Abstract: Quasi-two-dimensional (Q-2D) perovskite is a promising material that can be applied in novel optoelectronic devices due to its large exciton binding energy and quantum-confined effects. However, Q-2D perovskites exhibit multiphase structures with grain boundaries and interfaces, leading to non-radiative losses during energy transfer. In this work, we achieved a more efficient energy transfer in the Q-2D perovskite by regulating the crystallization kinetic processes in different n-phases. Control of the Q-2D perovskite nucleation and growth process was realized by introducing sodium ions into the Q-2D perovskite precursors. It is found that the incorporation of sodium ions promotes the nucleation of the high n-phase, making the different n-phases more evenly distributed in space, and the characterization of the lifetime confirms that sodium ions doping promotes energy transfer. Thanks to this efficient energy transfer process, the optical amplification threshold of doped films is decreased from 23.3 μJ·cm-2 to 14.3 μJ·cm-2. The results provide a new effective method to optimize the photonics properties of Q-2D perovskites, thus further broadening the range of photonics applications of Q-2D perovskites.
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2024, Vol. 38 
