Unless you can find someone who has already created this part, you're going to have to create it yourself. It's just a fact of life that not EVERY component in the world is going to be supplied by the vendor, and you have to create your own schematic and pcb layout symbols. Your phototransistor might be in a standard package, so that you don't have to create the pcb decal from scratch.
What do you need exactly, a schematic symbol? a pcb decal? for what software? In any case, if you can't find the part you need in the library, you will need to create your own.
I joined EDABOARD earlier, but using it now. I am not much aware, so did this mistake.
Most of the time, I use elance, guru, freelancer etc, and very much use to of offering services. Next time, I will be careful about it. I apologies for violating the rules.