Effects of dipole orientation and birefringence on the optical emission from thin films

JAE Wasey, A Safonov, Ifor David William Samuel, WL Barnes

Research output: Contribution to journalArticlepeer-review

56 Citations (Scopus)

Abstract

Polymers are frequently used as the emissive material in optical devices such as the light emitting diode. The long chain molecular structure of typical polymer materials together with the spin coating technique by which thin layers are fabricated results in significant optical birefringence. We outline a classical model for spontaneous emission from within such birefringent materials in planar multi-layer structures. We compare the results obtained using this model with experimental data on the radiation pattern produced by a thin film of the conjugated polymer poly[2-methoxy, 5-(2'-ethyl-hexyloxy) 1,4 phenylenevinylene] (MEH-PPV). As a control we also measured the radiation pattern from the dye Lumogen, dispersed as a guest in an optically isotropic thin film of polycarbonate. We find that birefringence and the orientation of the dipole moment of the polymer have to be taken into account to understand the departure from the expected Lambertian radiation pattern that we observe from MEH-PPV. (C) 2000 Elsevier Science B.V. All rights reserved.

Original languageEnglish
Pages (from-to)109-121
JournalOptics Communications
Volume183
Issue number1-4
DOIs
Publication statusPublished - 1 Sept 2000

Keywords

  • thin films
  • birefringence
  • emission
  • LIGHT
  • EFFICIENCY

Fingerprint

Dive into the research topics of 'Effects of dipole orientation and birefringence on the optical emission from thin films'. Together they form a unique fingerprint.

Cite this