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Polymer material displaying blue light and preparation method thereof

A polymer material and polymer technology, used in the field of organic and polymer chemical synthesis, can solve the problems of low thermal stability, impure blue light, and reduced luminous efficiency.

Inactive Publication Date: 2007-05-23
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Alkyl-substituted polyfluorene is a typical blue-light material. Its outstanding advantages are high blue-light efficiency, good thermal stability, and easy dissolution. It is suitable for spraying operations to prepare large-area devices. However, research has found that traditional polyfluorene materials have poor thermal stability. Not high, especially when the device is in use, the molecular chains of the polyfluorene material will aggregate, causing the molecular chains (18) ππ to overlap and emit yellow light, resulting in impure blue light and lower luminous efficiency
Setayesh S. etc. introduced a large number of benzene ring structures (J.Am.Chem.Soc.2001, 123, 946, molecular structure formula 1) on the 9-position of fluorene to prevent the aggregation of polyfluorene molecules. It has the effect of curbing yellow light, but the molecule is rigid and difficult to dissolve

Method used

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  • Polymer material displaying blue light and preparation method thereof
  • Polymer material displaying blue light and preparation method thereof
  • Polymer material displaying blue light and preparation method thereof

Examples

Experimental program
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Effect test

example 1

[0024] Monomer b is TPD, monomer a 1 It is a fluorene oligomer containing fluorenol at both ends. Under the catalytic reaction of sulfuric acid, monomer b and monomer a 1 Dehydration and polycondensation into polymers in p-xylene solvent. The reacted solution was dropped into methanol 10 times as solvent to obtain a polymer precipitate, and the product was a light yellow powder solid with a yield of 85%. The molecular weight of the polymer is 30,000, and the degree of polymerization dispersion is 2.1. The synthesis process is shown in chemical reaction formula 5. Main properties of the polymer: glass transition temperature 165°C. The 5% thermal decomposition temperature is 430°C, and it is blue under ultraviolet light, and the photoluminescence efficiency of the solid film is 49%.

[0025]

[0026] Chemical Reaction Formula 5

example 2

[0028] Monomer b is TPD, monomer a 2 It is a fluorene oligomer containing fluorenol at both ends. Under the catalyzed reaction of methanesulfonic acid, monomer b and monomer a 2 Dehydration and polycondensation into polymers in mesitylene solvent. The reacted solution was dropped into methanol 10 times as solvent to obtain a polymer precipitate, and the product was a white or light yellow powder solid with a yield of 85%. The molecular weight of the polymer is 25,000, and the polymerization dispersion is 1.8. The synthesis process is shown in chemical reaction formula 6. Main properties of the polymer: glass transition temperature 234°C. The 5% thermal decomposition temperature is 437°C, and it is blue under ultraviolet light, and the photoluminescence efficiency of the solid film is 43%.

[0029]

[0030] Chemical Reaction Formula 6

example 3

[0032] Monomer b is TPA, monomer a 3 It is a fluorene oligomer containing fluorenol at both ends. Under the catalyzed reaction of methanesulfonic acid, monomer b and monomer a 3 Dehydration and polycondensation into polymers in mesitylene solvent. The reacted solution was dropped into methanol 10 times as solvent to obtain a polymer precipitate, and the product was a white or light yellow powder solid with a yield of 80%. The molecular weight of the polymer is 20,000, and the polymerization dispersion is 2.3. The synthesis process is shown in chemical reaction formula 7. Main properties of the polymer: Glass transition temperature 198°C. The 5% thermal decomposition temperature is 435°C, and it is blue under ultraviolet light, and the photoluminescence efficiency of the solid film is 42%.

[0033]

[0034] Chemical Reaction Formula 7

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Abstract

The invention relates to a kind of polymer material which can display blue light as well as preparing method: by making the metamer a which contains fluorenol structures polymerizing with triphenylamine compounds such as TPD or TPA, the producers can get the polymer material which can display blue light under ultraviolet. The vitrification temperature of the material is 100DEG C-240DEG C, the 5% thermolysis temperature is 430DEG C-440DEG C while the photoluminescence efficiency of the solid membrane is 40%- 50%.

Description

(1) Technical field [0001] The invention belongs to the field of organic and polymer chemical synthesis. Using the electrophilic substitution reaction of aromatic rings, a new polycondensation method was invented to prepare blue light materials with novel spatial structures. (2) Background technology [0002] Alkyl-substituted polyfluorene is a typical blue-light material. Its outstanding advantages are high blue-light efficiency, good thermal stability, and easy dissolution. It is suitable for spraying operations to prepare large-area devices. However, research has found that traditional polyfluorene materials have poor thermal stability. Not high, especially when the device is in use, the molecular chains of the polyfluorene material will aggregate, causing the molecular chains (18) ππ to overlap and emit yellow light, resulting in impure blue light and lower luminous efficiency. Setayesh S. etc. introduced a large number of benzene ring structures (J.Am.Chem.Soc.2001, 12...

Claims

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Application Information

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IPC IPC(8): C09K11/06C08G61/00
Inventor 全一武张晓默纪石陈庆民
Owner NANJING UNIV
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