Luminescence device and display apparatus
In a luminescence device formed of one or plural layers of organic film between a cathode and an anode, at least one layer is a luminescence layer, and a luminescence molecule of a metal coordination compound having a basic structure represented by formula (1) ML m L′ n and having a substituent on at least one of cyclic groups incorporated as a guest in a host material at a concentration of at least 8 wt. %, which is higher than a concentration at which a luminescence molecule of a similar structure but having no substituent exhibits a maximum luminescence efficiency to form the luminescence layer. As a result, a high-efficiency luminescence device is provided, which is less likely to cause concentration extinction even when a luminescence molecule is contained at a high concentration relative to the host material in the luminescence layer.
1. An organic luminescence device, comprising:
a pair of electrodes each disposed on a substrate; and
at least one luminescence layer comprising an organic compound disposed between the electrodes,
wherein the luminescence layer comprises a first organic compound and a phosphorescent second organic compound,
wherein the second organic compound is present at a concentration of at least 8 wt. % in the luminescence layer, and
wherein the second organic compound is a compound selected from the group consisting of compounds (9), (11), (29), (33), (34) and (42)-(49);
2. The organic luminescence device according to claim 1 , wherein phosphorescence is emitted from the luminescence layer by applying a voltage between the electrodes.
3. A picture display apparatus, comprising:
an organic luminescence device according to claim 1 ; and
a drive circuit for supplying display data.