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Conjugation- and Aggregation-Directed Design of Covalent Organic Frameworks as White-Light-Emitting Diodes

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.0c11719· OSTI ID:1777881
 [1];  [2];  [3];  [3];  [2]
  1. Marquette Univ., Milwaukee, WI (United States). Dept. of Chemistry; Marquette University
  2. Marquette Univ., Milwaukee, WI (United States). Dept. of Chemistry
  3. Univ. of Nebraska, Lincoln, NE (United States). Dept. of Chemistry

2D covalent organic frameworks (COFs) have emerged as a promising class of organic luminescent materials due to their structural diversity, which allows the systematic tuning of organic building blocks to optimize emitting properties. However, a significant knowledge gap exists between the design strategy and the fundamental understanding of the key structural parameters that determine their photophysical properties. Here, in this work, we report two highly emissive sp2-C-COFs and the direct correlation of the structure (conjugation and aggregation) with their light absorption/emission, charge transfer (CT), and exciton dynamics, the key properties that determine their function as luminescent materials. We show that white light can be obtained by simply coating COFs on an LED strip or mixing the two COFs. Using the combination of time-resolved absorption and emission spectroscopy as well as computational prediction, we show that the planarity, conjugation, orientation of the dipole moment, and interlayer aggregation not only determine the light-harvesting ability of COFs but also control the exciton relaxation pathway and photoluminescent quantum yield.

Research Organization:
Marquette Univ., Milwaukee, WI (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0020122; AC02-06CH11357
OSTI ID:
1777881
Alternate ID(s):
OSTI ID: 2335701
Journal Information:
Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 2 Vol. 143; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

References (61)

