| Affiliation: | 1. School of Physical Science and Technology, Ningbo University, Ningbo, Zhejiang, 315211 China;2. Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznańskiego 8, Poznań, 61–614 Poland;3. Departamento de Física, Instituto de Materiales y Nanotecnología, IUdEA & MALTA Consolider Team, Universidad de La Laguna, Apdo. Correos 456, San Cristóbal de La Laguna, Santa Cruz de Tenerife, E-38200 Spain
Department of Physics, Pukyong National University, Busan, 608–737 Republic of Korea;4. Departamento de Física, Instituto de Materiales y Nanotecnología, IUdEA & MALTA Consolider Team, Universidad de La Laguna, Apdo. Correos 456, San Cristóbal de La Laguna, Santa Cruz de Tenerife, E-38200 Spain |
| Abstract: | To address the unsatisfactory pressure sensitivity of luminescent manometers, Eu2+-activated supersensitive microspheres operating in the visible range are developed. A series of Eu2+-doped Sr8Si4O12Cl8 materials are synthesized as microspheres, and their structural and spectroscopic properties are studied theoretically and experimentally. Excited at 350 nm, the samples emit a bright cyan luminescence at ambient conditions that, upon pressure, changes to green emission and finally to yellow light above 7 GPa. Most importantly, a huge red-shift of the emission band from 497.3 to 568.8 nm is observed as the pressure increases, leading to an ultrahigh-pressure sensitivity of 9.69 nm/GPa, which is the highest sensitivity ever reported. The designed microspheres with polychromatic emissions and high-pressure sensitivity are suitable for visual optical pressure sensing, and the applied strategy provides some important guidelines for the development of new optical manometers, allowing pressure monitoring with unprecedented accuracy. |
