Optical properties of lithium gallium oxide

Tumėnas, Saulius; Mackonis, Paulius; Nedzinskas, Ramūnas; Trinkler, L.; Bērziņa, B.; Korsaks, V.; Chang, Liuwen; Chou, Mitch M. C.

doi:10.1016/j.apsusc.2017.01.098

Cited by 16 publications

(17 citation statements)

References 24 publications

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“…6. Comparison of the obtained photoconductivity spectrum with the ab-sorption spectrum [3] and the excitation spectra (PLE) of the photo-luminescence [13] PLE bands of 280 nm and 340 nm (obtained using inter-ference filters), as well as with the afterglow creation spectrum. Good agreement is observed between the photoconductivity spectra and the after-glow creation spectra.…”

Section: Resultsmentioning

confidence: 99%

“…It is seen that in the area of the intrinsic absorption band at 6.06 eV (this band absorption coefficient is calculated from the measurements of n and k performed in Ref. [3], where details of this band property could be found).…”

Section: Resultsmentioning

confidence: 99%

“…direct ones. [3] by the method of ellipsometry. The existence of a relatively sharp Gudden and Pohl [6] (see also [7]) were pioneers in the study of absorption band at 6 eV with position of maximum as a function of light photoconductivity in insulators.…”

Section: Introductionmentioning

confidence: 99%

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Photoconductivity & photoelectron emission of LiGaO2 crystal excited in intrinsic absorption range

Trukhin

Trinkler

2019

Optical Materials

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The photoelectric response spectra were studied in a LiGaO2 crystal. The obtained spectra were interpreted as the release and diffusion of charge carriers, as well as external photoemission of electrons. The charge carrier release starts from excitation with a photon with energy greater than the optical gap of the LiGaO2 crystal (∼6 eV). The efficiency of generation of charge carriers exponentially increases up to 8 eV with saturation beginning from 9 eV. The nature of the photoelectric response is attributed to the Dember effect corresponding to the higher mobility of electrons compared to holes. The low yield of the internal photoelectron in the range of the intrinsic absorption band at 6 eV is associated with its exciton nature. Above 9.5-10 eV, an additional response was revealed that was interpreted as external photoelectron emission with a threshold of about Eth = 10.1 ± 0.2 eV. The relative emission yield of electrons increases as (hν-Eth) 3 , which corresponds to indirect transitions between the valence and conduction bands. The emission of photoelectrons for the direct band-to-band transitions increases linearly with the photon energy and the corresponding threshold is defined as 12.7 ± 0.2 eV.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Photoconductivity & photoelectron emission of LiGaO2 crystal excited in intrinsic absorption range

Trukhin

Trinkler

2019

Optical Materials

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“…The presence of the 280 nm band in XL afterglow and TL emission spectrum gave an additional argument for the recombination nature of this luminescence band. LGO crystal optical absorption at RT (1) [1,3], PL at laser excitation 193 nm (2) and 248 nm (3); PLE of 280 nm emission (4) and 330 nm emission (5).…”

Section: Photoluminescence and Tl Of Lgomentioning

confidence: 99%

“…Recently we have studied luminescence properties of the wide band gap crystal lithium metagallate LiGaO 2 (LGO) (optical gap around 6 eV [1]) grown by authors of [2] and found out that the main emission bands are located at 280 and 330 nm, (4.43 and 3.76 eV), correspondingly, see Fig.1. [3].…”

Section: Introductionmentioning

confidence: 99%

Comparison of Luminescence in LiGaO₂, Al₂O₃-Ga and Al₂O₃-Li Crystals

Trinkler

Trukhin

Chou

2018

Latvian Journal of Physics and Technical Sciences

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We have studied luminescence of LiGaO2, Al2O3-Ga and Al2O3-Li crystals in order to reveal the nature of luminescence centres and mechanisms in these crystals. In Al2O3-Ga presence of Ga impurities determines occurrence of the 280 nm emission band, which demonstrates intra-centre character in photoluminescence and recombination character under X-ray irradiation. In Al2O3-Li crystal lithium induced luminescence is presented with the 326 nm band, which has a recombination character. Basing on spectral similarity of the main luminescence bands in pure LiGaO2 crystal with the dopant-induced emission bands in Al2O3, and on peculiarities of the X-ray induced thermoluminescence, the adjustment of the previous luminescence interpretation is done. It is proposed that the donor-acceptor pairs with random separation distribution responsible for the 280 nm emission are represented with gallium Ga (plus an electron) and O (plus a hole) pairs, while the donor-acceptor pairs, producing the 330 nm emission band contain a lithium ion, presumably in the interstitial position Lii0, and a neighbouring oxygen ion with a caught hole.

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Structural characterization &, optical and electrical properties of LiGaO2 & LiGa5O8 micro-nanoparticles-based photodetectors

Wang

Jiang

Song

et al. 2021

Journal of Alloys and Compounds

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Optical properties of lithium gallium oxide

Cited by 16 publications

References 24 publications

Photoconductivity & photoelectron emission of LiGaO2 crystal excited in intrinsic absorption range

Photoconductivity & photoelectron emission of LiGaO2 crystal excited in intrinsic absorption range

Comparison of Luminescence in LiGaO₂, Al₂O₃-Ga and Al₂O₃-Li Crystals

Structural characterization &, optical and electrical properties of LiGaO2 & LiGa5O8 micro-nanoparticles-based photodetectors

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Optical properties of lithium gallium oxide

Cited by 16 publications

References 24 publications

Photoconductivity & photoelectron emission of LiGaO2 crystal excited in intrinsic absorption range

Photoconductivity & photoelectron emission of LiGaO2 crystal excited in intrinsic absorption range

Comparison of Luminescence in LiGaO2, Al2O3-Ga and Al2O3-Li Crystals

Structural characterization &, optical and electrical properties of LiGaO2 & LiGa5O8 micro-nanoparticles-based photodetectors

Contact Info

Product

Resources

About

Comparison of Luminescence in LiGaO₂, Al₂O₃-Ga and Al₂O₃-Li Crystals