Fabrication and characterization of vertical microcavities containing a submicron particle film of 5,5′-di(4-biphenylyl)-2,2′-bithiophene

Abstract

We show the first experimental evidence that submicron particles (diameter: approximately 400 nm) using 5,5′-di(4-biphenylyl)-2,2′-bithiophene (BP2T) prepared by a miniemulsion technique are effective active media for vertical microcavities. Selected area electron diffraction patterns confirm that crystalline BP2T submicron particles are obtained. In a distributed Bragg reflector-Au microcavity with BP2T submicron particles embedded in a poly(vinyl alcohol) (PVA) matrix (thickness: ∼780 nm), gain-narrowed emissions are observed at the 0–3 emission band of BP2T above an excitation density of 107 μJ cm−2. The light amplification of 0–3 photoluminescence band obtained in the present study demonstrates that the PVA film containing the BP2T submicron particles is useful as an active medium for microcavities.