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In the anti-Stokes excitation of trivalent rare-earth ions (RE3+), theexcitation photons energy is smaller than that of a given absorptiontransition, and the energy mismatch can be compensated by phonons annihilationfrom the host lattice. Since the phonon occupation number increases withtemperature, heating the system generally increases the efficiency ofanti-Stokes excitation. Here, we exploited the intrinsic heating associatedwith light-to-heat conversion in the interaction of excitation laser light withmetallic nanoparticles (Ag or Au) on the surface of submicrometric particles ofNdxY1.00-xAl3(BO3)4 (x = 0.10, 0.20, and 1.00) in order to enhance theefficiency of the anti-Stokes excitation at 1064 nm. Several upconversionemissions are observed from 600 nm to 880 nm, the most intense being at 750 nmdue to the Nd3+ transition {4F7/2, 4S3/2} - 4I9/2. Giant enhancements aredemonstrated, when compared to undecorated NdxY1.00-xAl3(BO3)4 particles. Thepresent results can be expanded to other luminescent materials as well asexcitation wavelengths.

Metallic nanoparticles-decorated NdxY1-xAl3(BO3)4 sub-micrometric particles to enhance anti-Stokes excitation performance