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Mixed Spacer Cation Stabilization of Blue‐Emitting n = 2 Ruddlesden–Popper Organic–Inorganic Halide Perovskite Films
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2019-12-15 , DOI: 10.1002/adom.201901679
Tik Lun Leung 1 , Ho Won Tam 1 , Fangzhou Liu 1 , Jingyang Lin 1 , Alan Man Ching Ng 2 , Wai Kin Chan 3 , Wei Chen 4 , Zhubing He 4 , Ivor Lončarić 5 , Luca Grisanti 5 , Chao Ma 6 , Kam Sing Wong 6 , Ying Suet Lau 7 , Furong Zhu 7 , Željko Skoko 8 , Jasminka Popović 9 , Aleksandra B. Djurišić 1
Affiliation  

Ruddlesden–Popper halide perovskite (RPP) materials are of significant interest for light‐emitting devices since their emission wavelength can be controlled by tuning the number of layers n, resulting in improved spectral stability compared to mixed halide devices. However, RPP films typically contain phases with different n, and the low n phases tend to be unstable upon exposure to humidity, irradiation, and/or elevated temperature which hinders the achievement of pure blue emission from n = 2 films. In this work, two spacer cations are used to form an RPP film with mixed cation bilayer and high n = 2 phase purity, improved stability, and brighter light emission compared to a single spacer cation RPP. The stabilization of n = 2 phase is attributed to favorable formation energy, reduced strain, and reduced electron–phonon coupling compared to the RPP films with only one type of spacer cation. Using this approach, pure blue light‐emitting diodes (LEDs) with Commission Internationale de l'éclairage (CIE) coordinates of (0.156, 0.088) and excellent spectral stability are achieved.

中文翻译:

蓝光n = 2的Ruddlesden-Pop有机-无机卤化物钙钛矿薄膜的混合间隔物阳离子稳定性

Ruddlesden–Popper卤化物钙钛矿(RPP)材料对于发光器件非常重要,因为可以通过调节层数n来控制其发射波长,与混合卤化物器件相比,可以提高光谱稳定性。然而,RPP膜通常包含具有不同n的相,并且低n相在暴露于湿气,辐射和/或高温时趋于不稳定,这阻碍了从n = 2膜获得纯蓝色发射。在这项工作中,使用两个间隔阳离子形成具有混合阳离子双层和高n的RPP膜。与单一间隔阳离子RPP相比,具有2相纯度,更高的稳定性和更明亮的发光。与仅具有一种间隔阳离子的RPP薄膜相比,n = 2相的稳定归因于良好的形成能,降低的应变以及降低的电子-声子耦合。使用这种方法,可以得到国际照明委员会(CIE)坐标为(0.156,0.088)的纯蓝色发光二极管(LED),并具有出色的光谱稳定性。
更新日期:2020-02-19
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