论文标题
基于定向的钙钛矿纳米片的有效发光二极管
Efficient light-emitting diodes based on oriented perovskite nanoplatelets
论文作者
论文摘要
解决方案处理的平面钙钛矿发光二极管（LED）有望高性能和具有成本效益的电致电（EL）设备，非常适合大面积显示和照明应用。预计具有高比例的水平过渡偶极矩（TDM）的发射层将增强平面LED的光子超出耦合。然而，由于同时控制TDM的方向的困难，基于各向异性钙钛矿纳米仪的LED仍然是低效的（外部量子效率，EQE <5％），因此达到了高光发光量子量产率（PLQYS）（PLQYS）（PLQYS），并实现了组成的膜的膜平衡。在这里，我们从现场种植的连续钙钛矿膜中展示了有效的EL，该薄膜由面部面向纳米片的单层组成。钙钛矿纳米片膜的水平TDM比率约为84％，大大高于各向同性发射剂（67％）。纳米片膜显示出〜75％的高PLQY。这些优点使LED具有23.6％的峰值EQE，代表最有效的钙钛矿LED。
Solution-processed planar perovskite light-emitting diodes (LEDs) promise high-performance and cost-effective electroluminescent (EL) devices ideal for large-area display and lighting applications. Exploiting emission layers with high ratios of horizontal transition dipole moments (TDMs) is expected to boost photon outcoupling of planar LEDs. However, LEDs based on anisotropic perovskite nanoemitters remains to be inefficient (external quantum efficiency, EQE <5%), due to the difficulties of simultaneously controlling the orientations of TDMs, achieving high photoluminescence quantum yields (PLQYs) and realizing charge balance in the films of the assembled nanostructures. Here we demonstrate efficient EL from an in-situ grown continuous perovskite film comprising of a monolayer of face-on oriented nanoplatelets. The ratio of horizontal TDMs of the perovskite nanoplatelet films is ~84%, substantially higher than that of isotropic emitters (67%). The nanoplatelet film shows a high PLQY of ~75%. These merits enable LEDs with a peak EQE of 23.6%, representing the most efficient perovskite LEDs.
