Effect of doping on the luminescence properties of Li2B4O7

Huy, Bui The; Quang, Vu Xuan; Chau, H.T.B.

doi:10.1016/j.jlumin.2008.03.007

Cited by 39 publications

(21 citation statements)

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“…This allows a few of the electrons and holes to become "trapped" at widely separated sites in the crystal and form the observed stable paramagnetic point defects. The following results show that Ag ions act as both electron and hole traps in Ag-doped Li 2 Two holelike centers are formed in the Ag-doped Li 2 B 4 O 7 crystal during the x-ray irradiation at room-temperature. Ag nuclei are not resolved in the EPR spectra, and only a pair of lines separated by the averaged hyperfine splitting is observed for each holelike center.…”

Section: Resultsmentioning

confidence: 78%

“…This spectrum is assigned to a trapped electron shared between an interstitial Ag ion and the substitutional I ¼ 3/2 ion. Upon warming, the radiation-induced trapped electrons and holes seen with EPR recombine between 100 and 200 C, in agreement with a single strong TL peak observed near 160 C. [1][2][3][4][5][6] Large high-quality single crystals with controlled doping can be readily grown and their impurity-related radiative processes can be extremely efficient. [7][8][9][10][11][12][13] Another important feature of Li 2 B 4 O 7 crystals is the presence of two isotopes ( 6 Li and 10 B) with large cross-sections for thermal neutron capture.…”

mentioning

confidence: 57%

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Electron and hole traps in Ag-doped lithium tetraborate (Li2B4O7) crystals

Brant

Kananan

Murari

et al. 2011

Journal of Applied Physics

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Section: Resultsmentioning

confidence: 78%

mentioning

confidence: 57%

Electron and hole traps in Ag-doped lithium tetraborate (Li2B4O7) crystals

Brant

Kananan

Murari

et al. 2011

Journal of Applied Physics

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“…The majority of previous studies have been focused on the photoluminescence (PL), thermoluminescence and dosimetric properties of various starting materials (copper, silver, magnesium or any combination of these dopants) doped Li 2 B 4 O 7 (El-Faramawy et al, 2000a, b;Huy et al, 2008;Prokic, 2001;Manam and Das, 2010;Laksmanan et al, 1981;Annalakshmi et al, 2011;Doull et al, 2013;Pekpak et al, 2011;Patra et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

TL/OSL studies of Li2B4O7:Cu dosimetric phosphors

Aydın

Demirtaş

Aydın

2013

Radiation Measurements

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h i g h l i g h t sLi 2 B 4 O 7 :Cu as a personal dosimetry was firstly investigated by OSL techniques. Prepared phosphor has good OSL repeatability. Beta dose can be determined with less than 3e4% error by using OSL technique. This is the first study on dose measurement of Li 2 B 4 O 7 :Cu using OSL technique. a b s t r a c t Dosimetric phosphors of Cu-doped lithium tetraborate (Li 2 B 4 O 7 :Cu) were produced using a sintering technique in a laboratory environment and characterized using Scanning Electron Microscopy (SEM) and X-ray Diffractometry (XRD). The thermoluminescence (TL) and optically stimulated luminescence (OSL) properties of powdered (Li 2 B 4 O 7 ) phosphor doped with copper at different concentrations (0.020 e0.025 wt %) were studied. The Cu-doped Li 2 B 4 O 7 phosphor material has two dominant TL glow peaks, and the maximum TL responses of the peaks are at 115 C and 243 C in the range of 0 Ce310 C. The TL response of the Cu-doped lithium tetraborate is approximately 900 times more sensitive than undoped lithium tetraborate. The TL and OSL signal intensities increase as the beta radiation doses increase up to approximately 150.00 Gy and 76.50 Gy, respectively. The OSL doseeresponse curve is linear up to a dose range of 12.00 Gy for Cu-doped Li 2 B 4 O 7 dosimetric phosphors. The time-dependent fading behavior of the Cu-doped lithium tetraborate was found to be quite stable over long time durations. In addition, the repeatability of the OSL dose measurements were determined to be 2/3 lower compared to the TL measurements. The reproducibility of the OSL measurements was approximately 5%. Based on the TL and OSL results, the prepared phosphors can be used to measure beta doses ranging from 10 mGy to 150.00 Gy and 76.50 Gy, respectively, by using the TL and OSL techniques, with confidence limits of approximately 7% and 3e4%, respectively. a r t i c l e i n f o

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“…LTB has very low photon energy dependence and low detection limit E10 mGy) along with a simple annealing procedure but low TL sensitivity compared with other common TL phosphors. Several dopants and codopants were tried to increase TL sensitivity [1][2][3][4][5][6][7][8]. Lithium borate doped with Mn was the first material to be reported for TL dosimetry [2] but, it has problem of low TL sensitivity and an emission in the 600 nm region, far from the good response region for most of the photomultipliers.…”

Section: Introductionmentioning

confidence: 99%