High Efficiency Blue and Green Light-Emitting Diodes Using Ruddlesden-Popper Inorganic Mixed Halide Perovskites with Butylammonium Interlayers
High Efficiency Blue and Green Light-Emitting Diodes Using Ruddlesden-Popper Inorganic Mixed Halide Perovskites with Butylammonium Interlayers
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DOI：
10.1021/acs.chemmater.8b02999
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发表时间：
2019-01-08
影响因子：
8.6
通讯作者：
Halpert, Jonathan E.
中科院分区：
文献类型：
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作者：
Vashishtha, Parth;Ng, Michael;Halpert, Jonathan E.
Ruddlesden-Popper相无机金属卤化物钙钛矿是具有高亮度和色纯度的高效发光二极管（LED）的有希望的候选者。在这里，我们展示了由原位生长的CsPbX 3准2D/3D薄膜制成的LED，这些薄膜在整个可见光谱范围内都是颜色可调的。CsPbX 3纳米片用于制备RP相钙钛矿，使用丁基铵作为分离配体以制备BA（2）Cs（n-1）Pb（n）（Br/Y）（3 n +1）2D/3D混合卤化物薄膜，其中Y = Cl或I。通过改变丁基铵的浓度，在这些晶体中的CsPbBr 3单层的数量进行了优化。我们证明了一个稳定的钙钛矿相，具有薄的发射线宽度，提供覆盖CIE三角形边缘的点和类似于国家电视系统委员会颜色标准的130%的最大红/绿色/蓝色覆盖率。此外，我们能够报告蓝光发射钙钛矿LED的创纪录效率，在465和487 nm处的最大外量子效率（EQE）为2.4%和6.2%，最大亮度为3340 cd/m2。我们还展示了高效的绿色LED，其最大效率为10.1%EQE，23.3 cd/A和9.8 lm/W（16.3 mA/cm（2））。
Ruddlesden-Popper phase inorganic metal halide perovskites are promising candidates for efficient light-emitting diodes (LEDs) with high brightness and color purity. Here, we demonstrate LEDs made from in situ grown CsPbX3 quasi 2D/3D thin films that are color tunable across the entire visible spectrum. CsPbX3 nanosheets are used to produce RP phase perovskites using butylammonium as a separating ligand to create BA(2)Cs(n-1)Pb(n) (Br/Y)(3n+1) 2D/3D mixed halide thin films, where Y = Cl or I. The number of CsPbBr3 monolayers in these crystals was optimized by changing the butylammonium concentration. We demonstrate a stable perovskite phase with thin emission line widths providing points covering the edge of the CIE triangle and a maximum red/green/blue coverage of similar to 130% of the National Television System Committee color standard. Additionally, we are able to report record efficiencies for blue emitting perovskite nanocrystal LEDs with a maximum external quantum efficiency (EQE) of 2.4% and 6.2% at 465 and 487 nm and a maximum luminance of 3340 cd/m(2). We also demonstrate efficient green LEDs with a maximum efficiency of 10.1% EQE, 23.3 cd/A and 9.8 lm/W at 16.3 mA/cm(2).