Hyperbranched Polymers with High Transparency and Inherent High Refractive Index for Application in Organic Light-Emitting Diodes journal February 2016
Covalent Organic Frameworks: Structures, Synthesis, and Applications journal July 2018
Recent Advances in OLED Optical Design journal February 2019
A Belt-Shaped, Blue Luminescent, and Semiconducting Covalent Organic Framework journal November 2008
A Photoconductive Covalent Organic Framework: Self-Condensed Arene Cubes Composed of Eclipsed 2D Polypyrene Sheets for Photocurrent Generation journal July 2009
Covalent Organic Frameworks: Chemical Approaches to Designer Structures and Built‐In Functions journal March 2020
Vinylene‐Linked Covalent Organic Frameworks by Base‐Catalyzed Aldol Condensation journal September 2019
2D Poly(arylene vinylene) Covalent Organic Frameworks via Aldol Condensation of Trimethyltriazine journal September 2019
Aggregation‐Induced Emission: New Vistas at the Aggregate Level journal May 2020
Addressing Charge‐Transfer and Locally‐Excited States in a Twisted Biphenyl Push‐Pull Chromophore journal September 2019
Luminescent Porous Polymers Based on Aggregation-Induced Mechanism: Design, Synthesis and Functions journal October 2016
Time-dependent transition density matrix journal November 2011
Specific Two-Photon Imaging of Live Cellular and Deep-Tissue Lipid Droplets by Lipophilic AIEgens at Ultralow Concentration journal June 2018
Restriction of Molecular Rotors in Ultrathin Two-Dimensional Covalent Organic Framework Nanosheets for Sensing Signal Amplification journal November 2018
Electronic Structure of Two-Dimensional π-Conjugated Covalent Organic Frameworks journal February 2019
Aggregation-Induced Emission: Together We Shine, United We Soar! journal October 2015
Organic Optoelectronic Materials: Mechanisms and Applications journal October 2016
Expanded Theory of H- and J-Molecular Aggregates: The Effects of Vibronic Coupling and Intermolecular Charge Transfer journal April 2018
Covalent Organic Frameworks: Design, Synthesis, and Functions journal January 2020
Charge-Transfer Versus Charge-Transfer-Like Excitations Revisited journal June 2015
Spectroscopic Investigation and Theoretical Modeling of Benzothiadiazole-Based Charge-Transfer Chromophores: From Solution to Nanoaggregates journal August 2017
Non-Kasha Behavior in Quadrupolar Dye Aggregates: The Red-Shifted H-Aggregate journal January 2019
Unusual Non-Kasha Photophysical Behavior of Aggregates of Push–Pull Donor–Acceptor Chromophores journal December 2019
Ultrafast Hole Trapping and Relaxation Dynamics in p-Type CuS Nanodisks journal June 2015
Synthesis of Light-Emitting Conjugated Polymers for Applications in Electroluminescent Devices journal March 2009
Fluorescent Analogs of Biomolecular Building Blocks: Design, Properties, and Applications journal May 2010
Analysis of Excitonic and Charge Transfer Interactions from Quantum Chemical Calculations journal July 2012
On the Metric of Charge Transfer Molecular Excitations: A Simple Chemical Descriptor journal June 2013
Highly Phosphorescent Bis-Cyclometalated Iridium Complexes:  Synthesis, Photophysical Characterization, and Use in Organic Light Emitting Diodes journal May 2001
Fluorescent Detection of Chemical Warfare Agents:  Functional Group Specific Ratiometric Chemosensors journal March 2003
Multielectron Transfer in Clusters of Polar-Polarizable Chromophores journal May 2003
Tuning Orbital Energetics in Arylene Diimide Semiconductors. Materials Design for Ambient Stability of n-Type Charge Transport journal December 2007
Intra- and Intermolecular Charge Transfer in Aggregates of Tetrathiafulvalene-Triphenylmethyl Radical Derivatives in Solution journal April 2013
An Azine-Linked Covalent Organic Framework journal November 2013
One-Step Construction of Two Different Kinds of Pores in a 2D Covalent Organic Framework journal October 2014
Large Exciton Diffusion Coefficients in Two-Dimensional Covalent Organic Frameworks with Different Domain Sizes Revealed by Ultrafast Exciton Dynamics journal July 2020
Highly Emissive Covalent Organic Frameworks journal April 2016
Luminescent Covalent Organic Frameworks Containing a Homogeneous and Heterogeneous Distribution of Dehydrobenzoannulene Vertex Units journal August 2016
Synchronized Offset Stacking: A Concept for Growing Large-Domain and Highly Crystalline 2D Covalent Organic Frameworks journal December 2016
Anthracene-Resorcinol Derived Covalent Organic Framework as Flexible White Light Emitter journal September 2018
Semiconducting 2D Triazine-Cored Covalent Organic Frameworks with Unsubstituted Olefin Linkages journal August 2019
Emissive Single-Crystalline Boroxine-Linked Colloidal Covalent Organic Frameworks journal November 2019
Highly efficient organic light-emitting diodes from delayed fluorescence journal December 2012
Prospects for LED lighting journal April 2009
Tuneable near white-emissive two-dimensional covalent organic frameworks journal June 2018
Designed synthesis of stable light-emitting two-dimensional sp2 carbon-conjugated covalent organic frameworks journal October 2018
An AIEgen-based 3D covalent organic framework for white light-emitting diodes journal December 2018
Sulfone-containing covalent organic frameworks for photocatalytic hydrogen evolution from water journal October 2018
Covalent organic frameworks (COFs): from design to applications journal January 2013
Ultra-stable organic fluorophores for single-molecule research journal January 2014
Fluorescent chemosensors: the past, present and future journal January 2017
The luminescent and photophysical properties of covalent organic frameworks journal January 2020
Aggregation-induced emission of 1-methyl-1,2,3,4,5-pentaphenylsilole journal January 2001
Design of fluorescent materials for chemical sensing journal January 2007
TheoDORE: A toolbox for a detailed and automated analysis of electronic excited state computations journal February 2020
Organic electroluminescent diodes journal September 1987
Exciton analysis of many-body wave functions: Bridging the gap between the quasiparticle and molecular orbital pictures journal November 2014
Radiative lifetime of localized excitons in transition-metal dichalcogenides journal November 2018
Excimers and Exciplexes of Conjugated Polymers journal August 1994
The atom, the molecule, and the covalent organic framework journal March 2017
Energy Transfer Mechanisms and the Molecular Exciton Model for Molecular Aggregates journal September 1963