{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,18]],"date-time":"2026-01-18T10:48:51Z","timestamp":1768733331593,"version":"3.49.0"},"reference-count":44,"publisher":"AIP Publishing","issue":"20","content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2001,11,22]]},"abstract":"<jats:p>Quantum yields for triplet formation have been determined for seven common \u03c0-conjugated polymers in benzene solution using time-resolved photoacoustic calorimetry (PAC) in conjunction with fluorescence quantum yields, singlet and triplet energies. The polymers studied include three poly(thiophenes), poly(2-methoxy,5-(2\u2032-ethylhexyloxy)-p-phenylenevinylene) (MEH-PPV), a cyano derivative of MEH-PPV, a ladder type poly(p-phenylene) (MeLPPP), and a poly(fluorene). Yields of singlet oxygen formation have also been determined for these polymers in benzene by time-resolved phosphorimetry, and are in reasonable agreement with triplet yields obtained by PAC. Polythiophenes show the highest intersystem crossing yields, which are suggested to result from extensive spin-orbit coupling. Where singlet oxygen yields are less than triplet yields, it is suggested that interaction of molecular oxygen with the ground state of the polymers may be involved.<\/jats:p>","DOI":"10.1063\/1.1413969","type":"journal-article","created":{"date-parts":[[2002,7,26]],"date-time":"2002-07-26T12:01:09Z","timestamp":1027684869000},"page":"9601-9606","update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":111,"title":["S\n                  1\n                \u223c&amp;gt;T\n                  1\n           intersystem crossing in \u03c0-conjugated organic polymers"],"prefix":"10.1063","volume":"115","author":[{"given":"Hugh D.","family":"Burrows","sequence":"first","affiliation":[{"name":"Departamento de Qu\u0131\u0301mica, Universidade de Coimbra, 3004-535\u2009Coimbra, Portugal"}]},{"given":"J.","family":"Seixas de Melo","sequence":"additional","affiliation":[{"name":"Departamento de Qu\u0131\u0301mica, Universidade de Coimbra, 3004-535\u2009Coimbra, Portugal"}]},{"given":"C.","family":"Serpa","sequence":"additional","affiliation":[{"name":"Departamento de Qu\u0131\u0301mica, Universidade de Coimbra, 3004-535\u2009Coimbra, Portugal"}]},{"given":"L. 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