Synthesis and electroluminescence properties of a novel tetraphenylsilane–oxadiazole–diphenyl(para-tolyl)amine polymer

J of Applied Polymer Sci

Hsu

2007

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A series of triarylaminooxadiazole-containing tetraphenylsilane light emitting polymer (PTOA) and poly(2-methoxy, 5-(2 0 -ethyl-hexyloxy)-p-phenylene-vinylene) (MEH-PPV) based white light emitting polymer devices (PLEDs) were fabricated to study blue and orange-red emitter composition and light emitting layer processing effects on white emission electroluminescence properties. Color purity, current turn-on voltage, brightness, and current efficiency were strongly determined by MEH-PPV content and the thin film processing condition. The intensity of PTOA blue emission was equal to that of MEH-PPV orange-red emission when the device was fabricated by a polymer composite film containing 10 wt % of MEH-PPV. Color purity [Commission Internationale de L'Eclairage (CIE x,y ) coordinates (0.26,0.33)] was nearly white emission under applied 8 V. The brightness and current efficiency of PTOA-MEH-PPV composite film based devices increased as MEH-PPV content increased. Furthermore, white emission blue shifted with increasing spin-rate of thin film coating and applied voltage. Low turn-on voltage, high current density, and high brightness were obtained for the device fabricating with light emitting layer coating with high spin-rate. Moreover, low current efficiency was obtained for the PLED with a thinner light-emitting layer. A white emission CIE (0.28,0.34) was obtained for PTOA-MEH-PPV based white PLED. White PLED brightness and efficiency can be as high as 700 cd/m 2 and 0.78 cd/A, respectively.

Section: Resultsmentioning

confidence: 99%

“…The PTOA synthesis procedure is reported in the previous literature. 38 PTOA possesses a very high T g of 2188C. The 5% weight loss point appeared at 3738C.…”

Section: Methodsmentioning

confidence: 98%

Section: -41mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Enhancing the electroluminescence properties of novel blue light emitting polymer and MEH‐PPV based white light emitting polymer devices by processing condition optimization

J of Applied Polymer Sci

Hsu

2007

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“…[30][31][32][33][34][35] We have recently synthesized a novel triarylaminooxadiazole-containing tetraphenylsilane light-emitting polymer (PTOA). 39 The PTOA-based PLED moderate brightness and efficiency is due to EL quenching of electromer or electroplex effects. Electromer and electroplex are suppressed completely by incorporating poly(n-vinylcarbazole) (PVK) in PTOA film.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the electroluminescence performances of blue polymer light emitting devices via carriers transporting materials incorporation

J of Applied Polymer Sci

Hsu

Chan

et al. 2008

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A series of polymer light emitting devices (PLEDs) based on the composite films of N-arylbenzimidazoles trimer (TPBI), poly (n-vinylcarbazole) (PVK), and a triarylaminooxadiazole-containing tetraphenylsilane light emitting polymer (PTOA) were investigated. Electroluminescence (EL) performance is enhanced with doped TPBI into the light-emitting layer for the PTOA-based devices. A deep blue emission (Commission Internationale de L'Eclairage (CIE x,y ) corodinates (0.16,0.06)) is obtained for the TPBI-PTOA-based device. Brightness and current efficiency of the TPBI-PTOA-based device can be as high as 961 cd/m 2 and 1.85 cd/A, respectively. The EL performances of TPBI-PTOA composite film-based devices are further enhanced by inserting a TPBI layer into the light emitting layer and cathode interface for a better electron and hole charge balance. Doping TPBI into the light-emitting layer of PVK-PTOA is not favorable for enhanced EL performances. Brightness and current efficiency reduced with increasing TPBI content for the TPBI-PVK-PTOA-based devices. Similar results are obtained for devices based on the TPBI-PVK-PTOA/TPBI bi-layer composite solid film. Morphology and charge balance effects on EL performances of TPBI-PTOA and TPBI-PVK-PTOA composite films based PLEDs are discussed in detail.

Synthesis of quaternized ammonium iodide‐containing conjugated polymer electrolytes and their application in dye‐sensitized solar cells

Liu

et al. 2010

Polymer International

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