An alternative technique for optically stimulated luminescence (OSL) experiment

Bulur, E.

doi:10.1016/s1350-4487(97)82884-3

Cited by 254 publications

(137 citation statements)

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“…where T is twice the length of the OSL decay length of 1632 µs (Bulur, 1996). Prior to fitting, an average background _ b estimated from the last 10 data points is removed.…”

Section: 'True' Lm-osl Vs Pseudo Lm-oslmentioning

confidence: 99%

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Towards multi-exponential analysis in optically stimulated luminescence

Ankjærgaard¹,

Jain²,

Hansen³

et al. 2010

J. Phys. D: Appl. Phys.

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Optically Stimulated Luminescence (OSL) data from quartz can follow different mathematical forms depending on the stimulation mode. These data can be described in terms of different multi-exponential models and can be numerically fitted using several well-known methods. Here we make a comparative analysis of the performance and stability of two models, the decay and peak form, and we consider different transformation methods for obtaining the peak form. For the numerical computations we use a nonlinear least squares (NLS) method and a method based on a first-kind Fredholm integral equation (FIE). Our analysis uses artificial data with three components (seven parameters including the background), and ten different levels of background, both the signal and the background contain Poisson distributed noise.Parameters derived using both models are acceptable (statistically consistent and on an average within ~1% of the expected value) and no obvious preference is observed for any particular model, although there may be a suggestion that peak form data shows a smaller mean bias. This conclusion seems to be independent of the type of peak transformations investigated here. Furthermore, it is found that transformation of OSL decay data to a peak form gives better results than direct measurement of peak form data by, for example, varying the stimulation light intensity. The comparison of the two numerical methods suggests that the NLS method performs somewhat better than the FIE method; however, the latter has the advantage that it does not require the 2 user's judgement on the number of components in the data. Testing of the NLS procedure on a measured quartz time-resolved OSL signal (TR-OSL) transformed into peak form yielded reliable parameter estimates even when the signal intensity was deliberately reduced by a factor of sixteen.

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“…where T is twice the length of the OSL decay length of 1632 µs (Bulur, 1996). Prior to fitting, an average background _ b estimated from the last 10 data points is removed.…”

Section: 'True' Lm-osl Vs Pseudo Lm-oslmentioning

confidence: 99%

“…this technique was named as linearly modulated OSL (LM-OSL) (Bulur, 1996). LM-OSL results in a signal that can be described using the single trap/centre model by the following model:…”

Section: Introductionmentioning

confidence: 99%

Towards multi-exponential analysis in optically stimulated luminescence

Ankjærgaard¹,

Jain²,

Hansen³

et al. 2010

J. Phys. D: Appl. Phys.

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“…The methods used were: Curve-Fitting of Thermal Analysis, Linear Modulation Technique [16], General Order (GO) [17] Model and Active-OSL (AOSL) Approximation [18,19].…”

Section: Introductionmentioning

confidence: 99%

Dose-Dependence of Trap Parameters of OSL Decay from Al<sub>2</sub>O<sub>3</sub>:C

Tanir

Bölükdemir²,

Ghomi³

2012

WJNST

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Optically Stimulated Luminescence (OSL) trap parameters can only be reliably determined through the detailed analysis of OSL decay curves. In this study the kinetic parameters of a blue-light stimulated luminescence (BLS) decay curve from Al 2 O 3 :C sample irradiated at 0.1, 0.15, 0.2, 0.4 and 0.6 Gy beta doses were obtained using the same basic methods with some modifications applied and also by using our suggestion: Active-OSL Approximation (AOSL). The results were compared with those of other studies on the trap parameters of Al 2 O 3 :C material.

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“…In 1996 Bulur 13 introduced a new method of measuring OSL by ramping the stimulation intensity linearly in time, producing a linearly modulated ͑LM͒ optically stimulated luminescence ͑LM-OSL͒ signal. Later on, Bulur 14 showed that this LM-OSL signal can also be obtained from the CW-OSL signal by a simple mathematical transformation.…”

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confidence: 99%

Optically stimulated luminescence signals under various stimulation modes assuming first-order kinetics

Bos

Wallinga

2009

Phys. Rev. B

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We present mathematical descriptions of optically stimulated luminescence ͑OSL͒ signals under linearly, hyperbolically, exponentially, and reciprocally increasing stimulation intensity for a one-trap one-recombination-center model assuming charge transfer governed by first-order kinetics. Depending on the stimulation mode, the OSL signal can be monotonically increasing, monotonically decreasing, show a peak shape, or be constant. The shape of the OSL signal is controlled by a stimulation-rate parameter ͑governed by the stimulation mode͒ and a decay-rate parameter that is proportional to the photoionization cross section. We demonstrate that the luminescence signal as a function of time under exponentially increasing-optical stimulation ͑EM-OSL͒ shows the same evolution in time as the luminescence signal under hyperbolically increasingthermal stimulation ͑HM-TL͒. This similarity allows a new interpretation of the I · t versus In t plot, where I is the optically stimulated luminescence intensity and t is the time. For a phosphor with several optically active traps, the OSL signal will contain several components. We show that the mathematical descriptions of the OSL signals under all stimulation modes can be related to the description of the OSL signal derived with continuous-wave ͑CW͒ stimulation. These so-called pseudo-OSL signals are helpful in a visualization of the various components in the OSL signal, where different pseudo-OSL transformations can be used to amplify different aspects. We demonstrate that the stimulation mode or pseudo-OSL transformation used has no effect on the overlap of the different OSL components. This implies that for the separation of multiple OSL components there is, in principle, no preference for a specific stimulation mode or pseudo-OSL transformation. Finally, we present a transformation related to hyperbolically modulated OSL which does facilitate separation of OSL components and may be of use for determining component specific photoionization cross sections or trapped-charge concentrations.

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An alternative technique for optically stimulated luminescence (OSL) experiment

Cited by 254 publications

References 10 publications

Towards multi-exponential analysis in optically stimulated luminescence

Towards multi-exponential analysis in optically stimulated luminescence

Dose-Dependence of Trap Parameters of OSL Decay from Al<sub>2</sub>O<sub>3</sub>:C

Optically stimulated luminescence signals under various stimulation modes assuming first-order kinetics

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An alternative technique for optically stimulated luminescence (OSL) experiment

Cited by 254 publications

References 10 publications

Towards multi-exponential analysis in optically stimulated luminescence

Towards multi-exponential analysis in optically stimulated luminescence

Dose-Dependence of Trap Parameters of OSL Decay from Al&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt;:C

Optically stimulated luminescence signals under various stimulation modes assuming first-order kinetics

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Dose-Dependence of Trap Parameters of OSL Decay from Al<sub>2</sub>O<sub>3</sub>:C