Citation: Ai-hui Liang, Han Wang, Tian Cao, Ming Luo, De-wang Liu, Yi Chen, Zhi-ping Wang. Synthesis and Properties of Phosphorescent Polymers with Aggregation-induced Emission[J]. Acta Polymerica Sinica, ;2019, 50(1): 27-35. doi: 10.11777/j.issn1000-3304.2018.18160 shu

Synthesis and Properties of Phosphorescent Polymers with Aggregation-induced Emission

Key Laboratory of Functional Small Organic Molecule, Ministry of Education, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022

Corresponding author: Ai-hui Liang, lah14god@163.com
Received Date: 10 July 2018
Revised Date: 25 July 2018
Available Online: 21 September 2018

A series of phosphorescent polymers with aggregation-induced emission (AIE) feature were synthesized by palladium-catalyzed Suzuki polycondensation of tetraphenylethene (TPE), iridium complex and 9,9-dioctylfluorene. All the obtained polymers are soluble in common organic solvents, such as chloroform, dichloromethane and tetrahydrofuran (THF), at room temperature, but insoluble in water. Their thermal and photophysical properties, as well as AIE performance of the resulting phosphorescent polymers are investigated with different feed ratios of iridium complex varing from 0.5% to 4%. These polymers display good thermal properties with a high thermal degradation temperature (> 300 °C) and glass transition temperature (≈ 100 °C). Polymer PFTPE displays the maximum photoluminescent (PL) emission at 440 nm. Relative to PFTPE, all the phosphorescent polymers prepared with iridium complex feed ratios in the range of 0.5% − 4% emit green light with an emission peak at about 505 nm. AIE performances of these phosphorescent polymers are examined by studying the PL emission behaviour of their diluted mixture in THF/water under different water fractions (f_w). The aggregates are prepared by adding different fractions (f_w = 0% to 90%) of ultra-pure water into THF solution. Both PL intensity and quantum yield (Ф_PL) of PFTPE-Fir0.5 and PFTPE-Fir1 exhibit an upward trend with the increasing f_w from 0% to 80%. However, when f_w further increases from 80% to 90%, PL intensity and Ф_PL show downward trend. The maximum values of Ф_PL are 37.3% for PFTPE-FIr0.5 and 38.6% for PFTPE-FIr1, respectively. Similarly, PL intensity and Ф_PL of PFTPE-FIr2 and PFTPE-FIr4 display the same behaviour as PFTPE-FIr0.5 and PFTPE-FIr1. And PFTPE-FIr2 and PFTPE-FIr4 reach the maximum Ф_PL value of 37.2% and 39.9%, respectively, at f_w of 30%. This indicates that these phosphorescent polymers have AIE feature, suggesting that they are potential materials for fabrication of organic light-emitting diodes and fluorescent sensors.
- Aggregation-induced emission,
- Iridium complex,
- Phosphorescent polymer,
- Tetraphenylethene
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