Enhanced Electroluminescence from a Thiophene-Based Insulated Molecular Wire
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- 作者：Gábor Méhes ; Chengjun Pan ; Fatima Bencheikh ; Li Zhao ; Kazunori Sugiyasu ; Masayuki Takeuchi ; Jean-Charles Ribierre ; Chihaya Adachi
- 刊名：ACS Macro Letters
- 出版年：2016
- 出版时间：July 19, 2016
- 年：2016
- 卷：5
- 期：7
- 页码：781-785
- 全文大小：334K
- 年卷期：0
- ISSN：2161-1653
文摘
We report on the realization of polymer light-emitting diodes (PLEDs) based on fluorescent polythiophene (PT)-based insulated molecular wires (IMWs). PLEDs using PT emitting layers traditionally have low external quantum efficiencies (ηeqe) below 0.1%. Moreover, IMWs lack a thorough exploitation for electroluminescent applications due to concerns about reduced charge transport between their chains. We constructed multilayer PLEDs containing PT IMW emitting layers that show the maximum ηeqe close to 1.4%, luminance at 3700 cd/m2, and low turn on voltage at 2.5 V. We also show a strong influence of the thickness of electron transport layer on ηeqe through device optimization and optical simulations.