The Experts below are selected from a list of 150 Experts worldwide ranked by ideXlab platform
Chihaya Adachi - One of the best experts on this subject based on the ideXlab platform.
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high efficiency deep blue organic light emitting diodes based on a thermally activated delayed fluorescence emitter
Journal of Materials Chemistry C, 2014Co-Authors: Qisheng Zhang, Shuping Huang, Chihaya Adachi, Masaki Aonuma, Tetsuya Nakagawa, Kazuhiro KuwabaraAbstract:Highly efficient deep-blue thermally activated delayed fluorescence (TADF) is observed from a charge-transfer compound bis[4-(3,6-dimethoxycarbazole)phenyl]Sulfone (DMOC-DPS). In comparison with the previously reported carbazole/Sulfone Derivative with tert-butyl substituents on the carbazole donors, DMOC-DPS exhibits a much shorter excited-state lifetime in both an aromatic solution and an organic thin film, because the change of the substituent on the donor affects the molecular energy levels of the first singlet (S1) and triplet (T1) excited states in different ways, decreasing the energy gap between S1 and T1 (ΔEST). An organic light emitting diode (OLED) based on DMOC-DPS achieves a maximum external electroluminescence quantum efficiency (EQE) of 14.5% and reduced efficiency roll-off, with Commission Internationale de L'Eclairage (CIE) coordinates of (0.16, 0.16), owing to efficient exciton harvesting that occurs through triplet-to-singlet up-conversion.
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design of efficient thermally activated delayed fluorescence materials for pure blue organic light emitting diodes
Journal of the American Chemical Society, 2012Co-Authors: Qisheng Zhang, Jie Li, Katsuyuki Shizu, Shuping Huang, Shuzo Hirata, Hiroshi Miyazaki, Chihaya AdachiAbstract:Efficient thermally activated delayed fluorescence (TADF) has been characterized for a carbazole/Sulfone Derivative in both solutions and doped films. A pure blue organic light emitting diode (OLED) based on this compound demonstrates a very high external quantum efficiency (EQE) of nearly 10% at low current density. Because TADF only occurs in a bipolar system where donor and acceptor centered 3ππ* states are close to or higher than the triplet intramolecular charge transfer (3CT) state, control of the π-conjugation length of both donor and acceptor is considered to be as important as breaking the π-conjugation between them in blue TADF material design.
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Design of Efficient Thermally Activated Delayed Fluorescence Materials for Pure Blue Organic Light Emitting Diodes
2012Co-Authors: Qisheng Zhang, Katsuyuki Shizu, Shuping Huang, Shuzo Hirata, Hiroshi Miyazaki, Chihaya AdachiAbstract:Efficient thermally activated delayed fluorescence (TADF) has been characterized for a carbazole/Sulfone Derivative in both solutions and doped films. A pure blue organic light emitting diode (OLED) based on this compound demonstrates a very high external quantum efficiency (EQE) of nearly 10% at low current density. Because TADF only occurs in a bipolar system where donor and acceptor centered 3ππ* states are close to or higher than the triplet intramolecular charge transfer (3CT) state, control of the π-conjugation length of both donor and acceptor is considered to be as important as breaking the π-conjugation between them in blue TADF material design
Qisheng Zhang - One of the best experts on this subject based on the ideXlab platform.
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high efficiency deep blue organic light emitting diodes based on a thermally activated delayed fluorescence emitter
Journal of Materials Chemistry C, 2014Co-Authors: Qisheng Zhang, Shuping Huang, Chihaya Adachi, Masaki Aonuma, Tetsuya Nakagawa, Kazuhiro KuwabaraAbstract:Highly efficient deep-blue thermally activated delayed fluorescence (TADF) is observed from a charge-transfer compound bis[4-(3,6-dimethoxycarbazole)phenyl]Sulfone (DMOC-DPS). In comparison with the previously reported carbazole/Sulfone Derivative with tert-butyl substituents on the carbazole donors, DMOC-DPS exhibits a much shorter excited-state lifetime in both an aromatic solution and an organic thin film, because the change of the substituent on the donor affects the molecular energy levels of the first singlet (S1) and triplet (T1) excited states in different ways, decreasing the energy gap between S1 and T1 (ΔEST). An organic light emitting diode (OLED) based on DMOC-DPS achieves a maximum external electroluminescence quantum efficiency (EQE) of 14.5% and reduced efficiency roll-off, with Commission Internationale de L'Eclairage (CIE) coordinates of (0.16, 0.16), owing to efficient exciton harvesting that occurs through triplet-to-singlet up-conversion.
