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Lee Y.-T.,Academia Sinica, Taiwan | Lee Y.-T.,National Taiwan University | Chang Y.-T.,Academia Sinica, Taiwan | Lee M.-T.,AUO Optronics Corporation | And 3 more authors.
Journal of Materials Chemistry C | Year: 2014

Three new solution processable small molecular host materials based on the bis-[3,5-di(9H-carbazol-9-yl)phenyl] structural moiety have been developed for blue phosphorescent (FIrpic dopant) organic light-emitting diodes. All three host materials have been characterized as having high glass transition temperatures (Tgs), 155-175 °C, indicative of good morphological stability of their amorphous thin films prepared from the solution process. Whereas N,N-bis-[3,5-di(9H-carbazol-9-yl)phenyl]methylamine (CzPAMe) has the highest solid state triplet energy gap (ET) of 2.73 eV, tetrakis-[3,3′,5,5′-(9H-carbazol-9-yl)]triphenylphosphine oxide (CzPPO) and N,N-bis-[3,5-di(9H-carbazol-9-yl)phenyl]pyrimidin-2-amine (CzPAPm) are two host materials which are potentially bipolar for charge transport due to the electron deficient units of phenylphosphine oxide and pyrimidine, respectively. Due to the insufficient ET (2.56 eV) of CzPAPm, CzPPO or CzPAMe devices are significantly better than CzPAPm devices with or without a 1,3-bis[(4-tert-butylphenyl)-1,3,4-oxadiazolyl]phenylene (OXD-7) co-host. Particularly, having no OXD-7 co-host and no vacuum thermal-deposited extra electron transporting layer, single-layer devices of CzPPO surpass CzPAMe devices and reach current efficiencies as high as 9.32 cd A-1 (or power efficiency of 4.97 lm W-1), one of the highest efficiencies among small molecular devices with the same fabrication process and same device configuration. This journal is © The Royal Society of Chemistry. Source


Li C.-H.,National Taiwan University of Science and Technology | Yang C.-Y.,National Taiwan University of Science and Technology | Chang Y.-C.,National Taiwan University of Science and Technology | Chiu H.-J.,National Taiwan University of Science and Technology | And 7 more authors.
ICALIP 2012 - 2012 International Conference on Audio, Language and Image Processing, Proceedings | Year: 2012

This paper presents a module-integrated isolated solar micro-inverter. The studied grid-tied micro-inverters can individually extract the maximum solar power from each photovoltaic (PV) panel and transfer to the AC utility system. A harmonic suppression technique is used to reduce the DC-bus capacitance. Electrolytic capacitors are not needed in the studied solar micro-inverter. High conversion efficiency, high MPPT accuracy and long lifespan can be achieved. The operation principles and design considerations of the studied PV inverter are analyzed and discussed. A laboratory prototype is implemented and tested to verify its feasibility. © 2012 IEEE. Source


Yang C.-Y.,National Taiwan University of Science and Technology | Chang Y.-C.,National Taiwan University of Science and Technology | Li C.-H.,National Taiwan University of Science and Technology | Cheng S.-J.,National Taiwan University of Science and Technology | And 8 more authors.
IEEE International Conference on Industrial Informatics (INDIN) | Year: 2012

This paper presents a module-integrated isolated solar micro-inverter with pseudo-DC link. The studied grid-tied micro-inverters can individually extract the maximum solar power from each photovoltaic (PV) panel and transfer to the AC utility system. High conversion efficiency and high maximum power point tracking (MPPT) accuracy can be achieved with the studied pseudo-DC link topology. The operation principles and design considerations of the studied solar inverter are analyzed and discussed. A laboratory prototype is implemented and tested to verify its feasibility. © 2012 IEEE. Source


Chiu H.-J.,National Taiwan University of Science and Technology | Lo Y.-K.,National Taiwan University of Science and Technology | Chuang C.-C.,National Taiwan University of Science and Technology | Yang C.-Y.,National Taiwan University of Science and Technology | And 5 more authors.
International Journal of Circuit Theory and Applications | Year: 2014

This paper presents a module-integrated isolated solar micro-inverter. The studied grid-tied micro-inverters can individually extract the maximum solar power from each photovoltaic (PV) panel and transfer to the AC utility system. A harmonic suppression technique is used to reduce the DC-bus capacitance. Electrolytic capacitors are not needed in the studied solar micro-inverter. High conversion efficiency, high maximum power point tracking accuracy and long lifespan can be achieved. The operation principles and design considerations of the studied PV inverter are analyzed and discussed. A laboratory prototype is implemented and tested to verify its feasibility. Copyright © 2012 John Wiley & Sons, Ltd. Source

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