TECHNOLOGY FOCUS - ELECTRONICS - Preferred Components: At least one organic thin layer includes at least one emission layer, hole transport layer (HTL), hole injection layer (HIL), electron transport layer (ETL), electron injection layer (EIL), or hole blocking layer (preferably electron transport layer (ETL), electron injection layer (EIL) or emission layer). The compound (I) or (II) is included in the electron transport layer (ETL), electron injection layer (EIL), or emission layer (preferably emission layer).    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation: No general method for the preparation of (I) or (II) is given. Preferred Definitions:    Ar1=naphthyl, naphthylphenyl, phenanthrenyl, anthracenyl or pyrenyl (all optionally substituted);    Ar2=quinolinyl (optionally substituted);    L1 and L2=phenylene, biphenylene or naphthylene (all optionally substituted);and    Ar3=phenyl, biphenyl, naphthyl, naphthylphenyl, phenanthrenyl, anthracenyl or pyrenyl (all optionally substituted).    L1 or L2 is linked to Ar2 or Ar4 at a number 4 or 8 position of the optionally substituted quinolinyl group.    SPECIFIC COMPOUNDS - 48 Compounds are specifically claimed as (I) or (II) e.g. 3-(4-(4,6-di-naphthalen-2-yl-(1,3,5)triazin-2-yl)-phenyl)-quinoline (IA), 1-(4-(4,6-diphenyl-(1,3,5)triazin-2-yl)-phenyl)-isoquinoline, 1-(4-(4,6-di-naphthalen-1-yl-(1,3,5)triazin-2-yl)-phenyl)-isoquinoline, 1-(4-(4,6-di-phenanthren-9-yl-(1,3,5)triazin-2-yl)-phenyl)-isoquinoline, and 1-(4-(4,6-bis-biphenyl-4-yl-(1,3,5)triazin-2-yl)-phenyl)-isoquinoline.    EXAMPLE - 2-Chloro-4,6-di-naphthalen-2-yl-(1,3,5)triazine (5.1 g), (4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)quinoline (5.0 g) and tetrakis (triphenylphosphine)palladium (0.39 g) were suspended in a mixed solvent of tetrahydrofuran (150 ml) and toluene (100 ml) to prepare a suspension. Potassium carbonate (3.8 g) was dissolved in water (100 ml) to prepare a solution. The resulting solution was added to the suspension, and the mixture was refluxed for 24 hours while heating. After work-up, 3-(4-(4,6-di-naphthalen-2-yl-(1,3,5)triazin-2-yl)-phenyl)-quinoline (5.4 g, 71.8% yield) was obtained.