title: Triboluminescence dominated by crystallographic orientation.
abstract: Triboluminescence (TL) is an optical phenomenon that has a long and varied history with broad applications, such as damage detection, X-ray source, and mass health monitoring sensor. So far, the properties and mechanisms of TL remain not completely understood. The TL properties emitted during the sliding contact between Al2O3 and SiO2 surfaces were studied along different crystallographic orientations. In this study, the TL intensity of Al2O3 was significantly enhanced as Al2O3 surface was along a particular crystallographic orientation, which is an unconventional phenomenon. TL enhancement of Al2O3 was not affected by air atmosphere and atomic stocking mode of Al2O3. The enhancement mechanism of Al2O3 may be influenced by the surface state of Al2O3. This work provides a new method to control the intensity of TL and novel ideas to elucidate the TL mechanism.
authors.affiliation: State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China.
authors.forename: Kuifang
authors.initials: K
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China.
authors.forename: Liran
authors.initials: L
authors.lastname: Ma
authors.affiliation: School of Technology, Beijing Forestry University, Beijing 100083, China.
authors.forename: Xuefeng
authors.initials: X
authors.lastname: Xu
authors.affiliation: State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China.
authors.forename: Shizhu
authors.initials: S
authors.lastname: Wen
authors.affiliation: State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China.
authors.forename: Jianbin
authors.initials: J
authors.lastname: Luo