Well, this is very promising, with my homemade spectrometer Plab v2.5, I was able to actually (and accurately,) measure the relative quantum yield of Rhodamine B in Ethanol. My Reference stock solution of Rhodamine B had a quantum yield of 68.5 and two other samples hit it right on the mark with 70.1 and 70.8 percent!

All for under a hundred dollars :)-

Here are a couple of plots to show what I'm taking about, the rest of my research can be found here: http://publiclab.org/notes/dhaffnersr/07-12-2016/quantum-yield-of-rhodamine-b-in-ethanol-gain-corrected-spectra