Porphyrins

Eastwood, DeLyle; Gouterman, Martin

doi:10.1016/0022-2852(70)90179-7

Cited by 267 publications

(126 citation statements)

References 21 publications

Supporting

Mentioning

118

Contrasting

Unclassified

Order By: Relevance

“…The T 1 state is shifted from 1.94 eV ͑Table IX͒ to 1.87 eV in a good agreement with experimental data ͑shift from 2.02 to 1.93 eV͒. 33 The singlet excited states are less shifted. The PtOEP absorption spectrum in the neat thin film has a maximum of the Soret band at 372 nm and two Q bands at 510 nm ͑QЈ͒.…”

Section: B Excited States Of Metalloporphyrins and Absorption Spectrsupporting

confidence: 84%

“…25,26 Phosphorescence of platinum porphyrins in low temperature solids 33,34 results from vibronic transitions where an excitation of vibrational modes occurs simultaneously with the electronic T 1 -S 0 transition. This vibronic fine structure contains information not only about the frequencies of the vibrational modes but also about SOC perturbations of three spin sublevels of the T 1 M S state and about their dependence on vibrational movement.…”

Section: ͑8͒mentioning

confidence: 99%

“…17 Under the PtP excitation no detectable fluorescence was observed. 2,33 Thus a proper analysis of phosphorescence should address the singlet excited states. Results of the present calculations of the low-lying excited states and the S-S absorption spectrum of metal porphyrins are presented in Table I.…”

Section: B Excited States Of Metalloporphyrins and Absorption Spectrmentioning

confidence: 99%

“…It is known 33 that the luminescent properties of porphyrins are far more dependent on metal substitution than are the absorption spectra. The above mentioned CT states are not seen in the absorption since the corresponding transitions from the ground state are electric dipole forbidden.…”

Section: Phosphorescencementioning

confidence: 99%

“…17,34,64,65 The first analysis of the problem was presented by Gouterman and co-workers. 17,33,59,65 They pointed out that the ZFS of the six components of the 3 E u state should represent the importance of SOC relative to the lifting of the orbital degeneracy by the Jahn-Teller effect and by intermolecular interaction with the environment. From magneto-optical experiments on the lower singlet 1 E u states of ZnP and PdP, we know that the crystal field lifts the orbital degeneracy and induces a splitting.…”

Section: Phosphorescencementioning

confidence: 99%

See 4 more Smart Citations

Theoretical study of phosphorescence in dye doped light emitting diodes

Minaev

Jansson

Ågren

et al. 2006

The Journal of Chemical Physics

View full text Add to dashboard Cite

Phosphorescence of platinum͑II͒ octaethyl porphyrin ͑PtOEP͒, which has been used in organic light emitting diodes to overcome the efficiency limit imposed by the formation of triplet excitons, is studied by time-dependent ͑TD͒ density functional theory ͑DFT͒. The spin-orbit coupling ͑SOC͒ effects and the phosphorescence radiative lifetime ͑ p r ͒, calculated by the TD DFT method with the quadratic response technique, are analyzed for a series of porphyrins in order to elucidate the internal heavy atom effect on p r . While the significance of the d orbital admixture into the lowest unoccupied molecular orbital e g ͑ * ͒, proposed by Gouterman et al. ͓J. Chem. Phys. 56, 4073 ͑1972͔͒, is supported by our SOC calculations, we find that the charge-transfer ͑CT͒ mechanism is more important; the CT state of the 3 A 2g symmetry provides effective SOC mixing with the ground state, and a large 3 A 2g -3 E u transition dipole moment gives the main contribution to the radiative phosphorescence rate constant. The IR and Raman spectra in the ground state and first excited triplet state ͑T 1 ͒ are studied for proper assignment of vibronic patterns. An orbital angular momentum of the T 1 state is not quenched completely by the Jahn-Teller effect. A large zero-field splitting is predicted for PtP and PtOEP which results from a competition between the SOC and Jahn-Teller effects. A strong vibronic activity is found for the e g mode at 230 cm −1 in PtP phosphorescence which is shifted to 260 cm −1 in PtOEP. This out-of-plane vibration of the Pt atom produces considerable change of the SOC mixing. The role of charge-transfer state of d * type is stressed for the explanation of the electroluminescent properties of the dye doped light emitting diode.

show abstract

Section: B Excited States Of Metalloporphyrins and Absorption Spectrsupporting

confidence: 84%

Section: ͑8͒mentioning

confidence: 99%

Section: B Excited States Of Metalloporphyrins and Absorption Spectrmentioning

confidence: 99%

Section: Phosphorescencementioning

confidence: 99%

Section: Phosphorescencementioning

confidence: 99%

See 3 more Smart Citations

Theoretical study of phosphorescence in dye doped light emitting diodes

Minaev

Jansson

Ågren

et al. 2006

The Journal of Chemical Physics

View full text Add to dashboard Cite

show abstract

Evaluation of a time-resolved fluorescence microscope using a phosphorescent Pt-porphine model system

et al. 1996

View full text Add to dashboard Cite

Novel optical oxygen sensing by phosphorescence quenching of palladium porphyrin self-assembled film on alumina plate

Amao¹,

Asai²,

Okura

2000

J. Porphyrins Phthalocyanines

View full text Add to dashboard Cite

An optical oxygen sensor based on the phosphorescence quenching of palladium tetrakis(4-carboxyphenyl)porphyrin (PdTCPP) self-assembled film (SAM) on alumina plate was developed. The phosphorescence intensity of PdTCPP film decreased with increasing oxygen pressure, indicating that the film can be used as an optical oxygen-sensing device based on phosphorescence quenching by oxygen. The ratio I0/I100 as a sensitivity measure of the sensing film is estimated to be 17.7, showing that the film is a highly sensitive device for oxygen pressure. The film obeyed Stern–Volmer plots with a multisite model and possessed good operational stability and a fast response. Response times are 36 s for deoxygenated to oxygenated conditions and 148 s for the reverse conditions.

show abstract

Porphyrins

Cited by 267 publications

References 21 publications

Theoretical study of phosphorescence in dye doped light emitting diodes

Theoretical study of phosphorescence in dye doped light emitting diodes

Evaluation of a time-resolved fluorescence microscope using a phosphorescent Pt-porphine model system

Novel optical oxygen sensing by phosphorescence quenching of palladium porphyrin self-assembled film on alumina plate

Contact Info

Product

Resources

About