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Leveraging a Stable Perovskite Composite to Satisfy Blue Electroluminescence Standards
ACS Materials Letters ( IF 9.6 ) Pub Date : 2021-08-12 , DOI: 10.1021/acsmaterialslett.1c00404 Aditya Mishra 1 , Masoud Alahbakhshi 2 , Qing Gu 2 , Anvar A. Zakhidov 3, 4, 5 , Jason D. Slinker 1, 3
ACS Materials Letters ( IF 9.6 ) Pub Date : 2021-08-12 , DOI: 10.1021/acsmaterialslett.1c00404 Aditya Mishra 1 , Masoud Alahbakhshi 2 , Qing Gu 2 , Anvar A. Zakhidov 3, 4, 5 , Jason D. Slinker 1, 3
Affiliation
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Blue electroluminescence is fundamental for many optoelectronic and lighting applications, and mixed halide perovskite light-emitting devices are under development to meet the technological demands. However, the stability of blue perovskite devices is lacking, primarily because of the halide segregation during operation that degrades the underlying perovskite structure. Saturated and stable blue emission was accomplished with a rational materials blend of a mixed halide perovskite, polymer electrolytes, and a lithium salt that selectively suppressed perovskite ion motion while facilitating the transport of the salt additive. This approach produced blue electroluminescence peaked at 464 nm that surpassed standard benchmarks with a luminance maximum of 540 cd/m2 and stable operation under constant current driving. The role of the polymer and salt additives was explored by photoluminescence, electroluminescence, scanning electron microscopy, and atomic force microscopy studies. Concerning the device, the salt ions improve electrical double layer formation and selectively move in place of the perovskite ions, while the polymers improve the uniformity and smoothness of the films. Fundamentally, each component is shown to contribute to the suppression of halide segregation for highly stable electroluminescence.
中文翻译：
利用稳定的钙钛矿复合材料满足蓝色电致发光标准
蓝色电致发光是许多光电和照明应用的基础，正在开发混合卤化物钙钛矿发光器件以满足技术需求。然而，蓝色钙钛矿器件缺乏稳定性，主要是因为操作过程中的卤化物偏析会降低底层钙钛矿结构。饱和和稳定的蓝色发射是通过混合卤化物钙钛矿、聚合物电解质和锂盐的合理材料混合物实现的，该混合物选择性地抑制钙钛矿离子运动，同时促进盐添加剂的传输。这种方法产生的蓝色电致发光在 464 nm 处达到峰值，超过了标准基准，亮度最大值为 540 cd/m 2恒流驱动下稳定运行。通过光致发光、电致发光、扫描电子显微镜和原子力显微镜研究探索了聚合物和盐添加剂的作用。关于器件，盐离子改善了双电层的形成并选择性地代替钙钛矿离子移动，而聚合物改善了薄膜的均匀性和光滑度。从根本上说，每个组分都显示出有助于抑制卤化物偏析以获得高度稳定的电致发光。
更新日期：2021-09-06
中文翻译：
利用稳定的钙钛矿复合材料满足蓝色电致发光标准
蓝色电致发光是许多光电和照明应用的基础，正在开发混合卤化物钙钛矿发光器件以满足技术需求。然而，蓝色钙钛矿器件缺乏稳定性，主要是因为操作过程中的卤化物偏析会降低底层钙钛矿结构。饱和和稳定的蓝色发射是通过混合卤化物钙钛矿、聚合物电解质和锂盐的合理材料混合物实现的，该混合物选择性地抑制钙钛矿离子运动，同时促进盐添加剂的传输。这种方法产生的蓝色电致发光在 464 nm 处达到峰值，超过了标准基准，亮度最大值为 540 cd/m 2恒流驱动下稳定运行。通过光致发光、电致发光、扫描电子显微镜和原子力显微镜研究探索了聚合物和盐添加剂的作用。关于器件，盐离子改善了双电层的形成并选择性地代替钙钛矿离子移动，而聚合物改善了薄膜的均匀性和光滑度。从根本上说，每个组分都显示出有助于抑制卤化物偏析以获得高度稳定的电致发光。
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