Dielectric screening enabled ultrastable luminescence in CsPbBr3 perovskite crystal encapsulated by ferroelectric Poly(vinylidene fluoride)
Dielectric screening enabled ultrastable luminescence in CsPbBr3 perovskite crystal encapsulated by ferroelectric Poly(vinylidene fluoride)
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介电屏蔽使铁电聚偏二氟乙烯封装的 CsPbBr3 钙钛矿晶体实现超稳定发光
DOI：
10.1016/j.cej.2020.126120
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发表时间：
2020-12
影响因子：
15.1
通讯作者：
Yuan Deng
中科院分区：
文献类型：
--
作者：
Chen Huang;Yao Wang;Ziwei Cheng;Yu Wu;Jiaxin Li;Yuan Deng
金属卤化物钙钛矿纳米晶体（NCs）正在成为消费光电子器件领域半导体纳米晶体的竞争性替代品；然而，提高它们的长期稳定性仍需要广泛的研究。用聚合物封装钙钛矿纳米粒子是一种很有前途的策略，但聚合物基质对钙钛矿激子的介电屏蔽效应却很少被考虑。在这里，我们在高介电常数聚偏氟乙烯（PVDF）封装CsPbBr3（CPB）晶体CPB/PVDF复合薄膜中证明了这种效应。通过多尺度结构观察，揭示了CPB晶体在前驱体中随浓度的非均匀生长机理。研究了不同CPB浓度下CPB/PVDF复合材料的综合物理性能。前驱体CPB浓度增加至饱和时，制备的复合膜均显示出明亮的发光，荧光寿命高达τavg= 731 ns，远优于其他低介电常数聚合物封装的CPB复合材料。CPB中的电子-空穴库仑相互作用与其周围的高介电常数PVDF之间的强相互作用可以理解其稳定发光。同时，CPB与PVDF的界面相互作用极大地影响了PVDF聚合物在纳米尺度上的结晶行为，从而改变了CPB/PVDF复合膜的介电性能和力学性能。最后，在绿光CPB/PVDF薄膜的基础上组装了暖白光发光二极管器件，积极预示了其在高性能光电器件中的潜在应用。
Metal halide perovskites nanocrystals (NCs) are emerging as competitive alternatives for semiconductor NCs in the fields of consumer optoelectronic devices; however, boosting their long-term stability still needs extensive study. Encapsulation of perovskite NCs with polymer becomes a promising strategy, yet the dielectric screening effect on the excitons of perovskites from the polymer matrix has seldom been considered. Here, we demonstrated this effect in high-permittivity poly(vinylidene fluoride) (PVDF) encapsulated CsPbBr3(CPB) crystals CPB/PVDF composites films. Thein situnonuniform growth mechanism of CPB crystal with respect to its concentration in the precursor was revealed from multiscale structure observations. Comprehensive physical properties of CPB/PVDF composites with varying CPB concentrations were thoroughly investigated. Composite films made from precursors with CPB concentration increasing to saturation all showed bright luminescence, and an exceptional long fluorescence lifetime up to τavg= 731 ns was observed, much superior to other polymers with lower permittivity encapsulated CPB composites. The stable luminescence is understood from the strong interplay between electron-hole Coulomb interactions in CPB and its surrounding high-permittivity PVDF. Meanwhile, the interfacial interaction between CPB and PVDF greatly influenced the crystallization behavior of PVDF polymer at nanoscale, thus altered the dielectric and mechanical properties of CPB/PVDF composite films accordingly. Finally, a warm white light-emitting diode device was assembled based on green light emitting CPB/PVDF film, positively implying its potential application in high-performance optoelectronic devices.
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具有高发光效率和辐照稳定性的 CsPbBr3 量子点薄膜用于辐射发光核电池应用
影响因子：
9.5
作者：
Xu Zhiheng;Tang Xiaobin;Liu Yunpeng;Zhang Zhengrong;Chen Wang;Liu Kai;Yuan Zicheng
通讯作者：
Yuan Zicheng
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影响因子：
17.1
作者：
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通讯作者：
Eychmueller, Alexander
影响因子：
9.5
作者：
A. Sultana;Priyabrata Sadhukhan;Md. Mehebub Alam;Sachindranath Das;T. Middya;D. Mandal
通讯作者：
A. Sultana;Priyabrata Sadhukhan;Md. Mehebub Alam;Sachindranath Das;T. Middya;D. Mandal
影响因子：
10.8
作者：
Raino, Gabriele;Landuyt, Annelies;Kovalenko, Maksym V.
通讯作者：
Kovalenko, Maksym V.
影响因子：
10.8
作者：
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通讯作者：
Kovalenko MV