The present invention relates to organic light emitting devices, and more specifically to phosphorescent organic materials used in such devices. Guidance may be provided to a current user of an application in a particular situation based on actions performed by previous users in compatible situations. The door handle assembly also comprises a bolt moveable from a first bolt position where at least a portion of the bolt is inside a wall aperture, thereby engaging the door into the wall aperture, to a second bolt position where the portion of the bolt is outside the wall aperture, thereby disengaging the door from the wall aperture. The resilient member is positioned within the housing and biases the sleeve member within the housing. The electrically conductive tether is sufficiently mechanically compliant that, on deactivation of the force balancing control loops for the rectilinear axes, the proof mass falls so as to rest on the mechanical stops.