Preparation and characterisation of Ce:YAG -polycarbonate composites for white LED

Saladino, Maria Luisa; Armetta, Francesco; Sibeko, Motshabi Alinah; Luyt, Adriaan S.; Martino, Delia Chillura; Caponetti, Eugenio

doi:10.1016/j.jallcom.2016.01.009

Cited by 18 publications

(13 citation statements)

References 23 publications

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“…Addition of the Ln III salts to the polymers leads to a shift of the diffraction peaks from 20°to 15°for the BEP polymer (Figure 2), as a result of a change in the structural packing of the polymers, most likely caused by coordination of Ln III to the chelating units of the polymers. [35] However, no significant shift is observed in the diffractograms of the BDP polymer indicating that no structural changes of the BDP polymer occur following Ln III coordination (Figure 2). [35] The thermal properties of the polymers and their Ln III systems were investigated by TGA and DSC.…”

Section: Resultsmentioning

confidence: 98%

“…[35] However, no significant shift is observed in the diffractograms of the BDP polymer indicating that no structural changes of the BDP polymer occur following Ln III coordination (Figure 2). [35] The thermal properties of the polymers and their Ln III systems were investigated by TGA and DSC. The 50 % weight loss (T -50 ) of the BDP polymer shifts from 230°C to 226 and 224°C for the Eu III and Tb III systems, respectively ( Figure S14a).…”

Section: Resultsmentioning

confidence: 98%

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Sensitization of Ln^III (Ln = Eu, Tb, Tm) Ion Luminescence by Functionalized Polycarbonate‐Based Materials and White Light Generation

et al. 2017

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Abstract:We prepared pyridine-2,6-bis(ethyl)ester [BEP] and pyridine-2,6-bis(diethylamide) [BDP] polymers with polycarbonate backbones by ring-opening polymerization of the pyridinebis(ethyl)ester and pyridine-bis(diethylamide) units appended to a cyclic carbonate via a glycol chain. The polymers were characterized by FTIR, NMR, UV/Vis absorption and fluorescence spectroscopy, as well as SEC, powder XRD, DSC, and TGA. The measured glass transition temperature (T g ) of the BEP polymer was shifted from -32°C to -7 and -8°C after coordination of the Eu III and Tb III ions, respectively. Similarly, the T g of the BDP

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 98%

Sensitization of Ln^III (Ln = Eu, Tb, Tm) Ion Luminescence by Functionalized Polycarbonate‐Based Materials and White Light Generation

et al. 2017

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“…In the composites, the band intensity increases with the amount of Ce:YAG. Since it is well known that the luminescent intensity is related to the average distance between luminescent centres [11], this could be due to the concentration of Ce:YAG in the polymer. The Ce:YAG-PMMA composites loaded with 0.5 and 5 wt.…”

Section: Resultsmentioning

confidence: 99%

“…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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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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“…Moreover, the low thermal conductivity and poor thermal stability of the epoxy resin limits the heat conductivity of the blue chips. On the contrary, thin film‐based fluorescent conversion materials have high light uniformity, great thermal stability, and support the packaging of LED chip arrays …”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of YAG:Ce thin phosphor films by pulsed laser deposition

Cao

et al. 2016

Int J Applied Ceramic Tech

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International audienceWe report the use of YAG:Ce phosphor as the raw material to make thin and transparent phosphor films with pulsed laser deposition including the effects of heating temperature, target–substrate distances, annealing times, and annealing atmosphere on the YAG:Ce3+ phosphor film crystal types and spectral properties. The results indicated that at a coating temperature of 350°C, the YAG:Ce3+ phosphor film had the best crystallinity with an intact film and maximum fluorescence emission. The crystallinity and fluorescence emission intensity of the film gradually decreased as a function of increasing target–substrate distances. As the annealing time increased, the crystallinity and the fluorescence emission intensity of the film first increased and then decreased. The film made with 5 h of annealing had the best crystallinity and the highest fluorescence emission intensity. The crystallinity of the film annealed under air was higher than that made under nitrogen; the fluorescence intensity of the film under air was slightly lower than the film under nitrogen. The emission peak of the prepared film was at 523 nm when excited at 450 nm. This is slightly blue-shifted versus the emission of commercial phosphor powders. This study offers a theoretical basis for the development of transparent phosphor films. © 2016 The American Ceramic Societ

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Preparation and characterisation of Ce:YAG -polycarbonate composites for white LED

Cited by 18 publications

References 23 publications

Sensitization of Ln^III (Ln = Eu, Tb, Tm) Ion Luminescence by Functionalized Polycarbonate‐Based Materials and White Light Generation

Sensitization of Ln^III (Ln = Eu, Tb, Tm) Ion Luminescence by Functionalized Polycarbonate‐Based Materials and White Light Generation

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

Preparation and characterization of YAG:Ce thin phosphor films by pulsed laser deposition

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Preparation and characterisation of Ce:YAG -polycarbonate composites for white LED

Cited by 18 publications

References 23 publications

Sensitization of LnIII (Ln = Eu, Tb, Tm) Ion Luminescence by Functionalized Polycarbonate‐Based Materials and White Light Generation

Sensitization of LnIII (Ln = Eu, Tb, Tm) Ion Luminescence by Functionalized Polycarbonate‐Based Materials and White Light Generation

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

Preparation and characterization of YAG:Ce thin phosphor films by pulsed laser deposition

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Sensitization of Ln^III (Ln = Eu, Tb, Tm) Ion Luminescence by Functionalized Polycarbonate‐Based Materials and White Light Generation

Sensitization of Ln^III (Ln = Eu, Tb, Tm) Ion Luminescence by Functionalized Polycarbonate‐Based Materials and White Light Generation