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Highly Efficient Energy Transfer in Light Emissive Poly(9,9-dioctylfluorene) and Poly(p-phenylenevinylene) Blend System
ACS Photonics ( IF 7 ) Pub Date : 2017-11-30 00:00:00 , DOI: 10.1021/acsphotonics.7b01177
Muhammad Umair Hassaan 1, 2, 3 , Yee-Chen Liu 1 , Kamran ul Hasan 4 , Mohsin Rafique 5 , Ali K. Yetisen 6 , Haider Butt 2 , Richard Henry Friend 1
Affiliation  

A polymer blend system F81–x:SYx based on poly(9,9-dioctylfluorene) (F8) from the family of polyfluorenes (PFO) and a poly(para-phenylenevinylene) (PPV) derivative superyellow (SY) shows highly efficient energy transfer from F8 host to SY guest molecules. This has been realized due to a strong overlap between F8 photoemission and SY photoabsorption spectra and negligibly low self-absorption. The steady-state and time-correlated spectroscopic measurements show an increased photoluminescence quantum efficiency (PLQE) and lifetime (τ) of SY, with an opposite trend of decreasing PLQE and τ of F8 excitons with increasing SY concentration, suggesting the Förster resonance energy transfer (FRET) to be the main decay pathway in the proposed system. The systematic study of the exciton dynamics shows a complete energy transfer at 10% of SY in the F8 host matrix and a Förster radius of ∼6.3 nm. The polymer blend system exhibits low laser and amplified spontaneous emission thresholds. An ultrahigh efficiency (27 cd·A–1) in F81–x:SYx based light emitting diodes (LED) has been realized due to the intrinsic property of a well-balanced charge transport within the emissive layer. The dual pathway, that is, the efficient energy transfer between the blended molecules via resonance energy transfer, and the charge-traps-assisted balanced transport makes the system promising for achieving highly efficient devices and a potential candidate for lasing applications.

中文翻译:

聚(9,9-二辛基芴)和聚(对苯撑乙烯撑)共混体系中的高效能量转移

聚合物共混体系F8 1- x:SY x基于聚芴(PFO)和聚苯二酚类的聚(9,9-二辛基芴)(F8)-亚苯基亚乙烯基)(PPV)衍生物超黄(SY)显示出从F8主体到SY客体分子的高效能量转移。由于F8的光发射光谱和SY的光吸收光谱之间有很强的重叠,并且自吸收率低到可以忽略不计,因此可以实现这一点。稳态和与时间相关的光谱测量显示SY的光致发光量子效率(PLQE)和寿命(τ)均增加,而随着SY浓度增加,F8激子的PLQE和τ降低的趋势相反,这表明Förster共振能量转移(FRET)是拟议系统中的主要衰减途径。激子动力学的系统研究表明,在F8基质中SY的10%时,能量转移完全,Förster半径约为6.3 nm。该聚合物共混物系统具有低激光和自发发射阈值。在F8 1– x:SY x中,基于–1的发光二极管(LED)已实现,这是由于发射层内的电荷传输平衡良好的内在特性。双重途径,即通过共振能量转移在混合分子之间进行有效的能量转移,以及电荷陷阱辅助的平衡传输,使该系统有望实现高效器件,并成为激光应用的潜在候选者。
更新日期:2017-11-30
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