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Non-conjugated polymer blue light material containing fluorene main chain and preparation method thereof

A technology of non-conjugated polymer and blue light material is applied in the field of non-conjugated polymer blue light material containing fluorene main chain and its preparation, which can solve the problems such as price and environmental pollution restricting development potential, reducing device efficiency, and complex process. Achieve the effects of excellent solubility, convenient film formation and low cost

Inactive Publication Date: 2017-03-29
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the traditional device structure, the light-emitting layer is host-guest doped light-emitting structure, that is, the host material responsible for transporting electrons and holes is compounded with a light-emitting guest material, but it has several obvious disadvantages: First, although the current mainstream guest unit has many The use of noble metal complexes (Ir, Pt, etc.) structures increases efficiency, but expensive prices and environmental pollution restrict its development potential; 2. The host-guest structure is a two-phase structure, which is prone to phase separation during long-term use. As a result, concentration accumulation leads to quenching and reduces device efficiency; 3. Because of its multi-layer structure, the actual production process is more complicated and the cost is higher

Method used

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  • Non-conjugated polymer blue light material containing fluorene main chain and preparation method thereof
  • Non-conjugated polymer blue light material containing fluorene main chain and preparation method thereof
  • Non-conjugated polymer blue light material containing fluorene main chain and preparation method thereof

Examples

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Effect test

Embodiment 1

[0020] 1) Synthesis of 2,7-dibromofluorene

[0021] Add 1.5 g fluorene and 3 g N-bromosuccinimide to a 100 mL three-neck flask, 20 mL solvent glacial acetic acid, nitrogen protection, stir at 25 °C for 40 min, and add 0.5 mL 48% hydrogen after the solid is completely dissolved Bromic acid, again filled with nitrogen protection. Stir for 12 h at room temperature in the dark, and stop the reaction when the color of the solution changes from orange to yellow. Add a large amount of water for suction filtration and washing, and recrystallize the solid with a mixture of ethanol and chloroform (V ethanol: V chloroform = 2:1) to obtain a white needle-like product.

[0022] 2) Synthesis of 9,9-dioctyl-2,7-dibromofluorene

[0023] In a 100 mL three-necked flask, 2 g of 2,7-dibromofluorene, 2.66 g of bromooctane, 0.0704 g of tetraethylammonium bromide, 2.4 g of sodium hydroxide, and 20 mL of solvent dimethyl sulfoxide were sequentially added. Filled with nitrogen protection. Stir for...

Embodiment 2

[0029] 1) Synthesis of 2,7-dibromofluorene

[0030] Add 1.5 g fluorene and 4.5 g N-bromosuccinimide to a 100 mL three-neck flask, 20 mL solvent glacial acetic acid, nitrogen protection, stir at 40°C for 30 min, and add 0.5 mL 48% hydrogen bromide after the solid is completely dissolved Acid, nitrogen protection again. Stir at 40°C for 7 h in the dark, and stop the reaction when the color of the solution changes from orange-red to yellow. Add a large amount of water for suction filtration and washing, and recrystallize the solid with a mixture of ethanol and chloroform (V ethanol: V chloroform = 2:1) to obtain a white needle-like product.

[0031] 2) Synthesis of 9,9-dioctyl-2,7-dibromofluorene

[0032] Into a 100 mL three-necked flask, 2 g of 2,7-dibromofluorene, 3 g of bromooctane, 0.1 g of tetraethylammonium bromide, 3 g of sodium hydroxide, and 20 mL of solvent dimethyl sulfoxide were sequentially added. Filled with nitrogen protection. Stir for 16 h at 40 °C in the dar...

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Abstract

The invention relates to a fluorene-containing main chain nonconjugated-polymer blue light material and a preparation method thereof. The structural formula of the blue light material is a host / guest integrated structure in which the polystyrene host clamps the fluorenyl guest, which is disclosed in the specification. The obtained polymer has the advantages of favorable processability, and can form a film by solution spin coating. The polymer has excellent heat stability. The polymer has the functions of both the host and guest, and is applicable to single-layer luminescent layer devices. The material has the visible violent blue-fluorescence phenomenon under the excitation of 365nm ultraviolet light. Under the excitation of 325nm wavelength, the maximum absorption peak position of the solid film in the visible light region is 410-430nm, which is the deep blue region. The material has higher quantum efficiency, and the photoluminescent external quantum efficiency of the solid powder is 8.79% when being determined by an integrating sphere mode. After the polymer material is characterized by gel permeation chromatography (GPC), the number-average molecular weight is 80000 or so, and the molecular weight distribution is 1.1 or so. The polymer has favorable solubility, and is convenient for film formation.

Description

technical field [0001] The invention relates to a non-conjugated polymer blue light material containing a fluorene main chain and a preparation method thereof. Background technique [0002] Organic small molecule electroluminescent devices (OLEDs) have attracted extensive research due to their applications in many fields such as optoelectronic devices and flat panel display technology. Small molecule materials cannot be spin-coated into films because of their solutions, resulting in high processing costs. In recent years, with the progress of science and technology and the demand for commercialization, display technology has developed towards the direction of large-scale flexible display. In addition to the advantages of high contrast, ultra-wide viewing angle, high efficiency, and high display brightness, it also has the advantages of good mechanical properties, good processing performance, flexible display, and full-color devices prepared by inkjet printing technology, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C13/70C07C2/42C09K11/06
Inventor 贺英王鑫楠曹雨吴孙奏刘为成王均安
Owner SHANGHAI UNIV
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