Thermal recovery and thermoluminescence of room-temperature X-irradiated NaCl:Pb<sup>2+</sup>single crystals

Navarro, A.M. Mudarra; López, F. J.

doi:10.1088/0022-3727/18/5/018

Cited by 10 publications

(8 citation statements)

References 43 publications

(18 reference statements)

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“…Besides the brightness, one important factor in selecting phosphor in color co-ordinates as was reported [21,35]. Ce 3+ known to be a sensitizer for Tb 3+ in many hosts [9][10][11][12][13][14]31]. The emission efficiency is the preferential factor for designing a new phosphor is then,we concluded that co-doping the Ce 3+ ions is a helpful way to modify the emission band of the KBr:Tb phosphor and thereby brightness can be enhanced successfully.…”

Section: Photoluminescencesupporting

confidence: 50%

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Luminescence Properties and Optical Absorption of X ray-Irradiated KBr: Ce3+, Tb3+ Crystals

Bangaru¹,

Saradha²,

Muralidharan

2015

J Fluoresc

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This paper reports that KBr doubly doped with Tb(3+) and Ce(3+) were prepared by Bridgman-Stockbarger method and characterized by Optical absorption, Photoluminescence (PL), Thermoluminescence (TL), Photo stimulated emission (PSL) and TL emission, after X-ray irradiation have been observed. The optical absorption measurement indicates that F and Z3 centers are formed in the crystal during X-ray irradiation process. It was attempted to incorporate a broad band of Ce(3+) sensitizer into the narrow band emission of Tb(3+) in the KBr host without reduction of emission intensity. Co-doping of Ce(3+) ions in KBr:Tb(3+) crystal showed a broad band emission due to the d-f transition of Ce(3+) and a reduction in the intensity of emission peaks due to (5)days → (7)F6 transition of Tb(3+) when they were excited at 250 nm. These results supported that an effective energy transfer occurs from Ce(3+) to Tb(3+) in the KBr host. Co-doping Ce(3+) ions greatly intensified the excitation peak at 260 nm for the emission at 390 nm of Tb(3+) which means that more lattice defects, involved in the energy absorption and transfer to Tb(3+), are formed by the Ce(3+) co-doping. The integrated light intensity is two orders of magnitude higher as compared to the undoped samples for similar doses of irradiation and heating rate. Thermoluminescence process has been identified due to thermal mobilization of F-electrons and this causes peaks at 371 K and at 427 K, 457 K in KBr: Ce(3+), Tb(3+) crystals. The defects generated by irradiation were monitored by optical absorption and trap parameters for the TL process were calculated and presented.

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Section: Photoluminescencesupporting

confidence: 50%

“…Such results have been reported on Rubidium halides doped with Tb 3+ by Manimozhi et.al. [4,23,[27][28][29][30][31][32][33][34]. Considering the fact that the new absorption appears on F bleaching, it appears more appropriate to assign the new absorption to an electron excess center.…”

Section: Optical Absorptionmentioning

confidence: 99%

Luminescence Properties and Optical Absorption of X ray-Irradiated KBr: Ce3+, Tb3+ Crystals

Bangaru¹,

Saradha²,

Muralidharan

2015

J Fluoresc

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“…TL studies on alkali halides have led to a good understanding of different aspects of the process, mechanism and mobile carriers [13,14] utilization of thermoluminescent phosphors for various applications like dosimetry [15], geology/geochronology [16], forensic sciences [17], etc.…”

Section: Introductionmentioning

confidence: 99%

Thermoluminescence and other optical studies on RbBr:Tb³⁺ crystals

Manimozhi

Muralidharan

Selvasekarapandian

et al. 2007

Physica Status Solidi (b)

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Optical absorption, photoluminescence, photostimulated luminescence (PSL) and thermoluminescence (TL) studies on RbBr : Tb 3+ crystals irradiated with X-rays is reported. The optical absorption in the UV region confirms the presence of terbium in the host matrix in the trivalent state. Photoluminescence of these crystals exhibits characteristic Tb 3+ emissions due to transitions from the 5 D 3 and 5 D 4 levels to various levels of the 7 F septet. On F-bleaching X-irradiated crystals Z 3 centers are observed. The TL glow curve indicates a two-step thermal annihilation process for the radiatively created defects. The presence of the characteristic emissions due to terbium ions in the photostimulation at the F band confirms the participation of Tb ions in the defect-production process. Trap parameters for the TL process are calculated and presented. Emissions under the TL glow peaks contain the characteristic emissions of Tb 3+ in addition to the emission due to the recombination of the F electron with V-type centers.

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“…The thermal treatments strongly modify the aggregation state of impurity in the host lattice [10]. Thus, it is reasonable to assume that the variations in the aggregation state of impurity produces differences in the relative positions and intensities of glow peaks.…”

Section: Discussionmentioning

confidence: 99%

Thermoluminescence in pre-heat treated NaCl crystals doped with yttrium

Reddy

2004

Materials Letters

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Thermal recovery and thermoluminescence of room-temperature X-irradiated NaCl:Pb²⁺single crystals

Cited by 10 publications

References 43 publications

Luminescence Properties and Optical Absorption of X ray-Irradiated KBr: Ce3+, Tb3+ Crystals

Luminescence Properties and Optical Absorption of X ray-Irradiated KBr: Ce3+, Tb3+ Crystals

Thermoluminescence and other optical studies on RbBr:Tb³⁺ crystals

Thermoluminescence in pre-heat treated NaCl crystals doped with yttrium

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Thermal recovery and thermoluminescence of room-temperature X-irradiated NaCl:Pb2+single crystals

Cited by 10 publications

References 43 publications

Luminescence Properties and Optical Absorption of X ray-Irradiated KBr: Ce3+, Tb3+ Crystals

Luminescence Properties and Optical Absorption of X ray-Irradiated KBr: Ce3+, Tb3+ Crystals

Thermoluminescence and other optical studies on RbBr:Tb3+ crystals

Thermoluminescence in pre-heat treated NaCl crystals doped with yttrium

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Product

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Thermal recovery and thermoluminescence of room-temperature X-irradiated NaCl:Pb²⁺single crystals

Thermoluminescence and other optical studies on RbBr:Tb³⁺ crystals