Publication date: 8th July 2026
Lead halide perovskite nanocrystals (NCs) are promising materials for optically-pumped lasers operating in the visible range, owing to their exceptional optical gain properties and reduced non-radiative recombination losses arising from their defect-tolerant nature. In previous work of the group, it was shown that nanosecond-excited amplified spontaneous emission (ASE) can be optimized using the transparent biopolymer cellulose acetate (CA) as spacer layer to produce polymer–CsPbX3 NC multilayer architectures. Additionally, experiments showed that such multilayers can be deposited in thin, free-standing membranes that exhibit improved ASE figures of merit due to more efficient optical confinement and waveguiding properties compared to multilayers deposited in conventional quartz substrates [1].
Herein, the methodology is extended towards thicker perovskite nanocrystal–polymer multilayers comprising up to 20-layer pairs on both rigid and flexible substrates. Photoluminescence (PL) and amplified spontaneous emission (ASE) are reproducibly optimized for different multilayer thicknesses namely thick 6–8 pairs and thin 2–3 pairs, respectively, reflecting the competing effects of optical confinement and photon recycling for PL, and increased reabsorption, scattering, Auger recombination for ASE. Free-standing CA membrane architectures further enhance optical confinement and reduce ASE thresholds compared to glass-supported structures across all multilayer thicknesses. Finally, preliminary "origami" architectures are realized by folding multilayer membranes to increase the optical interaction length without additional deposition, as a scalable approach towards devices such as luminescent solar concentrators and radiation scintillators.
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