On the interpretation of iso-emissive points

Al-Wattar, Abbas J. H.; Lumb, M. D.

doi:10.1016/0009-2614(71)80056-8

Cited by 18 publications

(2 citation statements)

References 6 publications

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“…A distinct isoemissive point is present at 415 nm, which indicates that there are only two emitting species present, i.e., chrysene monomer and excimer. 72 The temperature-dependent uorescence spectra of duplex 8*9 (Fig. 6B) show a behaviour that differs in one major way from hybrid 6*7: as the temperature is increased from 20 C and the strands begin to dissociate, the excimer uorescence band also gradually becomes less intense and blue shied until $70 C (the approximate T m , see Table 2) is reached.…”

Section: Uv-vis Absorption and Uorescence Spectramentioning

confidence: 97%

Observation of the rare chrysene excimer

et al. 2014

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Section: Uv-vis Absorption and Uorescence Spectramentioning

confidence: 97%

Observation of the rare chrysene excimer

et al. 2014

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“…1 In the case of intersecting fluorescence spectra, the crossing points are referred to as isoemissive points. 2,3 When encountered, isoemissive points are evidence for the presence of two and only two coexisting emitting components within the system under investigation. 4,5 However, as we show in this work, isoemissive points are surprisingly also observed in a quaternary system of light-emitting species existing in transition metal dichalcogenide monolayers, and we analyze the conditions necessary for the phenomenon to occur.…”

Section: ■ Introductionmentioning

confidence: 99%

Isoemissive Photoluminescence from a Quaternary System of Valley-Polarized, Defect-Bound Excitons and Trions in Two-Dimensional Transition Metal Dichalcogenides

et al. 2021

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Interest in the use of local band extrema, known as valleys, as a possible information carrier has in recent years been advanced by the isolation of 2D transition metal dichalcogenides (TMDCs). In some monolayer TMDCs, the structural inversion asymmetry leads to spin-valley locked states that present potential advantages for information storage and manipulation beyond existing charge- and spin-based semiconductor technologies. However, understanding of the role of defects on exciton recombination and valley scattering remains lacking and limits progress toward applications. Here, we report gate voltage-dependent polarized photoluminescence measurements on CVD-grown monolayer WS2 and MoS2 field-effect transistors and observe a quaternary system of valley polarized excitons and trions. Intriguingly, we find the spectra to exhibit isoemissive points, which were previously seen only as evidence of a binary system. We propose a rate model to explain the existence of isoemission in a quaternary system and find that the presence of isoemissive points imply a kinetic relationship between recombination and valley scattering. This relationship sheds light on the inverse relation seen between the polarization degree and photoluminescence intensity. Further consideration of the phenomenon also led to the identification of a possible new mechanism for charge carrier detrapping using the energy released from trion recombination.

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Photophysical properties of poly‐2‐phenyl‐5‐(p‐vinyl)‐phenyloxazole

McInally

Soutar

Steedman

1977

J. Polym. Sci. Polym. Chem. Ed.

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2‐Phenyl‐5‐(p‐vinyl)phenyloxazole (POS) has been synthesized. Copolymers of POS with styrene and the homopolymer poly–POS have been prepared. The polymers have been characterized through measurements of fluorescence decay times (using synchrotron radiation for excitation) and examination of excimer formation in the homopolymer. Fluorescence decay times of 0.6(±0.4) nsec and 9 (±0.2) nsec have been recorded at 298°K in toluene solution for monomer and excimer, respectively. Poly‐POS exhibits excimer formation characterized by an activation energy of 5.9(±0.5) kJ/mole and a binding energy of 17.0(±1.0) kJ/mole.

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On the interpretation of iso-emissive points

Cited by 18 publications

References 6 publications

Observation of the rare chrysene excimer

Observation of the rare chrysene excimer

Isoemissive Photoluminescence from a Quaternary System of Valley-Polarized, Defect-Bound Excitons and Trions in Two-Dimensional Transition Metal Dichalcogenides

Photophysical properties of poly‐2‐phenyl‐5‐(p‐vinyl)‐phenyloxazole

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