Photoluminescence spectroscopy of Cr3+ in β-Ga2O3 and (Al0.1Ga0.9)2O3

Remple, Cassandra; Barmore, Lauren M.; Jesenovec, Jani; McCloy, John S.; McCluskey, Matthew D.

doi:10.1116/6.0002340

Photoluminescence spectroscopy of Cr³⁺ in β-Ga₂O₃ and (Al_0.1Ga_0.9)₂O₃

Journal Article · Fri Jan 27 00:00:00 EST 2023 · Journal of Vacuum Science and Technology A

DOI:https://doi.org/10.1116/6.0002340· OSTI ID:1924546

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Washington State Univ., Pullman, WA (United States); Institute for Shock Physics, Washington State University
Washington State Univ., Pullman, WA (United States)

Alloying β-Ga₂O₃ with Al₂O₃ to create (Al_xGa_1–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-(Al_0.1Ga_0.9)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). Here, 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.

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Research Organization:: Washington State Univ., Pullman, WA (United States); Washington State University, Pullman, WA (United States). Inst. for Shock Physics

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-07ER46386; NA0003957

OSTI ID:: 1924546

Alternate ID(s):: OSTI ID: 1922570
OSTI ID: 1958028

Journal Information:: Journal of Vacuum Science and Technology A, Journal Name: Journal of Vacuum Science and Technology A Journal Issue: 2 Vol. 41; ISSN 0734-2101

Publisher:: American Vacuum Society / AIPCopyright Statement

Country of Publication:: United States

Language:: English

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