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Microcavity Effects in Thiophene-Based Oligomers

Published online by Cambridge University Press:  21 March 2011

G. Gigli,
M. Anni,
S. Patanè,
G. Barbarella,
L. Favaretto and
R. Cingolani
G. Gigli
Affiliation:
Istituto Nazionale Fisica della Materia (INFM), Dip. Ingegneria dell'Innovazione, Università di Lecce, Via per Arnesano, 73100 Lecce, ITALY
M. Anni
Affiliation:
Istituto Nazionale Fisica della Materia (INFM), Dip. Ingegneria dell'Innovazione, Università di Lecce, Via per Arnesano, 73100 Lecce, ITALY
S. Patanè
Affiliation:
Istituto Nazionale di Fisica della Materia (INFM), Dip. di Fisica della Materia e Tecnologie Avanzate, Universitá di Messina, ITALY
G. Barbarella
Affiliation:
Consiglio Nazionale delle Ricerche (CNR), ICOCEA, Area della Ricerca di Bologna, Via Gobetti 101, 40129 Bologna, ITALY
L. Favaretto
Affiliation:
Consiglio Nazionale delle Ricerche (CNR), ICOCEA, Area della Ricerca di Bologna, Via Gobetti 101, 40129 Bologna, ITALY
R. Cingolani
Affiliation:
Istituto Nazionale Fisica della Materia (INFM), Dip. Ingegneria dell'Innovazione, Università di Lecce, Via per Arnesano, 73100 Lecce, ITALY
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Abstract

We report on the realization and optical properties of a fully evaporated organic microcavity based on LiF-TeOx Distributed Bragg Reflectors and a substituted quinquethiophene as active material. The PL spectrum shows a strong line-width reduction, down to 10 nm, with respect to the bulk spectrum, which is about 110 nm broad. The emission at the mode wavelength shows an enhancement due to the light matter coupling in the optical resonator. The cavity mode shows a splitting for emission angles higher than about 30 degrees which continuously increases with angle up to 99 meV. This feature is observed both in angle resolved PL spectra and in angle resolved reflectance with unpolarized light. A study of angle resolved reflectance with polarized light allows us to attribute this splitting to a polarization effect, rather than to Rabi splitting due to strong coupling in the cavity.

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References

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