Synthesis and light emitting properties of sulfide-containing polyfluorenes and their nanocomposites with CdSe nanocrystals: A simple process to suppress keto-defect

Yang, Chung He; Bhongale, Chetan; Chou, Cheng Hsuan; Yang, Sheng‐Hsiung; Lo, Chih Nan; Chen, Teng‐Ming; Hsu, Chain‐Shu

doi:10.1016/j.polymer.2006.11.012

Cited by 32 publications

(12 citation statements)

References 46 publications

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“…Colloidal semiconductor nanocrystals (quantum dots) have widely been used for color-converting materials globally. Combining the properties of the polymer matrix and the quantum dots could lead to high-performance composite materials that are needed for the LED package [ 6 , 7 ]. Owing to the transparency of silicone, it has been widely used as a polymer matrix.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Mechanical Properties of Silicone/Phosphor Composite Used in Light Emitting Diodes Package

et al. 2018

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Mass fraction of phosphor in silicone and aging time play important roles in the optics and mechanical performance of the silicone that is used in the light emitting diode (LED) package. In this paper, the mechanical properties of silicone/phosphor composites are investigated experimentally by separate tensile and compression tests. Distribution of the phosphors is observed by scanning electron microscopy (SEM) to ensure the homogeneity of the samples. Different loading rates are applied to study the silicone material’s rate-dependent properties. The experimental results of the tensile and compression test show that the Young’s modulus increases with the mass fraction of phosphor in silicone. Longer aging time stiffens the silicone composite and weakens the ductility of the materials. A three-dimensional model used cohesive zone material (CZM) between the interface of the phosphor particles, and matrix silicone is built up to study the degradation mechanism at a micro-scale level. The simulation results indicate that the diameter of particles in silicone also impacts its interface debonding and crack growth. The theoretical results concerning the mass fraction of phosphor are in good agreement with the experiments.

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Section: Introductionmentioning

confidence: 99%

Investigation of Mechanical Properties of Silicone/Phosphor Composite Used in Light Emitting Diodes Package

et al. 2018

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“…It is noteworthy, that at the voltage of 15 V, brightness of the samples in the presence of 1b and 1d was twice as high as that of a PLED with pure PF-EP. For the most of PFs with different substituents, the HOMO and LUMO levels are in the range 5.5 to 5.7 eV, and 2.5 to 3 eV, correspondingly [57]. The LUMO levels of the compounds 1b and 1d of 4.15 and 3.86 eV, respectively, act as levels that promote electron injection into the composite from Al (work-function 4.3 eV).…”

Section: Styrylthiophene In Composition Of Polymer Light-emitting Diodes (Pleds)mentioning

confidence: 99%

Modification of the carrier mobility of conducting PF-EP polymer by formation of their composites with thiophene derivatives

Tokarev

Fedorov

Moiseeva

et al. 2020

Organic Electronics

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In the paper we present synthesis and characterization of new donor-acceptor thiophene derivatives (TDs) containing vinylbenzo [d]thiazole, vinylpyridine and 1H-imidazo[4,5-f][1,10]phenanthroline residues. Using CELIV method, electron and hole mobility have been studied in the polymer layers based on poly [9,9-bis(6diethoxyl-phosphorylhexyl)fluorine] (PF-EP) doped with the TDs. Polymer light-emitting diodes (PLEDs) containing newly synthesized polyfluorene (PF) as emitting layers and PF-EP/TD composites as electron transporting layers show higher brightness at 15V as compared with TD free PF-EP.

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“…The search for novel functional materials with forthcoming applications in photovoltaics and optoelectronics [1][2][3][4][5][6][7][8][9] as well as in bio-medicine 10 is ongoing. While organic semiconducting polymers 11 are in the focus due to their easy processing and mechanical flexibility, inorganic semiconductor nanocrystals (NCs) 12 are favoured due to their size-dependent optical properties.…”

Section: Introductionmentioning

confidence: 99%

“…In both cases, direct linkage of organic and inorganic components offers the advantage to achieve well-defined materials while avoiding aggregation commonly observed in simple blend 19 or layered 20 systems. Poly(fluorene)s 11, 21 in combination with CdSe NCs were found to suppress the polymer's ketodefect in light-emitting diodes 9 and to enhance the efficiency of photodiodes. 5,6 Hybrid structures of wide-bandgap semiconducting polymers and strongly luminescent semiconductor NCs offer favourable perspectives in display technology through a combination of low-cost, large-area processability with a highly saturated emission colour.…”

Section: Introductionmentioning

confidence: 99%

Inorganic–organic nanocomposites of CdSe nanocrystals surface-modified with oligo- and poly(fluorene) moieties

et al. 2011

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We report a facile grafting-from strategy towards the synthesis of inorganic-organic composites of semiconductor nanocrystals and wide-bandgap polymers. Amino-functional fluorenes have been used as co-ligands for CdSe nanocrystals, thus enabling us to design their surface directly during the synthesis. Highly monodisperse, strongly emitting CdSe nanocrystals have been obtained. Subsequently, a straightforward Yamamoto C-C coupling protocol was used to carry out surface polymerisation, hence modifying CdSe nanocrystals with oligo-and poly(fluorene) moieties. Both amino-fluorene capped CdSe nanocrystals and the resulting nanocrystal-polymer composites were characterized in detail by optical and FT-IR spectroscopy, TEM, AFM, and gel permeation chromatography, showing their potential as novel functional inorganic-organic hybrid materials.

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Synthesis and light emitting properties of sulfide-containing polyfluorenes and their nanocomposites with CdSe nanocrystals: A simple process to suppress keto-defect

Cited by 32 publications

References 46 publications

Investigation of Mechanical Properties of Silicone/Phosphor Composite Used in Light Emitting Diodes Package

Investigation of Mechanical Properties of Silicone/Phosphor Composite Used in Light Emitting Diodes Package

Modification of the carrier mobility of conducting PF-EP polymer by formation of their composites with thiophene derivatives

Inorganic–organic nanocomposites of CdSe nanocrystals surface-modified with oligo- and poly(fluorene) moieties

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