Preparation of luminescent inorganic core/shell-structured nanoparticles

Milde, Moritz; Dembski, Sofia; Rupp, Sabine; Gellermann, Carsten; Sextl, Gerhard; Batentschuk, Miroslaw; Osvet, Andres; Winnacker, A.

doi:10.1557/opl.2011.781

Cited by 4 publications

(4 citation statements)

References 11 publications

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“…Gradually, many publications about NPPs with different hosts (aluminate, silicate, oxysulfide, etc.) and activation centers prepared by sol-gel technique were reported, such as Zn 3 Ga 2 Ge 3 O 10 :Cr,Pr, 2 ZnSiO 4 :Mn, 96 and CaMgSi 2 O 6 :Mn, 97 In addition to the size distribution, the sol-gel method also provides an opportunity to control the morphology (nanosphere, 98 nanowire, 99 etc.) of as-prepared materials by varying the synthesis conditions, including precursors, solvents, ligands, PH value, and treatment temperature.…”

Section: Solid-state Reactionmentioning

confidence: 99%

Long persistent phosphors—from fundamentals to applications

2016

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Owing to the unique mechanism of photoelectron storage and release, long persistent phosphorescence, also called long persistent luminescence or long lasting afterglow/phosphorescence, plays a pivotal role in the areas of spectroscopy, photochemistry, photonics and materials science. In recent years, more research has focused on the manipulation of the morphology, operational wavebands and persistent duration of long persistent phosphors (LPPs). These desired achievements stimulated the growing interest in designing bio-labels, photocatalysts, optical sensors, detectors and photonic devices. In this review, we present multidisciplinary research on synthetic methods, afterglow mechanisms, characterization techniques, materials system, and applications of LPPs. First, we introduce the recent developments in LPPs for the synthesis of nanoparticles from the aspects of particle sizes, monodispersity and homogeneity based on the urgent application of bio-imaging. In the later sections, we present the possible mechanisms, which involve the variation of trap distribution during the trapping and de-trapping process, complicated photo-ionization reaction of trap site levels and impurity centers together with their corresponding migration kinetics of carriers. Meanwhile, we emphasize the characterization techniques of defects, used to qualitatively or quantitatively describe the types, concentrations and depths of the traps. This review article also highlights the recent advances in suggested LPPs materials with a focus on the LPPs' hosts and optically active centers as well as their control, tuning and intrinsic links. We further discuss the classification of LPPs based on the different emission and excitation wavebands from the ultraviolet to the near-infrared region along with an overview of the activation mode of afterglow. Afterwards, we provide an exhibition of new products towards diverse application fields, including solar energy utilization, bio-imaging, diagnosis, and photocatalysts. Finally, we summarize the current achievements, discuss the problems and provide suggestions for potential future directions in the aforementioned parts.

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Section: Solid-state Reactionmentioning

confidence: 99%

Long persistent phosphors—from fundamentals to applications

2016

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“…As shown in Figure 4a, sol-gel method is generally composed of three steps: hydrolysis, condensation, and drying. [70][71][72] First, raw materials are dissolved in particular solvent forming reactive monomers through hydrolysis. Second, as the polymerization of monomers, sol can be obtained and gel can be formed after condensation.…”

Section: Sol-gel Methodsmentioning

confidence: 99%

Optically Stimulated Luminescence Phosphors: Principles, Applications, and Prospects

Yuan

Jin

et al. 2020

Laser & Photonics Reviews

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Optically stimulated luminescence (OSL) materials, enabling energy storage by capturing of charge carriers and then the energy conversion to light via photostimulation, can find many advanced applications in various fields, spanning from radiation dosimetry, optical data storage and security, environmental monitoring, biomedicine, clinical diagnostic, to archaeology and geology. At present, there are some blocks, including the development of nanocrystallization approaches, the tailoring of optical transitions, the control of trap distribution, and the understanding of OSL mechanisms, on the road to the exploration of OSL materials. This review gives an overview of the design, preparation, characterization, optimization, application, mechanism, and prospect of OSL materials. A short introduction of the fundamental principle and history of OSL materials is presented, followed by a summary of preparation and design methods, and a survey of OSL materials reported to date. The trap engineering, mechanism, and study methodologies of OSL are summarized, after which the widespread applications of OSL materials, in traditional and newly emerging fields, are reviewed. Finally, the merits and drawbacks of the OSL materials according to the relevant reports currently available are examined. The challenges and outlooks are highlighted and discussed in terms of five important aspects that merit future research.

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“…46,47 2.1.2 Silica particles. All incorporated particles were synthesized via a modied Stoeber process according to Dembski et al 48 and Milde et al 49 In the synthesis process of silica particles, 225 g of the precursor tetraethoxysilane (TEOS, 98%, Sigma-Aldrich Chemie GmbH, Germany) is hydrolyzed in 4.5 L ethanol (Sigma-Aldrich Chemie GmbH, Germany) and 225 mL of the catalyst ammonium hydroxide (NH 4 OH 25%, Fluka®, Honeywell International, Inc., USA). During aging at RT for 3 days, hydrolysis and condensation reaction of the silanol groups enable the formation of colloidal silica particles.…”

Section: Sample Preparationmentioning

confidence: 99%