Tunable aggregation-induced emission in π-extended Aroylthiophene–Carbazole emitters
學年 114
學期 1
出版（發表）日期 2026-01-06
作品名稱 Tunable aggregation-induced emission in π-extended Aroylthiophene–Carbazole emitters
作品名稱（其他語言）
著者 Ajeet Kumar Sharma; Panaha; K.R. Justin Thomas; Cheng-Jui Wu; Dian Luo; Shun-Wei Liu; Chih-Hsin Chen
單位
出版者
著錄名稱、卷期、頁數 Dyes and Pigments 248, p. 113556
摘要 Benzophenone derivatives have gained substantial attention as versatile acceptor cores for developing efficient emissive materials in organic light-emitting diodes (OLEDs). The photophysical properties of these materials can be systematically tuned through the introduction of electron-donating groups, enabling control over fluorescence, thermally activated delayed fluorescence (TADF), or room-temperature phosphorescence (RTP). In this study, we designed and synthesized a new series of aroylthiophene-based emitters containing N-phenylcarbazole (N-PhCbz) donors and various aryl fragments such as naphthyl, anthracene, and pyrene. Theoretical calculations indicate that the large singlet–triplet energy gaps render these systems unfavorable for TADF, yet their emission behaviors are markedly sensitive to aggregation. The naphthyl and pyrene derivatives exhibit aggregation-induced emission enhancement (AIEE) aided by hydrogen bonding which restricts intramolecular rotation (RIR), whereas the anthracene analogue displays aggregation-caused quenching (ACQ). The pyrene derivative shows a distinct, red-shifted absorption and 3.2-fold emission enhancement in 90 % water–THF mixture due to ordered morphology of aggregate, which is supported by SEM analysis and lifetime measurement in different water fractions. All compounds exhibit solvent-dependent emission, showing a linear correlation in the Lippert–Mataga plot, while their high decomposition temperatures (≥317 °C) confirm excellent thermal stability. Non-doped OLEDs fabricated using these emitters demonstrate efficiencies, with the pyrene derivative achieving the highest external quantum efficiency (EQE) of 0.51 %. These results provide valuable insights into the structure–property relationship of aroylthiophene-based emitters and suggest potential for developing aggregation-enhanced emitters for optoelectronic applications.
關鍵字
語言 en
ISSN
期刊性質 國外
收錄於 SCI Scopus
產學合作
通訊作者
審稿制度 是
國別 BES
公開徵稿
出版型式 ,電子版,紙本
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機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/129199 )