Molecular photonics materials with excited-state intramolecular proton transfer (ESIPT) activity

Park, Soo Young; Kim, Sehoon

doi:10.1117/12.485821

Cited by 1 publication

(1 citation statement)

References 7 publications

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“…Subsequently, the ultrafast ESIPT process occurs and the keto form at the singlet excited state is produced, which is stabilized by the intramolecular hydrogen bond. − Moreover, due to their molecular structure, the K* species emits at a lower energy than the E* tautomer. Given the ultrafast nature of the ESIPT process (from 50 to 400 fs), − the fluorescence observed for the ESIPT chromophores is preferentially due to the K* tautomer. − Hence, two emission bands are observed and a broader range of the steady-state fluorescence can be covered, making these molecules suitable for white emitting OLEDs, , material chemistry, optical chemosensors and photonics, − among other applications. − …”

Section: Introductionmentioning

confidence: 99%

Revealing the Dynamic of Excited State Proton Transfer of a π-Conjugated Salicylidene Compound: An Experimental and Theoretical Study

et al. 2017

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Excited state intramolecular proton transfer (ESIPT) in a novel salicylidene sal-3,4-benzophen chromophore is studied by white-light femtosecond pump−probe and time-resolved fluorescence techniques, as well as by theoretical calculations under the time dependent density functional theory framework. We show that when the sal-3,4-benzophen chromophore (in enol form) is excited (at 390 nm) to the cisenol* form, it is quickly converted to the hot cis-keto* (hK*) form due to the fast ESIPT process (τ ESIPT = 150 fs). Subsequently, cooling from the hot cis-keto* (hK*) to cold cisketo* (cK*) state takes place with a characteristic time constant of ∼600 fs, with following relaxation decay time of 37 ps related with the photodynamic from sal-3,4-benzophen due to the occurrence of the cis → trans photoisomerization and intersystem crossing mechanisms. Finally, we observed the fluorescence emission from the cis-keto* at 575 nm. The dynamics of the optical process was modeled using rate equations with the proper energy level diagram and supported by theoretical calculations.

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