The success in pressure-induced emission (PIE) from hybrid perovskites greatly facilitates the potential development of high-efficiency white-light-emitting diodes and scintillators. However, its reversibility essentially inhibits practical applications. Furthermore, the urgent demand for scintillators requests fast decay response time and a large Stokes shift that suppresses self-adsorption. Here, we report the quantitative steric hindrance effect of different organic components in hybrid perovskites. Moreover, 1-(2-naphthyl)methanamine (NAPH)⁺ with a complex configuration is further introduced to experimentally prepare the 2D hybrid perovskite (NAPH)₂PbCl₄ nanoplates. Notably, benefiting from the increased barrier of phase transition associated with a high steric effect index (SEI) of 5.98, the harvested amorphous phase exhibits twice more intensity than the initial emission, a shortened decay time of 1.73 ns, and an enlarged Stokes shift of 260.7 nm. This study establishes the correlation between PIE retention and steric hindrance, improving the material design and synthesis for applications in white-light-emitting diodes and scintillators.

杂化钙钛矿在压力诱导发光（PIE）方面的成功极大地促进了高效白光发光二极管和闪烁体的潜在发展。然而，它的可逆性本质上限制了实际应用。此外，对闪烁体的迫切需求要求快速衰减响应时间和抑制自吸附的大斯托克斯位移。在这里，我们报告了杂化钙钛矿中不同有机成分的定量空间位阻效应。此外，进一步引入具有复杂构型的1-(2-萘基)甲胺(NAPH) ^{+实验制备二维杂化钙钛矿(NAPH)} ₂ PbCl ₄纳米片。值得注意的是，受益于与 5.98 的高空间效应指数 (SEI) 相关的相变势垒增加，收获的非晶相的强度是初始发射的两倍，衰减时间缩短为 1.73 ns，斯托克斯位移扩大为260.7 纳米。这项研究建立了 PIE 保留和空间位阻之间的相关性，改进了白光发光二极管和闪烁体应用的材料设计和合成。