Spiro compounds and their use as electroluminescence materials

US5840217A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Donald Lupo · Frankfurt am Main, DE
• Josef Salbeck · Kelkheim, DE
• Hermann Schenk · Hofheim, DE
• Thomas Stehlin · Kriftel, DE
• Roland Stern · Wiesbaden, DE
• Arno Wolf · Hochstädt, DE

Key dates

• Filing date: Apr 5, 1995
• Grant date: Nov 24, 1998
• Expiry date: Apr 5, 2015

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10K2102/103
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Use of spiro compounds of the formula (I) ##STR1## where K.sup.1 and K.sup.2 are, independently of one another, conjugated systems, in electroluminescence devices. Preferred compounds of the formula (I) are 9,9'-spirobifluorene derivatives of the formula (II) ##STR2## where the benzo groups can be substituted independently of one another. Compounds of the formula (I) have a good solubility in customary organic solvents, improved film-forming properties and a significantly reduced tendency to crystallize. The production of electroluminescence devices is thereby made easier and their service life is increased.