0eV- minus 2.0eV; and mass of the second metal layer accounts for 1 wt%-10wt% of mass of the first metal layer. 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
CPCH10K50/81
Inventor 周明杰王平黄辉张振华
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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