Journal ArticleDOI
The energy gap law for non-radiative decay in large molecules
Robert Englman,Joshua Jortner +1 more
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TLDR
In this article, a general theory of non-radiative intramolecular decay in large molecules is formulated using the methods of solid state physics and the harmonic approximation, and the predicted dependence of the decay rate on the energy gap Δ E between electronic origins gets characteristic forms in two limiting cases: the string electronic-vibrational coupling case (gaussian in Δ E, Arrhenius-type barrier climbing between electronic states, small isotope effect) and the weak coupling case(nearly exponential variation with Δ E, domination by the highest frequency modes and marked deuterAbout:
This article is published in Journal of Luminescence.The article was published on 1970-01-01. It has received 69 citations till now. The article focuses on the topics: Relaxation (NMR) & Kinetic isotope effect.read more
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Triplet States and Electronic Relaxation in Photoexcited Graphene Quantum Dots
TL;DR: It is shown that the photoexcited graphene quantum dots have a significant probability of relaxing into triplet states and emit both phosphorescence and fluorescence at room temperature, with relative intensities depending on the excitation energy.
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Correlation Function Approach to Radiationless Transitions
TL;DR: In this paper, the rate constant for radiationless transitions is expressed in terms of a correlation function similar to the Kubo formulas for transport coefficients, and a strong coupling theory for the interaction of the electron with the molecular vibrations is adopted to analyze the time dependent correlation function.
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Superoxide/Peroxide Chemistry Extends Charge Carriers' Lifetime but Undermines Chemical Stability of CH3NH3PbI3 Exposed to Oxygen: Time-Domain ab Initio Analysis.
TL;DR: The detailed time-domain atomistic analysis of the excited state dynamics rationalizes why the photogenerated charge carriers in perovskites are robust to defects and interactions with chemical species present in air, such as water and oxygen, even though they undermine perovkite chemical stability.
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Nonradiative Electron--Hole Recombination Rate Is Greatly Reduced by Defects in Monolayer Black Phosphorus: Ab Initio Time Domain Study.
TL;DR: The reduced electron-phonon coupling and increased bandgap in MBP-DV rationalize slower recombination in this material, suggesting that electron- phonon energy losses inMBP can be minimized by creating suitable defects in semiconductor device material.
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An Organic Host–Guest System Producing Room-Temperature Phosphorescence at the Parts-Per-Billion Level
TL;DR: In this article, a series of fluorescent naphthalimides, which did not originally show observable phosphorescence in solution, as aggregates, in polymer films, or in any other tested host material, including heavy-atom matrices at cryogenic temperatures, can now efficiently produce ultralong RTP (ϕ=0.17, τ=243 ms) in phthalimide hosts.
References
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Journal ArticleDOI
Intramolecular Radiationless Transitions
Mordechai Bixon,Joshua Jortner +1 more
TL;DR: In this paper, the authors considered a theory for intramolecular radiationless transitions in an isolated molecule and derived the validity criteria for the occurrence of an unimolecular radii-less transition and for exponential decay.
Journal ArticleDOI
Radiationless Transitions in Polyatomic Molecules. II. Triplet‐Ground‐State Transitions in Aromatic Hydrocarbons
TL;DR: In this paper, the theory of Part I is applied to nonradiative transitions from the lowest triplet state to the ground state of aromatic hydrocarbons, and a previously communicated empirical relation between triplet energy, triplet lifetime, and the relative number of hydrogen atoms per molecule is substantiated.
Journal ArticleDOI
Radiationless Transitions in Polyatomic Molecules. III. Anharmonicity, Isotope Effects, and Singlet‐to‐Ground‐State Transitions in Aromatic Hydrocarbons
W. Siebrand,D. F. Williams +1 more
TL;DR: In this paper, the authors extended and generalized the theoretical expression for Franck-Condon factors in aromatic hydrocarbons, which was derived and applied to triplet-to-ground-state transitions in Part II.
Journal ArticleDOI
Intersystem Crossing in Gaseous Molecules
TL;DR: In this paper, the theory of electronic relaxation in the solid phase is discussed in terms of gaseous molecules, and two limits are examined: the small-molecule limit (α limit) where electronic relaxation cannot occur in the free molecule, and the bigmolecules limit (ω limit), where electronic relaxations at a rate virtually identical with that of the solid can take place in the absence of any external perturbation.
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