1
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Zhu A, Pan J, Liu Y, Chen F, Ban X, Qiu S, Luo Y, Zhu Q, Yu J, Liu W. A novel dibenzimidazole-based fluorescent organic molecule as a turn-off fluorescent probe for Cr3+ ion with high sensitivity and quick response. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2020.127696] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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2
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Zhu C, Ji X, You D, Chen TL, Mu AU, Barker KP, Klivansky LM, Liu Y, Fang L. Extraordinary Redox Activities in Ladder-Type Conjugated Molecules Enabled by B ← N Coordination-Promoted Delocalization and Hyperconjugation. J Am Chem Soc 2018; 140:18173-18182. [PMID: 30507169 DOI: 10.1021/jacs.8b11337] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The introduction of B ← N coordinate bond-isoelectronic to C-C single bond-into π-systems represents a promising strategy to impart exotic redox and electrochromic properties into conjugated organic molecules and macromolecules. To achieve both reductive and oxidative activities using this strategy, a cruciform ladder-type molecular constitution was designed to accommodate oxidation-active, reduction-active, and B ← N coordination units into a compact structure. Two such compounds (BN-F and BN-Ph) were synthesized via highly efficient N-directed borylation. These molecules demonstrated well-separated, two reductive and two oxidative electron-transfer processes, corresponding to five distinct yet stable oxidation states, including a rarely observed boron-containing radical cation. Spectroelectrochemical measurements revealed unique optical characteristics for each of these reduced/oxidized species, demonstrating multicolor electrochromism with excellent recyclability. Distinct color changes were observed between each redox state with clear isosbestic points on the absorption spectra. The underlying redox mechanism was elucidated by a combination of computational and experimental investigations. Single-crystal X-ray diffraction analysis on the neutral state, the oxidized radical cation, and the reduced dianion of BN-Ph revealed structural transformations into two distinct quinonoid constitutions during the oxidation and reduction processes, respectively. B ← N coordination played an important role in rendering the robust and reversible multistage redox properties, by extending the charge and spin delocalization, by modulating the π-electron density, and by a newly established hyperconjugation mechanism.
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Affiliation(s)
| | | | | | - Teresa L Chen
- The Molecular Foundry , Lawrence Berkeley National Laboratory , One Cyclotron Road, Berkeley , California 94720 , United States
| | | | | | - Liana M Klivansky
- The Molecular Foundry , Lawrence Berkeley National Laboratory , One Cyclotron Road, Berkeley , California 94720 , United States
| | - Yi Liu
- The Molecular Foundry , Lawrence Berkeley National Laboratory , One Cyclotron Road, Berkeley , California 94720 , United States
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3
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Chen F, Wang S, Xiao Y, Peng F, Zhou N, Ying L, Li X. Alcohol-Soluble Electron-Transport Materials for Fully Solution-Processed Green PhOLEDs. Chem Asian J 2018; 13:1335-1341. [PMID: 29577626 DOI: 10.1002/asia.201800320] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2018] [Revised: 03/23/2018] [Indexed: 11/11/2022]
Abstract
Two alcohol-soluble electron-transport materials (ETMs), diphenyl(4-(1-phenyl-1H-benzo[d]imidazol-2-yl)phenyl)phosphine oxide (pPBIPO) and (3,5-bis(1-phenyl-1H-benzo[d]imidazol-2-yl)phenyl)diphenylphosphine oxide (mBPBIPO), have been synthesized. The physical properties of these ETMs were investigated and they both exhibited high electron-transport mobilities (1.67×10-4 and 2.15×10-4 cm2 V-1 s-1 ), high glass-transition temperatures (81 and 110 °C), and low LUMO energy levels (-2.87 and -2.82 eV, respectively). The solubility of PBIPO in n-butyl alcohol was more than 20 mg mL-1 , which meets the requirement for fully solution-processed organic light-emitting diodes (OLEDs). Fully solution-processed green-phosphorescent OLEDs were fabricated by using alcohol-soluble PBIPO as electron-transport layers (ETLs), and they exhibited high current efficiencies, power efficiencies, and external quantum efficiencies of up to 38.43 cd A-1 , 26.64 lm W-1 , and 10.87 %, respectively. Compared with devices that did not contain PBIPO as an ETM, the performance of these devices was much improved, which indicated the excellent electron-transport properties of PBIPO.
