Photorecycling in perovskite materials refers to the process by which emitted photons are reabsorbed and re-emitted within a material, effectively enhancing light emission efficiency and stability. This mechanism can improve the performance of perovskite-based optoelectronic devices by increasing luminescence output and mitigating non-radiative losses. Our research explores photorecycling strategies in perovskite quantum shell (QS) and nanocrystal (PNC) systems to optimize their optical properties for light-emitting applications.
(a−c) TEM images of the individual quantum shells with different core sizes. (d, e) Bulk absorption (blue) and PL (red) spectra for three core sizes. Inset: schematics of the CdS/CdSe/CdS quantum shell.
Incorporating quantum shells into perovskite-QS blend films has been shown to significantly enhance electroluminescence (EL) performance. These hybrid films demonstrated a remarkable 2.3-fold increase in external quantum efficiency and achieved a radiant exitance of 213 W/m², outperforming perovskite-only devices. Such improvements highlight the role of photorecycling in boosting emission efficiency and extending the operational lifespan of perovskite-based light-emitting diodes (LEDs). (ACS Materials Lett. 2023, 5, 5, 1411–1419)
(c) Luminance versus voltage for 3D and 3D-0D PeLECs. Inset: Operation of a 3D-0D (high PLQY) PeLEC at 4.5 V. (d) EQE vs. voltage for 3D and 3D-0D PeLECs. e) Power efficiency vs. voltage for 3D and 3D-0D PeLECs.
Further advancements in photorecycling involve embedding perovskite nanocrystals within a three-dimensional perovskite matrix. By incorporating zero-dimensional (0D) Cs₄PbBr₆ and Cs₄PbI₆ PNCs into perovskite composite films, our studies have demonstrated enhanced photoluminescence quantum yield (PLQY), improved structural stability, and greater efficiency in light-emitting applications. These findings pave the way for developing high-performance perovskite materials with superior optical and electronic properties, fostering innovation in display technology and next-generation lighting systems. (https://doi.org/10.2172/2274951)