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OELD (Organic Electroluminescent Device) and preparation method thereof

An electroluminescent device, an organic technology, applied in the direction of electric solid-state devices, semiconductor/solid-state device manufacturing, electrical components, etc., can solve the problems of high price and low device efficiency

Active Publication Date: 2012-10-03
KUNSHAN VISIONOX DISPLAY TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The organic electroluminescent device obtained by this method has high efficiency, but the synthesis of materials requires precious metals such as iridium and platinum, which are expensive
Another method is to use the intersystem crossing properties of lanthanide compounds, that is, to use intramolecular energy transfer to transfer the triplet energy of the host material of the light-emitting layer to the 4f energy level of the lanthanide metal ion, and then emit light, etc., but the current obtained low device efficiency

Method used

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  • OELD (Organic Electroluminescent Device) and preparation method thereof
  • OELD (Organic Electroluminescent Device) and preparation method thereof
  • OELD (Organic Electroluminescent Device) and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] In this example, yellow light-emitting devices with different doping concentrations of fluorescent dyes were prepared, and these devices have such as image 3 structure shown. The light-emitting layer contains a host material (Host 1) and a fluorescent dopant dye (YD 1), wherein the energy level difference between the triplet state and the singlet state of the Host 1 material is 0.1eV, and the singlet state energy level of YD1 is 2.2eV, which is lower than The singlet energy level of Host 1. The structural formulas of Host1 and YD 1 are as follows:

[0059]

[0060] The device structure of this embodiment is as follows:

[0061] ITO (150nm) / NPB (40nm) / Host 1: (0.01%, 0.5%, 1.0%, 5%) YD 1 (30nm) / Alq 3 (20nm) / LiF(0.5nm) / Al(150nm)

[0062] Wherein, the percentages in parentheses before YD1 indicate different doping concentrations of fluorescent dyes, and in this embodiment and the following, the doping concentrations are all weight %.

[0063] The specific preparat...

Embodiment 2

[0081] In this example, yellow light-emitting devices with different doping concentrations of fluorescent dyes were prepared, and these devices have such as image 3 structure shown. The light-emitting layer contains a host material (Host 2) and a fluorescent doped dye (YD 1), where the energy level difference between the triplet state and the singlet state of the Host2 material is 0.1eV, and the singlet state energy level of YD1 is lower than that of Host 2. state energy level. The structural formula of Host 2 is as follows:

[0082]

[0083] The device structure of this embodiment is as follows:

[0084] ITO (150nm) / NPB (40nm) / Host 2: (0.01%, 0.5%, 1.0%, 5%, 10%) YD 1 (30nm) / Alq3 (20nm) / LiF (0.5nm) / Al (150nm)

[0085] Wherein, the percentages in parentheses before YD1 indicate different doping concentrations of fluorescent dyes, and in this embodiment and the following, the doping concentrations are all weight %.

[0086] The specific preparation method of the organic...

Embodiment 3

[0097] In this example, red light-emitting devices with different doping concentrations of fluorescent dyes were prepared, and these devices had such image 3 structure shown. The light-emitting layer contains a host material (Host3) and a fluorescent dopant dye (RD 1). The energy level difference between the triplet state and the singlet state of Host3 is 0.11eV, the energy level of the singlet state of RD1 is 2.0eV, and the energy level of the singlet state of RD1 is lower than that of Host 3. The structural formulas of Host3 and RD1 are as follows:

[0098]

[0099] Prepare an organic electroluminescence device in the same manner as in Example 1 above, and the structure of the light-emitting device is as follows:

[0100] ITO (150nm) / NPB (40nm) / Host 3: (0.01%, 0.5%, 1.0%, 5%, 10%) RD 1 (30nm) / Bphen (20nm) / LiF (0.5nm) / Al (150nm)

[0101] Among them, the percentages in parentheses before RD1 indicate different fluorescent dye doping concentrations.

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Abstract

The invention provides a novel OELD (Organic Electroluminescent Device). The novel OELD comprises an anode, a hole transmission layer, a luminous layer, an electronic transmission layer and a cathode which are mutually laminated, wherein the energy level difference between triplet state and singlet state of a main body material of the luminous layer is less than 0.15 eV. The invention also provides a preparation method of the OELD. The OELD provided by the invention has increased luminous efficiency by using the main body material.

Description

technical field [0001] The invention relates to an organic electroluminescent device and a preparation method of the device. Background technique [0002] In the electroluminescent process of organic electroluminescent devices, mainly rely on the electronic transition of the host material of the light-emitting layer from the excited state to the ground state to generate light. At room temperature, the luminescence produced by the electronic transition from the triplet excited state back to the ground state is extremely weak, and most of its energy is lost in the form of heat. The luminescence is mainly produced by the electronic transition from the singlet excited state to the ground state, called electric current Fluoresces. Since triplet excited states are generated three times more frequently than singlet excited states, the equivalent of 75% of the energy is not used for light emission. Making full use of this energy will effectively improve the luminous efficiency of ...

Claims

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Application Information

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IPC IPC(8): H01L51/54H01L51/50H01L51/56
Inventor 邱勇张国辉李建仁任雪艳
Owner KUNSHAN VISIONOX DISPLAY TECH
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