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Affiliation(s)
- Fudong Chen
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, P. R. China.,Collaborative Innovation Center of Chemical Science and Engineering, Tianjin, 300072, P. R. China
| | - Shirong Wang
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, P. R. China.,Collaborative Innovation Center of Chemical Science and Engineering, Tianjin, 300072, P. R. China
| | - Yin Xiao
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, P. R. China.,Collaborative Innovation Center of Chemical Science and Engineering, Tianjin, 300072, P. R. China
| | - Feng Peng
- Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, 510640, P. R. China
| | - Nonglin Zhou
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, P. R. China.,Collaborative Innovation Center of Chemical Science and Engineering, Tianjin, 300072, P. R. China
| | - Lei Ying
- Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, 510640, P. R. China
| | - Xianggao Li
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, P. R. China.,Collaborative Innovation Center of Chemical Science and Engineering, Tianjin, 300072, P. R. China
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4
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Ameen S, Lee SB, Lee YG, Yoon SC, Lee J, Lee C. 4-Diphenylaminocarbazole: Switching Substituent Position for Voltage Reduction and Efficiency Enhancement of OLEDs. ACS APPLIED MATERIALS & INTERFACES 2018; 10:8893-8900. [PMID: 29481052 DOI: 10.1021/acsami.7b18044] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Simple but exceptionally efficient 4-diphenylaminocarbazole host material, 4-DPACz, is presented and compared with its positional isomer, 1-DPACz. The shift of diphenylamino substituent from the 1-position to 4-position of carbazole resulted in an increase in the HOMO energy level as well as an increase in triplet energy level. Having a high triplet energy level (2.76 eV) and well-matched HOMO energy level (-5.61 eV), 4-DPACz showed reduced driving voltage and higher efficiencies for solution-processed green PhOLEDs compated to PVK as well as 1-DPACz. Maximum luminous, power, and external quantum efficiencies reaching to 47.9 cd A-1, 25.2 lm W-1, and 14.3%, respectively, were achieved with a device configuration of [ITO/PEDOT:PSS/4-DPACz:Ir(mppy)3/TPBi/CsF/Al]. Additional enhancement of efficiencies of 4-DPACz was verified when incorporating another dopant, Ir(Si-bppy)2(acac), resulting in 59.1 cd A-1, 29.5 lm W-1, and 15.8%. Furthermore, reduced efficiency roll-off was clearly observed for 4-DPACz compared with PVK. Such improved device characteristics of 4-DPACz were attributed to its high hole mobility and charge balance inside the emitting layer therof. The excellent results using such a simple-structured 4-DPACz could promote various applications of this 4-DPACz unit as a building block structure for further possible oligomeric, dendritic, and polymeric materials.
