Determining Fluorescence Quantum Yield of C60 in Toluene For my experiment, I am trying to determine the fluorescence quantum yield of C60-fullerene in toluene (at room temperature).  In order to do that, I need to have a standard sample with a valid and known fluorescence quantum yield. I have been looking for a standard sample with a known quantum yield in toluene, however, I am not sure of what to use. 

Would it be better if I used a different solvent in determining the quantum yield and if so what solvent and standard should I use.
Toluene instead of benzene can be a poor choice when H-atom abstraction by the excited state is possible. Here, you're safe.

Try to get a copy of Fluorescence spectra and quantum yields of buckminsterfullerene (C60) in room-temperature solutions. No excitation wavelength dependence.

The authors apparently used 9-cyanoanthracene in toluene as a standard to determine $\Phi_f$ of C60.

You might also want to have a look for review articles by Dirk Guldi from the time around 2000; I remember him giving a number of talks on C60 around that time.