Efficient Blue Perovskite Light‐Emitting Diodes Boosted by 2D/3D Energy Cascade Channels,Advanced Functional Materials

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Efficient Blue Perovskite Light‐Emitting Diodes Boosted by 2D/3D Energy Cascade Channels
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2020-05-20 , DOI: 10.1002/adfm.202001732
Fengjuan Zhang _{1,

2} , Bo Cai _{1,

2} , Jizhong Song _{1,

2,

3} , Boning Han _{1,

2} , Baisong Zhang _{1,

2} , Haibo Zeng _{1,

2}

Affiliation

Lead halide perovskite, as an emerging semiconductor, provides a fire‐new opportunity for high‐definition display and solid‐state lighting. Earthshaking improvements are implemented in green, red, and near‐infrared perovskite light‐emitting diodes (PeLEDs). However, blue PeLEDs are still far behind in performance, which restricts the development of PeLEDs in practical applications. Herein, a facile energy cascade channel strategy via one‐step self‐organized and controllable 2D/3D perovskite preparation by introducing guanidine hydrobromide (GABr) is developed that greatly improves the efficiency of blue PeLEDs. The 2D/3D perovskite structure boosts the energy cascade to induce energy transfer from the wide into the narrow bandgap domains and inhibit free charge diffusion, which increases the density of electrons and holes, and enhances the radiative recombination. Profiting from this energy cascade channels, the external quantum efficiency of blue PeLEDs, emitting at 492 nm, is considerably enhanced from 1.5% of initial blue device to 8.2%. In addition, device operating stability under ambient conditions is also improved by 2.6‐fold. The one‐step self‐organized 2D/3D hybrid perovskites induced by GABr pave a new and simple route toward high‐performance blue emission PeLEDs.

中文翻译：

通过2D / 3D能量级联通道增强的高效蓝色钙钛矿发光二极管

钙钛矿卤化物作为一种新兴的半导体，为高清显示器和固态照明提供了全新的机会。绿色，红色和近红外钙钛矿发光二极管（PeLED）实现了翻天覆地的变化。但是，蓝色PeLED的性能仍然远远落后，这限制了PeLED在实际应用中的发展。本文提出了一种通过引入氢溴酸胍（GABr）一步一步自组织和可控制的2D / 3D钙钛矿制备的能量级联通道策略，该方法大大提高了蓝色PeLED的效率。2D / 3D钙钛矿结构增强了能量级联，从而引发了从宽能带到窄带隙域的能量转移并抑制了自由电荷的扩散，从而增加了电子和空穴的密度，并增强了辐射复合。得益于这种能量级联通道，在492 nm处发射的蓝色PeLED的外部量子效率从初始蓝色器件的1.5％大大提高到8.2％。此外，设备在环境条件下的运行稳定性也提高了2.6倍。GABr诱导的一步一步自组织2D / 3D混合钙钛矿为高性能蓝光发射PeLED铺平了一条新的简单途径。

更新日期：2020-07-02

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