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Sensors 2011, 11(4), 3962-3969; doi:10.3390/s110403962

Communication

Novel Mechano-Luminescent Sensors Based on Piezoelectric/Electroluminescent Composites

Yanmin Jia ^1,* , Xiangling Tian ¹ , Zheng Wu ^2,3 , Xiaojuan Tian ¹ , Jiayi Zhou ¹ , Yunzhang Fang ¹  and Chenchen Zhu ⁴

¹ Department of Physics, Zhejiang Normal University, Jinhua, 321004, China ² College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, China ³ School of Materials Science and Technology, China University of Geosciences, Beijing, 100083, China ⁴ ACCIS Group, Aerospace Engineering, Faculty of Engineering, University of Bristol, Tyndall Avenue, Bristol BS8 1TH, UK

* Author to whom correspondence should be addressed.

Received: 21 February 2011; in revised form: 17 March 2011 / Accepted: 31 March 2011 / Published: 1 April 2011

(This article belongs to the Section Physical Sensors)

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Abstract: A high-sensitivity mechano-luminescent sensor was fabricated on the basis of piezoelectric/electroluminescent composites. The working principle of this mechano-luminescent sensor was elucidated by analyzing the relationship between the piezoelectric-induced charges and the electroluminescent effects. When a stress is applied on the piezoelectric layer, electrical charges will be induced at both the top and bottom sides of the piezoelectric layer. The induced electrical charges will lead to a light output from the electroluminescent layer, thus producing a mechano-luminescence effect. By increasing the vibration strength or frequency applied, the mechano-luminescence output can be obviously enhanced. Mechano-luminescence sensors have potential in smart stress-to-light devices, such as foot-stress-distribution-diagnosis systems and dynamic-load-monitors for bridge hanging cables.

Keywords: piezoelectric; mechano-luminescent sensors; composites

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