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<p>Polymers play an important role in the development of organic light emitting diodes (OLEDs) because of their light weight, flexibility, solution processability, outstanding photophysical properties, stability and improved device efficiency. Perylene bisimide (PBI or PDI) derivatives have become attractive options for OLEDs due to their excellent electron transport properties, high thermal and photochemical stability, high fluorescence efficiency and tunable optical properties. But the synthesis of PBI polymers with solution processability is still existing as challenges which prevent their wider use. Most of the reported PBI polymers showed poor solubility due to strong π-π stacking, which prevent them to process using low-cost fabrication techniques like spin coating or inkjet printing. This study addresses this issue by the synthesis of an amino acid-based PBI copolymer using the condensation polymerization reaction between hydroxyl group functionalized PBI derivative and amino acid-based esters. The chemical structure of polymer is studied by using Infrared spectrometer and molecular weights were determined by using Gel Permeation Chromatography (GPC). This polymer is soluble in common organic solvents like chloroform, acetone, tetrahydrofuran etc. Thermogravimetric Analysis (TGA) studies showed that this polymer is stable up to 345&#xa0;°C. The polymer demonstrated strong light absorption in the UV-visible region from 300&#xa0;nm to 600&#xa0;nm range and strong fluorescence emission from 500&#xa0;nm to 700&#xa0;nm range. This polymer showed strong fluorescence emission even in solid state, with quantum yield of 14.50%. It showed green emission in solution state and strong red emission in solid state. The solution processability, absorption and emission properties of this polymer offering a new material for OLED application.</p>

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Solution processable amino acid-based perylene bisimide polymers for organic light emitting diode applications

  • 期刊论文

  • 发表日期：

    2026年1月12日

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  • S. Kumari Nisha,
  • S. Sreelekshmi,
  • S. Achutha,
  • B. Sruthy

摘要

Polymers play an important role in the development of organic light emitting diodes (OLEDs) because of their light weight, flexibility, solution processability, outstanding photophysical properties, stability and improved device efficiency. Perylene bisimide (PBI or PDI) derivatives have become attractive options for OLEDs due to their excellent electron transport properties, high thermal and photochemical stability, high fluorescence efficiency and tunable optical properties. But the synthesis of PBI polymers with solution processability is still existing as challenges which prevent their wider use. Most of the reported PBI polymers showed poor solubility due to strong π-π stacking, which prevent them to process using low-cost fabrication techniques like spin coating or inkjet printing. This study addresses this issue by the synthesis of an amino acid-based PBI copolymer using the condensation polymerization reaction between hydroxyl group functionalized PBI derivative and amino acid-based esters. The chemical structure of polymer is studied by using Infrared spectrometer and molecular weights were determined by using Gel Permeation Chromatography (GPC). This polymer is soluble in common organic solvents like chloroform, acetone, tetrahydrofuran etc. Thermogravimetric Analysis (TGA) studies showed that this polymer is stable up to 345 °C. The polymer demonstrated strong light absorption in the UV-visible region from 300 nm to 600 nm range and strong fluorescence emission from 500 nm to 700 nm range. This polymer showed strong fluorescence emission even in solid state, with quantum yield of 14.50%. It showed green emission in solution state and strong red emission in solid state. The solution processability, absorption and emission properties of this polymer offering a new material for OLED application.