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Farida A. Selim, Washington State University, DMR 1006772

Role of Hidden Hydrogen on the Optical Properties of Complex Oxides. Farida A. Selim, Washington State University, DMR 1006772.

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Farida A. Selim, Washington State University, DMR 1006772

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  1. Role of Hidden Hydrogen on the Optical Properties of Complex Oxides Farida A. Selim, Washington State University, DMR 1006772 Hydrogen impurities have been often studied in semiconductors and their role on the electrical properties has been recognized. However the presence and effect of hydrogen in insulating materials has been ignored. The current study on the complex oxide of yttrium aluminum oxide revealed that hydrogen plays an important role on the optical and photonic properties of insulating oxides. Thermo-luminescence measurements shown in the figure indicated the role of H as a shallow trap, which affects the time decay of scintillation signal. Positron lifetime measurements showed that these H atoms fill cation vacancies, thus revealing an interesting mechanism for charge compensation in the defect physics of oxides. O The peak at -50 C represents a shallow trap in Ce doped YAG crystals with activation energy of 0.7 eV. It leads to delayed luminescence signal and greatly influences the scintillation features. Hydrogen impurities have been found to be responsible for these shallow traps. D. T. Mackay, C. R. Varney, J. Buscher, and F. A. Selim, J . Appl. Phys. 112, 023522, 2012.

  2. Participation of Graduate, Undergraduate and high School Students in DMR Research Farida A. Selim, Washington State University, DMR1006772 DMR-1006772 project at Washington State University engages graduate, undergraduate and high school students in high quality interesting physics and materials research. Graduate students are showing great leadership in training undergraduate and high school students and extraordinary commitment in developing new instrumentation to advance their research. They have developed and built a new x-ray luminescence spectrometer to advance the study of photonic materials. After one year intership in our laboratory at WSU, Fredrick Chen- high school student-was able to compete with WSU students and to win a top honor award at SURCA (Showcase for Undergraduate Research and Creative Activities). http://universitycollege.wsu.edu/units/undergraduateresearch/SURCA/awards2012/ Graduate student Ji Jianfeng (right) teaches undergraduate student Kim Heiner (middle) and high school student Autumn Pratt (left) how to grow high quality optical films by spin coating. High School student Fredrick Chen competed with WSU students and won the top award in “Early Carrier Research” in March 2012 in SURCA event at WSU. Graduate Chris Varney, Amin Khamehchi and Ji Jianfeng are celebrating the completion of their new spectrometer. They have developed and built a new unique x-ray luminescence spectrometer to advance the study of the scintillation and optical properties of YAG and other photonic materials.

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