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Your search keyword '"Fang-Ming Hsu"' showing total 4 results
Start Over Author "Fang-Ming Hsu" Journal journal of materials chemistry
4 results on '"Fang-Ming Hsu"'

1. Efficient non-doped blue-light-emitting diodes incorporating an anthracene derivative end-capped with fluorene groups

Author

Fang-Ming Hsu, Ching-Fong Shu, Chen-Han Chien, Chen-Hao Wu, and Ping-I Shih

Subjects
Anthracene, Thermal decomposition, Analytical chemistry, Quantum yield, General Chemistry, Fluorene, Amorphous solid, law.invention, chemistry.chemical_compound, chemistry, law, Materials Chemistry, OLED, Quantum efficiency, Light-emitting diode
Abstract

We have synthesized and characterized a novel blue-emitting material, 2-tert-butyl-9,10-bis[4′-(9-p-tolyl-fluoren-9-yl)biphenyl-4-yl]anthracene (BFAn), containing an anthracene core end-capped with 9-phenyl-9-fluorenyl groups. The presence of the sterically congested fluorene groups imparts BFAn with a high thermal decomposition temperature (Td = 510 °C) and results in its forming a stable glass (Tg = 227 °C). Atomic force microscopy measurements revealed that BFAn forms high-quality amorphous films and possesses good morphological stability after annealing. Organic light-emitting diodes (OLEDs) featuring BFAn as the emitter exhibited an excellent external quantum efficiency of 5.1% (5.6 cd A−1) with Commission Internationale de L'Eclairage coordinates of (0.15, 0.12) that are very close to the National Television Standards Committee's blue standard. The power efficiency of our BFAn-based devices reached as high as 5.7 lm W−1, making them superior to other reported non-doped deep-blue OLEDs.

Published
2009

2. Highly efficient red electrophosphorescent device incorporating a bipolar triphenylamine/bisphenylsulfonyl-substituted fluorene hybrid as the host

Author

Chen-Hao Wu, Shun-Wei Liu, Ching-Fong Shu, Ya-Jou Hsieh, Chen-Han Chien, Chin-Ti Chen, and Fang-Ming Hsu

Subjects
Band gap, Doping, chemistry.chemical_element, General Chemistry, Electroluminescence, Fluorene, Photochemistry, Triphenylamine, chemistry.chemical_compound, Crystallography, chemistry, Materials Chemistry, Iridium, Phosphorescence, Diode
Abstract

We have fabricated highly efficient red phosphorescent organic light-emitting diodes (PHOLEDs) incorporating a bipolar host material, 2,7-bis(phenylsulfonyl)-9-[4-(N,N-diphenylamino)phenyl]-9-phenylfluorene (SAF), doped with 7 wt% tris(1-phenylisoquinolinolato-C2,N)iridium(III) [Ir(piq)3]. Attaching the electron-donating (p-type) triphenylamine group onto the electron-accepting (n-type) 2,7-bis(phenylsulfonyl)fluorene segment (through the C9 position of the fluorene unit) imparts SAF with good morphological stability, high triplet energy gap (ET), bipolar transporting ability, and matching energy levels with adjacent carrier-transporting layers. Consequently, the SAF-based red-PHOLED exhibited a very low turn-on voltage (2.4 V) and high electroluminescence efficiencies of 15.8% and 22.0 lm W−1, superior to those of the corresponding device incorporating a conventional host material, 4,4′-N,N′-dicarbazolbiphenyl (CBP; 3.2 V, 8.5%, and 8.4 lm W−1, respectively). At a practical brightness of 1000 cd m−2, the efficiencies of the SAF-based red-PHOLED remained high (13.1%, 14.4 lm W−1).

Published
2009

3. Highly efficient red electrophosphorescent device incorporating a bipolar triphenylamine/bisphenylsulfonyl-substituted fluorene hybrid as the host.

Author

Fang-Ming Hsu, Chen-Han Chien, Ya-Jou Hsieh, Chen-Hao Wu, Ching-Fong Shu, Shun-Wei Liu, and Chin-Ti Chen

Abstract

We have fabricated highly efficient red phosphorescent organic light-emitting diodes (PHOLEDs) incorporating a bipolar host material, 2,7-bis(phenylsulfonyl)-9-[4-(N,N-diphenylamino)phenyl]-9-phenylfluorene (SAF), doped with 7 wt% tris(1-phenylisoquinolinolato-C2,N)iridium(III) [Ir(piq)3]. Attaching the electron-donating (p-type) triphenylamine group onto the electron-accepting (n-type) 2,7-bis(phenylsulfonyl)fluorene segment (through the C9 position of the fluorene unit) imparts SAFwith good morphological stability, high triplet energy gap (ET), bipolar transporting ability, and matching energy levels with adjacent carrier-transporting layers. Consequently, the SAF-based red-PHOLED exhibited a very low turn-on voltage (2.4 V) and high electroluminescence efficiencies of 15.8% and 22.0 lm W−1, superior to those of the corresponding device incorporating a conventional host material, 4,4′-N,N′-dicarbazolbiphenyl (CBP; 3.2 V, 8.5%, and 8.4 lm W−1, respectively). At a practical brightness of 1000 cd m−2, the efficiencies of the SAF-based red-PHOLED remained high (13.1%, 14.4 lm W−1). [ABSTRACT FROM AUTHOR]

Published
2009
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4. Efficient non-doped blue-light-emitting diodes incorporating an anthracene derivative end-capped with fluorene groups.

Author

Chen-Hao Wu, Chen-Han Chien, Fang-Ming Hsu, Ping-I Shih, and Ching-Fong Shu

Abstract

We have synthesized and characterized a novel blue-emitting material, 2-tert-butyl-9,10-bis[4′-(9-p-tolyl-fluoren-9-yl)biphenyl-4-yl]anthracene (BFAn), containing an anthracene core end-capped with 9-phenyl-9-fluorenyl groups. The presence of the sterically congested fluorene groups imparts BFAnwith a high thermal decomposition temperature (Td= 510 °C) and results in its forming a stable glass (Tg= 227 °C). Atomic force microscopy measurements revealed that BFAnforms high-quality amorphous films and possesses good morphological stability after annealing. Organic light-emitting diodes (OLEDs) featuring BFAnas the emitter exhibited an excellent external quantum efficiency of 5.1% (5.6 cd A−1) with Commission Internationale de L'Eclairage coordinates of (0.15, 0.12) that are very close to the National Television Standards Committee's blue standard. The power efficiency of our BFAn-based devices reached as high as 5.7 lm W−1, making them superior to other reported non-doped deep-blue OLEDs. [ABSTRACT FROM AUTHOR]

Published
2009
Full Text
View/download PDF

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