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Robust luminogens as cutting-edge tools for efficient light emission in recent decades.
Phys Chem Chem Phys
May 2024
Department of Chemistry, Annamalai University, Annamalainagar, Tamilnadu-608 002, India.
Blue luminogens play a vital role in white lighting and potential metal-free fluorescent materials and their high-lying excited states contribute to harvesting triplet excitons in devices. However, in TADF-OLEDs (Δ < 0.1 eV), although T excitons transfer to S RISC with 100% IQE, the longer lifetime of blue TADF suffers from efficiency roll-off (RO).
View Article and Find Full Text PDFA Review of Benzophenone-Based Derivatives for Organic Light-Emitting Diodes.
Nanomaterials (Basel)
February 2024
Department of Polymer Chemistry and Technology, Kaunas University of Technology, Radvilenu Plentas 19, LT50254 Kaunas, Lithuania.
Organic light-emitting diodes (OLEDs) have garnered considerable attention in academic and industrial circles due to their potential applications in flat-panel displays and solid-state lighting technologies, leveraging the advantages offered by organic electroactive derivatives over their inorganic counterparts. The thin and flexible design of OLEDs enables the development of innovative lighting solutions, facilitating the creation of customizable and contoured lighting panels. Among the diverse electroactive components employed in the molecular design of OLED materials, the benzophenone core has attracted much attention as a fragment for the synthesis of organic semiconductors.
View Article and Find Full Text PDFExploring Efficient Dual-Phase Emissive Fluorophores with High Mobility by Integrating a Rigid Donor and Flexible Acceptor.
ACS Appl Mater Interfaces
February 2024
Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science & Technology, Shanghai 200237, P. R. China.
Developing luminogens with a high emission efficiency in both single-molecule and aggregate states, as well as high mobility, shows promise for advancing the iteration and update of organic optoelectronic materials. However, achieving a delicate balance between the plane configuration of luminophores and the strong exciton interactions of aggregates is a formidable task from the molecular design perspective. This dilemma was overcome by integrating a rigid donor and flexible acceptor to establish donor-acceptor (D-A) type emitters.
View Article and Find Full Text PDFConversion of Ketones into Blue-Emitting Electron-Deficient Benzofurans.
Chemistry
April 2023
Institute of Organic Chemistry of Polish Academy of Sciences, Kasprzaka 44/52, 01-224, Warsaw, Poland.
A novel heavy metal-free and safe synthetic methodology enabling one-step conversion of ketones into corresponding 4,5,6,7-tetrafluorobenzofurans (F BFs) has been developed. The presented approach has numerous advantageous qualities, including utilization of readily available substrates, broad scope, scalability, and good reaction yields. Importantly, some of the benzofurans prepared by this method were heretofore inaccessible by any other known transformation.
View Article and Find Full Text PDFEffects of Thermal Treatment on DC Voltage-Driven Color Conversion in Organic Light-Emitting Diode.
Micromachines (Basel)
December 2022
Department of Electrical, Electronic and Control Engineering, AISPC Laboratory, IITC, Hankyong National University, 327 Jungang-ro, Anseong-si 17579, Republic of Korea.
A DC voltage-dependent color-tunable organic light-emitting diode (CTOLED) was proposed for lighting applications. The CTOLED consists of six consecutive organic layers: the hole injection layer, the hole transport layer (HTL), two emission layers (EMLs), a hole blocking layer (HBL), and an electron transport layer (ETL). Only one metal-free phthalocyanine (HPc) layer with a thickness of 5 nm was employed as the EML in the CTOLED on a green organic light-emitting diode (OLED) structure using tris (8-hydroxyquinoline) aluminum (III) (Alq).
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