Spectroscopy of traps by fractional glow technique

Gobrecht, H.; Hofmann, Dieter

doi:10.1016/0022-3697(66)90194-6

Cited by 268 publications

(78 citation statements)

References 18 publications

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“…In this case, the trap level is not regarded as a discrete energy level located in the band gap of the host material, but rather a continuum of energy levels around a certain mean value. This possibility has been explored by various authors, 21,[26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41] and three main types of trap distributions have been considered: uniform, exponential, and Gaussian profiles.…”

Section: Continuous Trap Depth Distributionsmentioning

confidence: 99%

“…An extension to the preheating technique is known as the "fractional glow" technique, in which the temperature is constantly varied during the TL measurement. 27 Although this technique is also able to estimate the shape of the continuous trap depth distribution, the setup and data analysis are much more demanding. 46 In principle, a fading experiment, where the duration between the excitation and the actual TL experiment is varied, could provide similar information about the presence of a trap depth distribution.…”

Section: Combining Tl and Initial Rise Analysis For Trap Depth Spementioning

confidence: 99%

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Revealing trap depth distributions in persistent phosphors

et al. 2013

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Persistent luminescence or afterglow is caused by a gradual release of charge carriers from trapping centers. The energy needed to release these charge carriers is determined by the trap depths. Knowledge of these trap depths is therefore crucial in the understanding of the persistent luminescence mechanism. Unfortunately, the trap depths in persistent phosphors are often difficult to evaluate in an accurate and reliable way. The existing analysis methods are mostly based on single experiments, or they ignore the possibility of a continuous distribution of trap depths. We present a procedure to accurately probe the activation energies, even in the presence of a continuous distribution of energy levels. By performing a series of thermoluminescence experiments with varying excitation duration and at varying excitation temperature, and employing the initial rise analysis method, the depth and shape of such a distribution can be estimated. As an example, we investigated the trap system in the violet persistent phosphor CaAl 2 O 4 :Eu,Nd, and show that it consists of a Gaussian-shaped distribution of trap depths. The maximal density of traps lies in the region around 0.9 eV, but the distribution extends to 0.7 eV on the shallow side and 1.2 eV on the deep side. The described procedure can be used to obtain a clear view of the trap system in other persistent phosphors as well. This can lead to a better understanding of the nature of these trapping centers, and the role they play in the persistent luminescent mechanism.

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Section: Continuous Trap Depth Distributionsmentioning

confidence: 99%

Section: Combining Tl and Initial Rise Analysis For Trap Depth Spementioning

confidence: 99%

Revealing trap depth distributions in persistent phosphors

et al. 2013

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“…Fractional glow technique initiated by Gobrecht and Hofmann [1] seems to be the most obvious method of trap distribution spectrum estimation [2]. However, there are not many laboratories which use this method as a common way of trap depth problem treatment.…”

mentioning

confidence: 99%

Measurement System for Fractional Glow Technique

1992

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“…The mean value of the heating and cooling rate were respectively 0.1 and 0.070C/s all over the cycles. The sample thermal contact with the heating strip was controlled by observation of the heating and cooling curve shape [11] during experiments.…”

Section: Methodsmentioning

confidence: 99%

“…It has to be mentioned that the only method which allows to determine independently the EDST is the fractional glow technique (FGT) introduced by Gobrecht and Hofmann [11]. This method has been used with success in many investigations [12][13][14][15] and is constantly improved [16,17].…”

Section: Introductionmentioning

confidence: 99%

Trap Spectra of Annealed Quartz

1996

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The trap energy density spectra of natural quartz were investigated by the fractional glow technique. The thermal treatment before excitation induces the changes of thermoluminescence sensitivity as well as the changes of trap spectrum. After annealing at temperature higher than 400°C, a new kind of trap is observed. The frequency factor was determinated by the fitting of the theoretical glow curve calculated using the trap depth measured by fractional glow technique to experimental one.

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Spectroscopy of traps by fractional glow technique

Cited by 268 publications

References 18 publications

Revealing trap depth distributions in persistent phosphors

Revealing trap depth distributions in persistent phosphors

Measurement System for Fractional Glow Technique

Trap Spectra of Annealed Quartz

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