Hydrogen in Insulating Oxides
ORAL
Abstract
Hydrogen is known to strongly affect the structural and electrical properties of many materials. Its effects have been extensively investigated in semiconductors, theoretically and experimentally. However, no attention has been paid to the role of hydrogen in insulators. In this work we show that hydrogen has profound effects on the optical properties of Y$_{3}$Al$_{5}$O$_{12}$ insulating oxide, an important photonic material with wide range of applications in laser, scintillation and illumination. Thermo-luminescence measurements were carried out from 77 K-675 K on undoped Y$_{3}$Al$_{5}$O$_{12}$ single crystals. The measurements showed that hydrogen eliminates most of the deep and shallow traps in Y$_{3}$Al$_{5}$O$_{12}$ single crystals and dramatically affect the luminescence and scintillation properties of the crystals. These effects are explained due to the recently discovered phenomena, passivation of cation vacancies by hydrogen [Phys. Rev. B 88, 174102, 2013].
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Authors
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David Winarski
Bowling Green State University
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Zachary Richards
Washington State University, Department of Physics, Bowling Green State University, 104 Overman Hall, OH 43403, USA, Nuclear Radiation Center, PO Box 641300, Washington State University, Pullman, WA 99164-1300, USA, Institute of Nuclear and Physical Engineering, Slovak University of Technology in Bratislava, Ilkovi\v{c}ova 3, 812 19 Bratislava, Slovak Republic, Air Force Institute of Technology, Oak Ridge Institute of Science and Education, Bowling Green State University, Department of Chemistry and Biochemistry, Southern Illinois University, Purdue University, University of Toledo