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Affiliation(s)
- Shahid Ameen
- Advanced Materials Division , Korea Research Institute of Chemical Technology , 141 Gajeong-ro, Yuseong-gu , Daejeon 34114 , Republic of Korea
- Department of Advanced Materials and Chemical Engineering , UST-KRICT School , 217 Gajeong-ro, Yuseong-gu , Daejeon 34114 , Republic of Korea
- Department of Chemistry , Kohat University of Science and Technology (KUST) , Kohat 26000 , Pakistan
| | - Seul Bee Lee
- Advanced Materials Division , Korea Research Institute of Chemical Technology , 141 Gajeong-ro, Yuseong-gu , Daejeon 34114 , Republic of Korea
- Department of Advanced Materials and Chemical Engineering , UST-KRICT School , 217 Gajeong-ro, Yuseong-gu , Daejeon 34114 , Republic of Korea
| | - Yong Guk Lee
- Advanced Materials Division , Korea Research Institute of Chemical Technology , 141 Gajeong-ro, Yuseong-gu , Daejeon 34114 , Republic of Korea
| | - Sung Cheol Yoon
- Advanced Materials Division , Korea Research Institute of Chemical Technology , 141 Gajeong-ro, Yuseong-gu , Daejeon 34114 , Republic of Korea
- Department of Advanced Materials and Chemical Engineering , UST-KRICT School , 217 Gajeong-ro, Yuseong-gu , Daejeon 34114 , Republic of Korea
| | - Jaemin Lee
- Advanced Materials Division , Korea Research Institute of Chemical Technology , 141 Gajeong-ro, Yuseong-gu , Daejeon 34114 , Republic of Korea
- Department of Advanced Materials and Chemical Engineering , UST-KRICT School , 217 Gajeong-ro, Yuseong-gu , Daejeon 34114 , Republic of Korea
| | - Changjin Lee
- Advanced Materials Division , Korea Research Institute of Chemical Technology , 141 Gajeong-ro, Yuseong-gu , Daejeon 34114 , Republic of Korea
- Department of Advanced Materials and Chemical Engineering , UST-KRICT School , 217 Gajeong-ro, Yuseong-gu , Daejeon 34114 , Republic of Korea
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Wang S, Lee CW, Lee JY, Hwang SH. Synthesis and green phosphorescent OLED device performance of cyanofluorene-linked phenylcarbazoles as host material. NEW J CHEM 2018. [DOI: 10.1039/c7nj03748a] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
A series of three isomeric bipolar host materials for green phosphorescent organic light-emitting diodes (PhOLEDs) was synthesized from a combination of cyanofluorene and N-phenylcarbazole moieties.
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Affiliation(s)
- Shuxin Wang
- Department of Polymer Science & Engineering
- Materials Chemistry & Engineering Laboratory
- Dankook University
- Yongin
- Korea
| | - Chil Won Lee
- Department of Chemistry
- Dankook University
- Chonan
- Korea
| | - Jun Yeob Lee
- School of Chemical Engineering
- Sungkyunkwan University
- Suwon
- Korea
| | - Seok-Ho Hwang
- Department of Polymer Science & Engineering
- Materials Chemistry & Engineering Laboratory
- Dankook University
- Yongin
- Korea
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6
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Konidena RK, Thomas KRJ. Star-Shaped Asymmetrically Substituted Blue Emitting Carbazoles: Synthesis, Photophyscial, Electrochemical and Theoretical Investigations. ChemistrySelect 2017. [DOI: 10.1002/slct.201701336] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Rajendra Kumar Konidena
- Organic Materials Laboratory, Department of Chemistry; Indian Institute of Technology Roorkee; Roorkee − 247667 India
| | - K. R. Justin Thomas
- Organic Materials Laboratory, Department of Chemistry; Indian Institute of Technology Roorkee; Roorkee − 247667 India
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7
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Bodedla GB, Thomas KRJ, Fan MS, Ho KC. Effect of Donors on Photophysical, Electrochemical and Photovoltaic Properties of Benzimidazole-Branched Dyes. ChemistrySelect 2017. [DOI: 10.1002/slct.201700014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Govardhana Babu Bodedla
- Organic Materials Chemistry, Department of Chemistry; Indian Institute of Technology Roorkee; Roorkee - 247 667 India
| | - K. R. Justin Thomas
- Organic Materials Chemistry, Department of Chemistry; Indian Institute of Technology Roorkee; Roorkee - 247 667 India
| | - Miao-Syuan Fan
- Department of Chemical Engineering; National Taiwan University; Taipei 10617 Taiwan
| | - Kuo-Chuan Ho
- Department of Chemical Engineering; National Taiwan University; Taipei 10617 Taiwan
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8
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Chen WC, Yuan Y, Ni SF, Zhu ZL, Zhang J, Jiang ZQ, Liao LS, Wong FL, Lee CS. Highly Efficient Deep-Blue Electroluminescence from a Charge-Transfer Emitter with Stable Donor Skeleton. ACS APPLIED MATERIALS & INTERFACES 2017; 9:7331-7338. [PMID: 28185447 DOI: 10.1021/acsami.6b14638] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Organic materials containing arylamines have been widely used as hole-transporting materials as well as emitters in organic light-emitting devices (OLEDs). However, it has been pointed out that the C-N bonds in these arylamines can easily suffer from degradation in excited states, especially in deep-blue OLEDs. In this work, phenanthro[9,10-d]imidazole (PI) is proposed as a potential donor with higher stability than those of arylamines. Using PI as the donor, a donor-acceptor type deep-blue fluorophore 1-phenyl-2-(4″-(1-phenyl-1H-benzo[d]imidazol-2-yl)-[1,1':4',1″-terphenyl]-4-yl)-1H-phenanthro[9,10-d]imidazole (BITPI) is designed and synthesized. Results from UV-aging test on neat films of BITPI and other three arylamine compounds demonstrate that PI is indeed a more stable donor comparing to common arylamines. An OLED using BITPI as an emitter exhibits good device performances (EQE over 7%) with stable deep-blue emission (color index: (0.15, 0.13)) and longer operation lifetime than the similarly structured device using arylamine-based emitter. Single-organic layer device based on BITPI also shows superior performances, which are comparable to the best results from the arylamine-based donor-acceptor emitters, suggesting that PI is a stable donor with good hole transport/injection capability.
