Ce:Y3Al5O12–Poly(methyl methacrylate) Composite for White-Light-Emitting Diodes

Saladino, Maria Luisa; Martino, Delia Chillura; Floriano, Michele; Hreniak, D.; Marciniak, Ł.; Stręk, W.; Caponetti, Eugenio

doi:10.1021/jp412173g

Cited by 27 publications

(17 citation statements)

References 23 publications

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“…These variations can account for specific interactions between the polymer and the surfaces of the Ce:YAG particles. In fact, in agreement with a previous finding [9,10], an electron donor-acceptor interaction between the carboxyl oxygen lone pair and the surface yttrium or cerium ions could take place. This specific interaction can account for the observed variations in the relaxation time due to the retrieval of electrons along the polymer chain.…”

Section: Resultssupporting

confidence: 92%

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Influence of the Ce:YAG Amount on Structure and Optical Properties of Ce:YAG-PMMA Composites for White LED

Armetta¹,

Sibeko

Luyt

et al. 2016

Zeitschrift Für Physikalische Chemie

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Ce:YAG-poly(methyl methacrylate) (PMMA) composites were prepared by using a melt compounding method, adding several amounts of Ce:YAG in the range 0.1-5 wt. %. The optical properties of the obtained composites and of the composites combined with a blue LED were measured to investigate the effect of the amount of Ce:YAG on the resulting emitted light in view of possible application in white LED manufacture. An increase in Ce:YAG amount caused an increase in the emission and a shift of 15 nm, influencing the white LED performance. The structure and morphology of the composites were studied. The results show that the interaction between the two components, observed by using solid state NMR experiments, are the responsible for the observed shift.

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Section: Resultssupporting

confidence: 92%

“…Recently, some of us demonstrated that polymeric composites of polymetylmethacrylate (PMMA) containing Ce:YAG is an ideal yellow light emitter complementary to a blue light to the realization of a white LED on a large scale [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Influence of the Ce:YAG Amount on Structure and Optical Properties of Ce:YAG-PMMA Composites for White LED

Armetta¹,

Sibeko

Luyt

et al. 2016

Zeitschrift Für Physikalische Chemie

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“…The carbon spin-lattice relaxation times in the rotating frame (T 1ρ C) were determined with the variable spin lock (VSL) pulse sequence [25] using delay times ranging from 0.4 to 30 ms and a contact time of 1.5 ms.…”

Section: Nanocomposites Characterizationmentioning

confidence: 99%

Organic-inorganic nanocomposites prepared by reactive suspension method: investigation on filler/matrix interactions and their effect on the nanoparticles dispersion

et al. 2017

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Epoxy resin/TiO 2 nanocomposites prepared by both reactive suspension method, based on in situ synthesis, and conventional mechanical mixing are analysed by solidstate nuclear magnetic resonance and transmission electron microscopy in order to have a deeper insight into the nature of interactions at the polymer/particle interface and their effect on the nanoparticles dispersion. Specifically, solid-state nuclear magnetic resonance experiments showed that the nanoparticles, synthesized by reactive suspension method, can efficiently link the matrix by hydrogen bonds forming a hybrid organic-inorganic 3D network. Such evidences strongly supports our previously reported theory, in which the nanoparticles in situ synthesized by reactive suspension method act not only as rigid filler, but also as actual cross-linking points, dramatically improving the mechanical properties of the polymeric matrix. Moreover, as revealed by transmission electron microscopy investigations, the formation of such hydrogen bonds significantly affect also the nanoparticles distribution, thanks to a stabilizing effect on the nanoparticles' surface that prevents their aggregation and improves their dispersion.

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“…88 It is therefore rather difficult to estimate the error on E chem 4f (Eu 2+ , A) as calculated by eqn (5). 88 It is therefore rather difficult to estimate the error on E chem 4f (Eu 2+ , A) as calculated by eqn (5).…”

Section: Review and Error Calculation Of Empirical Energy Level Modelingmentioning

confidence: 99%

“…[1][2][3][4][5][6][7] Furthermore, white LEDs are very important in modern displays, e.g. Phosphors, i.e.…”

Section: Introductionmentioning

confidence: 99%

Energy level modeling of lanthanide materials: review and uncertainty analysis

Joos

Poelman

Smet

2015

Phys. Chem. Chem. Phys.

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Energy level schemes are an essential tool for the description and interpretation of atomic spectra. During the last 40 years, several empirical methods and relationships were devised for constructing energy level schemes of lanthanide defects in wide band gap solids, culminating in the chemical shift model by Thiel and Dorenbos. This model allows us to calculate the electronic and optical properties of the considered materials. However, an unbiased assessment of the accuracy of the obtained values of the calculated parameters is still lacking to a large extent. In this paper, error margins for calculated electronic and optical properties are deduced. It is found that optical transitions can be predicted within an acceptable error margin, while the description of phenomena involving conduction band states is limited to qualitative interpretation due to the large error margins for physical observables such as thermal quenching temperature, corresponding to standard deviations in the range 0.3-0.5 eV for the relevant energy differences. As an example, the electronic structure of lanthanide doped calcium thiogallate (CaGa2S4) is determined, taking the experimental spectra of CaGa2S4:Ln(Q+) (Ln(Q+) = Ce(3+), Eu(2+), Tm(3+)) as input. Two different approaches to obtain the shape of the zig-zag curves connecting the 4f levels of the different lanthanides are explored and compared.

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Ce:Y₃Al₅O₁₂–Poly(methyl methacrylate) Composite for White-Light-Emitting Diodes

Cited by 27 publications

References 23 publications

Influence of the Ce:YAG Amount on Structure and Optical Properties of Ce:YAG-PMMA Composites for White LED

Influence of the Ce:YAG Amount on Structure and Optical Properties of Ce:YAG-PMMA Composites for White LED

Organic-inorganic nanocomposites prepared by reactive suspension method: investigation on filler/matrix interactions and their effect on the nanoparticles dispersion

Energy level modeling of lanthanide materials: review and uncertainty analysis

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