| 摘要 |
PROBLEM TO BE SOLVED: To obtain a light emitting element containing a specific substance between positive and negative electrodes of element emitted by electric energy, capable of providing blue coloring having high brightness even at a low voltage under low electric current voltage and useful for flat panel display apparatus, back light, etc. SOLUTION: This light emitting element contains a substance having a tropolone skeleton e.g. a chelating complex of the formula [R<1> to R<5> are each H, a halogen, OH, a 1-10C alkyl (R'), a 1-10C alkoxy(carbonyl), a 1-10C trialkylsilyloxy, a (R'-substituted)amino a 1-10C acyl, cyano, nitro, a (substituted) aromatic hydrocarbon group or a heterocyclic group, especially H; M is a center atom of aluminum, gallium, beryllium, etc.; (n) is a valence of M]} as a luminescent layer, a host material for the luminescent layer and a doping material, etc., of the luminescent layer. |
