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Konidena RK, Justin Thomas KR, Park JW. Recent Advances in the Design of Multi‐Substituted Carbazoles for Optoelectronics: Synthesis and Structure‐Property Outlook. CHEMPHOTOCHEM 2022. [DOI: 10.1002/cptc.202200059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
| | - K R Justin Thomas
- Indian Institute of Technology Roorkee Department of Chemistry Haridwar Road 247667 Roorkee INDIA
| | - Jong Wook Park
- Kyunghee University College of Engineering Chemical Engineering INDIA
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Sharma CP, Gupta NM, Singh J, Yadav RAK, Dubey DK, Rawat KS, Jha AK, Jou JH, Goel A. Synthesis of Solution-Processable Donor-Acceptor Pyranone Dyads for White Organic Light-Emitting Devices. J Org Chem 2019; 84:7674-7684. [PMID: 31117555 DOI: 10.1021/acs.joc.9b00293] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A series of donor-acceptor pyranones (3a-m, 4a-h) were synthesized using α-oxo-ketene- S, S-acetal as the synthon for their application as emissive materials for energy-saving organic light-emitting devices (OLEDs). Among them, five pyranones 3f, 3g, 3h, 3m, and 4e exhibited highly bright fluorescence in the solid state and weak or no emission in the solution state. Photophysical analysis of these dyes revealed that only 3f and 3m showed aggregation-induced emission behavior in a THF/water mixture (0-99%) with varying water fractions ( fw) leading to bright fluorescence covering the entire visible region, while other derivatives 3g, 3h, and 4e did not show any fluorescence signal. The computational studies of the compounds revealed that the longer wavelength absorption originates from HOMO to LUMO electronic excitation. These dyes exhibited good thermal stability with 5% weight loss temperature in the range of 218-347 °C. The potential application of the donor-acceptor pyranone dyads was demonstrated by fabrication of solution-processed OLEDs. Remarkably, OLED devices prepared using highly emissive compounds 6-(anthracen-9-yl)-4-(methylthio)-2-oxo-2 H-pyran-3-carbonitrile (3m) and 6-(4-methoxyphenyl)-4-(methylthio)-2-oxo-2 H-pyran-3-carbonitrile (3f) displayed pure white emission with CIE coordinates of (0.29, 0.31) and (0.32, 0.32), respectively. Additionally, the resultant devices exhibited external quantum efficiencies of 1.9 and 1.2% at 100 cd m-2, respectively.
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Affiliation(s)
- Chandra P Sharma
- Fluorescent Chemistry Lab, Medicinal and Process Chemistry Division , CSIR-Central Drug Research Institute , Lucknow 226031 , India
| | - Neeraj M Gupta
- Fluorescent Chemistry Lab, Medicinal and Process Chemistry Division , CSIR-Central Drug Research Institute , Lucknow 226031 , India
| | - Jagriti Singh
- Fluorescent Chemistry Lab, Medicinal and Process Chemistry Division , CSIR-Central Drug Research Institute , Lucknow 226031 , India
| | - Rohit Ashok Kumar Yadav
- Department of Materials Science and Engineering , National Tsing Hua University , Hsinchu , Taiwan 30013 , Republic of China
| | - Deepak Kumar Dubey
- Department of Materials Science and Engineering , National Tsing Hua University , Hsinchu , Taiwan 30013 , Republic of China
| | - Kundan S Rawat
- Fluorescent Chemistry Lab, Medicinal and Process Chemistry Division , CSIR-Central Drug Research Institute , Lucknow 226031 , India.,Academy of Scientific and Innovative Research , Ghaziabad 201002 , India
| | - Ajay K Jha
- Fluorescent Chemistry Lab, Medicinal and Process Chemistry Division , CSIR-Central Drug Research Institute , Lucknow 226031 , India
| | - Jwo-Huei Jou
- Department of Materials Science and Engineering , National Tsing Hua University , Hsinchu , Taiwan 30013 , Republic of China
| | - Atul Goel
- Fluorescent Chemistry Lab, Medicinal and Process Chemistry Division , CSIR-Central Drug Research Institute , Lucknow 226031 , India.,Academy of Scientific and Innovative Research , Ghaziabad 201002 , India
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De J, Yang WY, Bala I, Gupta SP, Yadav RAK, Dubey DK, Chowdhury A, Jou JH, Pal SK. Room-Temperature Columnar Liquid Crystals as Efficient Pure Deep-Blue Emitters in Organic Light-Emitting Diodes with an External Quantum Efficiency of 4.0. ACS APPLIED MATERIALS & INTERFACES 2019; 11:8291-8300. [PMID: 30707013 DOI: 10.1021/acsami.8b18749] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
A novel design of aggregation-induced emission (AIE) active columnar (Col) luminomesogens is reported, and they are demonstrated to act as highly efficient deep-blue emitters in organic light-emitting diodes (OLEDs). All derivatives exhibit Col liquid crystalline (LC) behavior at room temperature over a wide temperature range and desirable alignment properties, which is very important in using them as materials for organic electronic devices. These new AIE active luminomesogens were found to act as highly efficient emitters in OLEDs and unveiled a maximum external quantum efficiency of 4.0% for the first time in Col LCs with Commission International de l'E'clairage coordinates of (0.17, 0.07), which closely matches the National Television System Committee (NTSC) standard, corresponding to pure deep blue color. The detailed supramolecular assembly of the compounds has been characterized by modeling in the mesophase derived from small- and wide-angle X-ray scattering results.
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Affiliation(s)
- Joydip De
- Department of Chemical Sciences , Indian Institute of Science Education and Research (IISER) Mohali , Sector-81, SAS Nagar, Knowledge City , Manauli 140306 , India
| | - Wan-Yun Yang
- Department of Materials Science and Engineering , National Tsing Hua University , Hsinchu 30013 , Taiwan
| | - Indu Bala
- Department of Chemical Sciences , Indian Institute of Science Education and Research (IISER) Mohali , Sector-81, SAS Nagar, Knowledge City , Manauli 140306 , India
| | | | - Rohit Ashok Kumar Yadav
- Department of Materials Science and Engineering , National Tsing Hua University , Hsinchu 30013 , Taiwan
| | - Deepak Kumar Dubey
- Department of Materials Science and Engineering , National Tsing Hua University , Hsinchu 30013 , Taiwan
| | - Arjun Chowdhury
- Department of Chemical Sciences , Indian Institute of Science Education and Research (IISER) Mohali , Sector-81, SAS Nagar, Knowledge City , Manauli 140306 , India
| | - Jwo-Huei Jou
- Department of Materials Science and Engineering , National Tsing Hua University , Hsinchu 30013 , Taiwan
| | - Santanu Kumar Pal
- Department of Chemical Sciences , Indian Institute of Science Education and Research (IISER) Mohali , Sector-81, SAS Nagar, Knowledge City , Manauli 140306 , India
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