Oxygen-assisted preparation of mechanoluminescent ZnS:Mn for dynamic pressure mapping
oxygen assistance, piezo-photonic effect, pressure mapping, ZnS:Mn
ABSTRACT Mechanoluminescent materials that convert mechanical stimuli to light emission have attracted extensive attention for potential applications in human–machine interactions. Here, we report a simple and available novel approach for the oxygen-assisted preparation of ZnS:Mn particles by solid-state reaction at atmospheric pressure without the formation of the corresponding oxides. The existence of O2 has a positive impact on the formation of S vacancies in wurtzite-phase ZnS, leading to the introduction of Mn2+ ion luminescent centers and shallow donor levels, which can improve the electron–hole recombination rate. The O2 ratio and Mn2+ ion doping concentration have significant effects on the luminous efficiency, which is optimal at 1%–20% and 1 at.%–2 at.% respectively. In addition, a device based on the piezo-photonic effect with excellent pressure sensitivity of 0.032 MPa–1 was fabricated, which can map the two-dimensional pressure distribution ranging from 2.2 to 40.6 MPa in situ. This device can be applied to real-time pressure mapping, smart sensor networks, high-level security systems, human-machine interfaces, and artificial skins.
Tsinghua University Press
Xiandi Wang,Rui Ling,Yufei Zhang,Miaoling Que,Yiyao Peng,Caofeng Pan, Oxygen-assisted preparation of mechanoluminescent ZnS:Mn for dynamic pressure mapping. NanoRes.2018, 11(4): 1967–1976