Low temperature luminescence from the near surface region of Nd:YAG

Maghrabi, M.; Townsend, Peter; Vázquez, G. V.

doi:10.1088/0953-8984/13/11/308

Cited by 29 publications

(28 citation statements)

References 26 publications

(34 reference statements)

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“…By contrast, in other insulator materials where luminescence spectra have been recorded over a continuous temperature range, very clear and intense changes have been noted that match remarkably well to water, CO 2 , and oxygen transitions. The luminescence intensity events seen here may be less dramatic and clear cut than those in say Nd:YAG 40 or MgO, 39 but they should be seriously considered. Not least, as even the possibility of having impurity inclusions that can be detected by host luminescence is a topic that most experimentalists are unaware of, and consequently will not normally be considered.…”

Section: The Role Of Nanoparticle Inclusionsmentioning

confidence: 71%

“…In many examples, there are wavelength displacements of the spectra, and or major discontinuities in intensity, as reviewed, 15,38 for MgO 39 or for Nd:YAG where both spectral and lattice parameter changes were reported from CO 2 sublimation within nanoparticles, and ice effects were seen. 40 Such features are quite obvious from spectral changes of the host lattice that occur when the host undergoes a phase transition.…”

Section: The Role Of Nanoparticle Inclusionsmentioning

confidence: 99%

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Substrate lattice relaxations, spectral distortions, and nanoparticle inclusions of ion implanted zinc oxide

Wang

Zhang

et al. 2015

Journal of Applied Physics

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Low temperature radioluminescence and thermoluminescence spectra of ZnO track numerous changes produced by copper ion implantation into the surface layer. A significant, but unexpected, feature is that the bulk crystal becomes modified by the stress generated in the surface layer. This is reflected by the energy of intrinsic band gap emission. There are also differences in the spectra and peak temperatures of the thermoluminescence components, consistent with such a structural relaxation. The copper implant layer is both absorbing and reflective, so this introduces major distortions on the radioluminescence component from the bulk region, since the bulk luminescence signals are transmitted through, or reflected from, the implant layer. The temperature dependence of the spectra includes anomalies that are typical of changes driven by phase transitions of nanoparticle inclusions. Overall, the features of bulk relaxation, spectral distortion, and detection of nanoparticle inclusions are rarely considered for ion implanted luminescence studies, but the data suggest they are almost inevitable in a wide range of implanted materials.

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Section: The Role Of Nanoparticle Inclusionsmentioning

confidence: 71%

Section: The Role Of Nanoparticle Inclusionsmentioning

confidence: 99%

Substrate lattice relaxations, spectral distortions, and nanoparticle inclusions of ion implanted zinc oxide

Wang

Zhang

et al. 2015

Journal of Applied Physics

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“…Unexpected events can occur with dramatic intensity steps during heating or cooling at temperatures which match phase transitions of inclusions of impurities, including common contaminants, probably in the form of nanoparticle inclusions. Such step signatures occur near 200 K for CO 2 [16], or 170 and 100 K for ice [17]. Other trapped gas events are seen which match the presence of Ar [18], O 2 and N 2 etc.…”

Section: Introductionmentioning

confidence: 78%

Cathodoluminescence from mixed KTaO₃‐KNbO₃ crystals

Kibar

Townsend

Wang

et al. 2007

Phys. Status Solidi (c)

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Cathodoluminescence spectra are shown for a sequence of mixed crystals of KTaO 3 :KNbO 3 . The luminescence emission bands are broadly similar across the spectrum from 250 to 850 nm, although their relative strengths are sensitive to composition and temperature. A UV band near 330 nm is only well resolved in some compositions and a broad line near 700 nm may arise from Cr ions. The presence of low temperature phase transitions within the crystals is evidenced by intensity steps and spectral changes of the cathodoluminescence. Hysteresis is seen, as are domain effects and electric field shifts of the transition temperatures. The cathodoluminescence of the surface material reveals more transitions than are reported from earlier bulk studies. ] pre-phase softening, precursor effects, plus additional phases [4,7] and existence of dipolar glassy states [8]. In part some differences may result from inaccuracies in the measurement of the Nb concentration, since there are significant differences between compositions of the growth melt and the crystal, as well as sample uniformity.The KTN materials offer a useful framework to explore phase transitions by variations in optical properties. Optical absorption and second harmonic generation have also revealed extra sub-phases [7]. Luminescence properties similarly reveal phase transitions, as briefly reviewed [9], with changes in spectra between phases (as for NH 4 Br [10]), minor wavelength shifts [11], charge release and intense emission events at the phase transition for KNbO 3 [12], irreversible phase changes [13], or those which require a high temperature regeneration of the starting phase [14] and hysteresis effects between cooling and heating [12]. There can be differences between the spectra and the number of detectable phase transitions when recording luminescence with X-ray excitation (RL, radioluminescence) or electrons (CL, cathodoluminescence) [15]. Such differences exist since surface relaxation processes sensed by CL can proceed more readily than those in the bulk material, as for RL. Surface damage as the result of polishing and/or contaminants may additionally result in local changes in phase, composition or dislocation density. Unexpected events can occur with dramatic intensity steps during heating or cooling at temperatures

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“…25,26 Very common examples have been water, CO 2 , O 2 , and N 2 impurities. Indeed the data shown in Figs.…”

Section: Discussionmentioning

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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Low temperature luminescence from the near surface region of Nd:YAG

Cited by 29 publications

References 26 publications

Substrate lattice relaxations, spectral distortions, and nanoparticle inclusions of ion implanted zinc oxide

Substrate lattice relaxations, spectral distortions, and nanoparticle inclusions of ion implanted zinc oxide

Cathodoluminescence from mixed KTaO₃‐KNbO₃ crystals

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

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Low temperature luminescence from the near surface region of Nd:YAG

Cited by 29 publications

References 26 publications

Substrate lattice relaxations, spectral distortions, and nanoparticle inclusions of ion implanted zinc oxide

Substrate lattice relaxations, spectral distortions, and nanoparticle inclusions of ion implanted zinc oxide

Cathodoluminescence from mixed KTaO3‐KNbO3 crystals

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

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Cathodoluminescence from mixed KTaO₃‐KNbO₃ crystals

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