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Photoluminescence decay time studies on ZnS in cubic and hexagonal phase and its mechanico‐chemical interaction with polyaniline
Author(s) -
Scocioreanu Malvina,
Mihut Lucian,
Baibarac Mihaela,
Baltog Ioan
Publication year - 2013
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201248234
Subject(s) - photoluminescence , wurtzite crystal structure , materials science , polyaniline , excitation , hexagonal phase , nanosecond , phase (matter) , photoluminescence excitation , optoelectronics , composite number , analytical chemistry (journal) , optics , composite material , chemistry , laser , physics , zinc , organic chemistry , quantum mechanics , metallurgy , polymerization , polymer
We report new photoluminescence (PL) data generated by pulsed optical excitation on the composites achieved by a mechanico‐chemical reaction between ZnS in the cubic (c) and wurtzite (w) phases and polyaniline‐emeraldine base (PANI‐EB). Under continuous and pulsed optical excitation, powders of the (w)ZnS and (w)ZnS/PANI‐EB composites display PL with different spectral compositions. Contrary to expectations, the (c)ZnS and the (c)ZnS/PANI‐EB composite displayed weak PL and decay time in the range of nanoseconds. This results from the great involvement of the surface states in nanometric powders which creates efficient channels for the non‐radiative recombination of the carriers.PL spectra of (w)ZnS/PANI‐EB under continous (a) and pulsed optical excitation (b).