Controlled emission and coupling of small-size YAG:Ce3+ nanocrystals to gold nanowire

TL;DR

This paper demonstrates controlled emission enhancement of small YAG:Ce3+ nanocrystals coupled with gold nanowires, achieving significant emission rate improvements for potential nanoscale light sources.

Contribution

It introduces a method to enhance emission rates of tiny YAG:Ce3+ nanocrystals via coupling with gold nanowires, supported by experimental and theoretical analysis.

Findings

Emission intensity doubles near gold nanowires.

Maximum 3.8-fold emission rate enhancement observed.

Small nanocrystals are more efficient for emission enhancement.

Abstract

We report a controlled emission of Ce3+ ions inside single Yttrium Aluminum Gar- net Y3Al5O12 (YAG:Ce3+) nanocrystals with a diameter of 22 +- 10 nm as a result of a coupling of a surface plasmon mode propagating along single gold nanowire (NW). From the PL images, the intensity for single YAG:Ce3+ nanocrystals in the proximity of the single gold NW increases by a factor of two in comparison with that without the NW. Also, we observe a maximum of 3.8-fold emission rate en- hancements for the single nanocrystal close to the single gold NW. The emission rate enhancements of YAG:Ce3+ nanocrystals are two folds the enhancements of 100-nm fluorescent nanospheres. This value is in agreement with the calculation of a combi- nation from the analytical scattering model and boundary element method (BEM). We also confirm that the small size light sources are more efficient for the emission rate enhancements. Thus, the controlled emission of small YAG:Ce3+ nanocrystals with the perfect photostabilities will pave the way for the ultimate efficient nanoscale light sources.