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Organic LED (light-emitting diode)

A light-emitting diode and organic technology, which is applied in the manufacture of electrical components, electrical solid devices, semiconductor/solid devices, etc., can solve the problem that the spectral stability has not been fundamentally solved, the complexity of device preparation, spectral instability, etc. problem, to achieve the effect of high color rendering index, simplified structure, and stable luminescent spectrum

Active Publication Date: 2015-05-20
CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Fluorescent / phosphorescent hybrid white organic light-emitting diodes usually adopt a red (phosphorescent), green (phosphorescent) and blue (fluorescent) three-emitting layer structure or a red-green (phosphorescent) and blue (fluorescent) two-emitting layer structure to achieve high color rendering index In order to avoid the exciton quenching problem caused by Dexter energy transfer between the phosphorescent layer and the fluorescent layer, another organic layer with a high triplet energy level is often introduced between the phosphorescent layer and the fluorescent layer to separate They, this design itself has very high requirements on the selection of materials, and the multi-emitting layer or multi-source doping also brings the complexity of device preparation, and its spectral stability has not been fundamentally solved.
In the prior art, there are many fluorescent / phosphorescent hybrid white light organic light emitting diodes, such as a white light organic light emitting diode proposed by Y.Sun et al. The device structure is relatively complicated, and two dye-doped blue fluorescent light emitting layers are introduced and two spacer layers, the spectrum also shows some instability

Method used

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  • Organic LED (light-emitting diode)
  • Organic LED (light-emitting diode)
  • Organic LED (light-emitting diode)

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preparation example Construction

[0059] The present invention has no special limitation on the preparation method of the organic light-emitting diode, and the present invention preferably adopts the following method for preparation, specifically:

[0060] First, the ITO anode layer 2 on the ITO glass is photoetched into thin strip electrodes, then cleaned, dried with nitrogen, treated with oxygen plasma for 1~5min, and baked in a vacuum oven at 120°C for 0.5~1h, and then transferred to In the vacuum coating system, wait for the vacuum degree to reach 1~5×10 -4 At Pa, the hole interface layer 3, the hole transport layer 4, the light-emitting layer 5, the electron transport layer 6, the electron interface layer 7 and the cathode 8 are sequentially evaporated on the ITO anode layer 2, wherein the two electrodes intersect each other to form a device The light-emitting area, the area of ​​the light-emitting area is 16mm 2 , the thickness of the hole interface layer 3 is 2~20nm, the thickness of the hole transport...

Embodiment 1

[0064] First, the ITO anode 2 on the glass substrate 1 is photolithographically formed into an electrode of 4 mm × 30, then cleaned, blown dry with nitrogen, placed the glass in a vacuum oven and baked at 120°C for 30 minutes, treated with oxygen plasma for 2 minutes, and then Put the glass into the vacuum coating system. When the vacuum degree of the vacuum coating system reaches 1~5×10 -4 Pa, sequentially vapor-deposit MoO on the ITO anode 2 3 Hole interface layer 3, TAPC hole transport layer 4, red phosphorescent dye (PPQ) 2 Ir (acac) and green phosphorescent dye (ppy) 2 Ir(acac)-doped electron transport material Be(PP) 2 luminescent layer 5, Be(PP) 2 The electron transport layer 6 of LiF, the electron interface layer 7 of LiF and the cathode 8 of metal Al, wherein the two electrodes intersect with each other form the light emitting area of ​​the device, and the area of ​​the light emitting area is 16mm 2 , the thicknesses of hole interface layer 3, hole transport laye...

Embodiment 2

[0067] First, the ITO anode 2 on the glass substrate 1 is photolithographically formed into an electrode of 4mm×30mm, then cleaned, blown dry with nitrogen gas, placed the glass in a vacuum oven and baked at 120°C for 30min, treated with oxygen plasma for 2min, and then put The glass is placed in a vacuum coating system. When the vacuum degree of the vacuum coating system reaches 1 to 5×10 -4 Pa, sequentially vapor-deposit MoO on the ITO anode 2 3 Hole interface layer 3, TAPC hole transport layer 4, red phosphorescent dye (PPQ) 2 Ir(acac) and green phosphorescent dye Ir(ppy) 3 Emitting layer of doped electron transport material Be(PP)2 5, Be(PP) 2 The electron transport layer 6 of LiF, the electron interface layer 7 of LiF and the cathode 8 of metal Al, wherein two electrodes intersect with each other to form the light-emitting area of ​​the device, the area of ​​the light-emitting area is 16 square millimeters, the hole interface layer 3, the hole transport layer 4. The t...

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Abstract

The invention provides an organic LED (light-emitting diode), comprising a substrate, a first electrode arranged on the substrate, a second electrode arranged on the first electrode, and an organic light-emitting unit arranged between the first electrode and the second electrode, wherein the organic light-emitting unit comprises a light-emitting layer which is formed of an electron transport material capable of emitting blue light and phosphorescent dyes doped in the electron transport material; the phosphorescent dyes include a red-light phosphorescent dye and a green-light phosphorescent dye; and the concentration of the red-light phosphorescent dye in the electron transport material is 0.2-0.5wt%, while the concentration of the green-light phosphorescent dye in the electron transport material is 0.02-0.05wt%. A white organic light-emitting diode with a single light-emitting layer structure is designed by the invention; white light emission with red light and green light from phosphorescent objects and blue light from a fluorescent subject is realized; the device is not only simple in structure, but also high in efficiency, high in color-rendering index and high in spectrum stability.

Description

technical field [0001] The invention relates to the field of electronic devices, in particular to an organic light emitting diode. Background technique [0002] Organic light-emitting diodes have many advantages such as full solid state, active light emission, high contrast, fast response, wide viewing angle, vivid color, high definition, ultra-thin and easy flexible display, and are emerging display technologies in the information field. After LCD It is expected to become the fastest-growing new flat-panel display technology in the next 20 years, and has been widely used in small and medium-sized color displays such as mobile phones, personal data processors, and car dashboards. [0003] Organic light-emitting diodes can achieve different light-emitting colors such as red, green, blue, or white light according to different light-emitting layers, especially the research on white light-emitting organic light-emitting diodes with a wide spectrum has attracted more and more att...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/54H01L51/50
Inventor 马东阁张智强陈江山陈永华代岩峰刘一鹏
Owner CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES