Abstract: An organic light emitting device contains a cathode, an anode, and has located there-between a light emitting layer, comprising co-hosts including a hole transporting compound and a particular aluminum chelate, together with at least one light emitting Iridium compound, wherein the Iridium compound is a tris C^N-cyclometallated complex with a triplet energy less than or equal to the triplet energy of each of the co-hosts.

Abstract: An OLED device contains a layer comprising a hole transporting compound, a certain type of oxinoid compound, and a light emitting phosphorescent compound.

Abstract: A rectangular cavity is provided in an actuator lever intersecting with an upper edge of a shaft-receiving hole in the lever and receives a linearly slidable hard metal rectangular key having a cam on one edge for clamping the lever to the shaft. A screw engages threads on the key and is slidable with the key to a position where a distal end of the key is flush with or projects from a side surface of the lever, at which position the cam is free of the shaft-receiving opening, the key providing visual indication that the lever assembly may be positioned over the shaft without interference.