Specific Features of Spectrally Resolved Thermoluminescence in UV-Irradiated Aluminum Nitride Microcrystals

Spiridonov, D. M.; Chaikin, D. V.; Martemyanov, N. A.; Вохминцев, А. С.; Weinstein, I. A.

doi:10.1134/s0030400x20090210

Opt. Spectrosc.

2020

DOI: 10.1134/s0030400x20090210

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Specific Features of Spectrally Resolved Thermoluminescence in UV-Irradiated Aluminum Nitride Microcrystals

D. M. Spiridonov

D. V. Chaikin

N. A. Martemyanov

et al.

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2021

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“…The processes of restoration can promote emission/luminescence (arrows E Res (D1) and E Res (D2)) at energies even higher than the optical excitation energy. We suggest that such emission was observed by Okada et al after X-Ray/UV irradiation of AlN ceramic samples[51][52][53] or by Spiridonov et al after UV irradiation of high-oxygen AlN 54. Below we discuss the absorption bands appearing after the UV irradiation in area B2.…”

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Photochromism and influence of point defect charge states on optical absorption in aluminum nitride (AlN)

Gamov

Hartmann

Straubinger

et al. 2021

Journal of Applied Physics

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In this work, we study the absorption properties of AlN in the range of 1.5 -5.5 eV, as well as the meta-stable change in absorption induced by ultraviolet (UV) irradiation (photochromism), and the restoration of the initial state under the action of irradiation of 2 -4 eV or elevated temperatures. UV irradiation results in a decrease of the absorption coefficient from 110 cm -1 to 55 cm -1 at 4.7 eV while in the visible range the absorption coefficient increases from values below 5 cm -1 to ~35 cm -1 . Measurements with two linear polarizations, E∥c and E⊥c, provide determination of several different absorption bands at 2. 6, 2.8, 3.4, 4.0, 4.5, and 4.8 eV. The bands at 2.6 eV and 3.4 eV identify the defect levels near to the valence band, while the band peaking at 2.8 eV is related to the conduction band. The photochromism allows controlling the absorption of light in two related spectral ranges because the decrease of UV absorption and increase of the visible absorption are related to switching the charge state of the same defects.

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Photochromism and influence of point defect charge states on optical absorption in aluminum nitride (AlN)

Gamov

Hartmann

Straubinger

et al. 2021

Journal of Applied Physics

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UV light induced processes in pure and doped AlN ceramics

et al. 2021

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Specific Features of Spectrally Resolved Thermoluminescence in UV-Irradiated Aluminum Nitride Microcrystals

Cited by 2 publications

References 38 publications

Photochromism and influence of point defect charge states on optical absorption in aluminum nitride (AlN)

Photochromism and influence of point defect charge states on optical absorption in aluminum nitride (AlN)

UV light induced processes in pure and doped AlN ceramics

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