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Yamamoto S, Yasuda T, Kanbara T, Kuwabara J. Facile Synthesis of 1,7-Phenanthroline Derivatives and Evaluation of Their Properties as Hole-Blocking Materials in Organic Light-Emitting Diodes. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2022. [DOI: 10.1246/bcsj.20210461] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Sachie Yamamoto
- Tsukuba Research Center for Energy Materials Science (TREMS), Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan
| | - Takeshi Yasuda
- Research Center for Functional Materials, National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan
| | - Takaki Kanbara
- Tsukuba Research Center for Energy Materials Science (TREMS), Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan
| | - Junpei Kuwabara
- Tsukuba Research Center for Energy Materials Science (TREMS), Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan
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Frohleiks J, Wepfer S, Bacher G, Nannen E. Realization of Red Iridium-Based Ionic Transition Metal Complex Light-Emitting Electrochemical Cells (iTMC-LECs) by Interface-Induced Color Shift. ACS APPLIED MATERIALS & INTERFACES 2019; 11:22612-22620. [PMID: 31244025 DOI: 10.1021/acsami.9b07019] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Red ionic iridium-based transition metal complex light-emitting electrochemical cells (iTMC-LECs) with emission centered at ca. 650 nm, maximum efficiency of 0.3%, maximum brightness above 650 cd m-2, and device lifetime well above 200 and 33 h at brightness levels of 10 and 210 cd m-2, respectively, are realized by the introduction of a p-type polymer interface to the standard design of [Ir(ppy)2(pbpy)]+[PF6]- (Hppy = 2-phenylpyridine, pbpy = 6-phenyl-2,2'-bipyridine) iTMC-LEC. The unexpected color shift from yellow to red is studied in detail with respect to operation conditions and material combination. The experimental data suggest that either exciplex formation or subordinate, usually suppressed optical transitions of the iTMC might become activated by the introduced interface, causing the pronounced red shift of the peak emission wavelength.
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Affiliation(s)
| | | | | | - Ekaterina Nannen
- Faculty of Electrical Engineering and Computer Science, Textile Innovatory , University of Applied Sciences Niederrhein , 47805 Krefeld , Germany
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Frohleiks J, Gellner S, Wepfer S, Bacher G, Nannen E. Design and Realization of White Quantum Dot Light-Emitting Electrochemical Cell Hybrid Devices. ACS APPLIED MATERIALS & INTERFACES 2018; 10:42637-42646. [PMID: 30450895 DOI: 10.1021/acsami.8b15100] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The simple device architecture as well as the solution-based processing makes light-emitting electrochemical cells (LECs) a promising device concept for large-area flexible lighting solutions. The lack of deep-blue emitters, which are, at the same time, efficient, bright, and long-term stable, complementary to the wide variety of yellow-orange-emitting LECs, hampers the creation of white LECs. We present a hybrid device concept for the realization of white light emission by combining blue colloidal quantum dots (QDs) and an Ir-based ionic transition-metal complex (iTMC) LEC in a new type of white QD-LEC hybrid device (QLEC). By careful arrangement of the active layers, we yield light emission from both the blue QDs and the yellow iTMC emitter already at voltages below 3 V. The QLEC devices show homogeneous white light emission with high color rendering index (up to 80), luminance levels above 850 cd m-2, and a maximum external quantum efficiency greater than 0.2%.
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Affiliation(s)
- Julia Frohleiks
- Research Group "Solid State Lighting", NanoEnergieTechnikZentrum , University of Duisburg-Essen , Carl-Benz-Str. 199 , 47057 Duisburg , Germany
- Werkstoffe der Elektrotechnik and CENIDE , University of Duisburg-Essen , Bismarckstr. 81 , 47057 Duisburg , Germany
| | - Sandra Gellner
- Research Group "Solid State Lighting", NanoEnergieTechnikZentrum , University of Duisburg-Essen , Carl-Benz-Str. 199 , 47057 Duisburg , Germany
- Werkstoffe der Elektrotechnik and CENIDE , University of Duisburg-Essen , Bismarckstr. 81 , 47057 Duisburg , Germany
| | - Svenja Wepfer
- Research Group "Solid State Lighting", NanoEnergieTechnikZentrum , University of Duisburg-Essen , Carl-Benz-Str. 199 , 47057 Duisburg , Germany
- Werkstoffe der Elektrotechnik and CENIDE , University of Duisburg-Essen , Bismarckstr. 81 , 47057 Duisburg , Germany
| | - Gerd Bacher
- Werkstoffe der Elektrotechnik and CENIDE , University of Duisburg-Essen , Bismarckstr. 81 , 47057 Duisburg , Germany
| | - Ekaterina Nannen
- Research Group "Solid State Lighting", NanoEnergieTechnikZentrum , University of Duisburg-Essen , Carl-Benz-Str. 199 , 47057 Duisburg , Germany
- Werkstoffe der Elektrotechnik and CENIDE , University of Duisburg-Essen , Bismarckstr. 81 , 47057 Duisburg , Germany
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Yang W, Wang X, Wang S, Hao W. White-light-emitting hybrid film from fluorescent hyperbranched poly(amido amine). J Appl Polym Sci 2017. [DOI: 10.1002/app.46015] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Wen Yang
- Department of Polymer Material and Engineering; Hefei University of Technology; Hefei 230009 People's Republic of China
| | - Xiaomin Wang
- Department of Polymer Material and Engineering; Hefei University of Technology; Hefei 230009 People's Republic of China
- Chery Automobile Co., Ltd.; Wuhu 241009 People's Republic of China
