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Mccluskey, Matthew
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Topics
Publications (10/10 displayed)
- 2023Photoluminescence of Cr3+ in β-Ga2O3 and (Al0.1Ga0.9)2O3 under pressurecitations
- 2023Room-Temperature Persistent Photoconductivity in Barium Calcium Titanatecitations
- 2023Photoluminescence spectroscopy of Cr3+ in β-Ga2O3 and (Al0.1Ga0.9)2O3citations
- 2022Growth and defect characterization of doped and undoped β-Ga2O3 crystalscitations
- 2015Large Persistent Photoconductivity in Strontium Titanate at Room Temperaturecitations
- 2014Persistent Photoconductivity in Bulk Strontium Titanate
- 2009Dopants in nanoscale ZnO
- 2005Infrared Spectroscopy of Impurities in ZnO Nanoparticlescitations
- 2005Hydrogen Donors in ZnOcitations
- 2004Infrared Spectroscopy of Hydrogen in ZnOcitations
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article
Photoluminescence spectroscopy of Cr3+ in β-Ga2O3 and (Al0.1Ga0.9)2O3
Abstract
<jats:p>Alloying β-Ga2O3 with Al2O3 to create (AlxGa1−x)2O3 enables ultra-wide bandgap materials suitable for applications deep into ultraviolet. In this work, photoluminescence (PL) spectra of Cr3+ were investigated in monoclinic single crystal β-Ga2O3, and 10 mol. % Al2O3 alloyed with β-Ga2O3, denoted β-(Al0.1Ga0.9)2O3 or AGO. Temperature-dependent PL properties were studied for Cr3+ in AGO and β-Ga2O3 from 295 to 16 K. For both materials at room temperature, the red-line emission doublet R1 and R2 occurs at 696 nm (1.78 eV) and 690 nm (1.80 eV), respectively, along with a broad emission band at 709 nm (1.75 eV). The linewidths for AGO are larger for all temperatures due to alloy broadening. For both materials, the R-lines blue-shift with decreasing temperature. The (lowest energy) R1 line is dominant at low temperatures due to the thermal population of the levels. For temperatures above ∼50 K, however, the ratio of R2 to R1 peak areas is dominated by nonradiative combination.</jats:p>