Due to its high quantum efficiency (QE) for luminescence, conventional coarse-grained YAG:Ce finds widespread use in light conversion and scintillator applications. Preparing YAG:Ce in nanocrystalline form may impart modified optical properties of advantage to technological applications, but the latter depend on highly efficient energy conversion. In this work, the effect of the particle size on quantum efficiency as well as on the optical lifetime of the YAG:Ce emission will be characterized and discussed.

Comparing the nanocrystalline samples to a coarse-grained reference sample, we find a significant influence of the particle size on quantum efficiency. It turns out that the investigated nanocrystalline samples exhibit a lower QE at ambient temperature than the coarse-grained reference. The results of the optical lifetime measurements are discussed in relation to this reduction in QE.

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