| | - Shengnan Wang
- Department of Polymer Material and Engineering; Hefei University of Technology; Hefei 230009 People's Republic of China
| | - Wentao Hao
- Department of Polymer Material and Engineering; Hefei University of Technology; Hefei 230009 People's Republic of China
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Ban X, Jiang W, Sun K, Lin B, Sun Y. Self-Host Blue Dendrimer Comprised of Thermally Activated Delayed Fluorescence Core and Bipolar Dendrons for Efficient Solution-Processable Nondoped Electroluminescence. ACS APPLIED MATERIALS & INTERFACES 2017; 9:7339-7346. [PMID: 28192659 DOI: 10.1021/acsami.6b14922] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A self-host thermally activated delayed fluorescence (TADF) dendrimer POCz-DPS for solution-processed nondoped blue organic light-emitting diodes (OLEDs) was designed and synthesized, in which the bipolar phosphine oxide carbazole moiety was introduced by alkyl chain to ensure balanced charge transfer. The investigation of physical properties showed that the bipolar dendrons not only improve the morphological stability but also restrain the concentration quenching effect of the TADF emissive core. The spin-coated OLEDs featuring POCz-DPS as the host-free blue emitter achieved the highest external quantum efficiency (7.3%) and color purity compared with those of doped or nondoped devices based on the parent molecule DMOC-DPS, which indicates that incorporating the merits of encapsulation and bipolar dendron is an effective way to improve the electroluminescent performance of the TADF emitter used for a solution-processed nondoped device.
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Affiliation(s)
- Xinxin Ban
- School of Chemistry and Chemical Engineering, Southeast University , Nanjing, Jiangsu 211189, PR China
- School of Chemical Engineering, Huaihai Institute of Technology , Lianyungang 222005, China
| | - Wei Jiang
- School of Chemistry and Chemical Engineering, Southeast University , Nanjing, Jiangsu 211189, PR China
| | - Kaiyong Sun
- School of Chemistry and Chemical Engineering, Southeast University , Nanjing, Jiangsu 211189, PR China
| | - Baoping Lin
- School of Chemistry and Chemical Engineering, Southeast University , Nanjing, Jiangsu 211189, PR China
| | - Yueming Sun
- School of Chemistry and Chemical Engineering, Southeast University , Nanjing, Jiangsu 211189, PR China
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Stolz S, Zhang Y, Lemmer U, Hernandez-Sosa G, Aziz H. Degradation Mechanisms in Organic Light-Emitting Diodes with Polyethylenimine as a Solution-Processed Electron Injection Layer. ACS APPLIED MATERIALS & INTERFACES 2017; 9:2776-2785. [PMID: 28032974 DOI: 10.1021/acsami.6b15062] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
In this work, we investigate the performance and operational stability of solution-processed organic light-emitting diodes (OLEDs), which comprise polyethylenimine (PEI) as an electron injection layer (EIL). We show that the primary degradation mechanism in these OLEDs depends on the cathode metal that is used in contact with the EIL. In the case of Al, the deterioration in OLED performance during electrical driving is mainly caused by excitons which reach and subsequently degrade the emitter/PEI interface. In contrast, in the case of Ag, device performance degradation occurs due to an additional mechanism: hole accumulation at the emitter/PEI interface and a consequent drop in the emitter quantum yield. As a result, the operational lifetime of OLEDs that use PEI as EIL can vary significantly with the cathode material, and at a current density of 20 mA cm-2, LT50 lifetimes of ∼200 h and <10 h are obtained for Al and Ag, respectively. Finally, we show that the first degradation mechanism can be significantly slowed by using a mixture of PEI and ZnO nanoparticles as EIL. As a result, the operational lifetime of OLEDs with an Al cathode is increased to more than 1000 h, without adversely affecting device performance. This lifetime is significantly longer than that of a LiF/Al reference OLED.
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Affiliation(s)
- Sebastian Stolz
- Karlsruhe Institute of Technology , Light Technology Institute, Engesserstr. 13, 76131 Karlsruhe, Germany
- InnovationLab, Speyerer Str. 4, 69115 Heidelberg, Germany
| | - Yingjie Zhang
- University of Waterloo , Department of Electrical and Computer Engineering & Waterloo Institute for Nanotechnology, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada
| | - Uli Lemmer
- Karlsruhe Institute of Technology , Light Technology Institute, Engesserstr. 13, 76131 Karlsruhe, Germany
- Karlsruhe Institute of Technology , Institute of Microstructure Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Gerardo Hernandez-Sosa
- Karlsruhe Institute of Technology , Light Technology Institute, Engesserstr. 13, 76131 Karlsruhe, Germany
- InnovationLab, Speyerer Str. 4, 69115 Heidelberg, Germany
| | - Hany Aziz
- University of Waterloo , Department of Electrical and Computer Engineering & Waterloo Institute for Nanotechnology, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada
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Ma H, Cao H, Lei L, Yang Z, Yang M, Qin Y, Ma Y, Guan X, Lu D, Lei Z. A direct crossed polymerization of triphenylamines and cyclohexanones via CC bond formation: the method and its bioimaging application. NEW J CHEM 2017. [DOI: 10.1039/c7nj01407d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Fluorescent polymers synthesized by ACC reactions with interesting optical performances and the potential cell imaging applications.
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