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Solution-processed organic-inorganic planar heterojunction light emitting diode and manufacturing method thereof

A technology of light-emitting diodes and solution processing, which is applied to the materials of organic semiconductor devices, semiconductor/solid-state device manufacturing, nanotechnology for materials and surface science, etc., which can solve the imbalance of electron and hole transport and the difficulty of achieving monochromatic Solve the problems of light source and luminescence peak shape, etc., achieve the effect of sharp luminescence peak, overcome high material cost, and narrow half-peak width

Inactive Publication Date: 2015-12-23
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the characteristics of the material itself, organic LEDs are expensive, have low mobility, and the transport of electrons and holes is unbalanced. Moreover, the electroluminescent peaks of organic LEDs are complex and have a large half-peak width, making it difficult to achieve pure Monochromatic light source, making it difficult to apply to laser

Method used

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  • Solution-processed organic-inorganic planar heterojunction light emitting diode and manufacturing method thereof
  • Solution-processed organic-inorganic planar heterojunction light emitting diode and manufacturing method thereof
  • Solution-processed organic-inorganic planar heterojunction light emitting diode and manufacturing method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Preparation of light-emitting layer materials:

[0045] Dissolve compound A, compound B and polymer additives in an organic solvent and stir until the reaction is complete; the compound A is an organic or inorganic salt containing a halogen; the compound B is a metal inorganic salt containing a halogen; the compound A The molar ratio to compound B is 1:1-10:1; the added amount of the polymer additive is 0.5%-15% of the mass sum of compound A and compound B.

[0046] Compound A (CH 3 NH 3 I,CH 3 NH 3 Br,CH 3 NH 3 Cl,CH 3 CH 2 NH 3 I,CH 3 CH 2 NH 3 Br,CH 3 CH 2 NH 3 Cl,CH 3 CH 2 CH 2 NH 3 I,CH 3 CH 2 CH 2 NH 3 Br,CH 3 CH 2 CH 2 NH 3 Cl, CsI, CsBr, CsCl, CH(NH 2 ) 2 I,CH(NH 2 ) 2 Br,CH(NH 2 ) 2 Cl,CH 3 CH(NH 2 ) 2 I,CH 3 CH(NH 2 ) 2 Br,CH 3 CH(NH 2 ) 2 Cl) was synthesized according to the method in the literature (J.Am.Chem.Soc.2012,134,17396-17399).

[0047] Compound B is at least one of the following compounds: PbI 2 ,PbBr 2 ,P...

Embodiment 2

[0057] Fabrication of organic-inorganic heterojunction light-emitting diodes:

[0058]Pre-cut the ITO conductive glass with a square resistance of 20 ohms / cm2 into 15mm×15mm square pieces. Use acetone, special detergent for micron-sized semiconductors, deionized water, and isopropanol to clean ultrasonically in sequence, blow dry with nitrogen, and place in a constant temperature oven for later use. Before use, the ITO glass slides were bombarded with plasma in an oxygen plasma etcher for 4 minutes. PEDOT:PSS aqueous dispersion (about 1%) was purchased from Bayer Company, and the buffer layer was spin-coated at a high speed with a homogenizer (KW-4A), and the thickness was determined by the solution concentration and rotating speed. 500 type) measured monitoring. After the film is formed, the residual solvent is removed in a constant temperature vacuum oven. The film thickness of PEDOT:PSS on the ITO substrate is preferably about 40 nanometers. The cathode interface layer ...

Embodiment 3

[0073] Luminescence properties of organic-inorganic heterojunction light-emitting diodes with different light-emitting layer materials.

[0074] CH 3 NH 3 PB 3 , CH 3 NH 3 PbBr 3 and CH 3 NH 3 PbBr x Cl 3-x The luminescent performance of the organic-inorganic heterojunction light-emitting diode prepared for the light-emitting layer material was measured, and the results are shown in Table 2. to CH 3 NH 3 PB 3 and CH 3 NH 3 PbBr 3 The electroluminescence spectrum is scanned, and the results are as follows Figure 8 .

[0075] Table 2 Light-emitting diode device performance indicators of different light-emitting layer materials

[0076]

[0077] It can be seen from Table 2 that by changing the material of the light-emitting layer, the performance of the light-emitting diode will be changed to a certain extent. And different light-emitting layer materials will emit different light colors, CH 3 NH 3 PB 3 emits red light, while CH 3 NH 3 PbBr 3 and CH 3 ...

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Abstract

The invention discloses a manufacturing method of a solution-processed organic-inorganic planar heterojunction light emitting diode. The method comprises the following steps of (1) coating a first electrode interface layer on a first electrode surface coated on a substrate; (2) using a solution processing method to coating a luminescent layer on the first electrode interface layer; (3) using the solution processing method to coat a second electrode interface layer on the luminescent layer; (4) evaporating a metal layer on the second electrode interface layer so as to form a second electrode, wherein the luminescent layer is a solution-processed organic-inorganic hybrid material which possesses a perovskite structure and is added with a polymer additive or an inorganic material; and the polymer additive is a polymer which can be dissolved in an organic solvent and possesses a linear structure or a branched structure. Through adding the polymer additive in the luminescent layer material, luminance of the light emitting diode, luminescence efficiency and the like are greatly increased and simultaneously a light voltage of the light emitting diode is reduced.

Description

technical field [0001] The invention relates to the technical field of optoelectronic devices, in particular to a solution-processable organic-inorganic planar heterojunction light-emitting diode and a preparation method. Background technique [0002] Lighting and display are an integral part of modern human life. The development of lighting technology enables human beings to continue working and living at night. Before the invention of electric lights, humans used kerosene lamps and gas lamps to achieve night lighting. However, kerosene lamps and gas lamps have always had defects such as burning smoke and pungent odors, frequent replacement of kerosene, and fire hazards. It was not until the invention of the electric light that people's lifestyles were truly changed, allowing human activities to continue from daytime to nighttime. However, the traditional incandescent lamp emits light through thermal radiation. In fact, it converts a large amount of electrical energy into...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/00H01L51/50H01L51/52B82Y30/00H10K99/00
CPCB82Y30/00H10K71/12H10K50/11H10K50/805H10K2102/00H10K85/50
Inventor 叶轩立陈梓铭苏仕健薛启帆陈东成张重阳
Owner SOUTH CHINA UNIV OF TECH
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