Radiation pattern design of Perovskite light-emitting diodes by nanostructures

Perovskite light-emitting diodes (PeLEDs) are drawing great interest due to its promising applications in both high-quality display and lighting. The incorporations of nanostructures into the device have widely used to enhance the light extraction efficiency (LEE). Besides, the spatial emission pattern of PeLEDs can also be modified, which is useful in a range of scientific and industrial applications. Herein, we studied the characteristics of PeLEDs with incorporation of perovskite or Ag nanogratings into electron transport layer with finite difference-time domain (FDTD) numerical simulation method. The results clearly demonstrated that the LEE has enhanced more than three times compared with conventional planar PeLEDs. We further found that the horizontal location of emission source can greatly manipulate the radiation pattern of Ag patterned PeLEDs. The results suggest that the employment of nanostructures opens the possibility of controlling emission light. Moreover, the findings shown here will be useful to performance enhancement of other optoelectronic devices.