Journal ArticleDOI
Ambient Room Temperature Phosphorescence and Thermally Activated Delayed Fluorescence from a Core-Substituted Pyromellitic Diimide Derivative.
Suman Kuila,Swadhin Garain,Gangadhar Banappanavar,Bidhan Chandra Garain,Dinesh Kabra,Swapan K. Pati,Subi J. George +6 more
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TLDR
In this paper, a donor core-substituted pyromellitic diimide (acceptor) derivative was reported as an efficient charge-transfer molecular design from the arylene diimides family as a triplet emitter.Abstract:
Triplet harvesting under ambient conditions plays a crucial role in improving the luminescence efficiency of purely organic molecular systems. This requires elegant molecular designs that can harvest triplets either via room temperature phosphorescence (RTP) or by thermally activated delayed fluorescence (TADF). In this context, here we report a donor core-substituted pyromellitic diimide (acceptor) derivative as an efficient charge-transfer molecular design from the arylene diimide family as a triplet emitter. Solution-processed thin films of carbazole-substituted CzPhPmDI display both RTP- and TADF-mediated twin emission with a long lifetime and high efficiency under ambient conditions. The present study not only sheds light on the fundamental photophysical process involved in the triplet harvesting of donor-acceptor organic systems, but also opens new avenues in exploring an arylene diimide class of molecules as potential organic light-emitting materials.read more
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<b>Anion−π-Induced Room Temperature Phosphorescence from Emissive Charge-Transfer States</b>
TL;DR: In this paper , an anion-π-based molecular design was proposed for the introduction of emissive singlet and triplet CT excited states, thereby expanding the functional scope of weak supramolecular interactions.
Journal ArticleDOI
Chiral Arylene Diimide Phosphors: Circularly Polarized Ambient Phosphorescence from Bischromophoric Pyromellitic Diimides.
TL;DR:
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Spin-Orbit Natural Transition Orbitals and Spin-Forbidden Transitions.
TL;DR: In this article, the authors introduce the analysis of spin-forbidden transitions with the help of complex-valued spin-orbit (SO) NTOs, specifically focusing on the components in such transitions that cause their intensity to be nonzero because of SO coupling.
Journal ArticleDOI
Progress and perspective: fluorescent to long-lived emissive multifunctional probes for intracellular sensing and imaging
TL;DR: The development of luminescent probes has gained significant interest in real-time intracellular sensing and imaging of various biologically relevant species.
Journal ArticleDOI
Ambient, tunable room temperature phosphorescence from a simple phthalimide phosphor in amorphous polymeric matrix and in crystalline state
TL;DR: In this article, a simple phthalimide phosphor derivative is reported, which exhibits visible cyan emissive phosphorescence in solution-processable thin films and orange-red emitting phosphorescence (RTP) in the crystalline state.
References
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Long-range corrected hybrid density functionals with damped atom–atom dispersion corrections
Jeng-Da Chai,Martin Head-Gordon +1 more
TL;DR: The re-optimization of a recently proposed long-range corrected hybrid density functional, omegaB97X-D, to include empirical atom-atom dispersion corrections yields satisfactory accuracy for thermochemistry, kinetics, and non-covalent interactions.
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Highly efficient organic light-emitting diodes from delayed fluorescence
Hiroki Uoyama,Kenichi Goushi,Kenichi Goushi,Katsuyuki Shizu,Hiroko Nomura,Chihaya Adachi,Chihaya Adachi +6 more
TL;DR: A class of metal-free organic electroluminescent molecules in which the energy gap between the singlet and triplet excited states is minimized by design, thereby promoting highly efficient spin up-conversion from non-radiative triplet states to radiative singlet states while maintaining high radiative decay rates.
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Natural transition orbitals
TL;DR: In this paper, a means of finding a compact orbital representation for the electronic transition density matrix is described, which utilizes the corresponding orbital transformation of Amos and Hall and allows a dramatic simplification in the qualitative description of an electronic transition.
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Time-dependent density functional theory within the Tamm–Dancoff approximation
So Hirata,Martin Head-Gordon +1 more
TL;DR: In this article, the Tamm-Dancoff approximation to time-dependent density functional theory is proposed and implemented for molecular excited states, which yields excitation energies for several closed-and open-shell molecules that are essentially of the same quality as those obtained from time dependent density functional theories itself, when the same exchange correlation functional is used.
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Recent advances in organic thermally activated delayed fluorescence materials.
Zhiyong Yang,Zhu Mao,Zongliang Xie,Yi Zhang,Siwei Liu,Juan Zhao,Jiarui Xu,Zhenguo Chi,Matthew P. Aldred +8 more
TL;DR: This review summarizes and discusses the latest progress concerning this rapidly developing research field, in which the majority of the reported TADF systems are discussed, along with their derived structure-property relationships, TadF mechanisms and applications.