Layered organic film growth by substrate temperature tuning for efficiency-enhanced OLEDs

Guillaume Wantz (1) , Olivier J. Dautel (2, 3) , Robert Almairac (4) , Lionel Hirsch (1) , Françoise Serein-Spirau (2, 3) , Laurence Vignau (1) , Jean-Pierre Lère-Porte (2, 3) , Jean-Paul Parneix (1) , Joël J.E. Moreau (2, 3)

1 LPIOM - Laboratoire de physique des interactions ondes matières
2 HMM - Hétérochimie moléculaire et macromoléculaire
3 ICGM ICMMM - Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier
4 LCVN - Laboratoire des colloïdes, verres et nanomatériaux

Effects on resultant organic light-emitting device of substrate temperature during the evaporation process of a light-emitting material are reported. Light-emitting diodes are based on a novel bis-imido-phenylene vinylene (ImPV) derivative as green-emitting molecule. It is reported that the substrate temperature has a great influence on the thin film morphology. Heating the substrate results in a more ordered film. Using this technique, molecules of ImPV self-organise in an even layered film with 1.7 nm-thick molecular layers. Devices based on heated substrates exhibit higher operating voltages but enhanced quantum and luminous efficiencies.

Mots clés: OLED; Substrate temperature; Organic vacuum deposition; Imido-phenylene vinylene

Domaines: Chimie organique; Matériaux

Guillaume Wantz, Olivier J. Dautel, Robert Almairac, Lionel Hirsch, Françoise Serein-Spirau, et al.. Layered organic film growth by substrate temperature tuning for efficiency-enhanced OLEDs. Organic Electronics, 2006, 7 (1), pp.38 -45. ⟨10.1016/j.orgel.2005.11.001⟩. ⟨hal-00177819⟩