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Affiliation(s)
- Wen-Cheng Chen
- Center of Super-Diamond and Advanced Films (COSDAF) and Department of Biology and Chemistry, City University of Hong Kong , Hong Kong SAR, PR China
| | - Yi Yuan
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM) & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University , Suzhou 215123, PR China
| | - Shao-Fei Ni
- Department of Chemistry, Southern University of Science and Technology , Shenzhen 518055, PR China
| | - Ze-Lin Zhu
- Center of Super-Diamond and Advanced Films (COSDAF) and Department of Biology and Chemistry, City University of Hong Kong , Hong Kong SAR, PR China
| | - Jinfeng Zhang
- Center of Super-Diamond and Advanced Films (COSDAF) and Department of Biology and Chemistry, City University of Hong Kong , Hong Kong SAR, PR China
| | - Zuo-Quan Jiang
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM) & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University , Suzhou 215123, PR China
| | - Liang-Sheng Liao
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM) & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University , Suzhou 215123, PR China
| | - Fu-Lung Wong
- Center of Super-Diamond and Advanced Films (COSDAF) and Department of Biology and Chemistry, City University of Hong Kong , Hong Kong SAR, PR China
| | - Chun-Sing Lee
- Center of Super-Diamond and Advanced Films (COSDAF) and Department of Biology and Chemistry, City University of Hong Kong , Hong Kong SAR, PR China
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9
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Sun M, Yue S, Cao H, Ou C, Qian Y, Wang T, Chen L, Zhao Y, Huang W. Selective Introduction of Carbazole and Diphenylamine into Spirofluorenexanthene Core for Different Phosphorescent Hosts. CHINESE J CHEM 2016. [DOI: 10.1002/cjoc.201600203] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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10
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Tian G, Wei X, Xiang N, Huang J, Cao J, Wang Z, Zhang J, Su J. Small organic molecules based on oxazole/thiazole with excellent performances in green and red phosphorescent organic light-emitting diodes. RSC Adv 2016. [DOI: 10.1039/c6ra07976h] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Four small organic host materials based on oxazole/thiazole have been synthesized and fully characterized. The best performance of compound 2d was a maximum current efficiency of 50.7 cd A−1 for green device and a maximum current efficiency of 18.7 cd A−1 for red device.
