✦ LIBER ✦

Ultrafast optical probes of electronic excited states in linear trans-quinacridone

✍ Scribed by L. Rossi; G. Bongiovanni; J. Kalinowski; G. Lanzani; A. Mura; M. Nisoli; R. Tubino

Publisher: Elsevier Science
Year: 1996
Tongue: English
Weight: 539 KB
Volume: 257
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(96)00604-5

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✦ Synopsis

Time-resolved photoluminescence and transient photobleaching studies in the ~/-polymorph of linear trans-quinacridone (QAC) are reported. A dramatic change in the luminescence spectrum is observed with subnanosecond delays. Fluorescence excitation spectra support the hypothesis on the different origin of the time-resolved spectra. The observed spectra and temporal behaviour of excited states are reconciled by assuming the emitting states to be a mixture of neutral molecular excitons and charge-transfer states. Their role in the charge separation process is discussed in relation to electromedulation of optical response (absorption, emission) and photoconductivity in QAC.

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