Standards for Photoluminescence Quantum Yield Measurements in Solution (IUPAC Technical Report) (Report‪)‬

1. INTRODUCTION For any photoluminescent species, the quantum yield (QY) of its luminescence is a basic property, and its measurement is an important step in the characterization of the species. According to the definition of the QY [1], only two quantities need to be known, viz. the number of photons absorbed and the number of photons emitted per unit of time. Unfortunately, reliable measurements of these quantities can be hard to obtain. In this paper, we consider the easiest situation, namely, for species in dilute solution. In this case, it is customary to measure the fluorescence spectrum and compare its integrated intensity with the same quantity for a reference system with a known QY. This measurement can be done using standard absorption and emission spectrometers [2].