基于9,9-二甲基-9H-噻吨并10,10-二氧化物异构体的高效深蓝色发光聚芴,Journal of Polymer Science

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基于9,9-二甲基-9H-噻吨并10,10-二氧化物异构体的高效深蓝色发光聚芴
Journal of Polymer Science ( IF 3.9 ) Pub Date : 2020-04-06 , DOI: 10.1002/pol.20200114
Zhiqi Huang ₁ , Zhaoxi Fu ₁ , Jin Xu ₁ , Feng Peng _{1,

2} , Ting Guo ₁ , Lei Ying ₁

Affiliation

我们已经设计并通过引入缺电子9,9-二甲基-9-合成了一系列深蓝色发光聚芴，PF-27SOs和PF-36SOs，的ħ -thioxanthene 10,10-二氧化钛异构体（27SO和36SO）进入聚（9,9-二辛基芴）（PFO）骨架。与PFO相比，所得聚合物表现出同等的热分解温度（> 415°C），增强的玻璃化转变温度（> 99°C），降低的最低未占据分子轨道能级（E _LUMO）低于-2.32 eV，固体膜中的蓝移光致发光光谱最大发射波长约为422 nm，肩峰约为445 nm。所得聚合物还显示出蓝移和变窄的电致发光光谱，PF-27SO20的深蓝色国际照明委员会（CIE）坐标为（0.16，0.07），PF-36SO30的坐标为（0.16，0.06），与（ PFO为0.17、0.13）。此外，与PFO（EQE _max = 0.47％）相比，基于PF‐36SO30的简单器件具有出色的器件性能，具有最大的外部量子效率（EQE _max = 3.62 ％）。结果表明，非共轭9,9-二甲基-9 H硫代噻吨10,10-二氧化物异构体可有效扰动聚合物的共轭长度，显着削弱供体-受体系统中的电荷转移效应，显着提高电致发光器件的效率，并实现深蓝光发射。

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Efficient deep‐blue light‐emitting polyfluorenes based on 9,9‐dimethyl‐9H‐thioxanthene 10,10‐dioxide isomers

We have designed and synthesized a series of deep‐blue light‐emitting polyfluorenes, PF‐27SOs and PF‐36SOs, by introducing electron‐deficient 9,9‐dimethyl‐9H‐thioxanthene 10,10‐dioxide isomers (27SO and 36SO) into the poly(9,9‐dioctylfluorene) (PFO) backbone. Compared with PFO, the resulting polymers exhibit an equivalent thermal decomposition temperature (>415 °C), an enhanced glass transition temperature (>99 °C), a decreased lowest unoccupied molecular orbital energy level (E_LUMO) below −2.32 eV, a blue‐shifted photoluminescence spectra in solid film with a maximum emission at ~422 nm, and a shoulder peak at ~445 nm. The resulting polymers also show blue‐shifted and narrowed electroluminescence spectra with deep‐blue Commission Internationale de L'Eclairage (CIE) coordinates of (0.16, 0.07) for PF‐27SO20 and (0.16, 0.06) for PF‐36SO30, compared with (0.17, 0.13) for PFO. Moreover, simple device based on PF‐36SO30 achieves a superior device performance with a maximum external quantum efficiency (EQE_max = 3.62%) compared with PFO (EQE_max = 0.47%). The results show that nonconjugated 9,9‐dimethyl‐9H‐thioxanthene 10,10‐dioxide isomers can effectively perturb the conjugation length of polymers, significantly weaken the charge‐transfer effect in donor–acceptor systems, substantially improve electroluminescence device efficiency, and achieve deep‐blue light emission.

更新日期：2020-04-06

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