Mechanically Induced Light Emission and Infrared-Laser-Induced
Upconversion in the Er-Doped CaZnOS Multifunctional Piezoelectric
Semiconductor for Optical Pressure and Temperature Sensing
posted on 2015-12-17, 00:00authored byHanlu Zhang, Dengfeng Peng, Wei Wang, Lin Dong, Caofeng Pan
In
this study, we report an Er-doped quaternary piezoelectric semiconductor
CaZnOS:Er3+ which shows both mechanoluminescence and upconversion
luminescence properties. Under mechanical stimulation, green light
emission can be observed by the naked eye from a flexible film fabricated
by encapsulating CaZnOS:Er3+ particles between two polyethylene
glycol terephthalate substrates. The integral emission intensity is
proportional to applied pressure, making CaZnOS:Er3+ suitable
for dynamic pressure sensing applications. Moreover, the doped sample
also shows bright visible emission with near-infrared (980 nm) excitation.
The fluorescence intensity ratio between two upconversion emission
bands corresponding to 2H11/2, 4S3/2 → 4I15/2 transitions of Er3+ is sensitive to the variation of temperature. As a multifunctional
optical material, CaZnOS:Er3+ could be used to not only
visualize two-dimensional pressure distribution, through mechanically
induced emission, but also sense temperature via the upconversion
(UC) luminescence. This work provides a novel kind of multifunctional
luminescent material for the development of integrated and coupling
devices.