Temperature dependent polariton emission from strongly coupled organic semiconductor microcavities

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• 作者：Samira Ceccarelli ; Jakub Wenus ; Maurice S. Skolnick ; David G. Lidzey
• 关键词：Strong coupling ; Exciton ; Organic microcavities ; J-aggregates ; Absorbance ; Photoluminescence ; Reflectivity ; Temperature dependence
• 刊名：Superlattices and Microstructures
• 出版年：2007
• 出版时间：May-June 2007
• 年：2007
• 卷：41
• 期：5-6
• 页码：289-292
• 全文大小：453 K

文摘

We investigated the absorption and photoluminescence (PL) of J-aggregates of a cyanine dye both in a thin film format and when used as the active layer in a strongly-coupled microcavity. We show that as temperature is reduced, the absorption linewidth of the J-aggregates narrows and shifts to higher energy. When the J-aggregate is placed in a microcavity we find that the energy of the polariton modes also shifts to higher energies as temperature is reduced. We compare the intensity of PL emission from the upper and lower branches at resonance as a function of temperature, and find that it can be described by an activation energy of 25 meV. PL emission spectra at resonance also suggest that uncoupled excitons inside the microcavity populate the upper polariton branch states.