Efficiency issues in Ce3+ doped YAG nanocrystals

Nanoparticles of Y3Al5O12:Ce3+ (YAG:Ce3+, 1%) were synthesized via the glycothermal method. The particle sizes were estimated by transmission electron microscopy, X-ray diffraction, surface area determination and by dynamic light scattering. We found primary particles of 10–14 nm in diameter, which form agglomerates of approximately 100 nm. For the 4f → 5d transition of Ce3+ an internal quantum efficacy of up to 46% was measured. The particles consist of 6–10% of 1,4-butanediol attached on the surface, as determined by carbon content measurements in combination with IR and absorption spectroscopy. In particular, limiting drawbacks due to inevitable surface coatings for glycothermal syntheses and nanoscale associated scattering are elucidated.

The organic coating inevitably obtained from glycothermal syntheses of nano YAG:Ce in 1,4-butanediol proved to be beneficial and disadvantageous at the same time. The overall efficiency of the materials is further limited due to a strong decrease of the absorbtion.Figure optionsDownload as PowerPoint slideHighlights
► Evaluation of hydrothermal nano-YAG:Ce synthesis.
► Determination of concentration and particle size dependence of optical properties.
► Analysis of surface species.
► Identification of efficiency limitations and bottlenecks.