Highly Efficient, Spatially Pure Circularly Polarized Luminescence from Bilayer Self‐Assembled Colloidal Quantum Wells and Soft Helical Superstructures

Highly Efficient, Spatially Pure Circularly Polarized Luminescence from Bilayer Self‐Assembled Colloidal Quantum Wells and Soft Helical Superstructures

Advanced Science

10.1002/advs.202509122

https://doi.org/10.1002/advs.202509122

Xiao Liang, Thi Thu Ha Do, Lu ding, Furkan Isik, Anupam Sadhu, Emek G. Durmusoglu, Syed Akhil, Betul Canimkurbey, Lydia H. Wong, Son Tung Ha, Arseniy I. Kuznetsov, Hilmi Volkan Demir

13 August 2025

Liang, X., Do, T. T. H., Ding, L., Isik, F., Sadhu, A., Durmusoglu, E. G., Akhil, S., Canimkurbey, B., Wong, L. H., Ha, S. T., Kuznetsov, A. I., & Demir, H. V. (2025). Highly Efficient, Spatially Pure Circularly Polarized Luminescence from Bilayer Self‐Assembled Colloidal Quantum Wells and Soft Helical Superstructures. Advanced Science. Portico. https://doi.org/10.1002/advs.202509122

Circularly polarized luminescence (CPL) is important for multiple photonic technologies. It can be achieved with high asymmetry factors (glum) by combining quantum emitters (QEs) with one‐dimensional helical superstructures (1D‐HS). However, existing 1D‐HS systems face challenges of maintaining polarization purity across viewing angles, primary due to the mismatch between QE emission profiles and the photonic bandgap of 1D‐HS across off‐normal directions. Herein, efficient and controllable CPL is proposed and developed using the self‐assembly of colloidal quantum wells (CQWs) coupled with cholesteric liquid crystals (CLCs). The face‐down CQWs assemblies with over 90% in‐plane transition dipole moments enables directional emission along the liquid crystal helical axis within the light escape cone. At the same time aligning their narrow emission spectra to the edge of the CLCs reflection band significantly enhances the spectral coupling. This results in highly efficient CPL with an improved glum of 1.47–1.82 (±0.03) over an expanded viewing range (±40°) and a large increase (53.3%) in extraction efficiency, supported by comprehensive angle‐resolved and wavelength‐resolved spectroscopy as well as optical simulations. Moreover, this approach facilitates the development of novel anti‐peeping and angle‐dependent luminescent devices. This work establishes a versatile platform for spatially homogeneous and tunable CPL in next‐generation photonic systems.

Attribution 4.0 International (CC BY 4.0)

This research / project is supported by the Agency for Science, Technology and Research - Manufacturing, Trade, and Connectivity Programmatic Fund - Nanoantenna Light Emitting Devices
Grant Reference no. : M21J9b0085

This research / project is supported by the National Research Foundation - Campus for Research Excellence and Technological Enterprise (CREATE) - Smart Grippers for Soft Robotics (SGSR) program
Grant Reference no. :

This is the peer reviewed version of the following article: Liang, X., Do, T. T. H., Ding, L., Isik, F., Sadhu, A., Durmusoglu, E. G., Akhil, S., Canimkurbey, B., Wong, L. H., Ha, S. T., Kuznetsov, A. I., & Demir, H. V. (2025). Highly Efficient, Spatially Pure Circularly Polarized Luminescence from Bilayer Self‐Assembled Colloidal Quantum Wells and Soft Helical Superstructures. Advanced Science. Portico. https://doi.org/10.1002/advs.202509122 , which has been published in final form at https://doi.org/10.1002/advs.202509122. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.

https://oar.a-star.edu.sg/communities-collections/articles/22395

2198-3844
2198-3844

Institute of Materials Research and Engineering