{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,4]],"date-time":"2025-10-04T08:06:07Z","timestamp":1759565167665,"version":"3.41.2"},"reference-count":36,"publisher":"AIP Publishing","issue":"3","content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2009,1,21]]},"abstract":"<jats:p>Direct observation of time-resolved emission spectra (TRESs) of cadmium sulfide nanoparticles in polymer solutions was carried out with picosecond resolution using a streak camera. The TRESs were found to undergo a pronounced time-dependent Stokes shift, eventually coinciding with the steady-state photoluminescence spectra within an \u223c40 ns delay time. Moreover, \u223c90% of the shift was complete within the first 1 ns after excitation, in contrast to the fact that overall photoluminescence involves very long time constants of 10\u2013100 ns. The observed Stokes shift dynamics was very similar in CdS nanoparticles stabilized in two very different types of polymer solutions. Thus the solvent and\/or polymeric stabilizer appeared to have a minimal effect on the shift. We propose that the relaxation proceeds through an internal mechanism involving the fast decay of high-energy traps into relatively slow-decaying low-energy traps. Time-dependent photoluminescence anisotropy experiments also revealed an \u223c1 ns decay component appearing only in the higher-energy end of the photoluminescence spectrum. Because this time constant is too short to represent rotational diffusion of the nanometer-sized particles, it was associated with the rapid relaxation of the high-energy trap states.<\/jats:p>","DOI":"10.1063\/1.3058590","type":"journal-article","created":{"date-parts":[[2009,1,21]],"date-time":"2009-01-21T23:28:23Z","timestamp":1232580503000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":7,"title":["Direct observation of time-dependent photoluminescence spectral shift in CdS nanoparticles synthesized in polymer solutions"],"prefix":"10.1063","volume":"130","author":[{"given":"Debabrata","family":"Mandal","sequence":"first","affiliation":[{"name":"Visva-Bharati University 1 Department of Chemistry, , Santiniketan 731 235, India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Haruko","family":"Hosoi","sequence":"additional","affiliation":[{"name":"Toho University 2 Department of Biomolecular Science, Faculty of Science, , Miyama 2-1-1, Funabashi, Chiba 274-8510, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Uma","family":"Chatterjee","sequence":"additional","affiliation":[{"name":"Indian Association for the Cultivation of Sciences 3 Polymer Science Unit, , Kolkata 700 032, India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tahei","family":"Tahara","sequence":"additional","affiliation":[{"name":"RIKEN 4 Molecular Spectroscopy Laboratory, , Wako 351-0198, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"317","published-online":{"date-parts":[[2009,1,20]]},"reference":[{"volume-title":"Nanophotonics","year":"2004","key":"2023070319184157200_c1"},{"key":"2023070319184157200_c2","doi-asserted-by":"publisher","first-page":"13226","DOI":"10.1021\/jp9535506","volume":"100","year":"1996","journal-title":"J. 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