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design of efficient thermally activated delayed fluorescence materials for pure blue organic light emitting diodes
Journal of the American Chemical Society, 2012Co-Authors: Qisheng Zhang, Jie Li, Katsuyuki Shizu, Shuping Huang, Shuzo Hirata, Hiroshi Miyazaki, Chihaya AdachiAbstract:Efficient thermally activated delayed fluorescence (TADF) has been characterized for a carbazole/Sulfone Derivative in both solutions and doped films. A pure blue organic light emitting diode (OLED) based on this compound demonstrates a very high external quantum efficiency (EQE) of nearly 10% at low current density. Because TADF only occurs in a bipolar system where donor and acceptor centered 3ππ* states are close to or higher than the triplet intramolecular charge transfer (3CT) state, control of the π-conjugation length of both donor and acceptor is considered to be as important as breaking the π-conjugation between them in blue TADF material design.
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Design of Efficient Thermally Activated Delayed Fluorescence Materials for Pure Blue Organic Light Emitting Diodes
2012Co-Authors: Qisheng Zhang, Katsuyuki Shizu, Shuping Huang, Shuzo Hirata, Hiroshi Miyazaki, Chihaya AdachiAbstract:Efficient thermally activated delayed fluorescence (TADF) has been characterized for a carbazole/Sulfone Derivative in both solutions and doped films. A pure blue organic light emitting diode (OLED) based on this compound demonstrates a very high external quantum efficiency (EQE) of nearly 10% at low current density. Because TADF only occurs in a bipolar system where donor and acceptor centered 3ππ* states are close to or higher than the triplet intramolecular charge transfer (3CT) state, control of the π-conjugation length of both donor and acceptor is considered to be as important as breaking the π-conjugation between them in blue TADF material design
Jan Fabris - One of the best experts on this subject based on the ideXlab platform.
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Highly Stereoselective Formal Synthesis of Rosuvastatin and Pitavastatin Through Julia–Kocienski Olefination Using the Lactonized Statin Side-Chain Precursor
Synthesis, 2014Co-Authors: Jan Fabris, Zdenko Časar, Ivana Gazic Smilovic, Martin ČrnugeljAbstract:An expedient and simple synthetic approach to pitavastatin and rosuvastatin final intermediates is described. The presented approach consists of completely stereoselective Julia–Kocienski olefination step (E/Z up to 300:1) between lactonized statin side-chain precursor and Sulfone Derivative of the corresponding pyrimidine and quinoline heterocyclic cores. The desired O-TBS protected statin lactones were isolated in 66–71% yield and high >97% purity (HPLC).
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highly stereoselective formal synthesis of rosuvastatin and pitavastatin through julia kocienski olefination using the lactonized statin side chain precursor
Synthesis, 2014Co-Authors: Jan Fabris, Ivana Gazic Smilovic, Zdenko Casar, Martin CrnugeljAbstract:An expedient and simple synthetic approach to pitavastatin and rosuvastatin final intermediates is described. The presented approach consists of completely stereoselective Julia–Kocienski olefination step (E/Z up to 300:1) between lactonized statin side-chain precursor and Sulfone Derivative of the corresponding pyrimidine and quinoline heterocyclic cores. The desired O-TBS protected statin lactones were isolated in 66–71% yield and high >97% purity (HPLC).
Shuping Huang - One of the best experts on this subject based on the ideXlab platform.
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high efficiency deep blue organic light emitting diodes based on a thermally activated delayed fluorescence emitter
Journal of Materials Chemistry C, 2014Co-Authors: Qisheng Zhang, Shuping Huang, Chihaya Adachi, Masaki Aonuma, Tetsuya Nakagawa, Kazuhiro KuwabaraAbstract:Highly efficient deep-blue thermally activated delayed fluorescence (TADF) is observed from a charge-transfer compound bis[4-(3,6-dimethoxycarbazole)phenyl]Sulfone (DMOC-DPS). In comparison with the previously reported carbazole/Sulfone Derivative with tert-butyl substituents on the carbazole donors, DMOC-DPS exhibits a much shorter excited-state lifetime in both an aromatic solution and an organic thin film, because the change of the substituent on the donor affects the molecular energy levels of the first singlet (S1) and triplet (T1) excited states in different ways, decreasing the energy gap between S1 and T1 (ΔEST). An organic light emitting diode (OLED) based on DMOC-DPS achieves a maximum external electroluminescence quantum efficiency (EQE) of 14.5% and reduced efficiency roll-off, with Commission Internationale de L'Eclairage (CIE) coordinates of (0.16, 0.16), owing to efficient exciton harvesting that occurs through triplet-to-singlet up-conversion.
