Potential problems in collection and data processing of luminescence signals

Wang, Y.; Townsend, Peter

doi:10.1016/j.jlumin.2013.03.052

Cited by 45 publications

(20 citation statements)

References 21 publications

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“…This is frequently overlooked but the problem has been discussed in a number of publications. 16,[29][30][31][32] The fast heating rate data are unsuitable for kinetic analysis. A second problem is that emission bands normally broaden with increasing temperature and may vary in terms of their luminescence efficiency.…”

Section: Discussionmentioning

confidence: 99%

Ion size effects on thermoluminescence of terbium and europium doped magnesium orthosilicate

et al. 2015

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Thermoluminescence (TL) and radioluminescence (RL) are reported over the temperature range 25-673 K from MgSiO 4 :Tb and MgSiO 4 :Eu. The dominant signals arise from the transitions within the Rare Earth (RE) dopants, with limited intensity from intrinsic or host defect sites. The Tb and Eu ions distort the lattice and alter the stability of the TL sites and the peak TL temperature scales with the Tb and Eu ion size. The larger Eu ions stabilize the trapped charges more than for the Tb, and so the Eu TL peak temperatures are ;20% higher. There are further size effects linked to the TL driven by the volume of the upper state orbitals of the rare earth transitions. For Eu the temperatures of the TL peaks are wavelength dependent since higher excited states couple to distant traps via more extensive orbits. The same pattern of peak temperature data is encoded in RL during heating. The data imply that there are sites in which the rare earth and charge stabilizing defects are closely associated within the host lattice, and the stability of the entire complex is linked to the lattice distortions from inclusions of impurities.

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Section: Discussionmentioning

confidence: 99%

Ion size effects on thermoluminescence of terbium and europium doped magnesium orthosilicate

et al. 2015

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“…The rates are low, in contrast with the commonly used higher rates used in many other measurements. High rates are acceptable for dosimetry where only the total signal is of interest, but rapid heating results in major temperature gradients 15,23 and so are inappropriate for the more fundamental investigations of the current work.…”

Section: Methodsmentioning

confidence: 99%

Competing roles of defects in SrAl₂O₄:Eu²⁺,Dy³⁺ phosphors detected by luminescence techniques

et al. 2016

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Thermoluminescence (TL) and radioluminescence (RL) spectra of the long-lasting phosphorescence of SrA1 2 O 4 :Eu 21 ,Dy 31 with A1N addition and commercially used SrA1 2 O 4 :Eu 21 ,Dy 31 were compared. Their spectra were slowly recorded over the temperature range from 25 to 673 K (400°C). A1N offers a higher temperature TL peak, which should lengthen the phosphor lifetime. However, both TL and RL, especially that below room temperature, reveal that there are additional decay paths for the samples of SrA1 2 O 4 :Eu 21 ,Dy 31 with A1N additions. These new defect sites reduce the phosphor efficiency. Some speculative models of potential sites are proposed and discussed. In addition, discontinuous intensity changes have been observed for both sample types in TL and RL spectra, which are assigned to the transitions of embedded impurity phases. The justification for this model is explained. Suggestions for future experimentation are also considered.

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“…This has resulted in numerous systematic errors in signal processing and a failure to exploit the strength of the technique, as recently reviewed in References [1,2]. The reality that starting materials may be poorly characterised relative to the analytical power of the luminescence also means that it can be difficult to usefully compare data from different sources and laboratories.…”

Section: Weaknesses In the Existing Literaturementioning

confidence: 99%

An Ideal System for Analysis and Interpretation of Ion Beam Induced Luminescence

Townsend

Crespillo

2015

Physics Procedia

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Luminescence is produced during ion beam implantation or ion-solid interaction for most insulators, and contains rich information. Surprisingly, the information extracted is often far from optimum. Rather than summarizing literature work, the focus here is to design an optimized and feasible target chamber that could offer far more information than what has currently been obtained. Such an improved and multi-probe approach opens a range of options to simultaneously record luminescence spectra generated by the ion beam, explore transient and excited state signals via probes of secondary excitation methods (such as ionisation or photo-stimulation). In addition, one may monitor optical absorption, reflectivity and lifetime dependent features, plus stress and polarization factors. A particularly valuable addition to conventional measurements is to have the ability to modulate both the ion beam and the probes. These features allow separation of transient lifetimes, as well as sensing intermediate steps in the defect formation and/or relaxation, and growth of new phases and nanoparticle inclusions. While luminescence methods are the most sensitive probes of defect and imperfection sites in optically active materials, less work has been performed at controlled low and high temperatures. Measurement with controlled cooling or heating of the samples is effective to reveal phase transitions (both of host and inclusions). Furthermore, simultaneous excitations (e.g. ions and photons) at different temperatures may lead to different end-phase or stale structure under extreme ionization conditions and enable fabrication of unique material structures. References to the existing literature will underline that the overall benefits of studying ion beam induced luminescence can be far more fruitful than that has normally been considered.

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Potential problems in collection and data processing of luminescence signals

Cited by 45 publications

References 21 publications

Ion size effects on thermoluminescence of terbium and europium doped magnesium orthosilicate

Ion size effects on thermoluminescence of terbium and europium doped magnesium orthosilicate

Competing roles of defects in SrAl₂O₄:Eu²⁺,Dy³⁺ phosphors detected by luminescence techniques

An Ideal System for Analysis and Interpretation of Ion Beam Induced Luminescence

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Potential problems in collection and data processing of luminescence signals

Cited by 45 publications

References 21 publications

Ion size effects on thermoluminescence of terbium and europium doped magnesium orthosilicate

Ion size effects on thermoluminescence of terbium and europium doped magnesium orthosilicate

Competing roles of defects in SrAl2O4:Eu2+,Dy3+ phosphors detected by luminescence techniques

An Ideal System for Analysis and Interpretation of Ion Beam Induced Luminescence

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Competing roles of defects in SrAl₂O₄:Eu²⁺,Dy³⁺ phosphors detected by luminescence techniques