Study on photoluminescence of thermally treated Bi12GeO20 and Mo:Bi12GeO20 crystals

Abstract

Photoluminescence (PL) of Bi 12 GeO 20 and Mo doped Bi 12 GeO 20 (Mo: Bi 12 GeO 20 ) crystals in visible and near-infrared (NIR) spectral regions were studied. X-ray diffraction analysis, absorption and Raman scattering spectra of these crystals were also measured. Pure Bi 12 GeO 20 after annealing in N 2 atmosphere at 450 ºC and 550 °C show predominant emissions at about 745 and 1250 nm bands, while the emission peaks of Mo:Bi 12 GeO 20 crystals untreated or after annealing in Ar at 300 °C are at around 538 and 1165 nm. The results suggest that annealing induces intrinsic luminescence of Bi in pure Bi 12 GeO 20 at room temperature and Mo influences the luminescence centers of Bi 12 GeO 20.

Near infrared luminescence of bismuth-doped MO-B2O3 (M=Ca, Sr, Ba) glasses

“…NIR luminescence with FWHM only 40 nm together with multiple emission peaks can be observed in BaB 1-1 sample in the present work, while one emission with superbroadband FWHM is observed in the other samples and in previous reports. The narrow near infrared fluorescence in Bi-doped materials was reported in the other works of our team [38,39] .…”

Origin of near-IR luminescence in Bi_2O_3–GeO_2 and Bi_2O_3–SiO_2 glasses: first-principle study

“…In conclusion, the results of our modeling of BiODCs in Bi 2 O 3 -GeO 2 and Bi 2 O 3 -SiO 2 hosts make it reasonable to suggest that the luminescence in the 1.2-1.3 µm range in Bi 2 O 3 -GeO 2 glasses [12-14, 16, 19] and crystals [17,18] is caused by = Bi · · · Ge ≡ center, an O vacancy between Bi and Ge atoms ( Fig. 1(a)).…”

Influence of femtosecond pulsed laser irradiation on bismuth germanium oxide single crystal properties

“…Due to its photoconductivity, photochromism, photorefractivity, piezoelectricity, as well as to electro-optic and magneto-optic effects it supports [7,8], Bi 12 GeO 20 is suitable for a broad range of applications and devices such as optical limiting, holography, spatial light modulation, optical phase conjugation, optical memories, fiber optic sensors, Pockels cells [8][9][10][11][12]. The properties of non-doped as well as doped Bi 12 GeO 20 were investigated and reported in a number of studies, for example in [13][14][15][16][17][18][19][20][21]. Characteristics of Bi 12 GeO 20 single crystals after exposure to thermal treatment [16][17][18][19]22], to beams of electrons [23], uranium ions [24], fluorine ions [15], g-ray [19] or light [9,18,22,[25][26][27][28] were investigated.…”

“…The properties of non-doped as well as doped Bi 12 GeO 20 were investigated and reported in a number of studies, for example in [13][14][15][16][17][18][19][20][21]. Characteristics of Bi 12 GeO 20 single crystals after exposure to thermal treatment [16][17][18][19]22], to beams of electrons [23], uranium ions [24], fluorine ions [15], g-ray [19] or light [9,18,22,[25][26][27][28] were investigated. Nonlinear properties of Bi 12 GeO 20 crystals were measured with pulsed laser beams in the nanosecond range in [9], whereas in [26][27][28] BGO crystals were irradiated by picosecond laser pulses.…”

“…Nonlinear properties of Bi 12 GeO 20 crystals were measured with pulsed laser beams in the nanosecond range in [9], whereas in [26][27][28] BGO crystals were irradiated by picosecond laser pulses. Transmission, absorption [16,19], and Raman spectra [19] were found to be significantly influenced by doping and annealing. Thermally stimulated currents as a function of both the temperature at which the crystals are photoexcited and the density of energy used to photoexcite them were reported in [18].…”