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design of efficient thermally activated delayed fluorescence materials for pure blue organic light emitting diodes
Journal of the American Chemical Society, 2012Co-Authors: Qisheng Zhang, Jie Li, Katsuyuki Shizu, Shuping Huang, Shuzo Hirata, Hiroshi Miyazaki, Chihaya AdachiAbstract:Efficient thermally activated delayed fluorescence (TADF) has been characterized for a carbazole/Sulfone Derivative in both solutions and doped films. A pure blue organic light emitting diode (OLED) based on this compound demonstrates a very high external quantum efficiency (EQE) of nearly 10% at low current density. Because TADF only occurs in a bipolar system where donor and acceptor centered 3ππ* states are close to or higher than the triplet intramolecular charge transfer (3CT) state, control of the π-conjugation length of both donor and acceptor is considered to be as important as breaking the π-conjugation between them in blue TADF material design.
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Design of Efficient Thermally Activated Delayed Fluorescence Materials for Pure Blue Organic Light Emitting Diodes
2012Co-Authors: Qisheng Zhang, Katsuyuki Shizu, Shuping Huang, Shuzo Hirata, Hiroshi Miyazaki, Chihaya AdachiAbstract:Efficient thermally activated delayed fluorescence (TADF) has been characterized for a carbazole/Sulfone Derivative in both solutions and doped films. A pure blue organic light emitting diode (OLED) based on this compound demonstrates a very high external quantum efficiency (EQE) of nearly 10% at low current density. Because TADF only occurs in a bipolar system where donor and acceptor centered 3ππ* states are close to or higher than the triplet intramolecular charge transfer (3CT) state, control of the π-conjugation length of both donor and acceptor is considered to be as important as breaking the π-conjugation between them in blue TADF material design
Jie Li - One of the best experts on this subject based on the ideXlab platform.
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efficient management of excitons in red and white organic light emitting diodes by employing blue thermally activated delayed fluorescent emitter based acridine Sulfone Derivative as the host
Organic Electronics, 2018Co-Authors: Ziqi Wang, Heng Zhang, Zongtao Wang, Bo Zhao, Liuqing Chen, Jie Li, Hua Wang, Wenlian LiAbstract:Abstract Highly efficient red and white organic light-emitting diodes (OLEDs) employing blue thermally activated delayed fluorescent (TADF) emitter of mSOAD based acridine/Sulfone Derivative as the host are realized by efficient management for singlet and triplet excitons. The red OLEDs reach a high maximum current efficiency, power efficiency and EQE of 32.7 cd A−1, 31.0 lm W−1 and 20.3%, respectively. And the white OLEDs with different dopant concentrations exhibit ultra-high color stability of ±(0.008, 0.001), ±(0.000, 0.003) and ±(0.002, 0.005), respectively. Meantime, the high efficiencies are also achieved with maximum current efficiencies, power efficiencies and EQEs of 28.2–32.0 cd A−1, 26.3–30.5 lm W−1 and 12.2–17.4%, respectively. The analysis of energy level and transient decay characteristics demonstrate the excellent device performances are mainly stemmed from the sufficient confinement for charges and excitons and efficient energy transfer from the TADF host to dopant.
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design of efficient thermally activated delayed fluorescence materials for pure blue organic light emitting diodes
Journal of the American Chemical Society, 2012Co-Authors: Qisheng Zhang, Jie Li, Katsuyuki Shizu, Shuping Huang, Shuzo Hirata, Hiroshi Miyazaki, Chihaya AdachiAbstract:Efficient thermally activated delayed fluorescence (TADF) has been characterized for a carbazole/Sulfone Derivative in both solutions and doped films. A pure blue organic light emitting diode (OLED) based on this compound demonstrates a very high external quantum efficiency (EQE) of nearly 10% at low current density. Because TADF only occurs in a bipolar system where donor and acceptor centered 3ππ* states are close to or higher than the triplet intramolecular charge transfer (3CT) state, control of the π-conjugation length of both donor and acceptor is considered to be as important as breaking the π-conjugation between them in blue TADF material design.
