Incident wavelength and polarization dependence of spectral shifts in β-Ga2O3 UV photoluminescence

Wang, Yunshan; Dickens, Peter T.; Varley, Joel B.; Ni, Xiaojuan; Lotubai, Emmanuel; Sprawls, Samuel; Liu, Feng; Lordi, Vincenzo; Krishnamoorthy, Sriram; Blair, Steve; Lynn, Kelvin G.; Scarpulla, Michael; Sensale-Rodriguez, Berardi

doi:10.1038/s41598-018-36676-7

Incident wavelength and polarization dependence of spectral shifts in β-Ga2O3 UV photoluminescence

Journal Article · Mon Dec 24 00:00:00 EST 2018 · Scientific Reports

DOI:https://doi.org/10.1038/s41598-018-36676-7· OSTI ID:1619565

Wang, Yunshan; Dickens, Peter T.; Varley, Joel B.; Ni, Xiaojuan; Lotubai, Emmanuel; Sprawls, Samuel; Liu, Feng; Lordi, Vincenzo; ; Blair, Steve; ; Scarpulla, Michael; Sensale-Rodriguez, Berardi

Abstract

We report polarization dependent photoluminescence studies on unintentionally-, Mg-, and Ca-doped β -Ga ₂ O ₃ bulk crystals grown by the Czochralski method. In particular, we observe a wavelength shift of the highest-energy UV emission which is dependent on the pump photon energy and polarization. For 240 nm (5.17 eV) excitation almost no shift of the UV emission is observed between E || b and E || c , while a shift of the UV emission centroid is clearly observed for 266 nm (4.66 eV), a photon energy lying between the band absorption onsets for the two polarizations. These results are consistent with UV emission originating from transitions between conduction band electrons and two differentially-populated self-trapped hole (STH) states. Calcuations based on hybrid and self-interaction-corrected density functional theories further validate that the polarization dependence is consistent with the relative stability of two STHs. This observation implies that the STHs form primarily at the oxygen atoms involved in the original photon absorption event, thus providing the connection between incident polarization and emission wavelength. The data imposes a lower bound on the energy separation between the self-trapped hole states of ~70–160 meV, which is supported by the calculations.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Advanced Manufacturing Office (EE-5A); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC52-07NA27344; FG02-04ER46148

OSTI ID:: 1619565

Alternate ID(s):: OSTI ID: 1497971

Report Number(s):: LLNL-JRNL--760987; 18075; PII: 36676

Journal Information:: Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 8; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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