Thermoluminescence and annealing of F-centres in KCl gamma irradiated at room temperature

Ausin, V; Rivas, J L Alvarez

doi:10.1088/0022-3719/5/1/011

Cited by 107 publications

(15 citation statements)

References 29 publications

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“…Since the impurity does not take part in the process of emission, these hole-type centres may be responsible for this emission. I n this regard Ausin and Alvarez-Rivas [18] attributed the 420 nm emission band to be due to radiative annihilation of interstitial halogen atoms thermally released from traps. Similarly Akasaka et al have reported emission bands a t 360,425, and 510 nm which have been attributed to trapped hole centres.…”

Section: Discussionmentioning

confidence: 99%

Thermoliiminescence Emission and Decay Kinetics of NaCl:SnCl2 Single Crystals

Acharya

Mukherjee

Sunta

et al. 1984

Phys. Stat. Sol. (a)

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The thermoluminescence (TL) and emission spectra of γ‐irradiated NaCl :Sn single crystals are studied in the temperature range of 30 to 300°C. The glow curve shows two prominent glow peaks around 125 and 187 °C, besides a shoulder around 100 °C. F‐bleaching and photostimulation of the γ‐irradiated sample decrease the 187 °C glow peak and enhances the intensity of the 125 °C peak; besides, a new peak at 68 °C develops. The TL emission spectra around the two prominent glow peaks show two emission bands at 430 and 510 nm. The optical absorption spectra show a band arround 220 nm besides the F‐band at 460 nm in γ‐irradiated samples. The 220 nm band increases after F‐bleaching. From these observations the 125 °C glow peak is tentatively attributed to Sn+ centres. The isothermal and photostimulated decay of luminescence at various temperatures is recorded. The decay kinetics for different glow peaks are determined using the new method of Simon and Tam and the values of trap depths so obtained are compared with the values obtained by other methods. The trap depths are found to be 1.03, 1.16, 1.27, and 1.51 eV for the 68, 100, 125, and 187 °C glow peaks, respectively. It is shown that although addition of tin impurity into NaCl introduces shallow traps, but it does not take part in the emission process.

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Section: Discussionmentioning

confidence: 99%

Thermoliiminescence Emission and Decay Kinetics of NaCl:SnCl2 Single Crystals

Acharya

Mukherjee

Sunta

et al. 1984

Phys. Stat. Sol. (a)

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“…The background follows all TL-peaks exept the peaks corresponding to n = 9, 10 (E = 1:064, 1.178 eV). It is believed that failure to take the background into account had led to very understated energy values and, correspondingly, frequency factors obtained by the isothermal light{decay curves method [20,21]. It is clear that errors connected with the thermocouple calibration, temperature gradients etc.…”

Section: On the Fractional Curve Glowing Methodmentioning

confidence: 99%

“…According to the most advanced of them, the mechanism of the TL is governed by: 1) the recombination of electrons (released from F centers and other defects) with holes at luminescence centers [11 to 13] or with double holes centers [14]; 2) F centers are the recombination centers for holes which are thermally released from traps [15,16]; 3) the release of holes (V k centers) and interstitials (H centers) trapped together in the form of Cl ¡ 3 ion followed by recombination [17 to 19]; 4) the recombination with F centers of halogen interstitial atoms (stabilized by di®erent defects) which are thermally released from traps (the ion model [20,21]). This model seems to be more convincing for the case of NaCl.…”

Section: On the Tl Mechanism In Naclmentioning

confidence: 99%

“…Unfortunately, we have not found current investigations devoted to the study of the role of oxygen in the TL of NaCl crystals, but a recent study [24] dealt with the in°uence of oxygen centers on the TL of NaF crystals, where it was reported that oxygen centers (mostly O 2¡ v + a complexes) can stabilize interstitial halogen atoms (H centres). This is important, in particular, for the ion model of Alvarez Rivaz et al [20,21].…”

Section: ¡1mentioning

confidence: 99%

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Oscillator rule of the trap activation energies in NaCl crystals

Gumenjuk

Kutovyi

2003

Open Physics

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Abstract:The energy spectra of traps in NaCl crystals have been studied in detail by the method of thermoluminescence. Crystals of NaCl were undoped but treated thermally in di¬erent ways. The activation energies of traps form a single oscillator series,¡1 . Contrary to other previously studied crystals with complex lattices, the corresponding line · h! Ram = · h! T L was not found in Raman spectra of NaCl. It is assumed that the oscillator rule is governed by the polaron nature of traps. The trap activation energy is determined by the vibration level from which the transition of the charge carrier to the excited luminescence centre is made possible and depends on the distance between these centres.

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Luminescence and Structural Properties on Sm3+ Doped KBR Single Crystals

2017

IJAERD

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KBr (pure as well as doped with suitable impurities) is probably the most extensively studied of the alkali halides [1][2][3] . Recent years more efforts have been made for the development of rare earth ions activated luminescent materials for their wide range of potential application in optoelectronic devices, temperature sensors, so lid state lighting, optical communication system and luminescent probes [4][5][6][7][8][9] . Samarium is an active ion for different inorganic host lattice and act as a powerful emitting centre due to its energy level structure and high luminescence efficiency [10] . The large ionic radius of potassium ions permits incorporation of a large number of cationic impurities. The sites of dopants determined by their ionic radii. The radii of Sm 3+ are 0.958. Most of the work has been done in samarium doped materials as powder and glasses [11][12][13] . In the present work Sm 3+ doped KBr crystals has been grown by Bridgeman Stockbarger technique and the grown crystals were characterized by Fourier Transform Infrared (FTIR), X-Ray Diffraction method(XRD), Scanning Electron Microscopy(SEM), Electron Paramagnetic Resonance(EPR). ExperimentalSingle crystals of Samarium doped KBr (99.99% purity) were grown using Bridgemann Stockbarger technique. Samarium was added in the form of Samarium fluoride (Aldrich 99.99% purity). The crystal grown with three different impurity concentrations 1%, 3% and 5% by weight. The results due to three concentrations were similar except high luminescence yield for crystals with a high concentration. Hence only the results pertaining to Samarium concentration of 5% by weight are presented and discussed. All the measurements were performed at room temperature. Laser Raman Scattering Spectrum were taken using Reinsaaw Invia spectrometer with red laser. X-ray diffraction spectrum of the prepared sample by using (Rigaku) X-ray diffractometer (CuK α , λ=1.5443Å) at the rate of 2°/min and the variation of 2θ is from 10° to 90°. The morphologies of the samples were inspected using Scanning Electron Microscopy SEM-JEOL-JSM 5610LV model. EPR spectrum were recorded using a EPR spectrometer at microwave frequency (9-10 GHz) at room temperature with a magnetic field modulation of 100 KHz to obtained first derivative EPR signal. Laser Raman ScatteringWe have used red laser as the excitation wavelength to record Raman spectrum. The Raman spectrum obtained at room temperature using the excitation wavelength λ L = 785nm is shown in Fig.1. It composed of three main peaks at 107Cm -

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Thermoluminescence and annealing of F-centres in KCl gamma irradiated at room temperature

Cited by 107 publications

References 29 publications

Thermoliiminescence Emission and Decay Kinetics of NaCl:SnCl2 Single Crystals

Thermoliiminescence Emission and Decay Kinetics of NaCl:SnCl2 Single Crystals

Oscillator rule of the trap activation energies in NaCl crystals

Luminescence and Structural Properties on Sm3+ Doped KBR Single Crystals

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