Optical Sensing Properties Of Luminescent Ions Doped Piezoelectric Semiconductor Materials

Luminescent ions doped functional materials have interesting and fascinating physical and chemical properties.They can respond to acoustic,optical,electrical,magnetic,thermal,and chemical stimuli and generate specific optical signals that can be resolved.Thus,they are also known as smart luminescent materials.This property makes them promising in the fields of biomedicine,sensing detection and advanced industrial manufacturing.Herein,lanthanide ions and transition metal ions were selected as activators,and wide bandgap quaternary piezoelectric semiconductor was used as the host material to successfully synthesize a series of smart lght-emitting materials with multi-stimuli responses.The multimodal luminescence properties of these smart luminescent materials and the temperature and stress sensing properties are systematically investigated.In order to develop high-sensitive temperature detection and low-pressure threshold mechanical sensing materials,Mn²⁺/Er³⁺co-doped MZn OS（M=Ca,Sr,Ba）micro-crystallites were fabricated through a high-temperature solid-state reaction.They can respond to UV,NIR and stress simultaneously and exhibit completely different optical properties.In particular,flexible composite films and rigid composite blocks for mechanical-to-optical energy conversion were prepared by mixing sample particles and high molecular polymers（polydimethylsiloxane,epoxy resin）.The developed composites can be used for visualization of stress distribution,E-signature and anti-counterfeiting systems.Furthermore,the results show that the synthesized samples have excellent temperature sensing performance based on their upconversion luminescence.In view of the development needs of optical stress/strain sensing devices with high anti-interference ability,layered Sr Zn OS:Yb³⁺/Er³⁺,Sr Zn OS:Yb³⁺and Sr Zn OS:Er³⁺microcrystals were prepared by controllable high temperature solid state reaction.Through the introduction of rare earth ion Yb³⁺,the photon emission range of the sample is expanded,especially the mechanoluminescence covering the visible to near-infrared spectrum is realized.Near-infrared stress luminescence can effectively resist the interference of ambient light,which is of great significance for the development of optical stress/strain sensing devices with high anti-interference.Due to its multifunctional optical properties,multimodal light emission is achieved under various stimulation/excitation sources（UV,NIR laser,X-ray,and force）,and optical stress is achieved by establishing a quantitative mathematical relationship between force and light conversion sensing.In addition,the temperature detection performance and power-dependent color tunability of the samples were also evaluated.The results show that the developed smart luminescent material has multimode luminescence properties,enabling real-time accurate measurement of temperature and stress,visualization of stress distribution,and regulation of upconversion luminescence color,which can be used in advanced optical sensors and anti-counterfeiting applications.