Interfacial Stress‐Modulated Mechanosensitive Upconversion Luminescence of NaErF₄ Based Heteroepitaxial Core–Shell Nanoparticles

The resulting interfacial stress in heteroepitaxial nanocomplex usually has negligible influence on its performance, but at high pressures (HP) the effect can be significantly amplified. In order to unravel the underlying mechanism and search for high quality pressure sensors, a simple object is employed, NaErF 4 @NaLnF 4 (Ln = Y, Lu, Gd) and its Tm 3+ ‐doped derivatives, to comparatively study the effect of interfacial stress on upconversion...