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Multifunctional Diode Operation of Tetracene Sensitized Polymer:Fullerene Heterojunctions with Simultaneous Electroluminescence in Visible and NIR Bands
Advanced Electronic Materials ( IF 6.2 ) Pub Date : 2020-11-30 , DOI: 10.1002/aelm.202000824
Tasnuva Hamid 1 , Marcin Kielar 1, 2 , Soniya D. Yambem 3 , Ajay K. Pandey 1
Affiliation  

Multifunctional operation of tetracene/polycyclopentadithiophene‐benzothiadiazole (PCPDTBT), and tetracene sensitized PCPDTBT:fullerene bulk heterojunctions (BHJs) that work as an organic photovoltaic (OPV), organic light emitting diode (OLED), and organic photodetector (OPD) is unveiled. The multifunctional operation is underlined by a synergetic interplay between singlet and triplet energy transfer and the judicious alignment of energy levels of donor–acceptor cascade. Introduction of tetracene is shown to enhance electroluminescence (EL) at 800 nm despite the observation of a near‐complete photoluminescence quenching in BHJ systems. Signatures of triple energy transfer mediated via charge transfer states of BHJ to tetracene become apparent as the proportion of fullerene in the BHJ is increased. An optimal balance between exciton population is achieved with BHJ 1:2 that produces EL peaks at 530 and 800 nm while maintaining a respectable OPV and OPD performance. The proposed ternary system unlocks the potential of having multifunctionality within one single diode structure, and it also offers new design rules for multispectral OLEDs.

中文翻译:

四烯敏化聚合物的多功能二极管操作:可见光和NIR波段中具有同时电致发光的富勒烯异质结

并四苯并/聚环戊二噻吩-苯并噻二唑(PCPDTBT)和并四苯敏化的PCPDTBT:富勒烯本体异质结(BHJ)的多功能操作公开了,它们可以用作有机光伏(OPV),有机发光二极管(OLED)和有机光电探测器(OPD)。单线态和三线态能量转移之间的协同相互作用以及供体-受体级联能级的明智调整强调了多功能操作。尽管在BHJ系统中观察到接近完全的光致发光猝灭,但引入并四苯显示出可增强800 nm处的电致发光(EL)。随着BHJ中富勒烯比例的增加,通过BHJ向并四苯的电荷转移状态介导的三重能量转移的特征变得明显。使用BHJ 1:2可以在激子总数之间实现最佳平衡,该BHJ在530和800 nm处产生EL峰,同时保持可观的OPV和O​​PD性能。所提出的三元系统释放了在单个二极管结构中具有多功能性的潜力,并且还为多光谱OLED提供了新的设计规则。
更新日期:2021-01-14
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