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Affiliation(s)
- Guojian Tian
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals
- East China University of Science and Technology
- Shanghai 200237
- PR China
| | - Xiang Wei
- Key Laboratory of Advanced Display and System Applications
- Ministry of Education
- Shanghai University
- Shanghai 200072
- PR China
| | - Ning Xiang
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals
- East China University of Science and Technology
- Shanghai 200237
- PR China
| | - Jinhai Huang
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals
- East China University of Science and Technology
- Shanghai 200237
- PR China
| | - Jin Cao
- Key Laboratory of Advanced Display and System Applications
- Ministry of Education
- Shanghai University
- Shanghai 200072
- PR China
| | - Zixing Wang
- Key Laboratory of Advanced Display and System Applications
- Ministry of Education
- Shanghai University
- Shanghai 200072
- PR China
| | - Jianhua Zhang
- Key Laboratory of Advanced Display and System Applications
- Ministry of Education
- Shanghai University
- Shanghai 200072
- PR China
| | - Jianhua Su
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals
- East China University of Science and Technology
- Shanghai 200237
- PR China
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11
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Jiang W, Ban X, Sun Y. Enhanced electron affinity and charge balance property of a bipolar material: highly efficient solution-processed deep blue electrofluorescent and green electrophosphorescent devices. RSC Adv 2015. [DOI: 10.1039/c5ra12377a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The slight move in the ratio of the donor and acceptor group can slightly affect the optoelectronic property as a whole, and consequently modulate the electron affinity, charge balance property and exciton recombination efficiency.
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Affiliation(s)
- Wei Jiang
- School of Chemistry and Chemical Engineering
- Southeast University
- Nanjing
- P. R. China 211189
| | - Xinxin Ban
- School of Chemistry and Chemical Engineering
- Southeast University
- Nanjing
- P. R. China 211189
| | - Yueming Sun
- School of Chemistry and Chemical Engineering
- Southeast University
- Nanjing
- P. R. China 211189
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12
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Bodedla GB, Justin Thomas KR, Kumar S, Jou JH, Li CJ. Phenothiazine-based bipolar green-emitters containing benzimidazole units: synthesis, photophysical and electroluminescence properties. RSC Adv 2015. [DOI: 10.1039/c5ra18372c] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
A series of bipolar green emitters bearing hole-transporting phenothiazine and electron-transporting N-phenylbenzimidazole are synthesized and characterized by their photophysical, electrochemical and thermal properties.
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Affiliation(s)
- Govardhana Babu Bodedla
- Organic Materials Chemistry
- Department of Chemistry
- Indian Institute of Technology Roorkee
- Roorkee 247667
- India
| | - K. R. Justin Thomas
- Organic Materials Chemistry
- Department of Chemistry
- Indian Institute of Technology Roorkee
- Roorkee 247667
- India
| | - Sandeep Kumar
- Organic Materials Chemistry
- Department of Chemistry
- Indian Institute of Technology Roorkee
- Roorkee 247667
- India
| | - Jwo-Huei Jou
- Department of Material Science and Engineering
- National Tsing Hua University
- Hsinchu 30013
- Taiwan
| | - Chieh-Ju Li
- Department of Material Science and Engineering
- National Tsing Hua University
- Hsinchu 30013
- Taiwan
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13
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Zhang Z, Jiang W, Ban X, Yang M, Ye S, Huang B, Sun Y. Solution-processed efficient deep-blue fluorescent organic light-emitting diodes based on novel 9,10-diphenyl-anthracene derivatives. RSC Adv 2015. [DOI: 10.1039/c5ra00627a] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Carbazole substituted 9,10-diphenyl-anthracene derivatives used in deep-blue fluorescence OLED materials with excellent performance.
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Affiliation(s)
- Zhaohang Zhang
- School of Chemistry and Chemical Engineering
- Southeast University
- Nanjing
- P. R. China
| | - Wei Jiang
- School of Chemistry and Chemical Engineering
- Southeast University
- Nanjing
- P. R. China
| | - Xinxin Ban
- School of Chemistry and Chemical Engineering
- Southeast University
- Nanjing
- P. R. China
| | - Min Yang
- Institute of Advanced Materials (IAM)
- Nanjing University of Posts & Telecommunications (NUPT)
- Nanjing
- P. R. China
| | - Shanghui Ye
- Institute of Advanced Materials (IAM)
- Nanjing University of Posts & Telecommunications (NUPT)
- Nanjing
- P. R. China
| | - Bin Huang
- School of Chemistry and Chemical Engineering
- Southeast University
- Nanjing
- P. R. China
| | - Yueming Sun
- School of Chemistry and Chemical Engineering
- Southeast University
- Nanjing
- P. R. China
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