Luminescence detection of phase transitions, local environment and nanoparticle inclusions

Townsend, P. D.; Yang, Binsheng; Wang, Y.

doi:10.1080/00107510802381418

Cited by 35 publications

(18 citation statements)

References 62 publications

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“…In the present article, examples are demonstrated with ZnO. The technique has been reported and reviewed, 15 with many other materials. Unfortunately, the literature of such effects is rather limited, primarily because the method has not been applied due to equipment limitations of most luminescence systems.…”

Section: Introductionmentioning

confidence: 96%

“…With STO, the various phases were seen only in the heavily implanted (and therefore stressed) crystals. 15,24 Indeed, the more general possibility of monitoring phase transitions by noting the discontinuities in emission spectra is well documented for a large number of insulator and other materials, as noted in various reviews. 15 The waveguide and STO examples support the model for bulk relaxation of ZnO, driven by stresses related to high dose surface implantation.…”

Section: A Structural Relaxations Of Substratesmentioning

confidence: 99%

“…The effects are clear since the phase change provides a discontinuity in the pressure conditions. 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: Introductionmentioning

confidence: 96%

Section: A Structural Relaxations Of Substratesmentioning

confidence: 99%

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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“…For CO2 there is a well documented sublimation temperature, ice has a cubic to hexagonal structural change, and the gases all go through the usual shifts from solid to liquid to gas. Numerous such examples have been detected and reviewed [19][20][21]. Note however the phase transitions of nanoparticles may occur at temperatures which vary with particle size.…”

Section: Fig8 Phase Transitions and Hysteresis Detected By Luminescementioning

confidence: 99%

“…The Sussex spectral system has contributed to detection of phase transitions for many materials, as summarised and referenced in our reviews [19][20][21], not just for insulators, but also for fullerenes and high temperature superconductors. In some cases the signals originate via contaminants rather than the target system.…”

Section: Phase Transitionsmentioning

confidence: 99%

Unexploited Information from Luminescence Spectra

Townsend¹

2016

Journal of Nuclear Sciences

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Luminescence is a highly sensitive technique to monitor the presence of impurities, imperfections and lattice distortions. To fully exploit it requires sensitive detection systems with high resolution spectral data and temperature control. This review notes both how detector technology has advanced, and mentions simple routes to generate more efficient use of existing photomultipliers. Modern detectors enable wavelength multiplexed spectrometer systems, which are prerequisites for both detailed thermoluminescence analyses and newer applications. These include recording the spectral changes from different crystalline phases, and capturing their characteristic intensity signatures at the phase transition temperature. Less expected is that the luminescence intensity is strongly influenced by the presence of impurities, even when they are not dispersed in the host lattice, but are grouped as nanoparticle inclusions. Spectacular host intensity changes can occur when the inclusions undergo phase transitions. Luminescence is also frequently used to monitor ion implanted materials, but for examples reported here, the spectra can be seriously distorted by absorption and reflectivity properties of the implant layer. Further, luminescence data have demonstrated that the underlying host material can be stressed and then relax into new structural phases. These aspects of spectral distortion and lattice relaxations may be far more common than has been noted in the previous literature. Finally, because the techniques are multi-disciplinary, brief mentions of systematic errors in signal analysis are noted.

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Communicating Particles: Identification Taggant and Temperature Recorder in One Single Supraparticle

Reichstein

Miller

Wintzheimer

et al. 2021

Adv Funct Materials

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“Communicating particles” are reported that combine an identification (ID) taggant and a temperature recorder in one single entity—a micron‐scaled supraparticle. The optical information carriers within the hybrid inorganic‐organic supraparticles are three different types of luminescent nanoparticles, which can be read‐out using single‐wavelength excitation. These three nanoparticle types are assembled into a core‐satellite structure via a two‐step droplet evaporation technique. The core is built‐up from Tb3+ and Eu3+‐doped nanophosphors, providing an environmentally stable ID that is easily tunable through ratiometric spectral coding. This core is surrounded by organic, dye‐doped polymer nanoparticle satellites, acting as thermal‐history‐recorders of their environment. Exposed to a threshold temperature, the luminescence of the utilized 7‐diethylamino‐4‐methylcoumarin‐doped polymer nanoparticles is irreversibly quenched. This “turn‐off ” signal response is attributed to conformational changes in the dyes’ excited state and an alteration of their molecular environment, respectively, triggered by the polymer nanoparticles’ glass transition. Thus, the sensitivity of the temperature recorder can be configured over a wide temperature range by varying the dye‐hosting polymer. At the same time, the ID of the particle, stemming from its inorganic building blocks, stays unaffected, thus stable against thermal changes. The idea of communicating particles introduces a promising concept for smart additives.

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Luminescence detection of phase transitions, local environment and nanoparticle inclusions

Cited by 35 publications

References 62 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

Unexploited Information from Luminescence Spectra

Communicating Particles: Identification Taggant and Temperature Recorder in One Single Supraparticle

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