Nonlinear absorption and optical limiting IN metalloporphyrins

Mishra, S. R.; Rawat, H. S.; Laghate, M

doi:10.1016/s0030-4018(97)00614-7

Cited by 45 publications

(24 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[7] Together with C 60 and its derivatives, metallophthalocyanines and metalloporphyrins are amongst the most effective OPL materials, in which the heavy-metal effect facilitates the spin-orbit coupling (SOC) and significantly magnifies the OPL response by enhancement of the intersystem crossing (ISC) from the first singlet state (S 1 ) to the first triplet state (T 1 ), thereby giving a good access to the highly absorbing triplet-state manifold. [21][22][23][24][25][26] Despite their outstanding OPL performance, the deep colors of fullerenes, phthalocyanines and porphyrins caused by their largely p-conjugated structures would pose severe limitations on their use in practical devices, especially for the protection of human eyes, since there are always inevitable absorption bands in the visible-light spectral region (400-700 nm). [6a,27] In other words, these materials with good optical nonlinearity usually only exhibit poor optical transparency, and it is common that a bathochromic shift of the ground state (S 0 ) absorption maximum (l max ) would generally increase the thirdorder NLO effect.…”

Section: Introductionmentioning

confidence: 99%

Symmetric Versus Unsymmetric Platinum(II) Bis(aryleneethynylene)s with Distinct Electronic Structures for Optical Power Limiting/Optical Transparency Trade‐off Optimization

Zhou

Wong

Poon

et al. 2009

Adv Funct Materials

134

View full text Add to dashboard Cite

A new series of symmetric and unsymmetric Pt(II) bis(acetylide) complexes of the type DC≡CPt(PBu3)2C≡CD (DPtD), AC≡CPt(PBu3)2C≡CA (APtA) and DC≡CPt(PBu3)2C≡CA (DPtA) (D, donor groups; A, acceptor groups) are synthesized, and show superior optical power limiting (OPL)/optical transparency trade‐offs. By tailoring the electronic properties of the aryleneethynylene group, distinct electronic structures for these metalated complexes can be obtained, which significantly affect their photophysical behavior and OPL properties for a nanosecond laser pulse at 532 nm. Electronic influence of the ligand type and the molecular symmetry of metal group on the optical transparency/nonlinearity optimization is thoroughly elucidated. Generally, aryleneethynylene ligands with π electron‐accepting nature will effectively enhance the harvesting efficiency of the triplet excited states. The ligand variation to the OPL strength of these Pt(II) compounds follows the order: DPtD > DPtA > APtA. These results could be attributed to the distinctive excited state character induced by their different electronic structures, on the basis of the data from both photophysical studies and theoretical calculations. All of the complexes show very good optical transparencies in the visible‐light region and exhibit excellent OPL responses with very impressive figure of merit σex/σo values (up to 17), which remarkably outweigh those of state‐of‐the‐art reverse saturable absorption dyes such as C60 and metallophthalocyanines with very poor transparencies. Their lower optical‐limiting thresholds (0.05 J cm−2 at 92% linear transmittance) compared with that of the best materials (ca. 0.07 J cm−2 for InPc and PbPc dyes) currently in use will render these highly transparent materials promising candidates for practical OPL devices for the protection of human eyes and other delicate electro‐optic sensors.

show abstract

Section: Introductionmentioning

confidence: 99%

Symmetric Versus Unsymmetric Platinum(II) Bis(aryleneethynylene)s with Distinct Electronic Structures for Optical Power Limiting/Optical Transparency Trade‐off Optimization

Zhou

Wong

Poon

et al. 2009

Adv Funct Materials

134

View full text Add to dashboard Cite

show abstract

“…22 The increase in RSA performance caused by introducing Zn 2+ in the porphyrin ring was expected and has already been reported for other porphyrins. 4,5,11 This enhancement is attributed to the well known heavy atom effect. [23][24][25] Adding heavy atoms to the porphyrin structure enhances the spin-orbit coupling, increasing the intersystem crossing rate.…”

Section: Resultsmentioning

confidence: 97%

“…This can be accomplished by changing their central ion, 5 adding groups to outlying positions 6,7 or adding axial ligands to ions at the central part of the ring. 8 Porphyrins are aromatic macrocyclics, formed by four pyrrole rings connected by unsaturated methylene bridges.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Reverse saturable absorption in 5,10,15,20-Tetra(4-pyridyl)-21H,23H-porphyrin with ruthenium outlying complexes

Neto¹,

Oliveira²,

Guedes³

et al. 2006

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

Modificações no sinal de absorção de estado excitado da 5,10,15,20-tetra(4-piridil)-21H,23H-porfirina, provocadas tanto pela substituição do íon central quanto pela adição de grupos periféricos, são investigadas empregando-se pulsos laser de 5 ns com 532 nm, juntamente com medidas de absorção linear e tempo de decaimento da fluorescência. A absorção saturada reversa (RSA) aumenta consideravelmente quando os íons H + são substituídos pelo Zn 2+ na posição central do anel porfirínico. Contudo, esta diminui quando os grupos RuCl 2 (CO)(PPh 3 ) 2 e RuCl 2 (CO)(dppb) são ligados através dos anéis piridínicos às posições periféricas da porfirina, tanto para a base livre quanto para a zinco porfirina. Um modelo teórico baseado no diagrama de Jablonski foi usado para verificar qual a principal causa da diminuição do sinal de RSA provocada pelos grupos de rutênio.Investigations on the excited state absorption signal of 5,10,15,20-tetra(4-pyridyl)-21H,23H-porphyrin, modified by either changing the central ion or adding peripheral groups, were performed using 5 ns laser pulses at 532 nm, in association with linear absorbance and fluorescence decay time measurements. The reverse saturable absorption (RSA) increases remarkably when Zn 2+ replaces H + at the central position of the porphyrin ring. However, it decreases when RuCl 2 (CO)(PPh 3 ) 2 and RuCl 2 (CO)(dppb) groups are attached at outlying positions through the pyridine rings, for both the free base and zinc porphyrins. A theoretical model based on Jablonski diagram was used to verify the main reason for the decrease on the RSA signal caused by ruthenium groups.

show abstract

“…5, which is a general model to describe excited-state absorption of porphyrins [4,20,48,49]. Under illumination an initial photon of 532 nm is absorbed and promotes the electrons from S 0 to the first excited singlet state S 1 .…”

Section: Model Interpretationmentioning

confidence: 99%

Modulation of internal conversion rate and nonlinear absorption in meso-tetraphenylporphyrins by donor/acceptor substitutes

Qian

Xiao

et al. 2015

Optical Materials

View full text Add to dashboard Cite

Nonlinear absorption and optical limiting IN metalloporphyrins

Cited by 45 publications

References 20 publications

Symmetric Versus Unsymmetric Platinum(II) Bis(aryleneethynylene)s with Distinct Electronic Structures for Optical Power Limiting/Optical Transparency Trade‐off Optimization

Symmetric Versus Unsymmetric Platinum(II) Bis(aryleneethynylene)s with Distinct Electronic Structures for Optical Power Limiting/Optical Transparency Trade‐off Optimization

Reverse saturable absorption in 5,10,15,20-Tetra(4-pyridyl)-21H,23H-porphyrin with ruthenium outlying complexes

Modulation of internal conversion rate and nonlinear absorption in meso-tetraphenylporphyrins by donor/acceptor substitutes

Contact Info

Product

Resources

About