TY - JOUR
T1 - Heavy atom effect on nonlinear absorption and optical limiting characteristics of 5,10,15,20-(tetratolyl) porphyrinato phosphorus (V) dichloride
AU - Prem Kiran, P.
AU - Naga Srinivas, N. K.M.
AU - Raghunath Reddy, D.
AU - Maiya, Bhaskar G.
AU - Dharmadhikari, Aditya
AU - Sandhu, Arvinder S.
AU - Ravindra Kumar, G.
AU - Narayana Rao, D.
N1 - Funding Information:
Financial support from BRNS, DRDO and CSIR is acknowledged.
PY - 2002/2/15
Y1 - 2002/2/15
N2 - Optical limiting performance and third-order nonlinearity χ(3) are investigated in 5,10,15,20-(tetratolyl) porphyrinato phosphorus (V) dichloride ([(TTP)PVCl2]+). Heavy atom effect exerted by the two axial chlorides is found to result in low fluorescence yield (∅fl), shorter lifetimes of S1, T1 and faster intersystem crossing (ISC), leading to larger excited state absorption (ESA) from T1 → Tn. This phenomenon is found to lower the limiting threshold by 30 times and increase the second hyperpolarizability by one and three orders in ps and ns time regimes, respectively.
AB - Optical limiting performance and third-order nonlinearity χ(3) are investigated in 5,10,15,20-(tetratolyl) porphyrinato phosphorus (V) dichloride ([(TTP)PVCl2]+). Heavy atom effect exerted by the two axial chlorides is found to result in low fluorescence yield (∅fl), shorter lifetimes of S1, T1 and faster intersystem crossing (ISC), leading to larger excited state absorption (ESA) from T1 → Tn. This phenomenon is found to lower the limiting threshold by 30 times and increase the second hyperpolarizability by one and three orders in ps and ns time regimes, respectively.
KW - Exicited state absorption
KW - Heavy atom effect
KW - Optical limiting
KW - Porphyrin
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U2 - 10.1016/S0030-4018(02)01112-4
DO - 10.1016/S0030-4018(02)01112-4
M3 - Article
AN - SCOPUS:0037083381
SN - 0030-4018
VL - 202
SP - 347
EP - 352
JO - Optics Communications
JF - Optics Communications
IS - 4-6
ER -