INS5-0998
Ligand Engineering of Anisotropic Perovskite Nanoplatelets to Control Outcoupling and Polarised Light Emission
When and Where
Oct 1, 2026
14:50 - 15:15
Presenter(s)
Robert Hoye (University of Oxford)
Co-Author(s)
Abstract
Metal-halide perovskites exhibit bright and sharp luminescence, with optoelectronic properties that can be tuned over a wide range through solution processing [1,2]. By making perovskite nanocrystals anisotropic, we can achieve both exciton fine structure splitting as well as control over the horizontal transition dipole moment. In this talk, I will discuss our recent works focussed on self assembling these nanoplatelets, and tuning their orientation. Through control over the solvent evaporation rate, we tune the orientation of alpha-phase CsPbI3 from face-down to edge-up. The former ensures maximum outcoupling in the normal direction, and we achieve pure-red nanoplatelet LEDs with external quantum efficiency reaching up to 13% when incorporating phosphonic acid passivation [3]. On the other hand, by self-assembling the nanoplatelets edge-up, we achieved polarized light emission directly from the LEDs without requiring a photonic grating [4]. The degree of polarisation (DOP) achieved exceeded 70%, which is comparable to the DOP of single particles [4]. Furthermore, we alloy FA into the A-site of these perovskites to improve their stability [5]. Through detailed 1H-NMR measurements and computations, we show that FA incorporation improves stability by binding more strongly to the organic ligands coordinated to the surface through H-bonding [5]. Finally, we extend these findings to CsPbBr3 perovskite nanoplatelets, revealing how improved control over their orientation could be achieved by tuning the length and shape of organic backbone of the ligands used [6].
[1] Ye, …, Hoye,* Chem. Soc. Rev., 53, 9085 (2024)
[2] Ye, Mondal, …, Hoye,* Nat. Commun., 15, 8120 (2024)
[3] Kim, Jeong, …, Islam,* Lee,* Song,* Hoye,* arXiv: 2511.11107 (2026)
[4] Ye, …, Hoye,* Nature Photonics, 18, 586 (2024)
[5] Jeong, …, Lee,* Hoye,* Light Sci. Appl., 15, 22 (2026)
[6] Lee, Bae, …, Choi,* Song,* Hoye,* Matter, 102760 (2026). DOI: 10.1016/j.matt.2026.102760
[1] Ye, …, Hoye,* Chem. Soc. Rev., 53, 9085 (2024)
[2] Ye, Mondal, …, Hoye,* Nat. Commun., 15, 8120 (2024)
[3] Kim, Jeong, …, Islam,* Lee,* Song,* Hoye,* arXiv: 2511.11107 (2026)
[4] Ye, …, Hoye,* Nature Photonics, 18, 586 (2024)
[5] Jeong, …, Lee,* Hoye,* Light Sci. Appl., 15, 22 (2026)
[6] Lee, Bae, …, Choi,* Song,* Hoye,* Matter, 102760 (2026). DOI: 10.1016/j.matt.2026.102760
