학술논문
Direct Linearly-Polarised Electroluminescence from Perovskite Nanoplatelet Superlattices
Document Type
Working Paper
Author
Ye, Junzhi; Ren, Aobo; Dai, Linjie; Baikie, Tomi; Guo, Renjun; Pal, Debapriya; Gorgon, Sebastian; Heger, Julian E.; Huang, Junyang; Sun, Yuqi; Arul, Rakesh; Grimaldi, Gianluca; Zhang, Kaiwen; Shamsi, Javad; Huang, Yi-Teng; Wang, Hao; Wu, Jiang; Koenderink, A. Femius; Murciano, Laura Torrente; Schwartzkopf, Matthias; Roth, Stephen V.; Muller-Buschbaum, Peter; Baumberg, Jeremy J.; Stranks, Samuel D.; Greenham, Neil C.; Polavarapu, Lakshminarayana; Zhang, Wei; Rao, Akshay; Hoye, Robert L. Z.
Source
Subject
Language
Abstract
Polarised light is critical for a wide range of applications, but is usually generated by filtering unpolarised light, which leads to significant energy losses and requires additional optics. Herein, the direct emission of linearly-polarised light is achieved from light-emitting diodes (LEDs) made of CsPbI3 perovskite nanoplatelet superlattices. Through use of solvents with different vapour pressures, the self-assembly of perovskite nanoplatelets is achieved to enable fine control over the orientation (either face-up or edge-up) and therefore the transition dipole moment. As a result of the highly-uniform alignment of the nanoplatelets, as well as their strong quantum and dielectric confinement, large exciton fine-structure splitting is achieved at the film level, leading to pure-red LEDs exhibiting a high degree of linear polarisation of 74.4% without any photonic structures. This work unveils the possibilities of perovskite nanoplatelets as a highly promising source of linearly-polarised electroluminescence, opening up the development of next-generation 3D displays and optical communications from this highly versatile, solution-processable system.
Comment: 26 pages, 5 figures
Comment: 26 pages, 5 figures