I came across a chemiluminescent Cycles shader on BlendSwap the other day and found no similar material in Octane's LiveDB. Since the creator is offering the Cycles shader freely, I decided to create a similar material for Octane.
The original shader can be found here: http://www.blendswap.com/blends/materials/phosphorescent-shader/
Material macro can be found attached and in the LiveDB. To change the brightness, just change the power value in the blackbody emitter property.
Preview on a Blender matball is attached, rendered at 2000 pixels square, tonemapped, cropped.